Aphelaeceras azzelmattiense, Korn & Bockwinkel, 2022
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publication ID |
https://doi.org/ 10.5852/ejt.2022.831.1871 |
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publication LSID |
lsid:zoobank.org:pub:EAA2EAE2-DA8B-4516-B332-CB8423B8EEAA |
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DOI |
https://doi.org/10.5281/zenodo.6903238 |
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persistent identifier |
https://treatment.plazi.org/id/88F44087-A4B4-4FD7-9C36-CF189028289E |
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taxon LSID |
lsid:zoobank.org:act:88F44087-A4B4-4FD7-9C36-CF189028289E |
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treatment provided by |
Felipe |
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scientific name |
Aphelaeceras azzelmattiense |
| status |
sp. nov. |
Aphelaeceras azzelmattiense sp. nov.
urn:lsid:zoobank.org:act:88F44087-A4B4-4FD7-9C36-CF189028289E
Fig. 25 View Fig , Table 14 View Table 14
Diagnosis
Species of Aphelaeceras reaching about 130 mm conch diameter. Conch with weakly compressed whorl profile (ww/wh ~ 0.65); venter double-keeled with narrow longitudinal groove; flanks convergent, umbilical margin subangular, umbilical wall oblique, weakly concave. Shell surface nearly smooth.
Etymology
Named after the type locality Gara Azzel Matti.
Type material
Holotype ALGERIA • Ahnet , west-southwest of Gara Azzel Matti; ‘ Dalle des Iridet’ (Ammonellipsites-Merocanites Assemblage; Tournaisian–Viséan boundary interval); Wendt and Kaufmann 1995 Coll.; illustrated in Fig. 25 View Fig ; MB.C.30479.1 .
Paratype ALGERIA • 1 specimen; Ahnet , west-southwest of Gara Azzel Matti; ‘ Dalle des Iridet’ (AmmonellipsitesMerocanites Assemblage; Tournaisian–Viséan boundary interval); Wendt and Kaufmann 1995 Coll.; MB.C.30479.2 .
Description
Holotype MB.C.30479.1 is an incomplete, partially broken and desert-eroded specimen with a conch diameter of almost 120 mm ( Fig. 25 View Fig ). The conch is very thinly discoidal (ww/dm=0.19) with a rather wide umbilicus (uw/dm=0.44) and moderate coiling rate (WER =1.95). The conspicuous, lyriform whorl profile is widest at the distinct, subangular umbilical edge. It shows an oblique, concave umbilical wall, convergent flanks and a double-keeled venter with a deep longitudinal median groove.
Paratype MB.C.30479.2 is an incomplete specimen with 60 mm diameter, which largely complements the morphology of the holotype.
Remarks
Aphelaeceras azzelmattiense sp. nov. differs from all the other species of the genus in the concave umbilical wall.
Table 14. Conch dimensions (in mm) and ratios of Aphelaeceras azzelmattiense sp. nov.
| Specimen | dm | ww | wh | uw | ah | ww/dm | ww/wh | uw/dm | WER | IZW |
|---|---|---|---|---|---|---|---|---|---|---|
| MB.C.30479.1 | 119.2 | 22.9 | 35.6 | 52.9 | 33.8 | 0.19 | 0.64 | 0.44 | 1.95 | 0.05 |
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