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Agladrillia nakazaense

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Agladrillia nakazaense
Shell of Agladrillia nakazaense (holotype)
Scientific classification Edit this 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]

Description

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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

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This extinct marine species was found in Miocene or Pliocene strata on Okinawa, Japan.[1]

References

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  1. ^ a b Agladrillia nakazaense MacNeil, 1961. 27 June 2024. Retrieved through: World Register of Marine Species.
  2. ^ MacNeil, F.S. (1961). "Tertiary and Quaternary Gastropoda of Okinawa" (PDF). U. S. Geological Survey Professional Paper. (339): 1–148. Retrieved 27 June 2024. Public Domain This article incorporates text from this source, which is in the public domain.