Look Alikes
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How to Distinguish from Similar Species: The coloration of this species is distinctive. Metacrangon variabilis has a prominent longitudinal mid-dorsal ridge on abdominal segments 3-5 and the spine of its antennal scale is longer than the lamella. The anterior median carapace spine in Metacrangon acclivis is larger than the posterior spine and extends beyond the bases of the eye orbits. The pleura 1-3 of Metacrangon spinosissima have ventrally directed spines. Mesocrangon munitella has two submedian dorsal spines, and other genera of crangonids usually have none.
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Habitat
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Sand bottoms
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Distribution
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Geographical Range: Central Alaska to southern CA
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Habitat
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Depth Range: 12-230 m
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Comprehensive Description
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As with all members of shrimp Family Crangonidae, Pereopod 1 is subchelate and the carpus of pereopod 2 is not divided into several units. This species has a very short rostrum with a rounded tip and 5 pairs of legs, the dactyl of leg 5 is not broad and flattened, the carapace has two median spines and one submedian spine. The anterior median spine is not larger than the posterior and is set well back on the carapace so that it does not extend past the base of the eye orbits. Abdominal pleura 1-3 do not have ventrally directed spines, it does not have a prominent longitudinal dorsal ridge on abdominal segments 3-5, and the tip of the lamella of the antennal scale is longer than the spine. Males to 3.3 cm length, females to 4.8 mm length.
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Comprehensive Description
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Biology/Natural History: This species is nocturnal. Sometimes parasitized in the gills by the isopod Argeia pugettensis. Morphologically this species is similar to Metacrangon richardsoni from New Zealand. Genus Metacrangon have two median and one submedian spine on the carapace. The gastric region of the carapace is depressed below the other regions. The term "spinyhead" refers to the median and submedian carapace spines. Most of the spines are on the end of a supporting carina, or ridge.
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Metacrangon munita
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Metacrangon munita, commonly known as the coastal spinyhead, is a species of caridean shrimp native to the northeastern Pacific Ocean.[2]
Description
Male Metacrangon munita grow to a length of about 3.3 cm (1.3 in) and females to about 4.8 cm (1.9 in). The rostrum is short and rounded, and the carapace bears two median spines, one submedian spine on each side and a forward-pointing, hepatic spine just below and in front of the submedian spine. The anterior median spine is much shorter than the posterior one and does not extend as far as the eye sockets. There are five pairs of legs and the dactyl of the fifth leg is not wide and flattened. The pale brown and whitish disruptive coloration as well as the spines and bristles on the carapace make it difficult to discern the features of this shrimp.[2]
Distribution and habitat
This shrimp occurs in the northeastern Pacific Ocean, its range extending from Alaska southwards to southern California, its depth range being between 12 and 230 m (40 and 750 ft). It is found on sandy substrates.[2]
Ecology
This shrimp is nocturnal. A parasitic isopod sometimes attaches to its gills.[2]
References
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Metacrangon munita: Brief Summary
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Metacrangon munita, commonly known as the coastal spinyhead, is a species of caridean shrimp native to the northeastern Pacific Ocean.
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