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Fig. 3 | Swiss Journal of Palaeontology

Fig. 3

From: Lissajousibelus nov. gen., an Early Jurassic canaliculate belemnite from Normandy, France

Fig. 3

Lissajousibelus harleyi (Mayer 1866). a Longitudinal split of the alveolar and stem region, the outline of the splitting surface is evidenced by the whitened area on the left (UCBL FSL.27509); scale bar equals 10 mm; figured also in Lissajous 1927, pl. IV, Fig. 3. b Longitudinal split, with the splitting surface visible along the left rostrum margin (MHNLM 2015.1.10). c Longitudinal split, with the splitting surface visible along the left rostrum margin (MHNLM 2015.1.11). d SEM image showing the protoconch and surrounding rostral mass in a splitted section (MHNLM 2003.1.2107c); d 1 complete view of the egg-shaped protoconch, d 2 close-up of the upper protoconch wall (dorsal) showing the protoconch pocket (pp); scale bar equals 100 µm. e Longitudinal thin section of a slender, subadult individual, ventral side left (MHNLM 2015.1.9); scale bar equals 5 mm. f Longitudinal thin section of a (sub)adult individual, ventral side left (MNHNL BEL373b); scale bar equals 5 mm. g Longitudinal thin section of an adult individual, ventral side right (MHNLM 2015.1.8); scale bar equals 5 mm. h Thin cross section (MHNLM 2015.1.7); h 1 anterior alveolar region, showing the dorsal depression (on the top) and the outfading ventral groove; h 2 stem region, showing the ventral groove, progressively deepening during growth; scale bar equals 5 mm. i Thin cross section at the posterior alveolar region, showing the ventral groove, progressively deepening during growth (MHNLM 2015.1.6); scale bar equals 5 mm. Specimens originate from the lower Toarcian, Tenuicostatum Chronozone, Semicelatum Subchronozone of Feuguerolles-sur-Orne, Calvados (bc, e, gi), the lower Toarcian of Calvados, unknown locality (f), the “Domerian” (?) of Mervent, Vendée (a) and the Toarcian of Asnières-sur-Vègre or Prévigny, Sarthe (d)

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