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Exilitheca
Taxonomy
Exilitheca is a genus. It is not extant.
It was assigned to Exilithecida by Sepkoski (2002); and to Allathecidae by Parkhaev and Demidenko (2010).
It was assigned to Exilithecida by Sepkoski (2002); and to Allathecidae by Parkhaev and Demidenko (2010).
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 2002 | Egdetheca Sepkoski |
| 2002 | Exilitheca Sepkoski |
| 2010 | Exilitheca Parkhaev and Demidenko p. 939 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Y. Parkhaev and Y. Demidenko 2010 | "Shell conical, long, and curved. Expansion angle changes from 8° in apical part to 22° in middle part, then towards aperture decreases to 9° (Sysoev, 1972). Cross-section rounded-triangular, sometimes rounded-trapeziform. Apical part of shell pointed. Aperture straight or almost straight. Shell smooth or with slightly developed longitudinal and transverse ribs." |