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Collarotretella
Taxonomy
Collarotretella was named by Mergl (1997). Its type is Collarotretella septata.
It was assigned to Siphonotretinae by Mergl (1997); and to Siphonotretidae by Williams et al. (2007).
It was assigned to Siphonotretinae by Mergl (1997); and to Siphonotretidae by Williams et al. (2007).
Species
C. septata (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Collarotretella Mergl p. 102 |
| 2007 | Collarotretella Williams et al. p. 2576 |
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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 | |
|---|---|---|
| M. Mergl 1997 | Minute siphonotretacean with biconvex shell, posteroventrally directed pedicle foramen which expands considerably in the shell wall and is internally bounded by a thickened circular collar. Ventral pseudointerarea low. Dorsal valve without distinct pseudointerarea, deep umbonal chamber bisected by short but well-developed median septum. Exterior is devoid of strong spines, the ba: ie:i of minute :ipinc:i ob:icurc | |
| A. Williams et al. 2007 | Shell biconvex, broadly oval; exterior sparsely spinose, nearly smooth; foramen large, circular, directed posteroventrally, internally with thickened collar; ventral pseudointerarea low, small, undivided; dorsal pseudointerarea obscure; dorsal interior with short, distinct median septum. |