Overview

Comprehensive Description

Biology/Natural History: Feeds on detritus and sessile invertebrates. Predators include rockfish (Sebastes atrovirens, S. chrysomelas and S. caurinus), kelp greenling Hexagrammos decagrammus, and sculpins. Seems to be often found around sea anemones. May decorate slightly by putting a few pieces of algae on its rostrum. Other algae and bryozoans seem to overgrow the carapace naturally. This crab often sits with the anterior end pointed down. Females may carry eggs nearly any time of year. May reproduce several times a year. This species has a terminal molt so full-grown adults will no longer grow (and the carapace can become overgrown)

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Source: Invertebrates of the Salish Sea

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This majid crab has a flattened rostrum that is longer than wide and is widest near the middle. The carapace is triangular, has a projection or lump near the two posterolateral corners, but has no sharp projection or shelf on the anterolateral margin. The chelipeds of males are usually longer than the walking legs, slender, and tipped with orange. When at rest the crab often sits with its chelae near its mouth and its very long "elbows" projecting out in front. The carapace is brown or tan but may be overgrown with sponges and bryozoans. Carapace width to 4.5 cm.
  • Wicksten,Mary K., 2009. ; Decapod Crustacea of the Californian and OregonianZoogeographic Provinces. ; UC San Diego Scripps Institution of OceanographyLibrary, Scripps Institution of Oceanography. ; http://escholarship.org/uc/item/7sk92dz ;418 pages. ; Published online only. ; This excellent key coversdecapods (crustaceans such as crabs, shrimp, spiny lobsters, hermit crabs,and crayfish) from shallow and deep water from Puget Sound south to thePacific coast of Baja California. ; Includes many subkeys, drawings,and photos. ; No glossary, table of contents, or index. ; Thisis the place to go for the most up-to-date key for decapods. ; MaryWicksten plans to publish an updated version of this key soon.   http://www.wallawalla.edu/academics/departments/biology/rosario/inverts/Annotated_Bibliography.html#Wicksten+2009 External link.
  • Jensen, Gregory C., 1995. ;Pacific Coast Crabs and Shrimps. ; Sea Challengers, Monterey, CA. ;87 pp. ; ISBN 0-930118-20-0. ; This paperback contains excellentpictures and brief descriptions of many crabs and shrimp from along thePacific coast. ; Sections are arranged by animal group. ; Includesa short glossary.   http://www.wallawalla.edu/academics/departments/biology/rosario/inverts/Annotated_Bibliography.html#Jensen+1995 External link.
  • Hart, Josephine F.L., 1982. ;Crabs and their relatives of British Columbia. ; British Columbia ProvincialMuseum Handbook 40. ; Paperback. ; 267 pages. ; This smallpaperback contains keys and individual descriptions and drawings of 95species of true crabs, hermit crabs, other anomurans, mud and ghost shrimp(but not shrimp or prawns) found off British Columbia. ; An introductiongives an extensive discussion of the general biology and anatomy of crabsand other similar crustaceans, including topics such as sexual dimorphism,larvae, and parasites. ; A variety of drawings and tables are included. ;The general characteristics of each of the families included in the bookare discussed. ; Keys to the families of each section (Thalassinidea,Anomura, Brachyrua) are included but one needs to know beforehand whichsection the animal is in. ; Keys are also included for the membersof each family. ; A useful key for the serious student wanting to identifycrabs.   http://www.wallawalla.edu/academics/departments/biology/rosario/inverts/Annotated_Bibliography.html#Hart+1982 External link.
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Source: Invertebrates of the Salish Sea

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Distribution

Geographical Range: Kodiak, Alaska to Punta San Carlos, Mexico. Uncommon south of Monterey Bay, CA

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Source: Invertebrates of the Salish Sea

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Physical Description

Look Alikes

How to Distinguish from Similar Species: Oregonia bifurca and Hyas lyratus have a lyre-shaped body and a toothed expansion of the carapace on both sides of the anterior half, plus the rostrum is widest at the base. Pugettia gracilis, Pugettia producta, and Pugettia richii have a sharp projection to the side near the middle of the carapace.
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Source: Invertebrates of the Salish Sea

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Ecology

Habitat

Depth range based on 17 specimens in 1 taxon.
Water temperature and chemistry ranges based on 15 samples.

Environmental ranges
  Depth range (m): 0 - 49.65
  Temperature range (°C): 9.481 - 10.151
  Nitrate (umol/L): 5.634 - 7.636
  Salinity (PPS): 31.856 - 32.147
  Oxygen (ml/l): 6.534 - 6.656
  Phosphate (umol/l): 0.943 - 1.137
  Silicate (umol/l): 14.539 - 18.436

Graphical representation

Depth range (m): 0 - 49.65

Temperature range (°C): 9.481 - 10.151

Nitrate (umol/L): 5.634 - 7.636

Salinity (PPS): 31.856 - 32.147

Oxygen (ml/l): 6.534 - 6.656

Phosphate (umol/l): 0.943 - 1.137

Silicate (umol/l): 14.539 - 18.436
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Depth Range: Mostly subtidal, to 220 m

Habitat: Rocky areas, especially around boulders densely covered with invertebrates. Sometimes found on pilings.

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Source: Invertebrates of the Salish Sea

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Scyra acutifrons

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 2 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

GTAGGAACATCTTTA---AGATTAATTATTCGAGCTGAACTTGGACAACCAGGTACTCTTATTGGTAAC---GATCAAATTTATAATGTTGCTGTAACAGCACATGCTTTTGTTATAATTTTTTTTATAGTTATACCTATTATAATTGGAGGATTTGGAAATTGACTTATTCCTCTTATA---TTAGGTGCCCCTGATATAGCCTTTCCACGTATAAATAATATAAGATTTTGACTTCTTCCTCCTTCTCTAACACTACTCTTAATAAGAGGAATAGTTGAAAGAGGAGTCGGAACTGGATGAACTGTTTATCCACCTTTAGCAGCTGCTATTGCTCACGCCGGAGCTTCGGTTGATATAGGA---ATTTTTTCTTTACACTTATCTGGGGTATCTTCTATTTTAGGAGCAGTAAATTTTATAACAACTGTAATTAATATGCGATCATTTGGTATAACTATAGATCAAATACCCTTATTTGTTTGAGCTGTGTTTATTACAGCAATTTTACTACTTCTTTCTTTGCCTGTTTTAGCTGGG---GCTATTACTATGCTTCTTACTGATCGTAATCTTAATACTTCTTTTTTTGATCCTGCTCGAGGAGGAGATCCTATTCTATATCAACAC
-- end --

Download FASTA File
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Scyra acutifrons

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 5
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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