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Pagurus granosimanus

(Grainyhand Hermit)

Overview

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Common Names

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Common Names in English:

Grainyhand Hermit, Grainyhand Hermit Crab, Granular Hermit Crab

Description

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Physical Description

Species Pagurus granosimanus

This common intertidal hermit crab is most easily distinguished by the light blue raised dots on the chelipeds and walking legs , plus the unbanded orange or red antennae. The legs of young individuals may be yellow. Carapace to 1.9 cm.[1]

Habitat

Rocky, cobbles , and among algae.[1]

Typically found in the intertidal zone at the water's edge at a mean distance from sea level of 51.54 meters (169.09 feet).[2]

Biome: Coastal.

Biology

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Reproduction

They produce 3 broods per year in the Puget Sound area. The females carry their eggs for about 55 days, and the planktonic zoea/megalops stages last about 70 days.[1]

Behavior

This species is often found in Tegula funebralis, Searlesia dira or Nucella lamellosa shells . Small individuals live in Littorina shells. It seems to prefer shells large enough that it can completely withdraw inside. It lives lower in the intertidal than does P. hirsutiusculus but higher than P. beringanus. Active mainly in the afternoon and night, and sometimes can be found in large aggregations on shallow sand bottoms .[1]

In Puget Sound this hermit is said to change shells more often than does P. hirsutiusculus, and holds onto its shells more tenaceously. It is often able to evict P. hirsutiusculus from its shell and take it over.[1]

Predators:

Predators include the black prickleback, Xiphister atropurpureus. [1]

Taxonomy

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Synonyms

Eupagurus granosimanus

Notes

Name Status: Accepted Name .

Last scrutiny: 18-Jan-2005

Similar Species

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Of the species common in the intertidal, none have the blue dots all over the legs. P. beringanus has red bands and red dots on the legs. P. hirsutiusculus has no dots and hairy legs. P. hemphilli has dark red legs with yellow spots, with a white dot at the end. P. samuelis is found only on the open coast and has red antennae and a blue band on the dactyls of legs 2 and 3. (Ref. 109953)

Members of the genus Pagurus

ZipcodeZoo has pages for 29 species and subspecies in this genus:

P. acadianus (Acadian Hermit Crab) · P. aleuticus (Aleutian Hermit) · P. armatus (Armed Hermit) · P. beringanus (Bering Hermit) · P. brandti (Sponge Hermit) · P. carolinensis (Wormreef Hermit) · P. caurinus (Greenmark Hermit) · P. confragosus (Knobbyhand Hermit) · P. cornutus (Hornyhand Hermit) · P. dalli (Whiteknee Hermit) · P. granosimanus (Grainyhand Hermit) · P. hemphilli (Maroon Hermit) · P. hirsutiusculus (Hairy Hermit) · P. hirsutiusculus hirsutiusculus (Hairy Hermit Crab) · P. impressus (Dimpled Hermit) · P. kennerlyi (Bluespine Hermit) · P. longicarpus (Long-Armed Hermit Crab) · P. ochotensis (Alaskan Hermit) · P. pollicaris (Flatclaw Hermit) · P. quaylei (Quayle's Hermit Crab) · P. rathbuni (Longfinger Hermit) · P. redondoensis (Bandclaw Hermit) · P. samuelis (Blueband Hermit) · P. setosus (Setose Hermit) · P. spilocarpus (Spotwrist Hermit) · P. stevensae (Stevens Hermit) · P. tanneri (Longhand Hermit) · P. trigonocheirus (Fuzzy Hermit) · P. undosus (Pribilof Hermit)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal February 29, 2008:

Identifiers

Footnotes

  1. Cowles, Dave. Key to Invertebrates Found At or Near The Rosario Beach Marine Laboratory (a campus of Walla Walla University) Fidalgo Island, Anacortes, WA May 2009. [back]
  2. Standard Deviation = 333.650 based on 41 observations. Terrestrial altitude and ocean depth information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 2014-11-24