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Ancistrorhyncha costata
Taxonomy
Ancistrorhyncha costata was named by Ulrich and Cooper (1942). Its type specimen is USNM 108203, a shell, and it is a 3D body fossil. It is the type species of Ancistrorhyncha.
Synonymy list
| Year | Name and author |
|---|---|
| 1942 | Ancistrorhyncha costata Ulrich and Cooper p. 625 figs. pl. 90, figs. 25-27, 30, 31 |
| 1956 | Ancistrorhyncha costata Cooper pp. 621 - 623 figs. Plate 126, B, figures 6-9; plate 127, H, figures 47-52; plate 127, J, figures 58-62; plate 129, A, f |
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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.
†Ancistrorhyncha costata Ulrich and Cooper 1942
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell small, valves subequal in depth, subtriangular to subpentagonal in outline; beak slightly greater than a right angle ; sides diverging and straight from beak to about the middle where the shell attains its maximum width, sides rounded at middle; front margin truncated. Surface marked by low, rounded costae separated by spaces narrower than the costae. The sulcus is marked by 6 to 10 costae, the fold by 7 to 11 costae, and the flanks bear about 13 ribs.
Pedicle valve moderately convex in lateral profile with the greatest convexity located in the timiid posterior half. Sulcus originating at about the middle, shallow, with a short, narrowly rounded tongue ; sulcus occupying as much as half the width at the front. Flanks fairly strongly roimded and with moderately steep slopes. Brachial valve moderately convex in lateral profile and with the maximum curvature at about the middle ; anterior profile fairly strongly rounded. Umbonal and median regions swollen; fold originating slightly anterior to the middle, low in most specimens and in some scarcely distinguishable. Flanks moderately rounded and with moderately steep slopes. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Hendy 2009, Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: Ashbyan or 457.30000 to 449.60000 Ma
Collections (15 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Caradoc | USA (Georgia) | Ancistrorhyncha costata (32456 32457 32458 32779 32783 32787 32791 32798 32880 32881 32882 33065) | |
| Ashbyan | USA (Tennessee) | Ancistrorhyncha costata (164924) | |
| Blackriveran | USA (Tennessee) | Protorhyncha ridleyana (5329) | |
| Blackriveran | USA (Oklahoma) | Ancistrorhyncha costata (23895) |