PORT PHILLIP BAY


Gnathiid Isopod 

Gnathia camponotus Cohen & Poore, 1994

View scientific description and taxonomy

Scientific Details

Eyes usually present. Frontal margin of cephalon generally transverse, with frontal processes. Mandibles usually with dentate mandibular blade and mandibular incisor. Cephalon may possess paraocular ornamentation and/or a dorsal sulcus. Pereonite 1 immersed in cephalon. Pylopod 2- or 3-articled; operculate, article 1 enlarged, generally with dense external margin of plumose setae; article 3 small or absent.

Source: Cohen, B.F. & Poore, G.C.B. (1994) Phylogeny and biogeography of the Gnathiidae (Crustacea: Isopoda) with descriptions of new genera and species, most from south-eastern Australia. Memoirs of the Museum of Victoria, 54, 271-397.

Taxonomy

Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Subclass:
Eumalacostraca
Superorder:
Peracarida
Order:
Isopoda
Suborder:
Cymothoida
Superfamily:
Cymothooidea
Family:
Gnathiidae
Genus:
Gnathia
Species:
camponotus

General Description

Cephalon and anterior pereon with granules; mandibles symmetrical, with incisors, greater than half length of cephalon; maxillipedal endite broad. Mediofrontal process conical with many notches on lateral margins; paraocular ornamentation not extremely produced; frontal border at most only slightly produced; pereon with anterior constriction on peronite 4. Pleopods subequal. Penes not fused and produced. Up to 3.5 mm long.

Biology

Sea mites lead complicated lives. The juvenile stage, called a praniza, lives attached to the skin of a fish where it feeds on blood and mucus which it obtains with sharp little jaws. The praniza metamorphoses into either a male (recognised by its huge jaws) or a female which broods a clutch of coloured eggs in its thorax. The male maintains a harem of females in a communal burrow in sandy rubble or algae. There are many species of gnathiids in all marine environments in Australia.

Habitat

Sandy sediments, at depths of 11-130 m.

Reefs

Distribution guide

Southern Australia.

Species Group

Microcrustaceans Isopods

Depth

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

Water Column

On or near sea floor

Max Size

3.5 mm

Diet

Organic matter

Commercial Species

No

Global Dispersal

Recorded in Australia

Species Code

MoV 1607

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, Gnathiid Isopod, Gnathia camponotus, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 18 Aug 2017, http://portphillipmarinelife.net.au:8098/species/5315

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