Kingdom Animalia Clade Caenogastropoda Clade Neogastropoda Phylum Mollusca | Class Gastropoda Clade Hypsogastropoda Superfamily Conoidea Rank Genus | |
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Microdrillia is a genus of very small sea snails, marine gastropod mollusks in the family Borsoniidae.
Contents
Description
The species in this genus are characterized by a well-developed, multispiral, closely coiled protoconch. One to three of its basal whorls are costulate. The body whorl is wholly devoid of costae but spirally carinate. The retral sinus is relatively large, circularly rounded and close to the suture. The aperture is oblique. The columella is callous, with or without plications. The siphonal canal is short or subobsolete.
The following species of this genus are also found as fossils in the age range of 48.6 Ma to 0.781 Ma: Microdrillia comatotropis, Microdrillia cossmanni, Microdrillia crispata, Microdrillia harrisi, Microdrillia ouchitae, Microdrillia propetrina, Microdrillia tersa, Microdrillia trina
Distribution
This marine genus occurs in the Gulf of Oman, off South Africa and off Australia (New South Wales, Queensland).