Pyramidella acus

Needle pyram
A shell of Longchaeus acus from Philippines on display at the Museo Civico di Storia Naturale di Milano
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia clade Euthyneura clade Panpulmonata
Superfamily:	Pyramidelloidea
Family:	Pyramidellidae
Genus:	Longchaeus
Species:	L. acus
Binomial name
Longchaeus acus (Gmelin, 1791)
Synonyms
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

External identifiers for Longchaeus acus
Encyclopedia of Life	4812631
WoRMS	208425

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.

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 columella is three-plaited with the upper plait largest. The lip is sometimes lirate within. The peripheral groove becomes in this species either obsolete or indicated by a slight angle. The length of the shell varies between 19 mm and 67 mm.

This marine species occurs in the Indo-W Pacific (Red Sea, Tanzania, Madagascar, Mauritius, Mascarene Basin and in South East Asia, in Vietnam and Philippines).

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