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Manespira costata
Taxonomy
Protozyga costata was named by Cooper (1956). Its type specimen is USNM 117239c and is a 3D body fossil.
It was recombined as Manespira costata by Copper (1986).
It was recombined as Manespira costata by Copper (1986).
Synonymy list
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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.
†Manespira costata Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Small, oval in outline with the length greater than the width; widest at the middle ; valves unequal, the pedicle valve having a greater depth than the brachial valve ; apical angle 100° ; sides rounded ; anterior margin rounded to subnasute; anterior commissure faintly sulcate; surface paucicostate, 2 costae in the sulcus (rarely 3), 3 costae on the fold (rarely 4), and 4 costae on the flanks; costae usually not extending for more than two-thirds the length from the margin.
Pedicle valve strongly convex in lateral profile with the maximum convexity in the posterior half ; anterior commissure somewhat narrowly convex and with long, steep lateral slopes. Umbo narrowly convex; median region narrowly inflated; anterior third marked by a low, poorly defined fold. Brachial valve shallow, gently convex in lateral profile ; anterior profile barely concave to broadly and gently convex ; umbonal region broadly and gently convex; sulcus narrow and shallow, originating near the middle and almost completely filled by 2 costae. Sulcus shallow throughout its length. Flanks gently inflated. Spire as described for the genus. |
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 | |||||
Age range: Blackriveran or 457.30000 to 449.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Blackriveran | USA (Oklahoma) | Protozyga costata (23893) |