Mauidrillia trispiralis
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| Mauidrillia trispiralis Temporal range: | |
|---|---|
 | |
| Holotype from Auckland War Memorial Museum | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Family: | Horaiclavidae |
| Genus: | Mauidrillia |
| Species: | †M. trispiralis |
| Binomial name | |
| †Mauidrillia trispiralis A. W. B. Powell, 1944 | |
Mauidrillia trispiralis is an extinct species of sea snail, a marine gastropod mollusc in the family Horaiclavidae.[1] Fossils of the species date to the middle Miocene strata of the Otway Basin of Victoria, Australia.
In the original description, Powell described the species as follows:
Shell very slender, sculptured with relatively few strong spirals which are rendered nodulose at the axial intersections. Subsutural fold strong, 2 to 3 threads on shoulder ; peripheral carina and two cords below it, all equally strong. About 19 cords on body-whorl from periphery to the anterior end. The holotype exhibits abnormal sculpture on the front of the body-whorl, due to a shell injury and its subsequent repair. Axials 13 per whorl, producing nodulation where they cross the three main spirals. Body-whorl crossed by numerous axial riblets which render the spirals weakly crenulate. The absence of strong axial nodulation on the body-whorl may be due to the shell injury already mentioned.[2]
The holotype of the species measures 9.9 mm (0.39 in) in height and 3.5 mm (0.14 in) in diameter.[2]