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Mabella semiovalis
Taxonomy
Leptellina (Mabella) semiovalis was named by Klenina (1984). Its type specimen is IGNA 411/79, a valve (conjoined valves), and it is a 3D body fossil.
It was recombined as Mabella semiovalis by Popov and Cocks (2014).
It was recombined as Mabella semiovalis by Popov and Cocks (2014).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1984 | Leptellina (Mabella) semiovalis Klenina p. 69 figs. pl. 5, figs 1, 3, 4, pl. 9, figs 4, 7 |
| 1984 | Leptellina (Mabella) obtusa Klenina p. 71 figs. pl. 5, figs 5, 6, pl. 6, fig. 2 |
| 1984 | Leptellina (Mabella) incurvata Klenina p. 72 figs. pl. 5, fig. 2 |
| 2014 | Mabella semiovalis Popov and Cocks pp. 715 - 716 figs. 14F–H, J–T |
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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.
†Mabella semiovalis Klenina 1984
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Invalid names: Mabella incurvata Klenina 1984 [synonym], Mabella obtusa Klenina 1984 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. E. Popov and L. R. M. Cocks 2014 | Shell concavoconvex to almost planoconvex, transverse semioval in outline, with maximum width at hinge line. Cardinal extremities acute and slightly alate; anterior commissure rectimarginate. Ventral valve strongly convex in transverse and lateral profiles with maximum thickness slightly posterior to mid-length. Ventral interarea planar, strongly apsacline to almost orthocline, with a small, convex pseudodeltidium. Dorsal valve gently concave to almost flat, with a planar, anacline to procline interarea and disjunct chilidial plates. Radial ornament finely and unequally parvicostellate, with 5 to 6 accentuated ribs per 3 mm along the anterior margin of mature specimens and up to 7 very fine parvicostellae in the interspaces. Ventral interior with strong teeth lacking dental plates. Ventral muscle field cordate with small adductor scars strongly impressed in the umbonal area, and completely surrounded by diductor muscle scars, bisected by a median ridge in front of the diductor scars. Mantle canals saccate with divergent vascula media bifurcating at a short distance from the ventral muscle field. Dorsal interior with a low, trifid cardinal process facing posteriorly, and straight, widely divergent socket ridges. Lophophore platform occupying almost 90% of valve length, bordered by a high, medially divided rim. Median septum tubular anteriorly, not merging with a rim in juvenile specimens, becoming bifurcated and adjoined with the rim in mature specimens. |