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Mengius acutidens
Taxonomy
Mengius acutidens was named by Thies et al. (2024). Its type specimen is GG 435, a partial skeleton, and it is a 3D body fossil. Its type locality is Grimmen clay pit, Lehmahagen, which is in a Toarcian marine claystone in Germany. It is the type species of Mengius.
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Mengius acutidens Thies et al. |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Mengius acutidens Thies et al. 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. Thies et al. 2024 | The genus contains fusiform fishes of moderate size. The scales are coarsely serrated at the posteroventral margin. The following characters are diagnostic: (1) longitudinal articu- lation of the scales only by a strong anterior dorsal process, (2) relative position of the lower jaw articulation at the level around the centre of the orbit, (3) symplectic is not directly involved in the jaw joint, (4) length to width ratio of parietals (="fron- tals") in adult sized individuals equals or is larger than three, (5) preorbital portion of parietal (="frontal") not significantly large, (6) left and right nasal bones close to each other, (7) most anterior supraorbital bone expanded anteroventrally, making the anterodorsal corner of the orbit, (8) posterior rim of the orbit formed by three infraorbital bones, (9) distance from anterior tip of premaxilla to posterior edge of operculum equals approxi- mately four times maximum diameter of orbit, (10) parietals only slightly tapering anteriorly, (11) one pair of extrascapulars, (12) extrascapulars abut in dorsal midline, (13) external surface of skull roof smooth, (14) number of suborbitals three or four, (15) preoperculum slightly curved, without clear definition of dorsal and ventral arm, (16) ventral margin of operculum convex and confluent with caudal margin, (17) number of postcleithra four, (18) maxillary pit line present, (19) oral canal present, (20) dentition non-tritoral, (21) premaxillary and dentary teeth of piercing type, tall, slender, styliform, pointed. |
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||