Stromboidea
Type species: by original designation, Tundora tuberculata Stephenson, 1941:313
Original Diagnosis of Tundora by Stephenson, 1941, p. 313:
- "This new genus is a small, rotund shell with a low spire, a small, low protoconch, and a rapidly expanding conch. The ornamentation on the uncallused shell consists of narrow to sharp spirals separated by proportionally wide flat.bottomed interspaces in which the incrementals appear as sharp, closely spaced lines. Axials are wanting. In the adult the entire shell is covered with a proportionally thick coating of callus consisting of 2 or more layers. A remarkable peculiarity of this coating is the development over much of its surface of low, round-topped tubercles, most of which are aligned in rows surmounting the concealed spirals; however, scattered nodes are present in the interspaces and nodes are absent on the parietal wall in the vicinity of the aperture, and also on the higher parts of the spire. In one meridian of the spire the callus is folded up to form a narrow, prominent axial ridge which extends up to and over the apex, somewhat as in Calyptraphorus. The four available shells of Tundora tuberculata are all incomplete but the holotype reveals the beginning of an expanded outer lip of undetermined extent. The columella is smooth and the aperture is elongated and terminates acutely at the rear; one of the paratypes shows a narrow anal canal impressed in the callus and extending well up on the side of the penultimate whorl. The anterior canal is narrow, recurved and is probably short. The family relationship of this species is not certainly known, but it appears to be a member of the Strombidae."
Tundora species are
might belong to this genus
Etymology: by anagram from rotunda.
Gender: feminine
History and Synonymy
2007
Bandel, 2007
p.120:
- 2.6 Family Pugnellidae KIEL & BANDEL, 1999
p. 123:
- The type species is Tundora tuberculata STEPHENSON, 1941 as illustrated by DOCKERY (1993: pl. 27, figs. 1–2, pl. 40, figs. 1–2) from Ripley Formation (Campanian-Maastrichtian).
- Diagnostic characters: The ovoid shell with low spire has ornament of its whorls with numerous spiral ribs. The body whorls has three spine-like grooved projections of the outer lip, the two spines with spiral keels ending on them, and the third representing the siphon. A callus ridge in the continuation of the posterior edge of the oute rlip. The inner lip is expanded to form a callus with a marginal ridge that covers the inner side of the shell including its apex.
- Difference: The short and wide spire resembles that of Tessarolax and Pterocerella, but spiral ornament on rounded whorls and callus of the inner lip forming a marginally thickened pad that covers the shell to the spire is quite distinctive to Tundora.
2009
Kollmann, 2009, p. 54:
- "Tundora Stephenson possesses a sculpture of strong nodes. The whorls are convex (Stephenson 1941; Sohl 1964) to indistinct bi-angular (Dockery 1993). It is closely related or identical with Tessarolax Gabb, 1868."
