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Cyrtonotella grandistriata
Taxonomy
Cyrtonotella grandistriata was named by Cooper (1956). Its type specimen is USNM 109857, a valve (pedicle valve ), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Cyrtonotella grandistriata Cooper pp. 321 - 322 figs. Plate 39, D, figures 16-19 |
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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.
†Cyrtonotella grandistriata Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell large for the genus, wider than long and with the hinge forming the greatest width. Cardinal extremities acute, alate. Lateral margins sloping medially; anterior margin broadly rounded. Surface multicostellate, costellae high and narrowly rounded, appearing in 4 generations by implantation and bifurcation. Primary and secondary costellae the stronger and tending to group the ternary and quaternary costellae into fairly well marked fascicles.
Pedicle valve strongly convex in lateral profile in the posterior half, gently convex in the anterior half. Anterior profile broadly convex with the median part the most convex. Umbonal region moderately convex, but the region just anterior to the umbo swollen and the valve somewhat inflated nearly to the front margin along the median line. Slopes to cardinal extremities steep, those to the anterior and anterolateral margins less steep. Brachial valve moderately concave in lateral profile; umbonal region slightly convex. Posterior to the middle the valve becomes moderately concave, and this portion is the most concave part. Flanks slightly convex and cardinal extremities flattened. Pedicle interior with widely flaring dental plates ; brachial interior with short and small brachiophores, small cardinal process. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||