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Platyceras (Euthyrachis)
Taxonomy
Platyceras (Euthyrachis) was named by Tyler (1965) [Sepkoski's age data: D Give Sepkoski's reference number: 362].
It was reranked as Euthyrachis by Sepkoski (2002).
It was assigned to Platyceras by Tyler (1965); and to Archaeogastropoda by Sepkoski (2002).
It was reranked as Euthyrachis by Sepkoski (2002).
It was assigned to Platyceras by Tyler (1965); and to Archaeogastropoda by Sepkoski (2002).
Species lacking formal opinion data
Synonymy list
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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.
Subg. †Platyceras (Euthyrachis) Tyler 1965
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. H. Tyler 1965 | Shells of medium size for genus; beak relatively untorted, unguiform, subsymmetrical; sharp carina extending in almost perfectly straight direction from apex to peripheral notch of aperture; apical portion lying out of contact with later part of shell; carina creating plane of almost perfect bilateral symmetry in pre-medial growth portion of shell; symmetry increasingly lost from apex to aperture as apical flank flares outward farther from carinal plane than does apertural flank; anal emargination sinus V-shaped with angle of 15 to 90 degrees, its apex coinciding with carina; aperture subovoid with peripheral margin lengthened, producing crudely triangular or heart-shaped outline; profile of carina essentially that of logarithmic spiral lacking its innermost complete whorl; collabral growth lines of fine to medium coarseness and undulating slightly in immature part of shell and more strongly in mature part; no longitudinal folds or growth lines; spines absent from flanks, may be present on carina of mature part of shell. |