Biology
provided by Arctic Ocean Biodiversity 2011
A very common lyre crab of shallow Arctic seas
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Habitat
provided by Arctic Ocean Biodiversity 2011
Mud, sand and gravel, 22-218 m; Some biologists recognize separate subspecies of the Arctic lyre crab, as yet unconfirmed by genetics
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Life Cycle
provided by Arctic Ocean Biodiversity 2011
Like other spider crabs (superfamily Majoidea), there is a terminal molt, after which they mate, carry eggs, then die; Fertilization is internal; Females carry a mass of 1500-8000 fertilized eggs under the abdomen; Egg-bearing females reported from April to August, but the eggs do not hatch until nine to eleven months later; Females can produce two sets of eggs in their lifespan; Eggs hatch into pelagic zoeal stages and then metamorphose into megalops stages before settling to the sea floor; Lyre crabs spawn in their second year after hatching; More Biology and Ecology; Small individuals are decorators-they attach bits of algae or debris to the setae of the rostrum, carapace proper and walking legs; The carapace of old individuals may be encrusted with barnacles, tube-building worms, and bryozoans
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Trophic Strategy
provided by Arctic Ocean Biodiversity 2011
Scavenger, grazer on algae, predator on hydroids, annelids, crustaceans and mollusks.; The related H. lyratus has been observed to capture and eat small fishes and shrimp.
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Comprehensive Description
provided by Arctic Ocean Biodiversity 2011
Dusky brick red above, whitish below; Rostrum with two short, broad horns; Carapace longer than broad, posterior part wider than anterior, with prominent hepatic lobe; Dorsal surface with few large tubercles
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Hyas coarctatus
provided by wikipedia EN
Hyas coarctatus is a marine crab species native to the North Atlantic.[1] It is characterized by a lyriformed shell.
Morphology
Hyas coarctatus looks like the great spider crab (H. araneus) but has a lyriformed shell. The carapace of a large specimen is up to 60 mm long and 44 mm wide.[2] The colour is grey-brown on the dorsal side, sometimes with a bit reddish, the ventral side is dirty white. The rostral horns of H. coarctatus are slightly longer and spaced further apart than in H. araneus. Chelipeds are longer than in H. araneus. The outer segment of the walking legs is often more or less furry.[2][3]
Distribution and ecology
H. coarctatus is found at both hard, stony, sandy and soft bottoms from 1 to 500 meters depth, though most often above 50 meters. H. araneus inhabits shallower depths. H. coarctatus is widely distributed in the North-East Atlantic and adjacent seas. The northern border is around the north and west coasts of Spitsbergen and Barents Sea, in the south it is found down to the north-east coast of France, and in the east to the Western Baltic Sea, the Belt Sea and the Öresund.[3]
References
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Hyas coarctatus: Brief Summary
provided by wikipedia EN
Hyas coarctatus is a marine crab species native to the North Atlantic. It is characterized by a lyriformed shell.
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Distribution
provided by World Register of Marine Species
Arctic to North Carolina
North-West Atlantic Ocean species (NWARMS)
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Habitat
provided by World Register of Marine Species
infralittoral and circalittoral of the Gulf and estuary
North-West Atlantic Ocean species (NWARMS)
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