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Angyomphalus congletonensis
Taxonomy
Angyomphalus congletonensis was named by Peel (2016) [? = Raphistoma radians Hind in Stobbs & Hind 1905 p. 532, pl. 35, fig. 8a, b.]. Its type specimen is PMU 29731, a shell, and it is a 3D body fossil. Its type locality is Pot Bank Quarry Locality 3, Congleton Edge, which is in an Alportian carbonate mudstone in the Morridge Formation of the United Kingdom.
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Angyomphalus congletonensis Peel pp. 420 - 421 fig. 8 |
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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.
†Angyomphalus congletonensis Peel 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. S. Peel 2016 | Species of Angyomphalus morphologically close to the type species but differing in that the sub-sutural comarginal nodes are more widely spaced and shorter, extending radially across 10–15% of the upper whorl surface of the final whorl when compared to 25% in the type species.
Species with about seven whorls and height about 45% of maximum width. Lenticular, with open umbilicus about one-fifth of width (Fig. 8H). Initial whorls protuberant, consisting of about two smooth whorls with convex upper whorl surface, thereafter with decreasing convexity until only shallowly convex, shouldered below incised sutures when sub-sutural comarginal nodes appear at about three and a half whorls (Fig. 8G, J). In later growth stages the upper whorl surface may be shallowly concave just above the selenizone. Outer lip prosocline, as indicated by growth lines that are steeply inclined, almost perpendicular to the suture, before sweeping regularly backwards into the short slit which generates an obscure selenizone bounded only by fine threads (Fig. 8A, F, arrows). Lower margin of selenizone lying at whorl periphery, its surface ornamented by fine, concave, lunulae (Fig. 8A). Apertural margin strongly prosocyrt below peripheral selenizone, curving strongly backwards to the angulation forming the junction between the base and the umbilical wall; umbilical wall thin (Fig. 8I, arrow). A short funicle developed on the umbilical shoulder slightly restricts the open umbilicus and may generate a circumbilical fasciole in some specimens (Fig. 8D, funicle arrowed). Ornamentation of fine growth lines and a prominent sub-sutural band of comarginal tubercles. The tubercles extend for 10–15% of the width of the upper whorl surface (Fig. 8B, C) and are separated by interspaces which are almost as wide as the radial length of the tubercles themselves. |
Measurements
No measurements are available
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| Source: f = family, o = order | |||||
| References: Hendy 2009, Bambach et al. 2007 | |||||