''Diaugasma'' is a
genus of
sea snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...
s, marine
gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
mollusks in the
family Raphitomidae
Raphitomidae is a family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". '' Malacologia'' 47(1-2). . 3 ...
.
Description
The minute shell is oliviform, smoother microscopically spirally striolate, mainly on each side of the sutures, leaving the central portion of the
whorl
A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs).
Whorls in nature
File:Photograph and axial plane floral ...
plain, in form cylindrical or elongate, compact, only slightly
impressed at the sutures. The whorls of the
protoconch
A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called ...
are closely and very finely cancellate. The whorls are semi-pellucid, unicolorous white, or flecked with pale stramineous. The
aperture is narrowly oblong. The outer
lip is nearly straight, slightly thickened,. The sinus is hardly expressed.
Species
Species within the genus ''Diaugasma'' include:
* ''
Diaugasma epicharta''
(Melvill & Standen, 1903)
* ''
Diaugasma olyra''
(Reeve, 1845)
;Species brought into synonymy:
* ''Diaugasma marchadi''
(Knudsen, 1956):
synonym of ''
Kyllinia marchadi''
(Knudsen, 1956)
References
External links
Melvill J.C. & Standen R. (1903). ''Descriptions of sixty-eight new Gastropoda from the Persian Gulf, Gulf of Oman, and North Arabian Sea, dredged by the Indo-European Telegraph Service, 1901–1903.'' Annals and Magazine of Natural History. ser. 7, 12: 289-324Rolán E., Otero-Schmitt J. & Fernandes F. (1998) The family Turridae s. l. (Mollusca, Neogastropoda) in Angola (West Africa). 1. Subfamily Daphnellinae. Iberus, 16: 95–118
{{Taxonbar, from=Q3717837
Raphitomidae
Gastropod genera