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Transitrigonia
Taxonomy
Transitrigonia was named by Dietrich (1933).
It was synonymized subjectively with Yaadia by Cox (1952); it was reranked as Steinmanella (Transitrigonia) by Leanza (1993).
It was assigned to Steinmanella by Leanza (1993); and to Steinmanellinae by Cooper and Leanza (2017).
It was synonymized subjectively with Yaadia by Cox (1952); it was reranked as Steinmanella (Transitrigonia) by Leanza (1993).
It was assigned to Steinmanella by Leanza (1993); and to Steinmanellinae by Cooper and Leanza (2017).
Synonymy list
| Year | Name and author |
|---|---|
| 1933 | Transitrigonia Dietrich |
| 1993 | Steinmanella (Transitrigonia) Leanza pp. 40-41 |
| 2017 | Transitrigonia Cooper and Leanza |
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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. †Transitrigonia Dietrich 1933
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†Steinmanella (Transitrigonia) quintucoensis Weaver 1931
†Transitrigonia transitoria Steinmann 1881
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. A. Leanza 1993 | Shell large, ovate to subquadrate. Flank ornamented by evenly spaced, tuberculate, concave costae. Area ornamented by transversely elongated tubercles in the proximal portion, and by transverse costae or rugae in its mid- and distal part. These may well cross onto the upper part of the posterior flank. Marginal and escutcheon carinae mostly defined in the umbonal region by rows of tubercles, then indistinct. Escutcheon mostly ornamented with the same pattern as found on the area (Dietrich, 1933; Saveliev, 1958; Camacho and Olivero, 1985). |