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Tolmachovia sublirata
Taxonomy
Tolmachovia sublirata was named by Ebbestad et al. (2017). Its type specimen is RGM.1332175 and is a mold. Its type locality is Zwolle, which is in an Idavere/Johvi carbonate chert in the Haljala Erratics Formation of the Netherlands.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Tolmachovia sublirata Ebbestad et al. pp. 410 - 411 fig. 4 |
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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.
†Tolmachovia sublirata Ebbestad et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. O. R. Ebbestad et al. 2017 | A small species of Tolmachovia with fine radial ornamentation between the pronounced, upturned lamellar ribs on larger part of conch.
Shell small, length 9mm (estimated), height 6.5 mm (estimated), width 4.2 mm. Shell posterior to vertical axis unknown (Fig. 4A). Body broadly rounded with max width at periphery halfway along the vertical axis, tapering ventrally while gently rounded dorsally (Fig. 4D). Protoconch (internal cast protruding through shell) narrowly conical, pointed, with tip slightly curved anteriorly. Shell along dorsal axis slopes gently down anteriorly and posteriorly from the umbo with thin, sharp hinge line (Fig. 4B). Snout thin (~ 1 mm wide in dorsal view) and crest-like. Preserved ventral margin of snout and body suggest broadly arcuate ventral margin. Anterior and ventral gapes slit-like and continuous, with fine denticles developed opposite each other along the ventral commissural margins (Fig. 4E). Ornamentation consist of densely spaced comarginal lamellar ribs, 5–6 lamellae per mm (measured along the vertical axis), curving slightly upward. At the lower part of the shell, about 1mmfrom the ventral margin in a ca 1mmbroad band on both sides of the conch the comarginal lamella are thinner and more densely spaced (Fig. 4A, D). Sub-ordinate, regularly spaced radial lirae are developed in the spaces between the lamellae, discernible at least on the main part of the body above the band of finer lamellae (Fig. 4A, C). Interior of shell unknown. |