Subonoba morioria
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| Subonoba morioria | |
|---|---|
 | |
| Holotype from the Auckland War Memorial Museum | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Subonoba |
| Species: | S. morioria |
| Binomial name | |
| Subonoba morioria A. W. B. Powell, 1933 | |
| Synonyms[1][2] | |
| |
Subonoba morioria is a species of sea snail, a marine gastropod mollusc in the family Rissoidae.[1] It is endemic to the waters surrounding the Chatham Islands of New Zealand.
In the original description, Powell described the species as follows:
Shell small, ovate, thin, fragile, white and translucent. Whorls 41⁄2, including a bluntly rounded protoconch of 11⁄2 smooth whorls. Spire tall, about l1⁄4 times height of aperture. The sculpture consists of numerous fine and closely spaced spiral lirae, 9 on the penultimate whorl, and 14 on the body-whorl and base. The interspaces are mostly about half the width of the lirae, but those near to the upper suture are wider and equal to the width of the lirae. Aperture ovate, peristome continuous. Outer-lip with a shallow sinus above and inclined forwards slightly below.[3]
The shells of the species measure 1.9 mm (0.075 in) in height and 1.0 mm (0.039 in) in diameter.[4] It differs from S. foveauxiana in shape, and from S. fumata by having stronger spirals, a shorter spire, and a more inflated body-whorl (nine on the penultimate and 14 across the body-whorl and base).[3][5]
