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Transcaucasathyris
Taxonomy
Transcaucasathyris was named by Shen et al. (2004).
It was assigned to Spirigerellinae by Shen et al. (2004); and to Transcaucasathyriinae by Angiolini and Carabelli (2010).
It was assigned to Spirigerellinae by Shen et al. (2004); and to Transcaucasathyriinae by Angiolini and Carabelli (2010).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2004 | Transcaucasathyris Shen et al. p. 893 figs. 7.30-7.43, 11 |
| 2010 | Transcaucasathyris Angiolini and Carabelli p. 75 |
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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.
G. †Transcaucasathyris Shen et al. 2004
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†Araxathyris araxensis minor Grunt 1965
†Transcaucasathyris araxensis Grunt 1965
†Transcaucasathyris kandevani Fantini Sestini and Glaus 1966
†Transcaucasathyris lata Grunt 1965
†Transcaucasathyris minor Grunt 1965
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S.-Z. Shen et al. 2004 | Small size for Spirigerellidae, subcircular in outline, subequally biconvex; usually widest at shell midlength, anterior commissure parasulcate or uniplicate. Ventral beak strongly curved, perforated by small foramen; sulcus weak to strong. Surface smooth except for several fine growth lines. Ventral interior with two short and divergent dental plates, dental plates straight to valve floor, closely adjoining the lateral valve walls; no spondylium. Dorsal interior with narrow hinge plate. |