|
Pleurotomella Anomalapex 002
''Pleurotomella'' is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae. Description (Original description by Verrill) As at present understood, this genus is intended to include those species which have a rather broad and very distinct subsutural band, crossed by excurved lines of growth corresponding to the form of the posterior sinus of the lip, which is situated a little below the suture and is always pretty well-developed, but is sometimes broad and shallow, and at other times narrower and very deep. The outer lip is always thin and sharp, without any appearance of a varix, nor is there any deposit of callus on the body whorl, in front of the aperture. The siphonal canal is well developed, generally constricted at the base and somewhat elongated, and usually but slightly curved. In a few of the species, doubtfully referred to hie genus, it is short and wide. The columella-margin is more or less sinuous. The protoconch differs in sculpture, and usua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Circumvoluta
''Pleurotomella circumvoluta'' is a species of sea snail, a marine gastropod mollusk in the family (biology), family Raphitomidae. Description The shell grows to a length of 12 mm. The shell has a strong superficial resemblance to ''Glyphostoma gratula'' (Dall, 1881), but with a totally different protoconch, and with differences in details of Sculpture (mollusc), sculpture. It also has not the minute punctation. The color of the shell is white or ashy gray. The protoconch and its whorls are heliciform, with a sculpture of slightly raised lamellae waved backward from the middle point of the periphery both ways. Under these are also fine revolving raised lines. The shell contains 9 Whorl (mollusc), whorls. The remainder show a transverse sculpture of from sixteen to (on the body whorl) eighteen narrow raised riblets passing entirely over the whorls, quite faint on the band and only obsolete on the Columella (gastropod), columella and the siphonal canal. Beside these the lines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whorl (mollusc)
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in numerous gastropods, but it is also found in shelled cephalopods including ''Nautilus'', ''Spirula'' and the large extinct subclass of cephalopods known as the ammonites. A spiral shell can be visualized as consisting of a long conical tube, the growth of which is coiled into an overall helical or planispiral shape, for reasons of both strength and compactness. The number of whorls which exist in an adult shell of a particular species depends on mathematical factors in the geometric growth, as described in D'Arcy Wentworth Thompson's classic 1917 book ''On Growth and Form'', and by David Raup. The main factor is how rapidly the conical tube expands (or flares-out) over time. When the rate of expansion is low, such that each subsequent whorl is not that much wider than the previous one, then the adult shell has numerous whorls. When the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Bellistriata
''Pleurotomella bellistriata'' is an extinct species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell attains 25 mm, its diameter 12 mm. (Original description) The small, subfusiform shell has a rather short pointed spire and contains about 5 whorls. The large body whorl is somewhat inflated. The earlier whorls are nearly flat. The surface is sculptured with numerous alternating larger and smaller spiral threads crossed by fine wavy lines and by irregularly spaced oblique ribs, about twenty in number on the body whorl. The ribs are strongest at the shoulder, gradually disappearing both posteriorly and anteriorly. The shell is somewhat excavated behind the shoulder. The aperture is narrow. This form is from the Woodstock stage. Distribution Fossils of this marine species were found in Oligocene strata of Maryland Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Bathybia
''Pleurotomella bathybia'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.MolluscaBase (2019). MolluscaBase. Pleurotomella bathybia Strebel, 1908. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=197014 on 2019-09-07 Description The length of the shell attains 6.5 mm. Distribution This marine species occurs off South Georgia Island & South Sandwich Islands ) , anthem = "God Save the King" , song_type = , song = , image_map = South Georgia and the South Sandwich Islands in United Kingdom.svg , map_caption = Location of South Georgia and the South Sandwich Islands in the southern Atlantic Oce ... at depths between 94 m - 310 m. References * Strebel, Dr. H., die Gastropoden. In : Wissenschaftliche Ergebnisse der Schwedischen Südpolar-Expedition 1901 — 1903 unter Leitung von Dr. Otto Nordenskjöld, Band VI, Lfg. 1. - Mit 6 Tafeln. * Engl, W. (2012). Shells of Antarctic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Bateroensis
''Pleurotomella bateroensis'' is an extinct species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell attains 6 mm. Distribution Fossils of this marine species were found in Oligocene The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the ... strata in Aquitaine, France. References * Lozouet P. (1999). Nouvelles espèces de gastéropodes (Mollusca: Gastropoda) de l'Oligocène et du Miocène inférieur d'Aquitaine (sud-ouest de la France). Partie 2. Cossmanniana. 6: 1-68. External links Lozouet P. (2017). Les Conoidea de l'Oligocène supérieur (Chattien) du bassin de l'Adour (Sud-Ouest de la France). Cossmanniana. 19: 3-180 bateroensis Gastropods described in 1999 {{paleo-Pleurotomella-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Balcombensis
''Pleurotomella balcombensis'' is an extinct species of sea snail, a marine gastropod 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. Pleurotomella balcombensis (Powell, 1944) †. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=868143 on 2019-10-31 Description Distribution Fossils of this marine species were found off Victoria, Australia References External links Beu, A.G. 2011 ''Marine Molluscs of oxygen isotope stages of the last 2 million years in New Zealand. Part 4. Gastropoda (Ptenoglossa, Neogastropoda, Heterobranchia)''. Journal of the Royal Society of New Zealand 41, 1–153 balcombensis Gastropods described in 1944 Gastrop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Anomalapex
''Pleurotomella anomalapex'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell attains 7.8 mm. Distribution This marine species occurs off the Falkland Islands and Patagonia; off the South Sandwich Islands ) , anthem = "God Save the King" , song_type = , song = , image_map = South Georgia and the South Sandwich Islands in United Kingdom.svg , map_caption = Location of South Georgia and the South Sandwich Islands in the southern Atlantic Oce ... and the Scotia Sea. References * Powell, Arthur William Baden. ''Antarctic and subantarctic mollusca: Pelecypoda and Gastropoda.'' Vol. 26. University Press, 1951. External links Kantor Y.I., Harasewych M.G. & Puillandre N. (2016). A critical review of Antarctic Conoidea (Neogastropoda). Molluscan Research. 36(3): 153-206* anomalapex Gastropods described in 1951 {{Pleurotomella-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Annulata
''Pleurotomella annulata'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell attains 5.2 mm. Distribution This marine species occurs in the Davis Sea and the Weddell Sea, Antarctica. References * Dell, R.K. 1990. ''Antarctic Mollusca: with special reference to the fauna of the Ross Sea.'' Bulletin of the Royal Society of New Zealand 27: 1–311 * Engl, W. 2012. ''Shells of Antarctica.'' Hackenheim : Conchbooks 402 pp. External links Die antarktischen Schnecken und Muscheln In: Deutsche Südpolar-Expedition 1901-1903 (Erich von Drygalski Erich Dagobert von Drygalski (; February 9, 1865 – January 10, 1949) was a German geographer, geophysicist and polar scientist, born in Königsberg, East Prussia. Between 1882 and 1887, Drygalski studied mathematics and natural science at t ..., E.v. ed.), vol. 8, No. 5, Georg Reimer, Berlin. Kantor Y.I., Harasewych M.G. & Puillandre N. (2016). A critical review of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Anceyi
''Pleurotomella anceyi'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The shell attains a length of 7.4 mm, its diameter 3.4 mm. Distribution This marine species was found off the Azores ) , motto =( en, "Rather die free than subjected in peace") , anthem= ( en, "Anthem of the Azores") , image_map=Locator_map_of_Azores_in_EU.svg , map_alt=Location of the Azores within the European Union , map_caption=Location of the Azores wi ... at a depth of 1360 m. References * Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca. in: Costello, M.J. et al. (eds), European Register of Marine Species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Patrimoines Naturels. 50: 180-213. External links Dautzenberg P. & Fischer H. (1897). Dragages effectués par l'Hirondelle et par la Princesse Alice 1888-1896. Mémoires de la Société Zoologique de France. 139-234; pl. 3-7* ancey ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Amplecta
''Pleurotomella amplecta'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.MolluscaBase (2019). Pleurotomella amplecta (Hedley, 1922). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=868142 on 2019-02-03 Description The length of the shell attains 12 mm, its diameter 5 mm. (Original description) The shell is fusiform. It contains nine whorls, including the protoconch. Its colour is dull white. The protoconch consists of two rounded microscopically spirally grooved whorls. Sculpture: On the first adult whorl there are nine or ten radials, which decrease to six on the lower whorls. These are discontinuous, prominent, vertical, ceasing at the fasciole and on the base. The spirals are evenly spaced, sharp, elevated, overriding and denticulating the ribs, increasing by intercalation from two above to about eighteen below. These are again traversed by a secondary sculpture of fine radiating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Amphiblestrum
''Pleurotomella amphiblestrum'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of this shell attains 7.5 mm, its diameter 2.5 mm. Distribution This marine species occurs in the Gulf of Oman The Gulf of Oman or Sea of Oman ( ar, خليج عمان ''khalīj ʿumān''; fa, دریای عمان ''daryâ-ye omân''), also known as Gulf of Makran or Sea of Makran ( ar, خلیج مکران ''khalīj makrān''; fa, دریای مکرا ... References External links MELVILL, J. COSMO. "DESCRIPTIONS OF TWENTY-THREE SPECIES OF GASTROPODA FROM THE PERSIAN GULF, GULF OF OMAN, AND ARABIAN SEA, DREDGED BY MR. FW TOWNSEND, OF THE INDOEUROPEAN TELEGRAPH SERVICE, IN 1903." Journal of Molluscan Studies 6.1 (1904): 51-60 * amphiblestrum Gastropods described in 1904 {{Pleurotomella-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomella Allisoni
''Pleurotomella allisoni'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.MolluscaBase (2019). MolluscaBase. Pleurotomella allisoni Rehder & Ladd, 1973. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=719673 on 2019-08-28 Description The length (incomplete) of the shell attains 17.6 mm, its diameter 6.6 mm. Distribution This marine species occurs on Mid-Pacific Seamounts between the Marshall Islands and Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ... at depths between 1582 m and 1617 m. References Rehder H. A. & Ladd H. S. (1973) Deep and shallow-water mollusks from the Central Pacific. Science Reports of the Tohoku University, Sendai, ser. 2 (Geology) Special vol. 6 (Hat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
