Special issue: Recent advances in Cambrian to modern cephalopod research I
Lissajousibelus nov. gen., an Early Jurassic canaliculate belemnite from Normandy, France
Swiss Journal of Palaeontology volume 134, pages 289–300 (2015)
Belemnites harleyi Mayer, 1866, originally described from the Jurassic of Normandy, has encountered diverging interpretations during the last 150 years of scientific research. It has subsequently been assigned to four different genera (Belemnopsis, Aulacoteuthis, Acrocoelites and Holcobelus). The detailed study of the rostrum morphology and its inner structure allows us to attribute it to a new genus, Lissajousibelus Weis gen. nov., in honour of the French geologist Marcel Lissajous (1863–1921). Key features of the new genus are the overall depressed rostrum, short dorsolateral apical grooves, a long intermediate ventral groove with splitting surface, and a shallow dorsoalveolar depression. Bed-by-bed sampling at the classic locality Feuguerolles-sur-Orne (Calvados) enables us to revise the stratigraphic position of Lissajousibelus harleyi (Mayer, in J de Conchyl 3:358–369, 1866) as lowermost Toarcian Tenuicostatum Chronozone. Lissajousibelus Weis gen. nov. is therefore amongst the earliest belemnites with belemnopseine morphology. However, its phylogenetic relationships with younger Belemnopseina from the Aalenian–Bajocian (Middle Jurassic) remain unclear.
In 1853, Harlé reported a canaliculate belemnite (“Belemnites canaliculatus Schlotheim, 1820”) from marl beds intercalated between the “Banc de roc” (upper Pliensbachian) and the “Argiles à poissons” (lower Toarcian) of the French Calvados department (Normandy). Mayer (1866) recognized it as a distinct taxon and described it as Belemnites harleyi n. sp. Later, in his monumental monograph on the Jurassic fossils of Normandy, Eudes-Deslongchamps (1878) reported the same form under the name Belemnites canaliculatus, stating that it had been encountered exclusively in the “Couches à Ammonites Murchisonae” (upper Aalenian according to modern stratigraphic standards). Lissajous (1915) referred it first to the genus Belemnopsis and later (Lissajous 1927) to Aulacoteuthis, and indicated a stratigraphic distribution ranging from upper Pliensbachian to Toarcian. Later, Doyle (1994) considered it as the earliest representative of Acrocoelites. More recently, Riegraf (1995), Riegraf et al. (1998), and Weis et al. (2012) tentatively attributed it to the Aalenian–Bajocian genus Holcobelus, expressing some doubt on its stratigraphic position and emphasizing also the characteristic depression of the rostrum (Weis et al. 2012, p. 23). As the aforementioned authors based their study on the limited available material from historical collections of the nineteenth century, with poor stratigraphic and geographic information, the systematic status of the species remained with some doubts. The present paper benefits from recent bed-by-bed sampling by one of us (MC) at the former Guérin quarry of Feuguerolles-sur-Orne (Calvados), a locality already mentioned by Eudes-Deslongchamps (1878). It is now possible to give precise information on the stratigraphic position of “Belemnites harleyi” and to provide a more detailed study of its peculiar morphological features, allowing us to establish a new, monospecific genus Lissajousibelus Weis gen. nov. for this taxon. The systematic results constitute the basis for discussing the palaeobiogeographical distribution and the morphological affinities of Lissajousibelus harleyi (Mayer 1866).
Material and Geological setting
The studied material is composed of 69 belemnite rostra sampled bed-by-bed in the Guérin quarry at Feuguerolles-sur-Orne. All figured and measured specimens from this set are stored at the Musée d’histoire naturelle, Le Mans, France (MHNLM), additional specimens are stored in the private collection of M. Chesnier. Further material was studied from the historical “École des Mines de Paris” collection, now stored at University Claude Bernard, Lyon-Villeurbanne, France (UCBL), the collection of the Musée d’histoire naturelle, Le Mans, France (MHNLM) and the “Pellat” collection, stored at the National Museum for Natural History, Luxembourg (MNHNL). Scanning Electron Microscope (Jeol-Neoscope JCM-5000) has been used to observe phragmocone details. Illustrated rostra are all in natural size (unless otherwise indicated by scale bars) and have been coated with magnesium oxide before photographing.
The section at Feuguerolles-sur-Orne (Calvados, France)
The Guérin quarry is situated at 500 m north of the village of Feuguerolles-sur-Orne, ca. 6 km south of the town of Caen (Fig. 1b). It has been exploited for Palaeozoic limestone, underlying the Jurassic covering. The Silurian basement in the study area consists of a palaeo-escarpment (“Synclinal de May-sur-Orne”) with numerous small-scaled depressions that have been filled up by Jurassic deposits. The palaeogeographical position of the synclinal de May-sur-Orne during the Early Jurassic was close to the northeastern margin of the Armorican Massif landmass (Fig. 1a), in the western part of the Anglo-Paris Basin. Palaeontological, stratigraphical and palaeoenvironmental aspects of the Feuguerolles-sur-Orne section have been studied by several authors (e.g. Rioult 1968; Dugué et al. 1998; Vernhet et al. 2002).
Although comprising sediments that are strongly reduced in thickness, the section allows us to establish a well-constrained stratigraphical scale based on ammonites, following the chronozone concept introduced by Page (2003); it covers parts of the Lower and Middle Jurassic (lower Pliensbachian to lower Bajocian). Our study focused on the upper Pliensbachian (“Domerian”) and the lower Toarcian beds. The most complete section out of 20 field-logs is chosen herein as the representative section (Fig. 1c). The Pliensbachian sediments overly the Palaeozoic basement, with a thickness of ca. 1.7 m; the upper part of the Pliensbachian beds has been dated by a single specimen of Amaltheus sp., found in situ 30 cm below the base of bed T1a. This occurrence indicates the Margaritatus Chronozone or the Apyrenum Subchronozone of the Spinatum Chronozone. Concerning the Toarcian deposits, the Semicelatum Zonule, Semicelatum Subchronozone, Tenuicostatum Chronozone has been identified (beds T1a–c). Bed T1a is a 0.04–0.06-m-thick layer of sandy, fossiliferous marls. It contains bivalve and brachiopod shells (Thecideida indet. and Koninckella liasiana Bouchard in Davidson and Morris 1847), echinoderms, fish teeth, numerous belemnites and a single ammonite specimen Dactylioceras semicelatum (Simpson 1843). The calcareous layer T1b, with a thickness of 0.10–0.14 m, contains the same dactylioceratid ammonite fauna. Bed T1c corresponds to sandy marls, similar to T1a, with a similar fossil assemblage but more numerous Dactylioceras semicelatum. It is followed by 0.2-m-thick greyish marls, dated from the Serpentinum Chronozone, Elegantulum Subchronozone, with numerous belemnites at the base. The very thin layer between T1c and T2 (“Couche à Koninckella” of local authors) contains numerous fossils, e.g. belemnites and the brachiopod Koninckella davidsoni (Eudes-Deslongchamps 1853); no ammonites have been found in this T1c/T2 boundary bed at Feuguerolles-sur-Orne, but the age of the “Couche à Koninckella” in Normandy is given as Tenuicostatum Chronozone (Rioult 1980). Records of Lissajousibelus harleyi are mainly distributed in beds T1a–c, a few records come from the transition bed T1c/2a and the base of T2. The distribution of coeval belemnite taxa (passaloteuthids, megateuthidids and salpingoteuthidids) will be investigated in a separate paper.
Terminology follows Doyle and Kelly (1988) and Weis et al. (2012). Symbols (*; v; cf.; ?) are used according to the recommendations of Matthews (1973). Measurements: L, total preserved length; X, length from apex to protoconch (length of the rostrum solidum); Dv, dorso-ventral diameter at alveolar opening; Dl, lateral diameter at alveolar opening; Ie, elongation index, ratio between dorsal and ventral diameter at alveolar opening and length from apex to protoconch (Dv/X); Ic, compression index, ratio between dorsal and ventral diameter and lateral diameter, calculated at the level of the alveolar opening: values of >1 indicate a compressed rostrum, values of <1 indicate a depressed rostrum; Ls, length of the splitting surface; A, alveolar angle.
Subclass Coleoidea Bather, 1888
Order Belemnitida Zittel, 1895
Suborder ?Belemnopseina Jeletzky, 1965
Family uncertain (?Holcobelidae)
Genus Lissajousibelus Weis nov. gen.
Type species Belemnites harleyi Mayer 1866
Derivatio nominis In honour of the French geologist Marcel Lissajous (1863–1921), who was the first to recognize the outstanding systematic position of “Belemnites harleyi”.
Diagnosis Small to medium sized, conical rostrum. Outline symmetrical, conical to cylindroconical. Profile slightly asymmetrical, conical. Apical region elongate and moderately acute. Cross sections depressed all along the rostrum. Short and weakly developed dorsolateral apical grooves. Long intermediate ventral groove, with smooth edges, extending from the apical to the alveolar region, and fading out towards the alveolar border, with variably developed splitting surface. Short dorsoalveolar depression or flattening, not reaching the alveolar border. Apical line cyrtolineate. Alveolus ventrally displaced, occupying circa one-third of the rostrum.
Differential diagnosis The genus differs from Holcobelus (upper Aalenian–lower Bajocian) by its overall depressed rostrum, the presence of short dorsolateral apical grooves and by its broader ventral groove, with smooth borders; it differs from Acrocoelites (upper Pliensbachian–lower Aalenian) by its overall depressed rostrum and the different morphology of the ventral groove, long and intermediate with splitting surface.
Remarks The genus Lissajousibelus Weis nov. gen. is tentatively assigned to the Belemnopseina, on the base of the intermediate ventral groove with splitting surface. It is not possible to assign Lissajousibelus to a known family with certainty, although it shows some affinities with the Holcobelidae, an Aalenian–Bajocian family to which “Belemnites harleyi” had previously been assigned. The depressed rostrum, the morphology of the ventral groove and splitting surface, and the dorsolateral apical grooves are not typical characters for Holcobelidae (see also Weis et al. 2012, p. 17); however, some holcobelids (few individuals of Holcobelus munieri (Eudes-Deslongchamps 1878) and Calabribelus pallinii Weis, Mariotti and Riegraf, 2012) show both a rudimentary splitting surface and remnants of reduced dorsolateral grooves (Weis et al. 2012). Nevertheless, evidence about the phylogenetic relationships between Lissajousibelus and the holcobelids is considered inadequate (see also chapter “Discussion”) at the present stage of investigations.
Occurence Lowermost Toarcian (Tenuicostatum Chronozone) of western France (Calvados, Sarthe, Vendée) and northern and eastern Spain (Asturìas and Iberian Range). Possibly also upper Pliensbachian of western France (Vendée and Calvados).
Lissajousibelus harleyi (Mayer 1866)
non 1820 Belemnites canaliculatus—Schlotheim, p. 49. [= Pachybelemnopsis canaliculata (von Schlotheim 1820), fide Riegraf 2000]
1853 Belemnites canaliculatus—Harlé, p. 14.
*1866 Belemnites harleyi—Mayer, p. 362.
1878 Belemnites canaliculatus Schlotheim—Eudes-Deslongchamps, p. 58, pl. VII, Figs. 21–26.
1915 Belemnopsis harleyi Mayer—Lissajous, p. 146
1919 Belemnites canaliculatus—Lissajous, p. 43f.
v.1927 Aulacoteuthis harleyi Mayer—Lissajous, p. 35, pl. IV, Figs. 1–3.
1927 Belemnites canaliculatus Deslongchamps—Stolley, p. 122.
1971 Belemnites harleyi Mayer—Mouterde, p. 378ff.
1974 Aulacoteuthis harleyi (Mayer)—Suarez-Vega, p. 51.
1994 Acrocoelites harleyi Lissajous (sic)—Doyle, p. 113.
2002 Aulacoteuthis harleyi (Mayer)—Vernhet et al., p. 98.
v.2012 Holcobelus harleyi (Mayer)—Weis et al., p. 22, pl. 2, Figs. 1–7 and text-Fig. 3c (cum syn.)
Type material Mayer (1866) did not designate a holotype. He mentions the presence of specimens in several collections, which constitute then the type series. One of the mentioned collections is the “École des mines” (Paris), which is now partially held by the Geological Museum of the University Claude Bernard, Lyon-Villeurbanne (France). The “École des Mines” collection in Lyon contains several historical specimens with handwritten determination “Belemnites harleyi”. One of them, no. UCBL EM18076, from the lowermost Toarcian of Fontaine-Etoupefour (Calvados, France) is hereby designated as the lectotype and re-illustrated herein (Fig. 2h; also figured in Weis et al. 2012: pl. 2, Fig. 5a–b, with erroneous stratigraphic information). Five additional specimens figured in Weis et al. (2012) from the same collection and nearby localities are hereby designated as paralectotypes (Weis et al. 2012: pl. 2, Figs. 1a–c, 3a–b, 4a–b, 6a–b, 7).
Studied material Sixty-nine complete or subcomplete specimens from the Tenuicostatum Chronozone, Semicelatum Subchronozone, Semicelatum Zonule of Feuguerolles-sur-Orne (MHNLM no. 2015.1.1–11 and collection Chesnier); six complete to subcomplete specimens from the ?uppermost Pliensbachian or basal Toarcian, Monceaux-en-Bessin (collection Chesnier); two alveolar fragments from the ?Pliensbachian or lowermost Toarcian of Surain (Vieux-Pont), collection Chesnier; six complete specimens from the Toarcian of Asnières-sur-Vègre and Prévigné (Sarthe, France), coll. MHNLM no. 2003–1–2107; four specimens without locality (UCBL EM20.407–410); three specimens from the Pliensbachian–Toarcian boundary beds of Luron (Vendée, France), coll. UCBL EM20.404–406); four specimens from the Toarcian of Calvados, France, former collection Pellat (MNHNL BEL350 and 373).
Diagnosis As for the genus.
Description Small to medium sized, moderately robust and conical rostrum. The outline is symmetrical and conical to slightly cylindroconical. The profile is slightly asymmetrical and conical. The apical region is tapering regularly to an elongate and moderately acute apex, which becomes obtuse in late ontogenetic stages. Cross sections are depressed elliptical on the entire length of the rostrum; the depression is more marked on the stem and apical region than on the alveolar region. At the anterior margin of the rostrum, close to the alveolar border, cross sections are almost subquadrate, due to the dorsoalveolar flattening. Short dorsolateral apical grooves are commonly developed. A broad intermediate ventral groove extends from close the apex to the alveolar border, fading out into a broad depression on the alveolar region. A reduced, clearly delimited splitting surface is developed; it does not reach the alveolar wall or the apical line and appears thus to have developed only at later ontogenetic stages (adult). A short and shallow dorsoalveolar depression is commonly present; in some individuals, it is replaced by a dorsoalveolar flattening. Lateral lines consist in two parallel running indistinct depressions in lateral and ventrolateral position and confined to the alveolar region. The apical line is sharply delimited, cyrtolineate. The alveolus occupies approximately one-third of the total length of the rostrum and is slightly ventrally eccentric: the eccentricity of the protoconch (EP) varies between 10 and 13 %. The alveolar angle varies between 22° and 24°.
Phragmocone structures Traces of the siphuncle have been observed, indicating that the position of the groove is ventral. The dimensions of the protoconch in one measured specimen are 0.29 mm (width) and 0.31 mm (length). An enigmatic hollow structure, designated as “protoconch pocket” by Doguzhaeva et al. (2014) is present on the dorsal edge of the protoconch (Fig. 3d), and appears similar to those observed in Holcobelus and Pachybelemnopsis (Doguzhaeva et al. 2014, Fig. 4).
Ontogeny The primordial rostrum has not been observed in the studied material. Early juvenile stages are slender elongate, cylindrical in profile and cylindrical or subhastate in outline. A dorsoalveolar flattening and a broad intermediate ventral groove are well developed, but no splitting surface is developed at this early stage. The subadult–adult stages are characterized by an increase in length and elongate conical shape. At adult–gerontic stages, the acute apical region is more attenuated and rostra more robust due to an increase in width. The splitting surface develops only at the adult stage.
Remarks Measurements of the rostrum are given in Table 1, in addition to those given by Weis et al. (2012, p. 23). The elongation index (Ie) varies between 0.23 and 0.26, which are typical values for Passaloteuthis and Acrocoelites (Schlegelmilch 1998). The compression index (Ica) varies between 0.88 and 0.98 (or 0.82–0.98 taking into consideration data from Weis et al. 2012), which is a typical range for Pachybelemnopsis (Schlegelmilch 1998). The length of the splitting surface (Ls) varies considerably, occupying between 24 and 60 % of the total rostrum length. The size of the protoconch is comparable with that of Holcobelus given by Doguzhaeva et al. (2014, Table 1). Protoconch pockets are reported to date only in Lissajousibelus (herein), Holcobelus and Pachybelemnopsis (Doguzhaeva et al. 2014); their function and taxonomic value are unknown.
One specimen shows an irregularly shaped, incised dorsoalveolar groove (Fig. 2b). The occasional presence of such poorly developed dorsoalveolar grooves (“Dorsalrinne” in Riegraf 1980) is known in some taxa and considered to be of little taxonomic value (Stevens 1965, p. 41; Riegraf 1980, p. 36; Doyle 1992, p. 53), though this feature may contribute to highlight phylogenetic relationships (Jeletzky 1980, p. 4).
Occurrence As for the genus.
Palaeobiogeography and biostratigraphy
Belemnite assemblages from the lowermost Toarcian Tenuicostatum Chronozone and corresponding units (Page 2003) are known from several localities in the United Kingdom (Doyle 1990–1992), southwestern Germany (Riegraf 1980; Riegraf et al. 1984), Bulgaria (Stoyanova-Vergilova 1993), the Rif mountains, Morocco (Sanders et al. 2013), central Italy and Sicily (Weis et al. 2015), Belgium and Luxembourg (Maubeuge 1952; Delsate 1997). All these assemblages contain one or more of the following taxa: Passaloteuthis laevigata (von Zieten 1830), Passaloteuthis milleri (Phillips 1867), Acrocoelites ssp., Parapassaloteuthis ssp. and Pseudohastites longiformis (Blake in Tate and Blake 1876). In southwestern Germany only, Micropassaloteuthis fistulata Riegraf, Werner and Lörcher, 1984 is also present. The presence of a peculiar form such as Lissajousibelus harleyi could hardly have been overlooked. It is therefore probable that the species had a more limited palaeobiogeographic distribution than the aforementioned taxa; this distribution area is part of the western Tethys and comprises the epicontinental seas surrounding parts of the Armorican Massif and the Iberian Massif (Fig. 1b). The same area is known as the transitional zone in the Aalenian–Bajocian, where (Sub)Boreal and (Sub)Mediterranean faunas were mingling (Weis and Mariotti 2008; Mariotti et al. 2010). A similar pattern with mixed faunas has been reported for Pliensbachian–Toarcian brachiopod assemblages (Alméras and Bécaud 2002). In ammonites, a pattern of northwards migration of Mediterranean ammonites towards southern England has been evidenced for the Tenuicostatum Chronozone; this palaeobiogeographic pattern can be correlated with a major transgression after a regressive period at the end of the late Pliensbachian, facilitating the connection between Mediterranean and northwestern Europeans basins (Morard et al. 2003; Dera et al. 2011).
The stratigraphic range of Lissajousibelus harleyi in Feuguerolles-sur-Orne is entirely within the Tenuicostatum Chronozone, Semicelatum Subchronozone. Slightly older records of Belemnites harleyi have been reported by Lissajous (1927; uppermost Pliensbachian) based on historical collection data; however, their exact stratigraphic position needs confirmation. No records of Lissajousibelus are known after the Toarcian Oceanic Anoxic Event (T-OAE) which coincides with the Tenuicostatum–Serpentinum zonal boundary and marks an important extinction event in marine biota, including belemnites (Ullmann et al. 2014; Dzyuba et al. 2015).
The peculiar morphological characters of Lissajousibelus harleyi were outlined by several authors, but led to different taxonomic interpretations; “Belemnites” harleyi has been subsequently assigned to Belemnopsis (Lissajous 1915; Stolley 1927), Aulacoteuthis (Lissajous 1927), Acrocoelites (Doyle 1994) and Holcobelus (Riegraf 1995; Weis et al. 2012). The new material from Feuguerolles-sur-Orne allows a more detailed understanding of the morphology of Lissajousibelus and a better differential diagnosis towards the mentioned genera. The distinctive features of Lissajousibelus are the broad ventral groove with smooth edges, the clearly delimited splitting surface, the overall depressed rostrum and the presence of short dorsolateral apical grooves and a dorsoalveolar depression; the combination of these characters allow us to distinguish Lissajousibelus from the genus Holcobelus (family Holcobelidae). The similar rostrum shape and the similar position of the intermediate ventral groove in Lissajousibelus and Holcobelus could represent a case of homeomorphism; this hypothesis is supported by the different ages of Lissajousibelus (earliest Toarcian) and Holcobelus (Aalenian–Bajocian), and the lack of connecting forms. On the other hand, Lissajousibelus is distinguished from Pachybelemnopsis by its short cylindroconical shape, its dorsolateral apical grooves, and the long intermediate ventral groove, a feature that is not equivalent with the alveolar groove and splitting surface of Pachybelemnopsis (Combémorel et al. 1994; see also below).
Lissajousibelus harleyi also bears some similarities with “Holcobelus” kinasovi Sachs, in Sachs and Nalnjaeva 1975, from the lower Toarcian (Commune Zone) to possibly Bajocian of northern Siberia and northeastern Russia. Both species have a depressed cross section and a long incised ventral groove. Re-investigation of “H.” kinasovi, stored in the Central Siberian Geological Museum (Novosibirsk, Russia) revealed that the holotype of this species (Sachs and Nalnjaeva 1975, pl. 12, Fig. 3) possesses feeble dorsolateral apical grooves. “H.” kinasovi may be distinguished from Lissajousibelus harleyi by its more elongate rostrum, with the ventral groove beginning at the apex and not associated with splitting surface. The taxonomic position of “H.” kinasovi is yet unclear. It certainly does not belong to Holcobelus (Weis et al. 2012) and possibly represents a new genus directly related to Acrocoelites (Megateuthididae, Belemnitina). Other “Holcobelus” sensu Tuchkov (1954), Sachs and Nalnjaeva (1975), and Nalnjaeva (in Challinor et al. 1992) from northern and eastern Russia do not belong to Holcobelus as well (Weis et al. 2012). They are revised herein: Acrocoelites umarensis (Tuchkov 1954), Lenobelus gravis Gustomesov, 1966, ?Lenobelus sp. (=Holcobelus sp. in Challinor et al. 1992, pl. 132, Fig. 4). Thus, the rostra of Lissajousibelus harleyi and “Holcobelus” kinasovi show a remarkable morphological resemblance, although the specifics of ventral groove as well as the absence of evidence for a splitting surface in “H.” kinasovi argues for attributing these species to different genera, families and even suborders.
The genus Lissajousibelus shows strong homeomorphism with some other ventrally flattened and grooved Boreal taxa of the Belemnitina, such as Holcobeloides (Lagonibelinae) and Boreioteuthis (Pachyteuthidinae) from the Cylindroteuthididae, especially Holcobeloides altdorfensis (Ducrotay de Blainville 1827) and Boreioteuthis absoluta (Fischer 1837), and Aulacoteuthis from the Oxyteuthididae, especially A. ernsti Mutterlose and Baraboshkin 2003. According to Gustomesov (1964), some individuals of Holcobeloides altdorfensis and H. beaumontianus (d’Orbigny 1842–1851) possess a narrow slit-like depression at the bottom of a broad and long ventral groove. Besides homeomorphic similarity, the species Aulacoteuthis ernsti, like Lissajousibelus harleyi, is characterized by the central to slightly ventrally displaced apical line. The genera Holcobeloides (middle Callovian to Oxfordian), Boreioteuthis (Oxfordian to Aptian) and Aulacoteuthis (late early Barremian) are distinguished by their non-canaliculate ventral groove, which starts from the apex, and by the absence of splitting surface and dorsolateral apical grooves. In addition, adult Boreioteuthis are more robust and larger in size than Lissajousibelus.
It can be deduced from the above information that taxa morphologically similar to Lissajousibelus (Table 2) appear to have developed independently in several evolutionary lineages, belonging to different families: “Holcobelus” kinasovi (family uncertain) in the Early–Middle Jurassic, Holcobelus (Holcobelidae) in the Middle Jurassic, Holcobeloides (Cylindroteuthididae) in the Middle–Late Jurassic, Boreioteuthis (Cylindroteuthididae) in the Late Jurassic–Early Cretaceous, Aulacoteuthis (Oxyteuthididae) in the late Early Cretaceous (Fig. 4). On the other hand, our data do not definitely preclude the possibility of a yet unrecognized phylogenetic relationship between Lissajousibelus harleyi and the Boreal-Arctic “Holcobelus” kinasovi or the (Sub) Mediterranean Holcobelus.
Changes in groove morphology amongst Early–Middle Jurassic belemnites
For the later Early Jurassic and early Middle Jurassic (late Pliensbachian–early Bajocian), it is possible to observe a clear trend regarding the ventral groove element of belemnites occurring in the Western Tethys (Fig. 4). A first morphological step relevant in this discussion is represented by the Pliensbachian–Aalenian genus Acrocoelites (Megateuthididae, Belemnitina) which develops a well-incised ventral apical groove, without splitting surface. The apical ventral groove of the Boreal family Cylindroteuthididae (Belemnitina) can be considered equivalent to the apical ventral groove of megateuthids; a direct derivation of Cylindroteuthididae from Megateuthididae, or a common origin of both, is therefore deemed possible, as supported by Jeletzky (1966, p. 139), Combémorel et al. (1994, p. 48) and Sachs and Nalnjaeva (1975, p. 135). A second step is represented by Lissajousibelus and Holcobelus (Holcobelidae, Belemnopseina): here, the dorsolateral apical grooves are being reduced and the ventral groove extends from the apical region to the alveolar region (intermediate position sensu Riegraf 1980). This intermediate ventral groove is associated with a more or less developed splitting surface. A different morphology is represented by the mesohibolitids, e.g. Pachybelemnopsis; here the groove is confined to the stem and alveolar part of the rostrum and a well-defined triangular splitting surface is present. It is not clear if the alveolar groove of Pachybelemnopsis evolved from the intermediate groove of holcobelids and/or morphologically similar forms (e.g. Lissajousibelus), as has been suggested by Riegraf (1980) and Weis et al. (2012), or if it evolved independently, as suggested by Jeletzky (1966: from Hastitidae, Belemnitina), Combémorel et al. (1994), and discussed also by Iba et al. (2014). Future studies detailing the evolution of the lateral line patterns and investigating phragmocone details of these taxa may contribute to unravel the phylogeny of the early canaliculate belemnites (suborder Belemnopseina).
The new material collected in the type area has provided evidence that (1) “Belemnites” harleyi belongs to a new genus, Lissajousibelus nov. gen. Weis, characterized by the presence of short dorsolateral apical grooves and a long intermediate groove with splitting surface; (2) the previously uncertain stratigraphic position of L. harleyi is now confirmed as lowermost Toarcian, Tenuicostatum Chronozone; (3) its geographic distribution is limited to western France and northeastern Spain; (4) the taxon is amongst the earliest belemnites worldwide to have developed a long intermediate ventral groove with a rudimentary developed splitting surface, a feature considered a major step in the evolutionary history of belemnites.
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We thank the curators Emmanuel Robert (Geological collections, University Claude Bernard, Lyon-Villeurbanne) and Nicolas Morel (Musée d’histoire naturelle, Le Mans) for the loan of study material. Emmanuel Robert also kindly sent us photographs of Lissajous’ original material. Domenico Mannetta (Sapienza University, Rome) prepared the thin sections of the belemnite rostra. Michel Rioult (formerly University of Caen) communicated his observations on the occurrence of belemnites in the Toarcian of Normandy to us. Simone Guérin-Franiatte (Nancy) contributed with her expertise to the determination of the ammonites of the Feuguerolles-sur-Orne section. Marianne Kayser (Musée national d’histoire naturelle, Luxembourg) assisted us with the artwork. We are grateful to two anonymous reviewers for their critical suggestions and to the editors for their helpful comments on an earlier version of the manuscript. This contribution acknowledges the financial support provided by the research project “Systematics, biostratigraphy and palaeobiogeography of Jurassic belemnites” at the National Museum of Natural History, Luxembourg.
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Weis, R., Dzyuba, O.S., Mariotti, N. et al. Lissajousibelus nov. gen., an Early Jurassic canaliculate belemnite from Normandy, France. Swiss J Palaeontol 134, 289–300 (2015). https://doi.org/10.1007/s13358-015-0086-x
- Anglo-Paris Basin