PORT PHILLIP BAY


Comma Shrimp 

Litogynodiastylis ambigua (Hale, 1946)

View scientific description and taxonomy

Scientific Details

Female and subadult male. Carapace smooth, unornamented. Pseudorostral lobes directed ventrally. Eye lobe with 3 lenses. First antenna small to moderate. Pereopod 1 simple, relatively short. Pereopod 2 basis expanded. Female with fully developed exopods on pereopods 1 and 2, pereopods 3 and 4 without exopods. Uropod endopod of 1, 2, or 3 articles. Telson 0.5?2 times length of last pleonite; telson subequal to uropod peduncles,
lateral margins serrate, bearing 1 pair stout lateral setae and 1 pair stout terminal setae. Uropod endopod triarticulate, much longer than exopod. Terminal setae of uropod rami simple.

Adult male. As in female, except exopods present on maxilliped 3?pereopod 2. Telson longer than uropod peduncles. Uropod endopod biarticulate, much longer than exopod. Antenna 2 peduncle of 3?4 articles, flagellum of 10?12 articles.

Source: Gerken, S. (2001) The Gynodiastylidae (Crustacea: Cumacea). Memoirs of the Museum of Victoria, 59, 1-276.

Taxonomy

Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Subclass:
Eumalacostraca
Superorder:
Peracarida
Order:
Cumacea
Family:
Gynodiastylidae
Genus:
Litogynodiastylis
Species:
ambigua

General Description

Female and subadult male. Carapace smooth, unornamented. Pseudorostrum ventrally directed. Eyelobe with 3 lenses. Pereopod 2 basis expanded. Telson subequal to uropod peduncles, lateral margins serrate, bearing 1 pair stout lateral setae and 1 pair stout terminal setae. Uropod endopod triarticulate, much longer than exopod. Terminal setae of uropod rami simple. Adult male. As in female, except exopods present on maxilliped 3?pereopod 2. Telson longer than uropod peduncles. Uropod endopod biarticulate, much longer than exopod.

Biology

Litogynodiastylis ambigua was described based on specimens that could be divided into three different forms, varying in size, robustness, and carapace dimensions, hence the name "ambigua". The size and robustness of the various forms could be attributed to environmental variations, therefore the three variants are considered a single species.

Habitat

Among macroalgae in sandy sediments, to depth of 400 m.

Soft substrates

Distribution guide

Southern temperate oceans, including south-eastern Australia.

Species Group

Microcrustaceans Cumaceans

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

Native to Australia

Species Code

MoV 53

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, Comma Shrimp, Litogynodiastylis ambigua, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 23 Nov 2017, http://portphillipmarinelife.net.au:8098/species/5290

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