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Calocarides quinqueseriatus (Rathbun, 1902)
Keeled Mud Lobster
Family: Axiidae

Species account author: Josephine Hart.
Extracted from Crabs and their relatives of British Columbia.
Introduction to the Crabs, Shrimps and Crayfish of BC

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Distribution of Calocarides quinqueseriatus in British Columbia in British Columbia

Species Information

Carapace smooth, cervical groove deep. Rostrum flattened, with toothed margins continuing as ridges on gastric area. Median ridge spined from mid rostrum to gastric area. These ridges are separated by 2 more short, spined ridges, making 5 in all. Eyestalk short and cornea without dark pigment. Antenna with relatively short projections or “thorns” on 2nd and 3rd segment of peduncle. Unequal, elongated chelipeds with toothed margins and surface of hands covered with numerous small sharp granules. A slight gape proximally between fingers of large cheliped but none on smaller. 1st walking leg short and chelate, with spines on posterior margin of ischium and merus. Others long and slender with setae terminally. Abdomen stout; pleura broad and lateral margins rounded. Tail fan with telson only slightly longer than 6th abdominal segment: lateral margins parallel and toothed, distal margin curved and with a median tooth. Two, spined ridges on telson and 1 on endopod of uropod. No pleopod on 1st abdominal segment. Slender biramous pleopods on 2nd to 5th segments with appendix interna. In male 2nd pleopod has an appendix masculina as well.

Size

Carapace: 27 mm. Total length: 73 mm.

Colour

Unrecorded.

Biology

Family Description

The thin-shelled shrimp-like animals in this family are all burrowers and are found from shallow subtidal habitats to great depths. Recently Pemberton, Risk and Buckley (1976) determined that one species found off Nova Scotia makes burrows more than 2.5 m into the substrate. Obviously in abyssal regions the collection of these animals under such circumstances in particularly haphazard. Thus the number of specimens obtained is few and often these are damaged. Four species of this family are known to occur in the waters off British Columbia. All have one or two small hollow knobs of apparently unknown function on the mid-dorsal ridge of the carapace. These species have been assigned to the genera Axiopsis, Calastacus and Calocaris. The definitions of these genera were made when few species had been studied and recent discoveries indicate that the criteria used are not satisfactory. New genera will have to be created and the taxonomy of the Family revised. It is important that any specimens obtained should be carefully preserved and placed in suitable research collections where they will be available for future study.

Habitat


Abyssal mud.

Distribution

Range

Sea of Okhotsk, and off San Nicolas Island, California; 288 to 2200 m.
Distribution In British Columbia

Off Vancouver Island (50°54.3’N, 130°6’W); at 2200 m.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)		COSEWIC
UnlistedUnlistedUnlistedUnlisted



BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

Calastacus quinqueseriata De Man, 1925
Calastacus quinqueseriatus Rathbun, 1902
Calocarides rostriserratus Andrade & Baez, 1977
Calocaris quinqueseriata De Man, 1925

General References

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