Table 2 Morphological comparison of the discussed taxa
From: Lissajousibelus nov. gen., an Early Jurassic canaliculate belemnite from Normandy, France
Genus/species | Grooves | Splitting surface | Rostrum shape | Cross section | Alveolar depth | Alveolar angle | |||
|---|---|---|---|---|---|---|---|---|---|
Apical | Interm. | Alveolar | |||||||
Dorsolat. | Ventral | ||||||||
Acrocoelites | Yes | Yes | – | – | No | Conical–cylindrical, moderatley robust to elongated | Rounded subquadrate to compressed | ca. 1/4 | 21°–30° |
Lissajousibelus | Yes | – | Yes | – | Yes | Conical–cylindroconical, moderatley robust | Depressed | ca. 1/3 | 22°–24° |
“Holcobelus” kinasovi | Yes | Yes | – | – | no | Cylindrical, elongated | Rounded subquadrate to depressed | ca. 1/5 | 24° |
Holcobelus | – | – | Yes | – | Yes | Conical–cylindroconical, robust to elongated | Rounded subquadrate to compressed | ca. 1/3 to 1/4 | 20°–24° |
Pachybelemnopsis | – | – | – | Yes | Yes | Subcylindrical-hastate, elongated | Depressed | ca. 1/3 to 1/4 | ca. 17°–23° |
Holcobeloides | – | Yes | – | – | No | Conical–cylindrical, elongated | Depressed | ca. 1/4 to 1/2 | 23°–29° |
Boreioteuthis | – | Yes | – | – | No | Cylindrical–cylindroconical, moderately robust | Depressed to slightly compressed | ca. 1/3 to 1/2 | 17°–27° |
Aulacoteuthis | – | Yes | – | – | No | Cylindroconical-subhastate, moderately elongate | Subrounded | ca. 1/3 | ca. 16°–20° |