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Striarca lactea (Linnaeus, 1758)
''
NMW Image No.

Striarca lactea (Linnaeus, 1758)

Arcoidea : Noetiidae
Tebble name: Arca lactea Linnaeus
Smith & Heppell name: Striarca lactea (L., 1758)

To size: To 20mm. Shell Structure: Robust but not thick. Equivalve: Equivalve. Equilateral: Slightly inequilateral, beaks just infront of midline. Tumidity: Moderately inflated. Outline: Oblong; umbos prominent; dorsal margin straight; posterior oblique almost straight; ventral relatively long, gently curved to almost straight; anterior broadly rounded. Contour: Dorsal area wide, cleft; posterior area set off by a weak rounded carina.

Sculpture: Primary sculpture of very many fine radial riblets, all finely nodulose, those on anterior and posterior slopes more prominent and more widely spaced; secondary riblets added with growth. Margin: Inner margin smooth, some with indentations corresponding to radial riblets. Ligament: Duplivincular, arranged in parallel bands across the dorsal area, these added from between the beaks symmetrically. Hinge: Strong, of taxodont teeth set on an arched hinge plate; marginal teeth much stronger than medials. Pallial Musculature: Adductor muscles of roughly equal size, both a little raised and with myophoric flanges. Periostracum: Often persistent, of dense, brown, short hairs arising from between the riblets. Colour: White.



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Distribution & Ecology


Attached by a weak strap-like byssus to undersides of stones in the intertidal and sublittoral. A southern species restricted to south and southwest coasts, apparently not in Ireland but should be expected from south and west coasts.

Depth Range
Intertidal
Continental Shelf (to 200m)


Juveniles & Similar Species

Juvenile Description
Posterior carina more angular, ligament very small, amphidetic. Posterior margin straight. Juvenile Arca tetragona with ligament pit directed posteriorly, posterior deeply indented, carina prominent and sculpture stronger.

Key Features & Similar Species
The only arcoid in the region with a parallel banded ligament.

Additional Comments

Arcoidea : Noetiidae

References


Listed are literature citing Striarca lactea (Linnaeus, 1758). Reference containing the species Type Description is highlighted.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.

Resources


Downloads

Weblinks

  • Conchological Society of Great Britain & Ireland
    Provides resources for understanding, identifying, recording, and conserving molluscs
  • CLEMAM
    Check List of European Marine Mollusca
  • MarLIN
    The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment.
  • NBN Gateway
    National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers.
  • BivAToL
  • MarBEF
  • Malacological Society
  • Unitas Malacologica
  • Census of Marine Life
  • MarBEF
    MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.

Record last modified - 15/01/2014