Petrolisthes lamarckii   (Leach,  1820) (Crab)
Organism information awaits expert curation
Class: Malacostraca

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Size: 6-17 mm (male), 5-9 mm (female), 7-12 mm (ovigerous female); length of carapace 12.5 mm, breadth of carapace 12.5 mm.

Color: Dark violet, mottled with violet pink.

Carapace depressed, as long as broad, almost smooth except for minute elevated irregular ridges which are faintly visible in front of the gastric region or sides only; front triangular, apically rounded, slightly deflexed downwards with a distinct median furrow. Epibranchial spine generally present, occasionally inconspicuous and in some cases absent; rugae on the carapace more and more conspicuous along the sides from epibranchial spine to the postero-lateral part of carapace; epimera entire, slightly hairy with 4-5 minute or undeveloped rugae.
Antennules: First segment twice or less than twice as broad as long, its anterior margin undulated, roughly semicircular in outer half and with a single tooth on its outer extremity only; dorsally it bears one spine-like tooth on the inner side; the lower half of its ventral surface squamiform and granulated, upper half granular.
Antenna: Anterior crest of second segment not distinctly undulated, its proximal end almost blunt and not drawn out into an acuminate spine. A short joint between second and third segments present; third segment with small tubercles along ventro-lateral margin, microscopical hairs on sub-distal margin; fourth segment smooth.
Chelipeds: Chelipeds subequal, upper surface ornamented with very minute rugae; merus armed with a long tooth at the inner extremity and a smaller tooth on the mid-ventral line of its distal margin; anterior margin of carapus lobed, provided with 3-7 teeth, its posterior margin generally with 3 indistinct teeth, 3-4 indistinct teeth also present on a rudimentary crest, arising from the proximal part, these teeth increase in size distally; upper surface of carpus and propodus ornamented with minute rugae, these rugae tend to become somewhat large and semicircular towards the posterior margin and less prominent towards the base of the fixed finger and dactylus.
Walking legs: Merus of first three ambulatory legs provided with rows of small, oblique granular ridges with microscopic hairs anteriorly. Merus of first two legs with a spine at distal end of posterior margin; carpus of first pair with a spine at antero-distal end; propodus with four spinules on its posterior margin; dactylus with 3 spinules.
Telson: 7 jointed, middle piece very broad.

Synonym (s)
Pisidia lamarckii Leach, 1820
Petrolisthes dentatus Haswell, 1882
Porcellana (Petrolisthes) dentata DeMan, 1888
Petrolisthes dentatus DeMan, 1896
Petrolisthes obtusifrons Miyake, 1937
Petrolisthes larmarckii Borradaile, 1898

Common Name (s)
• Lamarck's Porcelain Crab (English)
Economic Importance and Threats

Habitat:  Coastal


• Maharashtra, Mumbai Coast INDIA
• Maharashtra, Ratnagiri (Lat: 13.73) (Long: 77.13) INDIA
• Maharashtra, Ratnagiri INDIA
• Andaman and Nicobar Islands INDIA

Literature Source(s)
  • Sankolli, KN (1967) Studies on the larval development in Anomura (Crustacea, Decapoda)-I Symposium on Crustacea Part-2 Marine Biological Association of India 2 744-776 Available at - NIO RC, Kochi
  • Hussain, SM Brief report on biodiversity in the coastal areas of Pakistan p 113
  • Simoes, N; Apel, M and David, AJ (2001) Intertidal habitats and decapod faunal assemblages (Crustacea: Decapoda) of Socotra Island, Republic of Yemen Hydrobiologia Kluwer Academic Publishers 449 81-97
  • Lewinsohn, C (1979) Researches on the coast of Somalia. The shore and the dune of Sar Uanle. 23. Porcellanidae (Crustacea Decapoda Anomura) Monitore Zoologico Italiano Supplemento 12 (6) 39-57 Available at - Zoological Records
  • Sankolli, KN (1965) Studies on larval development in Anomura (Crustacea, Decapoda)I Proceedings of the symposium in Crustacea Marine Biological Association of India, Mandapam Camp part II 744-776 Available at - Library, CAS, Parangipatti
  • Sankolli, KN (1966) On the Porcellanidae (Crustacea-Anomura) of Ratnagiri along the west coast of India Proceedings of Symposium on Crustacea Marine Biological Association of India, Mandapam Camp Part-I 295-313 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Reeflex Available at -
  • Das, AK and Roy, MKD (1989) A general account of the mangrove fauna of Andaman and Nicobar islands Fauna of conservation areas Zoological survey of India 1-152 Available at - NIO, Goa

Page last updated on:2011-07-07

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