| Emarginula salebrosa | |
|---|---|
| |
| Shell of Emarginula salebrosa (holotype) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Lepetellida |
| Family: | Fissurellidae |
| Subfamily: | Emarginulinae |
| Genus: | Emarginula |
| Species: | E. salebrosa |
| Binomial name | |
| Emarginula salebrosa D. G. Herbert, 2024 | |
Emarginula salebrosa is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets and slit limpets.
Description
(Original description)
- Dimensions: Holotype, base 7.0 × 5.4 mm, height 4.4 mm; largest specimen, base 8.4 × 6.0 mm, height 4.7 mm.
- Shell Characteristics
- Size & Thickness: Small, with a basal length up to 8.4 mm, and notably thick.
- Shape & Profile:
- Apex: Strongly recurved, extending slightly beyond the posterior margin of the base in some specimens, though not reaching it in others.
- Dorsal Profile: Strongly convex.
- Basal Outline: Broadly ovate, with a length-to-width ratio (L/W) of 1.3–1.4, appearing flat or slightly concave in side view.
- Height: Moderate, with a height-to-length ratio (H/L) between 0.56 and 0.63.
- Slope & Face:
- Anterior Slope: Humped in side view; anterior face slightly flattened on either side of the slit.
- Posterior Slope: Almost straight and steeply inclined in larger specimens, less so in smaller ones.
- Protoconch: Generally tucked beneath the apex but often missing; somewhat eroded in available specimens, typically emarginuliform with traces of irregular granulation and a diameter of about 140 μm.
- Sculpture & Texture:
- Anterior Slit: Narrow and moderately deep, extending roughly one-third down the anterior slope.
- Selenizone: Initially forms a low mid-line rib with coarse lunulae, diminishing in prominence with growth and becoming weaker than neighboring primary ribs.
- Radial Sculpture: Coarsely cancellate, with 14–16 primary radial ribs, narrower secondary ribs between them, and occasional tertiary ribs near the basal margin.
- Concentric Ridges: Cross the radial ribs, equal in strength to secondary ribs, creating strong nodules at intersections.
- Interstices: Rounded, quadrate depressions with single or paired intritacalx pits.
- Basal Margin: Coarsely crenulated by the ends of the radial ribs.
- Interior: Features a broad, thickened ridge underlying the selenizone; the apex is visible from the interior.
- Coloration: Juvenile specimens are uniformly white, while larger shells tend to appear dirty white.
Distribution
This marine species occurs on the Walters Shoals, a group of submerged mountains off the coast of Madagascar.
References
- Emarginula salebrosaD. G. Herbert, 2024. Retrieved through: World Register of Marine Species on 6 November 2024.
- Herbert, D.G. (2024). "The Vetigastropoda (Mollusca) of Walters Shoal, with descriptions of two new genera and thirty new species". European Journal of Taxonomy (923): 4. doi:10.5852/ejt.2024.923.2445. Retrieved 2 November 2024.
This article incorporates text from this source, which is available under the CC BY-SA 4.0 license.