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Placetron wosnessenskii

(Scaled Crab)


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Common Names

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Common Names in English:

Scaled Crab


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Physical Description

Species Placetron wosnessenskii

This lithodid crab has a wide, mostly soft abdomen, which is not held as tightly against the underside of the thorax as some other species do. The chelae are spoon-shaped and have setae along the edges ; both are of similar size. The carapace and legs are covered with what looks like scales . Colored greenish gray to reddish. Walking legs may have some banding and yellow or orange near the tips . Carapace width to 7.2 cm.[1]


Vertical rock faces and overhangs associated with Metridium senile; among boulders . Depth Range : Shallow subtidal to 110 m. [1]

Typically found in water with a depth of 0 to -3,738 meters (0 to -12,264 feet).[2]

Biome: Marine .


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Have been observed eating brittle stars.[1]


The abdomen of the female is covered with plates ; that of the male is soft with vestigial plates.[1]


Predators of this species include the river otter .[1]


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Lepeopus forcipatus


Name Status: Accepted Name .

Last scrutiny: 18-Jan-2005

Similar Species

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At first glance this crab looks superficially like the helmet crab, Telmessus cheiragonus (a Brachyuran), but can be distinguished by the wide, soft abdomen, the scale-like appearance, and the modified 5th leg characteristic of Anomurans. (Ref. 109953)

Members of the genus Placetron

ZipcodeZoo has pages for 1 species and subspecies in this genus:

P. wosnessenskii (Scaled Crab)

More Info

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Further Reading

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Data Sources

Accessed through GBIF Data Portal February 29, 2008:



  1. Cowles, Dave. Key to Invertebrates Found At or Near The Rosario Beach Marine Laboratory (a campus of Walla Walla University) Fidalgo Island, Anacortes, WA May 2009. [back]
  2. Mean = -636.360 meters (-2,087.795 feet), Standard Deviation = 894.900 based on 190 observations. Ocean depth information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 2014-10-16