PORT PHILLIP BAY


Beaked Sea Spider 

Halicarcinus rostratus (Haswell, 1881)

View scientific description and taxonomy

Scientific Details

Carapace subcircular; postero- and anterolateral angles with acute spine; rostrum trilobate lateral lobes reduced, fused with medial lobe, medial lobe longer than eyes, tapering, arising below level of carapace, separated from dorsal carapace surface by ridge or groove; epistome broad. Maxilliped 3 broad. Walking legs with dactyli having 2 irregular rows of teeth.

Source: Poore, G.C.B. (2004) Marine decapod Crustacea of southern Australia. A guide to identification (with chapter on Stomatopoda by Shane Ahyong). CSIRO Publishing, Melbourne, 574 pp.

Taxonomy

Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Subclass:
Eumalacostraca
Superorder:
Eucarida
Order:
Decapoda
Suborder:
Pleocyemata
Infraorder:
Brachyura
Family:
Hymenosomatidae
Genus:
Halicarcinus
Species:
rostratus

General Description

Rostrum with three lobes (trilobite), lateral lobes reduced, fused with medial lobe, medial lobe longer than eyes, tapering, arising below level of carapace. Postocular teeth conspicuous. Lateral carapace wall with an acute spine. Walking legs with 7th segment (dactyli) having 2 irregular rows of teeth. Up to 5.5 mm wide.

Biology

This species is abundant in surveys of soft sediments of bays and the shelf in south-eastern Australia. The genus is represented throughout the western Pacific as far south as the subantarctic islands.

Habitat

Uncommon intertidally but frequently encountered in soft benthic samples, 2-130 m depth.

Reefs

Coastal shores

Distribution guide

Southern temperate oceans, including southern Australia.

Species Group

Crabs and allies Crabs

Depth

Shore (0-1 m)
Shallow (1-30 m)
Deep ( > 30 m)

Water Column

On or near sea floor

Max Size

6 mm

Diet

Organic matter

Harmful

Not harmful but a nip from large claws could be painful

Commercial Species

No

Global Dispersal

Native to Australia

Species Code

MoV 700

Conservation Status

  • DSE Advisory List : Not listed
  • EPBC Act 1999 : Not listed
  • IUCN Red List : Not listed

Author

article author Taylor, J.

Dr. Jo Taylor is the Sciences Collections Online Coordinator at Museum Victoria.

Author

article author Poore, G.C.B.

Dr. Gary Poore is Principal Curator Emeritus at Museum Victoria.

citation

Cite this page as:
Taylor, J. & Poore, G.C.B., 2011, Beaked Sea Spider, Halicarcinus rostratus, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 23 Nov 2017, http://portphillipmarinelife.net.au:8098/species/5477

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