Zelandiscus worthyi
| Zelandiscus worthyi | ||||||||||||
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| Scientific name | ||||||||||||
| Zelandiscus worthyi | ||||||||||||
| Climo , 1989 |
Zelandiscus worthyi is an extinct land snail species that was found on the South Island of New Zealand . It is known only from the holotype, a subfossil housing, which the New Zealand paleozoologist Trevor H. Worthy had unearthed in February 1984 in the soil deposits of the Aurora Cave near Lake Te Anau . Together with the species Zelandiscus elevata ,discovered in 1977, it forms the genus Zelandiscus .
features
The monochrome gray case has a diameter of 2.46 cm and a height of 1.73 cm. The surface is worn flat. There are 4.75 turns. The protoconch (embryonic thread) consists of 1.75 turns. There are 68 ribs on the body thread. There are 37 ribs on the first Teleoconch turn. The edge of the case is flat. The upper shell seam is deep and not furrowed. The primary axial ribs are descending in and above the seam. They do not end at the suture edge. There are no mouth barriers. The spindle wall and the base of the palate wall are greatly thickened. This thickened area, which extends continuously back to the spindle, consists of a deep navel-shaped suture. The umbilicus (navel) is wide and open.
literature
- Climo, Frank M. (1989). The panbiogeography of New Zealand as illuminated by the genus Fectola Iredale, 1915 and subfamily Rotadiscinae Pilsbry, 1927 (Mollusca: Pulmonata: Punctoidea: Charopidae) . In: New Zealand Journal of Zoology 16 (4): p. 587-649.