Incidental catch in the Southern Rock Crab Trap fishery along with Kellet’s whelk, octopus, and other non-Cancer crabs 
- Carapace up to 15 cm (6 in.) across; red-brown or tan in color, with white and purple patches, and small spines [2,3]
- When disturbed, box crabs fold their legs and abdomen tightly together, so they appear like a tight box or ball 
- Calcified abdomen, with relatively short legs ; the box crab’s fifth pair of legs are small and folded under the carapace, making it seem as if it only has four pairs of legs [2,7]
- While buried, two circular holes (foramins) in the claws allow for water circulation to the gills ; this is a distinctive feature of this crab 
- The large claw, usually the right, has blunt white teeth, while the small claw has sharp teeth .
- Extends from Kodiak Island, Alaska, to San Diego, California 
- Lives in aggregations, move together, and molt at similar times within the aggregation 
- In British Columbia, has a biennial (two-year) brooding cycle; females molt and breed in mid-summer, brood eggs and larvae for 18 months, and release zoeae over ~69 days during the second winter /early spring (Feb-April) after breeding ; life cycle may be shorter and brooding may begin earlier (February) in Southern California [7,9]
- Pass through four larval stages before becoming juveniles and gaining the ability to walk 
- Low intertidal to ~600 m (1968 ft) [2,3], but usually deeper than 18 m on muddy bottoms or on rocky faces over mud .
- Scoops up mud to feed on bivalves and organic debris ; also feeds on brittle stars and sea urchins.
- Preyed upon by octopus .
- Commensal (potentially parasitic) organisms include snailfish, whose eggs and larvae can be found on crab gill filaments; and polychaete tubeworms, hydrozoans, and small bivalves on brooding and post-brooding females [2,8].
- Year round.
- California Department of Fish and Wildlife as incidental catch in the Southern Rock Crab Trap Fishery.
- Trap caught .
Status of the fishery
- Fishery first began in response to a drop in the abundance of Dungeness crab, and a rise in price for crab, in the early 1980s [7,9]
- No specific regulations for this species, but the fishery has limited entry and restricted access permits 
- Little known about population size 
Potential ecosystem impacts
- Unwanted species in traps are easily removed without injury and returned to the sea alive; Because traps are sedentary on the seafloor, little damage to the habitat occurs .
- Meat inside the claws and legs .
Description of meat
- Soft, buttery, and flakey
- Usually cooked whole, by steaming or boiling; about 25% of total weight is edible meat .
- When steaming, place the crab on its back, with its claws and legs in the air.
- Meat can be used in soups and chowders, crab cakes, or simply on its own with mild seasonings such as salt and pepper.
- Nutritional information for slender crab could not be found; shown is Dungeness crab 
- Domoic acid, a naturally occurring biotoxin in California crabs, can occasionally occur in the guts of crab during a massive harmful algal bloom. Check for warnings before buying fresh, and be sure to clean out guts before preparing.
- Available year round.
 Guinan, J., R. Curtis, 1971. A Century Of Conservation. NOAA 1(2): 40-44.
 Cowles, D., 2008. Invertebrates of the Salish Sea: Lopholithodes foraminatus. Web. https://inverts.wallawalla.edu/Arthropoda/Crustacea/Malacostraca/Eumalac.... Accessed: 27 May 2017.
 NOAA Fisheries Alaska Fisheries Science Center. Web. https://www.afsc.noaa.gov/kodiak/photo/crabboxa.htm. Accessed: 27 May 2017.
 Tuna Harbor Dockside Market. Web. http://thdocksidemarket.com/new/. Accessed 28 May 2017.
 California Department of Fish and Wildlife. Web. https://www.wildlife.ca.gov/Licensing/Commercial/Descriptions. Accessed 28 May 2017.
 Major, D. 2017. Interview with San Diego Commercial Fisherman, Dan Major. F/V Plan B. San Diego, California. 29 April 2017.
 Zhang, Z.Y., et al. 1999. A Review of the Biology and Fisheries of the Box Crab (Lopholithodes foraminatus Stimpson) in British Columbia. Fisheries and Oceans Canada. Available: http://www.dfo-mpo.gc.ca/Library/240697.pdf.
 Peden, Alex E., and Cathryn A. Corbett. 1972. Commensalism between a liparid fish, Careproctus sp., and the lithodid box crab, Lopholithodes foraminatus. Can. J. Zool. 51: 555-56.
 Kato, S. National Marine Fisheries Service. 1992. Underutilized Species: Box Crab. Available: https://swfsc.noaa.gov/publications/CR/1992/9248.PDF
 Dungeness Crab,Web. Nutritionvalue.org. Accessed: 21 September 2017.