Ilanga laevissima

Ilanga laevissima is a species of sea snail, a marine gastropod mollusk in the family Solariellidae.[1][2]

Ilanga laevissima
Drawing with three views of a shell of Ilanga laevissima
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Solariellidae
Genus: Ilanga
Species:
I. laevissima
Binomial name
Ilanga laevissima
(Martens, 1881)
Synonyms[1]
  • Machaeroplax laevissima (Martens, 1881)
  • Minolia (Machaeroplax) congener G.B. Sowerby, 1903
  • Minolia laevissima (Martens, 1881)
  • Monilea laevissima (Martens, 1881)
  • Solariella laevissima (Martens, 1881)
  • Solariella nitens Thiele, 1925
  • Trochus laevissimus Martens, 1881

Description

The size of the shell varies between 9 mm and 22 mm. The shell is broadly umbilicated and the spire has a depressed conoidal shape. It is sculptured with very fine, hardly visible spiral striae and is otherwise smooth. It is very shining, ashen-whitish, painted with light yellowish to light brown confluent flammules above and at the umbilicus. It is ornamented with waved zigzag and acutely angular light and dark brown streaks. The 5½ whorls are slightly convex, moderately sloping, separated by simple, deep-channeled sutures. The spire shows only here and there very faint traces of obsolete spiral striae. The broad body whorl convex above with small erect slightly angular nodules in three rows, the two rounded at the periphery, depressly convex at the base. The rather large and deep umbilicus is cylindrical. It is bordered on the outer edge by an obtuse angle, a second angle appearing a little way within the orifice. The space between the two angles is slightly flattened, numerous very distinct close-set plicae traverse this space, crossing the angles. The rather large, diagonal aperture is rounded-trapezoidal. The thin, simple peristome is incomplete. The columellar margin is straightened, forming an obtuse angle where it joins the basal lip. The outer lip is sloping above, rounded at the base. The horny, concave operculum is thin with 6-7 whorls and has a raised lamina at the suture of the whorls.[3][4]

Distribution

This marine species occurs off Zululand to the Atlantic Cape Province, South Africa

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References
  1. WoRMS (2012). Ilanga laevissima (Martens, 1881). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=567651 on 2012-12-03
  2. Herbert D.G. (1987). Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa. Annals of the Natal Museum 25(2):283-382.
  3. Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia (described as Monilea laevissima)
  4. G.B. Sowerby III (1904) Mollusca of South Africa; Marine investigations in South Africa , v. 2 (1904) (described as Minolia congener)
  • von Martens 1881: Anschluss an frühere Mittheilungen mehrere neue Arten von Conchylien vor, theils aus Central-Asien (vergl. October 1879), theils von den Sammlungen Sr. M. Schiff Gazelle (vergl. Februar und Juli 1878) herrührend. 65; Sitzungs-Bericht der Gesellschaft naturforschender Freunde zu Berlin v.4 p. 63-67
  • To World Register of Marine Species
  • "Ilanga laevissima". Gastropods.com. Retrieved 16 January 2019.
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