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Rhombopteria perunicola
Taxonomy
Rhombopteria perunicola was named by Kříž (2008). Its type specimen is JK 11517, a shell (left valve), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2008 | Rhombopteria perunicola Kříž pp. 255 – 256 figs. 6N–Q, 7A–G |
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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.
†Rhombopteria perunicola Kříž 2008
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Kříž 2008 | Dorso-ventrally elongated Rhombopteria. Shell subrhombic to subovoid in outline,
dorsoventrally elongated, inequivalved. Right valve is almost flat, inequilateral, moderately prosocline, umbo small with prosogyrate beak, auricular buttresses slightly developed anteriorly and posteriorly of umbo. Left valve is inequilateral, moderately prosocline to opisthocline, variably inflated (L/W = 1.79–2.83, H/W = 2.20–3.7), with dorsal margin straight, auricular sulci absent, anterior and posterior auricles merging into body of shell without interruption. Umbo large, prosogyrate. Anterior auricle is relatively small, lobate. Posterior auricle larger, wing like. Antero-ventral, ventral and postero-ventral margins evenly rounded. Commissure lies within a single plane except in anterior margin where it is concave on the left valve and convex on the right valve. Anterior slope of the left valve is steeper than posterior slope. Outer surface sculpture consists of wide, flat growth bands in combination with two sets of fine radial costellae or papillae arranged in quincunx. Inner surface smooth with weak, wide growth band and furrows. Large posterior adductor muscle scar (Fig. 7D) connected by pallial line with smaller anterior adductor muscle scar developed close to the umbo (Fig. 7G), pedal retractor muscle scars developed on right valve close to dorsal margin (Fig. 7G). Ligament area low, ligament duplivincular, with ligament grooves inclined to hinge axis with bent beneath the umbo. Teeth in central part of the hinge most probably absent as in the representative of Rhombopteriidae mentioned and figured by Johnston (1991, p. 305, fig. 7C, D). Shell wall thickness is 0.3 mm. |