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Retispira concinna
Taxonomy
Bucaniopsis concinnus was named by Weir (1931) [paratype designated by Peel (2016)]. Its type specimen is LL 250, a shell, and it is a 3D body fossil.
It was recombined as Retispira concinna by Peel (2016).
It was recombined as Retispira concinna by Peel (2016).
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.
†Retispira concinna Weir 1931
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. S. Peel 2016 | Species of Retispira with convex dorsum arched at raised median selenizone; rate of whorl expansion, measured as the ratio of the width of consecutive whorls (Fig. 6K), of about three, with maximum whorl width low on the whorl cross-section, near the open umbilici (Fig. 6K). Whorl width increasing to equal length in mature specimens. Aperture sub-planar with straight or even shallowly concave dorso-lateral margins (Fig. 6F) passing via shallow sinus into short, broad, median slit which generates a raised, convex, selenizone ornamented with numerous spiral cords crossed by shallow growth lines (Fig. 6A, B, E). Ornamentation dominated by spiral cords of several size orders, crossed by growth lines to form a fine reticulation which is finely nodose at intersections. Additional spiral cords introduced as fine threads between pre-existing spiral elements. Growth lines may be periodically thicker and accompanied by slight comarginal folding on the dorsum (Fig. 6B), but only weakly expressed in the latest growth stages of larger specimens (Fig. 6E). |