Biology:Leucosyrinx

From HandWiki

Leucosyrinx is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae.[1]

Description

(Original description) The thin shell is white or pale without color pattern. The anal notch lies behind the periphery or at the suture. The sculpture is delicate and consists of spiral keels or threads and often oblique riblets on the shoulder of the whorls. The peripheral keel, if present, is not recurved. The operculum is thin, nucleus apical, scar of attachment small. The larval shell is glassy, rounded or keeled. The other shell characters are as in Pleurotoma. The species type is Pleurotoma verrillii Dall.

This group is intended to contain the operculated species of Pleurotomida which are so characteristic of the archibenthal region. They are distinctly contrasted with the coarse, spotted or maculated shallow-water species of Pleuroma proper, by their thin, white, delicately sculptured shells. They are apart from Drillia by having no subtubular projection of the anal notch when adult and no thick varix to mark their maturity. They are separable from the archibenthal Drillias also by their larger shells, longer siphonal canal, and more inflated habit. The anal notch is generally wider, more rounded and nearer the suture than in the typical Pleurotoma, and the operculum proportionally wider and more delicate.[2]

(More recent description by Kantor et al.) The shell of Leucosyrinx is relatively poor in diagnostic features. The intraspecific variability within molecularly defined species can be high. The shell is small to large, reaching up to about 90 mm in length in Leucosyrinx bolognai. It is narrow fusiform to broadly oval, with a high spire and a distinct siphonal canal that is medium‑long to long. The shell is uniformly coloured, ranging from off‑white through beige to light brown. The protoconch is paucispiral and small, about 1 mm in diameter, and consists of 1.5–1.75 rounded whorls. The teleoconch whorls are roundly angled at the shoulder, at least on the upper whorls, and bear a well‑defined, concave subsutural ramp.

The axial sculpture consists of usually strong, oblique axial ribs that occupy the shoulder and the area below it, but do not extend onto the subsutural ramp. These ribs may be reduced to mere knobs on the shoulder, or they may reach the periphery and even the shell base. The spiral sculpture is very similar among species and ranges from weak to rather strong and is formed by uniform spiral cords, which may be present or absent on the subsutural ramp.

The anal sinus is moderately deep, subsutural, and broadly arcuate. It spans the entire subsutural ramp and merges with a large forward extension of the outer lip. The shape and position of the anal sinus, which spans across the entire subsutural ramp but does not extend below the shoulder, distinguishes Leucosyrinx from Comitas. The operculum is narrow to moderately broad and leaf‑shaped, with a terminal nucleus.

The radular morphology is fairly uniform within the genus. The radular marginal teeth are duplex, narrow to broadly lanceolate, and appear rather flat in dorsal view, particularly in the anterior portion or tooth tip. The major limb is pointed, with sharp cutting edges; it is broadest at mid‑length and narrows toward both ends, and it shows a distinct socket on the dorsal surface where the accessory limb embeds. The central formation is very weak to completely absent, represented only by indistinct symmetrical folds of the membrane and, more rarely, by a very weak central cusp.[3]

Distribution

Leucosyrinx is a broadly distributed genus found in both the Indo-Pacific and Atlantic Oceans (from North Carolina to Argentina); also off Japan and Australia [3]

Species

Species within the genus Leucosyrinx include:[1]

Synonyms

  • Leucosyrinx amycus W.H. Dall, 1919: synonym of Aforia goodei (Dall, 1890)
  • Leucosyrinx angusteplicata (Strebel, 1905): synonym of Antarctospira angusteplicata (Strebel, 1905)
  • Leucosyrinx (Sibogasyrinx) archibenthalis Powell, 1969 : synonym of Sibogasyrinx archibenthalis (Powell, 1969) (basionym)
  • Leucosyrinx aequatorialis Thiele, 1925: synonym of Comitas aequatorialis (Thiele, 1925)
  • † Leucosyrinx alta (Harris, 1897): synonym of † Parasyrinx alta (Harris, 1897)
  • Leucosyrinx angustiplicata (Strebel, 1905): synonym of Leucosyrinx angusteplicata (Strebel, 1905)
  • Leucosyrinx badenpowelli Dell, 1990: synonym of Antarctospira badenpowelli (Dell, 1990)
  • Leucosyrinx circinata Dall, 1873: synonym of Aforia circinata (Dall, 1873)
  • Leucosyrinx circumcinctum Locard, 1897: synonym of Borsonia hirondelleae (Dautzenberg, 1891)
  • Leucosyrinx clionella Dall, 1908: synonym of Burchia clionella (Dall, 1908)
  • Leucosyrinx cuvierensis Mestayer, 1919: synonym of Terefundus cuvierensis (Mestayer, 1919)
  • Leucosyrinx dalli (Bush, 1893): synonym of Corinnaeturris leucomata (Dall, 1881)
  • Leucosyrinx eremita (Murdoch & Suter, 1906): synonym of Antimelatoma eremita (Murdoch & Suter, 1906)
  • Leucosyrinx erica Thiele, 1925: synonym of Comispira erica (Thiele, 1925)
  • Leucosyrinx erosina Dall, 1908: synonym of Borsonella erosina (Dall, 1908)
  • Leucosyrinx erranea (Locard, 1897): synonym of Borsonia hirondelleae (Dautzenberg, 1891)
  • Leucosyrinx falklandica Powell, 1951: synonym of Antarctospira falklandica (Powell, 1951) (original combination)
  • Leucosyrinx galapagana Dall, 1919: synonym of Exilia cortezi (Dall, 1908)
  • Leucosyrinx goodei Dall, 1890: synonym of Aforia goodei (Dall, 1890)
  • Leucosyrinx gradata Thiele, 1925: synonym of Leucosyrinx verrillii (Dall, 1881)
  • Leucosyrinx janetae Bartsch, 1934: synonym of Leucosyrinx verrillii (Dall, 1881)
  • Leucosyrinx kantori McLean, 1995: synonym of Rhodopetoma amycus (Dall, 1919) (unnecessary replacement name for Antiplanes amycus, by McLean treated as a secondary homonym of Leucosyrinx amycus)
  • Leucosyrinx kincaidi Dall, 1919: synonym of Aforia kincaidi (Dall, 1919)
  • Leucosyrinx lancea Lee, 2001: synonym of Sibogasyrinx lancea (Y.-C. Lee, 2001) (superseded combination)
  • Leucosyrinx macroberstoni Powell, 1958: synonym of Leucosyrinx macrobertsoni Powell, 1958 (misspelling)
  • Leucosyrinx mai Li & Li, 2008: synonym of Comispira mai (B.-Q. Li & X.-Z. Li, 2008) (original combination)
  • Leucosyrinx mawsoni Powell, 1958: synonym of Antarctospira mawsoni (Powell, 1958) (original combination)
  • Leucosyrinx minatoensis Otuka, 1959: synonym of Aforia circinata (Dall, 1873)
  • Leucosyrinx otohimei Ozaki, 1958: synonym of Aforia circinata (Dall, 1873)
  • Leucosyrinx pacifica Dall, 1908: synonym of Belomitra pacifica (Dall, 1908)
  • Leucosyrinx paragenota Powell, 1951: synonym of Antarctospira paragenota (Powell, 1951)
  • Leucosyrinx paratenoceras Powell, 1951: synonym of Typhlodaphne paratenoceras (Powell, 1951) (original combination)
  • Leucosyrinx persimilis (Dall, 1890): synonym of Aforia persimilis (Dall, 1890)
  • Leucosyrinx pikei (Dell, 1963): synonym of Sibogasyrinx pikei (Dell, 1963) (unaccepted > superseded combination)
  • Leucosyrinx pyramidalis (Schepman, 1913): synonym of Sibogasyrinx pyramidalis (Schepman, 1913)
  • Leucosyrinx queenslandica Powell, 1969: synonym of Zemacies queenslandica (Powell, 1969)
  • Leucosyrinx recta Hedley, 1903: synonym of Austrocarina recta (Hedley, 1903)
  • † Leucosyrinx rugata (Conrad, 1862): synonym of † Nodisurculina rugata (Conrad, 1862)
  • Leucosyrinx sigsbeei (Dall, 1881): synonym of Leucosyrinx verrillii (Dall, 1881)
  • † Leucosyrinx subaltus P. Marshall & Murdoch, 1919: synonym of † Parasyrinx subalta (P. Marshall & R. Murdoch, 1919)
  • Leucosyrinx tenoceras (Dall, 1889): synonym of Leucosyrinx verrillii (Dall, 1881)
  • Leucosyrinx thomsoni Mestayer, 1919: synonym of Taranis nexilis bicarinata (Suter, 1915)

References

  1. ↑ 1.0 1.1 WoRMS (2011). Leucosyrinx Dall, 1889. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138611 on 2011-03-11
  2. ↑ Bulletin of the Museum of Comparative Zoology at Harvard College vol. 18 (1889)
  3. ↑ 3.0 3.1 Kantor, Y. I.; Fedosov, A.; Puillandre, N. (2025). "Revision of the Indo-Pacific species of the genus Leucosyrinx Dall, 1889 (Neogastropoda: Conoidea: Pseudomelatomidae)". European Journal of Taxonomy 999: 7. https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/2945. Retrieved 7 July 2026.  Public Domain This article incorporates text from this source, which is under a CC BY 4.0 license.
  • "Leucosyrinx". Integrated Taxonomic Information System. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=74798. 
  • Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1

Wikidata ☰ Q3138069 entry



Retrieved from "https://handwiki.org/wiki/index.php?title=Biology:Leucosyrinx&oldid=4647220"