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Leptoptygma gremechaensis
Taxonomy
Leptoptygma gremechaensis was named by Mazaev (2015). Its type specimen is PIN 4919/6-359, a shell, and it is a mold. Its type locality is Kremeshki Quarry, locality 4919/6, Sovetsk, which is in a Roadian open shallow subtidal grainstone in the Russian Federation.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Leptoptygma gremechaensis Mazaev pp. 974 - 976 figs. pl. 36 f. 10 |
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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.
†Leptoptygma gremechaensis Mazaev 2015
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. V. Mazaev 2015 | The shell is medium-sized and subulitid, consisting of approximately six rapidly expanding whorls. The ratio of the shell height to its maximum diameter is about 1.37. The spire outline is straight. The pleural angle is 75°. The aperture height is less than the maximum shell diameter. The shell diameter to the aperture height ratio is 1.2. The suture is very thin and depressed. The whorl surfaces are dis tinctly convex and smooth. The aperture is relatively wide. The ratio of the aperture height to its width is 1.5. The umbilicus is absent. The columella is massive, weakly corkscrewlike. Its height is almost half of the aperture height. The columellar fold is absent. The growth lines are not preserved. |