Antarctospira Angusteplicata
   HOME

TheInfoList



OR:

''Antarctospira angusteplicata'' is a
species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
of
sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...
, a marine
gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...
mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000  extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...
in the
family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
Borsoniidae Borsoniidae is a monophyletic family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet, P. (2011). Borsoniidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/ ...
.MolluscaBase eds. (2020). MolluscaBase. Antarctospira angusteplicata (Strebel, 1905). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1329624 on 2020-03-28


Description

The length of the shell attains 21 mm. (Original description in German) The shell is solid, white, and covered by a yellowish cuticle. The initial whorls of the protoconch possess a slightly inflated nucleus. Subsequent
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). In nature File:Photograph and axial plane floral diagra ...
s initially diverge from the suture at a somewhat oblique, roof-like angle, then descend steeply, forming a blunt edge. The
body whorl The body whorl is part of the morphology (biology), morphology of the gastropod shell, shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk ...
constricts below, culminating in a moderately long beak. The
aperture In optics, the aperture of an optical system (including a system consisting of a single lens) is the hole or opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image o ...
is narrow, only slightly wider at its upper portion than 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 i ...
, which is recurved at the base. The columellar
callus A callus (: calluses) is an area of thickened and sometimes hardened skin that forms as a response to repeated friction, pressure, or other irritation. Since repeated contact is required, calluses are most often found on the feet and hands, b ...
ascends almost vertically from the base before bending at a blunt angle towards the suture. A diagonal, ridge-like elevation extends across the callus, sloping down to the steep columellar base. The
sculpture Sculpture is the branch of the visual arts that operates in three dimensions. Sculpture is the three-dimensional art work which is physically presented in the dimensions of height, width and depth. It is one of the plastic arts. Durable sc ...
consists of fine growth lines and narrow, low, yet sharply defined, folds. These folds appear compressed, often comprising two or three such folds pushed together. They are short, becoming weaker in the sinus area and, on the body whorl, barely extending beyond the midpoint. Near the aperture, these folds, though diminished, reach the base. Closely spaced, somewhat wavy spiral grooves are also present. These grooves become more closely set towards the base, where the interspaces appear as flatly arched rings. Approximately 40 such grooves are present on the body whorl. Strebel H. (1905). Beiträge zur Kenntnis der Molluskenfauna der Magelhaen-Provinz. No. 3. Zoologische Jahrbücher, Abteilung für Systematik, Geographie und Biologie der Tiere. 22: 575-666, pls 21-24


Distribution

This marine species occurs off the
Falkland Islands The Falkland Islands (; ), commonly referred to as The Falklands, is an archipelago in the South Atlantic Ocean on the Patagonian Shelf. The principal islands are about east of South America's southern Patagonian coast and from Cape Dub ...
and the
Strait Of Magellan The Strait of Magellan (), also called the Straits of Magellan, is a navigable sea route in southern Chile separating mainland South America to the north and the Tierra del Fuego archipelago to the south. Considered the most important natura ...
,
Tierra del Fuego Tierra del Fuego (, ; Spanish for "Land of Fire", rarely also Fireland in English) is an archipelago off the southernmost tip of the South America, South American mainland, across the Strait of Magellan. The archipelago consists of the main is ...
,
Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...
, South
Atlantic Ocean The Atlantic Ocean is the second largest of the world's five borders of the oceans, oceanic divisions, with an area of about . It covers approximately 17% of Earth#Surface, Earth's surface and about 24% of its water surface area. During the ...


References


External links


Powell A. W. B. (1951). Antarctic and Subantarctic Mollusca: Pelecypoda and Gastropoda. Discovery Reports, 26: 47-196, pl. 5-10

Kantor Y.I., Harasewych M.G. & Puillandre N. (2016). A critical review of Antarctic Conoidea (Neogastropoda). Molluscan Research. 36(3): 153-206
*
Gastropods.com: ''Leucosyrinx paragenota''

Gastropods.com: ''Leucosyrinx angusteplicata''
{{DEFAULTSORT:Antarctospira Angusteplicata angusteplicata Gastropods described in 1905