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Gracilithecidae
Taxonomy
Gracilithecidae was named by Syssoiev (1972). Its type is Gracilitheca.
It was assigned to Orthothecida by Malinky and Skovsted (2004).
It was assigned to Orthothecida by Malinky and Skovsted (2004).
Subtaxa
Gracilitheca (type genus)
Synonymy list
| Year | Name and author |
|---|---|
| 1972 | Gracilithecidae Syssoiev |
| 2004 | Gracilithecidae Malinky and Skovsted p. 565 |
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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.
Fm. †Gracilithecidae Syssoiev 1972
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G. †Gracilitheca Syssoiev 1968
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†Gracilitheca mirabilis Valent et al. 2012
†Gracilitheca triangularis Valent et al. 2012
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. M. Malinky and C.B. Skovsted 2004 | Orthothecid hyolith with shallow ventral furrow, grading into blunt lateral edges that extend to form a distinct protrusion along the entire length of the lateral edges of the conch (emended from Syssoiev 1968: 39). |