| 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 |
| Binomial name | |
| †Agladrillia nakazaense MacNeil, 1961 | |
Agladrillia nakazaense is an extinct species of sea snail, a marine gastropod mollusk in the family Drilliidae. [1]
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]
This extinct marine species was found in Miocene or Pliocene strata on Okinawa, Japan. [1]
This article incorporates text from this source, which is in the public domain .