Overview

Comprehensive Description

Description

 A small, oval, plump inequilateral shell, 1 - 3.2 mm in length, with slightly posterior beaks and a smooth margin. The shell is dirty white in colour, often with a pinkish red tinge. High shore specimens may appear dark red in colour. The shell has a fine sculpture of concentric lines and the larval shell (prodissoconch) is visible and large, forming blunt, rounded umbones. May be confused with Turtonia minuta, which occupies a similar habitat.The genus Lasaea is cosmopolitan in distribution and composed of numerous species, which may be local variations of Lasaea adansoni (= rubra). Gosling (1994) suggested that species within this genus should be referred to as Lasaea rubra complex.
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Physical Description

Type Information

Holotype for Erycina catalinae Dall, 1916
Catalog Number: USNM 210879
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
Collector(s): S. Brannan
Locality: Catalina Id., California, United States, North Pacific Ocean
  • Holotype: Proc. Biol. Soc. Wash. 52(2183): 409.
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© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Ecology

Habitat

Depth range based on 74 specimens in 2 taxa.
Water temperature and chemistry ranges based on 18 samples.

Environmental ranges
  Depth range (m): 0 - 744
  Temperature range (°C): 4.074 - 11.845
  Nitrate (umol/L): 5.063 - 23.955
  Salinity (PPS): 34.769 - 35.373
  Oxygen (ml/l): 3.491 - 6.138
  Phosphate (umol/l): 0.336 - 1.571
  Silicate (umol/l): 2.448 - 16.914

Graphical representation

Depth range (m): 0 - 744

Temperature range (°C): 4.074 - 11.845

Nitrate (umol/L): 5.063 - 23.955

Salinity (PPS): 34.769 - 35.373

Oxygen (ml/l): 3.491 - 6.138

Phosphate (umol/l): 0.336 - 1.571

Silicate (umol/l): 2.448 - 16.914
 
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 Lasaea adansoni is a crevice or interstitial dwelling bivalve. It is found in high numbers in intertidal crevices. It also occupies interstices between mussels and barnacle shells, in the holdfasts of macroalgae (e.g. Fucus spp.), in the fronds of small algae and especially amongst tufts of the lichen Lichina pygmaea. It is most abundant in the upper and mid-shore, decreasing in numbers near high and low water.
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