| Douglassia minervaensis | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Superfamily: | Conoidea |
| Family: | Drilliidae |
| Genus: | Douglassia |
| Species: | D. minervaensis |
| Binomial name | |
| Douglassia minervaensis Fallon, 2016 | |
Douglassia minervaensis is a species of sea snail, a marine gastropod mollusc in the family Drilliidae. [1]
The size of an adult shell attains 7.5 mm.
 | This section needs expansion. You can help by adding to it. (August 2016) |
The shell is very small, reaching up to 7.9 mm total length, glossy, and fusiform with a truncated anterior. [2] It has up to 8½ whorls; the last is large (about 59% of total length) and asymmetric, the right side is swollen by a cup-handle-like varix positioned behind the anal sinus about one-quarter turn from the outer lip, giving a lopsided ventral view. [2] The protoconch consists of about 2¾ smooth whorls, the first partly immersed in the second. [2] Early teleoconch whorls bear broad, low ribs; the last two carry high, narrow ribs. [2] On the last whorl, bold axial ribs extend to the anterior fasciole but are strongly reduced or absent within a narrow, concave sulcus. Ribs are narrower than the interspaces, number 7–8 on the penultimate whorl and 6 on the last to the varix, and have acute crests. Growth striae are microscopic. [2] The sulcus is concave and narrow, with broad, low rib remnants to the suture and recurved striae reflecting the anal sinus. [2]
The spiral sculpture consists of 6–8 faint threads on the shell base and 6–8 faint threads on the anterior fasciole. [2] The outer lip is thin, projects slightly, and is mostly missing in the holotype; a stromboid notch is unknown. [2] The anal sinus lies on the whorl shoulder and has a rounded apex. [2] The inner lip is moderately wide, margined, thicker anteriorly, thinnest on the parietal wall, and forms a posterior lobe at the anal sinus. [2] The anterior canal is straight, short, and open, without a notch; the anterior fasciole is not swollen. [2] The Colour of the Douglassia minervaensis is a uniform light golden brown with a lighter, narrow peripheral spiral band, and white on the rib-shoulder crests. [2]
This species occurs in the demersal zone of the Western Atlantic Ocean off Bahia, Brazil.