Published July 20, 2022 | Version v1
Taxonomic treatment Open

Aphelaeceras azzelmattiense Korn & Bockwinkel 2022, sp. nov.

  • 1. Museum für Naturkunde, Leibniz Institut for Research on Evolution and Biodiversity, Invalidenstrasse 43, 10115 Berlin, Germany.
  • 2. Dechant-Fein-Strasse 22, 51375 Leverkusen, Germany.

Description

Aphelaeceras azzelmattiense sp. nov.

urn:lsid:zoobank.org:act: 88F44087-A4B4-4FD7-9C36-CF189028289E

Fig. 25, 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; 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). 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.

Notes

Published as part of Korn, Dieter & Bockwinkel, Jürgen, 2022, Early Carboniferous nautiloids from the Central Sahara, southern Algeria, pp. 67-108 in European Journal of Taxonomy 831 on pages 97-98, DOI: 10.5852/ejt.2022.831.1871, http://zenodo.org/record/6885198

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Linked records

Additional details

Identifiers

Biodiversity

Collection code
MB
Family
Trigonoceratidae
Genus
Aphelaeceras
Kingdom
Animalia
Material sample ID
MB.C.30479.1 , MB.C.30479.2
Order
Nautilida
Phylum
Mollusca
Scientific name authorship
Korn & Bockwinkel
Species
azzelmattiense
Taxonomic status
sp. nov.
Taxon rank
species
Type status
holotype , paratype
Taxonomic concept label
Aphelaeceras azzelmattiense Korn & Bockwinkel, 2022