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Cancellaria (Bivetopsia) herberti
Taxonomy
Cancellaria (Bivetopsia) herberti was named by Landau et al. (2007). Its type specimen is MOBRM- 3419, a shell, and it is a 3D body fossil. Its type locality is Cantaure Formation (unspecified localities), which is in a Burdigalian transition zone/lower shoreface siliciclastic in the Cantaure Formation of Venezuela.
Sister species lacking formal opinion data
C. acuta, C. ancycla, C. bifasciata, C. bifasciatum, C. contorta, C. druidarum, C. eucheea, C. euclethra, C. hartti, C. mitrodita, C. paramoorei, C. picta, C. pirabensis, C. praeindentata, C. pristina, C. sanctifrancisci, C. spherotopleura, C. springvalenensis, C. stibara, C. subtilicancellata, C. tritonoidea, C. waltoniana, C. yonabaruensis, C. zitteli, C. peninsularis, C. decussata, C. crassidiformis, C. atraktoides, C. sphenoidostoma
Synonymy list
| Year | Name and author |
|---|---|
| 2007 | Cancellaria (Bivetopsia) herberti Landau et al. figs. figs. 23-25 |
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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.
†Cancellaria (Bivetopsia) herberti Landau et al. 2007
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. Landau et al. 2007 | Shell small, solid, ovate, squat, with a predominantly axial sculpture. Protoconch consists of about three and a half smooth, strongly convex whorls, with a small nucleus. Junction with teleoconch sharply delimited by a prosocline scar. Teleoconch consists of three and a half convexwhorls, with the periphery at the abapical suture. Suture deeply impressed and undulating. Sculpture on the first teleoconch whorl somewhat eroded. Second teleoconch whorl bears 12 prosocline axial ribs, of very irregular strength, about half the width of their interspaces. Last whorl bears eight, every second or third rib thickened into a varix. Spiral sculpture consists of six narrow, elevated spiral cords on the first and second whorls, with secondary threads intercalated towards the end of the second whorl. Last whorl with 12 primary spiral cords, secondary threads in some, but not all interspaces, some of the primary cords mid-whorl weakly bifid. On the last whorl the sculptural intersections at the shoulder are developed into small, horizontally-elongated, adapically-pointing rounded tubercles, giving the whorl a somewhat shouldered appearance. Whorl surface covered in prosocline growth lamellae, giving the shell a somewhat scabrous appearance. Last whorl globose, squat, moderately constricted behind the fasciole. Aperture approximately 60% of total height, sub-oval and elongate. Outer lip thickened by a broad labial varix, flared abapically, prosocline in profile and angled at the rather narrow, but distinct stromboid notch. Lip with a crenulated edge, strongly and deeply lirate within, 13 lirae, the abapical lirae ending almost at the lip edge in a slightly thickened denticle. Columella bears three non-bifid folds, the adapical fold largest. Columellar and parietal calluses strongly thickened, sharply delimited, moderately expanded and adherent onto the ventral aspect of the lastwhorl. The entire callus is covered in numerous irregular folds and tubercles. Siphonal canal damaged. Siphonal fasciole well developed, rounded and elevated, bearing six cords. Umbilical chink present, of average size for genus. |