| Zetela praetextilis | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Solariellidae |
| Genus: | Zetela |
| Species: | †Z. praetextilis |
| Binomial name | |
| †Zetela praetextilis (Suter, 1917) | |
| Synonyms[1] | |
|
Solariella praetextilis Suter, 1917 | |
Zetela praetextilis is an extinct species of sea snail, a marine gastropod mollusk, in the family Solariellidae.[1] This species occurs in New Zealand.[1]
Description
The small, thin shell is conoidal and very moderately umbilicated. It shows oblique axial riblets on the upper whorls, reduced to gemmules upon the spiral lirae on the lower whorls.
Sculpture: The protoconch is spirally striated, the succeeding two or three whorls show oblique, retractive, fine axial riblets, about 30 on a whorl, which are present on the lower whorls only below the suture, but farther down by round gemmules upon the spiral threads, which number 6 on the penultimate whorl. On the body whorl there are 2 stronger and a little more distant spirals at the periphery, rendering it faintly bicarinate. On the base there are 1 or 2 fine spiral threads below the periphery, the space between them and the umbilicus bearing fine radial riblets. The umbilicus is margined by a strongly gemmate ridge, followed by a much finer one inside the umbilicus. The spire conoidal, a little lower than the height of the aperture. The protoconch is small, convex, with a few spirals. The shell contains 4½ convex whorls. The body whorl is faintly bicarinate, the base flatly convex. The suture is canaliculate. The aperture is hidden by the matrix. The deep umbilicus is moderate, not quite one-third of the greatest diameter.[2]
References
- 1 2 3 MolluscaBase (2018). Zetela praetextilis (Suter, 1917) †. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=830223 on 2018-12-28
- ↑ Suter, H. (1917). Descriptions of new Tertiary Mollusca occurring in New Zealand, accompanied by a few notes on necessary changes in nomenclature. New Zealand Geological Survey Paleontological Bulletin. 5: i-vi, 1-93
- Maxwell, P. A. (2009). Cenozoic Mollusca. pp 232–254 in Gordon, D. P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.