Alfaites, Valent & Fatka & Marek, 2019
publication ID |
https://doi.org/ 10.5852/ejt.2019.491 |
publication LSID |
lsid:zoobank.org:pub:C2A4298C-0A0C-4AA5-AC9C-999ED58ED532 |
DOI |
https://doi.org/10.5281/zenodo.5928735 |
persistent identifier |
https://treatment.plazi.org/id/D93587D6-FFB3-DF7A-DED8-F9B2FD8AFB74 |
treatment provided by |
PlaziZenodoSync |
scientific name |
Alfaites |
status |
gen. nov. |
Alfaites gen. nov.
urn:lsid:zoobank.org:act:6CCEF3A7-D24B-4777-9E08-BFB8DCF68F87
Type species
Alfaites romeo sp. nov.
Etymology
The name ‘ Alfaites ’ refers to the first letter of Greek alphabet – alpha. The cross-section of the conch ( Fig. 2H View Fig. 2 ) resembles the large letter alpha and the small letter alpha (turned 90° clockwise) can also be discerned in Fig. 2C View Fig. 2 .
Diagnosis
Conch with almost flat slopes of dorsal side; dorsal side broadly rounded; ventral side very slightly vaulted to almost flat; lateral edges sharply rounded. Subtriangular cross-section. Amblygonal aperture. Sculpture of conch consists of transverse rarely anastomosing ribs. No apical septa were found.
Monoclaviculate operculum with clavicles of bow-shaped transverse cross-section. Open margins of clavicles overlap above inner surface operculum (interclavicular concavity). Distal ends of clavicles cut off. Bases of cardinal processes diverge at 90° angle. Uncommon and relatively robust cardinal teeth developed along the dorsal margin. Rooflets distinct. Sculpture of operculum consisting of growth-lines and fine radial ribs.
Occurrence
Buchava Formation, middle Cambrian, Drumian, Skryje-Týřovice Basin, Barrandian area, Czech Republic.
Remarks
Morphology of both conch and operculum does not allow the classification of Alfaites gen. nov. to any known family of the order Hyolithida . This genus resembles Carinolithes Sysoev, 1958 as emended by Berg-Madsen & Malinky (1999) in the morphology of the cardinal processes, but the operculum of Alfaites gen. nov. is monoclaviculate, thus differing from the platyclaviculate operculum of Carinolithes . Similarly, the shape of the transverse cross-section of the conch (subtriangular in Alfaites and rounded -triangular with distinct keel on dorsum in Carinolithes ) and the sculpture (distinct transverse ribs in Alfaites and usually fine growth-lines in Carinolithes ) are different. The genus Alfaites , including its type species A. romeo sp. nov., was first recognized as a separate taxon in an unpublished report by the late Ladislav Marek (1983: 36–38).
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