Biology:Longchaeus acus

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Short description: Species of sea snail

Needle pyram
A shell of Longchaeus acus from Samoa
Scientific classification edit
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Family: Pyramidellidae
Genus: Longchaeus
Species:
L. acus
Binomial name
Longchaeus acus
(Gmelin, 1791)
Synonyms[1]
  • Lonchaeus acus [sic]Gmelin, 1791
  • Longchaeus punctatus (Férussac, 1821)
  • Pyramidella (Longchaeus) acus (Gmelin, J.F., 1791)
  • Pyramidella acus (Gmelin, 1791)
  • Pyramidella maculosa Lamarck, J.B.P.A. de, 1822
  • Pyramidella musculosa Lamarck, J.B.P.A. de, 1816
  • Pyramidella punctata Schubert, H.G. & A.J. Wagner, 1829 (invalid: homonym and synonym of Pyramidella punctata Férussac, 1821)
  • Pyramidella punctata Férussac, 1821
  • Voluta acus Gmelin, 1791 (original combination)
  • Voluta guttata Link, H.F., 1807

Longchaeus acus, common name the needle pyram, is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[1][2][3]

Description

Drawing of Pyramidella acus from Manual of conchology, structural and systematic (1881)

The shell is polished. Its color is white, with dark chestnut or chocolate spots, usually arranged in three revolving series on the whorls of the teleoconch and five series on the body whorl. The whorls are lightly inflated. The columella is three-plaited with the upper plait being the largest. The lip is sometimes lirate within. The peripheral groove becomes in this species either obsolete or indicated by a slight angle.[4] Specimen photos show well impressed sutures. The length of the shell varies between 19 mm and 67 mm.

Distribution and Habitat

This marine species occurs in the Indo-West Pacific (Red Sea, Tanzania, Madagascar, Mauritius, Mascarene Basin[1], off the coast of the northern half of Australia[5], and in South East Asia, in Vietnam and Philippines). L. acus is a marine benthic[6] snail that resides in waters less than 40 meters below the surface.[5]

Life Habits

Diet

Snails in the family Pyramidellidae are carnivorous and often ectoparasitic[7], and species in the genus Longchaeus are noted to be browsing carnivores.[8] This family primarily feeds on clams, oysters, polychaetes, and occasionally other species of gastropod.[9]

Reproduction

This species reproduces sexually.[6]

Locomotion

L. acus moves by mucus mediated gliding.[6]

References

  1. ↑ 1.0 1.1 1.2 "WoRMS - World Register of Marine Species - Pyramidella acus (Gmelin, 1791)". https://www.marinespecies.org/aphia.php?p=taxdetails&id=208425. 
  2. ↑ Drivas, J. & M. Jay (1988). Coquillages de La Réunion et de l'île Maurice
  3. ↑ Dautzenberg, P. (1923). Liste preliminaire des mollusques marins de Madagascar et description de deux especes nouvelles. Journal de Conchyliologie 68: 21-74.
  4. ↑ Tryon, George Washington; Pilsbry, Henry Augustus (1881–1898). Manual of conchology, structural and systematic, with illustrations of the species. University of California Libraries. Philadelphia, Academy of Natural Sciences, Conchological Section. http://archive.org/details/manualconch08tryorich. 
  5. ↑ 5.0 5.1 "Longchaeus acus | Ocean Biodiversity Information System (OBIS)". https://obis.org/taxon/215192. 
  6. ↑ 6.0 6.1 6.2 "Longchaeus acus (Gmelin 1791) - Encyclopedia of Life". https://eol.org/pages/49351130. 
  7. ↑ "MolluscaBase - Longchaeus acus (Gmelin, 1791)". https://www.molluscabase.org/aphia.php?p=taxdetails&id=215192#attributes. 
  8. ↑ "NMITA Gastropod Diets Database". https://nmita.rsmas.miami.edu/database/mollusc/Gastropod_diet.html. 
  9. ↑ "Pyramidellidae family". https://jgs.nexgate.ch/Gastropoda/CLASSES/Pyramidellidae_en.php. 
  • Okutani T., ed. (2000) Marine mollusks in Japan. Tokai University Press. 1173 pp. page(s): 703

Wikidata ☰ Q7263308 entry




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