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Acanthotretella
Taxonomy
Acanthotretella was named by Holmer and Caron (2006). Its type is Acanthotretella spinosa.
It was assigned to Brachiopoda by Holmer and Caron (2006).
It was assigned to Brachiopoda by Holmer and Caron (2006).
Species
A. spinosa (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Acanthotretella Holmer and Caron |
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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. †Acanthotretella Holmer and Caron 2006
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†Acanthotretella spinosa Holmer and Caron 2006
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. E. Holmer and J.-B. Caron 2006 | Shell essentially organic in composition, probably with very minor organo-phosphatic mineral component, ventri-biconvex, inequivalved; exterior of both valves covered by shell-penetrating, long, slender spine-like structures of organic and partially mineralized composition, which are generally posteriorly inclined at an oblique angle away from the anterior margin; ventral valve apsacline, with slender, long, flexible and lingulid-like pedicle with a central coelomic region, emerging through an external tube from a circular
apical foramen, continued internally as a long internal pedicle tube; visceral area of both valves short, triangular, not extending to mid-valve, possibly with single umbonal scar; other interior features poorly known. |