''Pseudodaphnella oligoina'' is a species 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 ...

, a 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 ...

mollusk 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). . 39 ...

.MolluscaBase (2019). MolluscaBase. Pseudodaphnella oligoina Hedley, 1922. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=436653 on 2019-11-11

Description

The length of the shell attains 7 mm , its diameter 3 mm. (Original description) The shell is of medium size, rather thin, lanceolate, turreted, with a sloping shoulder, perpendicular periphery, and an excavate base. Its colour is uniform pale buff. The shell contains 7

whorls 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 d ...

, including a two-whorled

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 ...

. Sculpture: The radials are discontinuous from whorl to whorl, feeble and oblique on the shoulder, prominent and perpendicular on the peripheral area, and traversing the basal excavation, widely spaced. There are on the body whorl ten spirals slighter than the radials. On the fasciole area of the body whorl are three faint and narrow threads. From the shoulder to the basal angle are five cords, which override the ribs and thus enclose a series of oblong and nearly uniform meshes. On the snout are six crowded and progressively diminishing beaded spirals. The upper whorls carry four spirals. Within the meshes are fine radial striae. The basal furrow is spaced as if a spiral of regular sequence to the rest were omitted. The aperture is unusually wide. The

varix A varix (pl. varices) is an abnormally dilated vessel with a tortuous course. Varices usually occur in the venous system, but may also occur in arterial or lymphatic vessels. Examples of varices include: * Varicose veins, large tortuous veins usua ...

is prominent, more massive than the ribs. The sinus is shallow. The

siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...

is bent, short, and open. This species has a general resemblance to ''Kermia spelaeodea'' Hervier, 1897 (synonym of '' Pseudodaphnella infrasulcata'' (Garrett, 1873)) from

New Caledonia ) , anthem = "" , image_map = New Caledonia on the globe (small islands magnified) (Polynesia centered).svg , map_alt = Location of New Caledonia , map_caption = Location of New Caledonia , mapsize = 290px , subdivision_type = Sovereign st ...

, but is smaller, thinner, less cylindrical, and with fewer radials and spirals, resulting in larger meshes in the sculpture. Hedley, C. 1922. A revision of the Australian Turridae. Records of the Australian Museum 13(6): 213-359, pls 42-56

Distribution

This marine species is endemic to Australia and occurs off Queensland. It has also been found off Cebu, the Philippines.

References

* Powell, A.W.B. 1966. The molluscan families Speightiidae and Turridae, an evaluation of the valid taxa, both Recent and fossil, with list of characteristic species. Bulletin of the Auckland Institute and Museum. Auckland, New Zealand 5: 1–184, pls 1–23

External links

* {{DEFAULTSORT:Pseudodaphnella Oligoina oligoina Gastropods described in 1922 Gastropods of Australia