Agladrillia nakazaense
| Agladrillia nakazaense | |
|---|---|
| |
| Shell of Agladrillia nakazaense (holotype) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Family: | Drilliidae |
| Genus: | Agladrillia |
| Species: | †A. nakazaense
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| Binomial name | |
| †Agladrillia nakazaense MacNeil, 1961
| |
Agladrillia nakazaense is an extinct species of sea snail, a marine gastropod mollusk in the family Drilliidae.[1]
Description
[edit]The length of the shell attains 17 mm (0.67 in), its diameter 6.4 mm (0.25 in).[citation needed]
(Original description) The shell is medium to moderately inflated with rounded whorls.[citation needed] The protoconch is missing in the type specimen. The aperture is less than half the length of the shell and extends anteriorly to form a short, well-defined siphonal canal. The parietal callus is thin except for a small bulge adjacent to the anal sinus.
The sculpture consists of moderately heavy axial ribs, about 5 to 6 visible from an angle, crossed by narrow but sharp raised threads.[citation needed] These threads are somewhat narrower on the subsutural slope and often have secondary threads on the lower part of the columella.[citation needed] The anal fasciole is not distinct because the axial ribs reach nearly to the subsutural collar, and the collar dips gently between the axial ribs.[2]
Distribution
[edit]This extinct marine species was found in Miocene or Pliocene strata on Okinawa, Japan.[1]
References
[edit]- ^ a b Agladrillia nakazaense MacNeil, 1961. 27 June 2024. Retrieved through: World Register of Marine Species.
- ^ MacNeil, F.S. (1961). "Tertiary and Quaternary Gastropoda of Okinawa" (PDF). U. S. Geological Survey Professional Paper. (339): 1–148. Retrieved 27 June 2024.
This article incorporates text from this source, which is in the public domain.