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Trilemma
Taxonomy
Trilemma was named by Blagovetshenskiy and Shumilkin (2006). Its type is Aporrhais striatocarinata.
It was assigned to Aporrhainae by Kollmann (2009); and to Aporrhaidae by Blagovetshenskiy and Shumilkin (2006) and Blagovetshenskiy and Shumilkin (2012).
It was assigned to Aporrhainae by Kollmann (2009); and to Aporrhaidae by Blagovetshenskiy and Shumilkin (2006) and Blagovetshenskiy and Shumilkin (2012).
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Trilemma Blagovetshenskiy and Shumilkin pp. 38 - 39 |
| 2009 | Trilemna Kollmann p. 51 |
| 2012 | Trilemma Blagovetshenskiy and Shumilkin p. 345 |
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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. †Trilemma Blagovetshenskiy and Shumilkin 2006
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†Trilemma arrialoorense Stolizcka 1867
†Trilemma bicarinatoides Wollemann 1903
†Trilemma kremenkense Blagovetshenskiy and Shumilkin 2012
†Trilemma polivnense Blagovetshenskiy and Shumilkin 2012
†Trilemma russiense Blagovetshenskiy and Shumilkin 2006
†Trilemma striatocarinatum Sinzow 1880
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| I. V. Blagovetshenskiy and I. A. Shumilkin 2006 | Fusiform shells of medium size, with bicarinate whorls, smooth (not tuberculate) carinae, and poorly developed axial ornamentation. Aperture with robust, downwardly curved rostrum. Winglike extension of palatal margin of aperture with three sickle-shaped processes of narrowly elongated or, more rarely, broadly elongated, flattened shape. Posterior process and adapical spire whorls coalesced to a greater or lesser extent. |