FAMILY OREGONIIDAE
Taxon Authority Garth, 1958
Common Names Spider Crabs
Taxonomy Decapoda Brachyura Majoidea
Species list Chionoecetes angulatus Rathbun, 1924 Triangle Tanner Crab Chionoecetes bairdi Rathbun, 1924 Tanner Crab Chionoecetes tanneri Rathbun, 1893 Grooved Tanner Crab Hyas lyratus Dana, 1851 Pacific Lyre Crab Macoregonia macrochira Sakai, 1978 Deep Sea Giant Spider Crab Oregonia bifurca Rathbun, 1902 Splitnose Crab Oregonia gracilis Dana, 1851 Graceful Decorator Crab
Geographic Range
Morphology
Subtriangular to subpyriform. pseudorostral spine long, slender. Preorbital spine absent. Postorbital spine large, remote from eye. Basal antennal segment narrow. Ambulatory legs of moderate size. First gonopod with bulbous base, distally lanceolate, longitudinally grooved with rows of filamentous setae on either side of groove. Abdominal segments free-articulated in both sexes. Male abdomen terminally widened. Telson deeply inserted into segment 6. Type genus: Oregonia Dana, 1851.
References
Citation: Davie, P. (2012). Oregoniidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=254358 on 2013-03-15
Stevcic, Z. 2005. The reclassification of Brachyuran crabs(Crustacea, Decapoda, Brachyura) Nat. Croat. Vol.14, Suppl. 1: 1-159. Zagreb. Geographic Range Sea of Okhotsk and Bering Sea to Oregon; from 90 to 2974 m. Distribution in British Columbia: West of continental shelf from 1069 to 2430 m
Habitat Deep water, soft bottom, mud, sand or ooze
Morphology Carapace: slightly wider than long. surface finely pubescent with numerous spines and granules.Llateral margins armed with large spines and posterior with granules. There are two rows of spines on each branchial area which meet to form a V at an angle of about 45"; the junction is marked with a stout spine on the lateral margin. Branchial area dilated but interbranchial space little depressed. Pereopods: P2-5 compressed with rows of sharp spines; meri slightly dilated proximally.
Size Carapace: male 135 X 152 mm;
Coloration Adults scarlet; juveniles white.
Synonyms
Remarks Easily Confused with [i]C. tanneri[/i], but usually caught in deeper water.
References
Citation: Davie, P. (2012). Chionoecetes angulatus Rathbun, 1924. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=442161 on 2013-02-11
Hart, J.F.L. 1982. Crabs and their relatives of British Columbia. British Columbia Provincial Museum Handbook 40. Victoria, British Columbia.
Wicksten, Mary K., 2012. Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces. 307 pp. Magnolia Press.
Geographic Range Southeastern Bering Sea, to Winchester Bay, Oregon; from 6 to 474 m. Distribution in British C0lumbia: In fjords and other muddy channels.
Habitat Mud; usually in less than 200 m
Morphology carapace: slightly wider than long with spines on anterior lateral margins; branchial areas slightly dilated but surface relatively flat with granular knobs forming a symmetrical pattern. pereopods: Chelipeds short with small spines and granules; palm swollen and elongate; fingers with cutting surfaces of many small sharp teeth. P2-5 with merus inflated and margins with many small spines; carpus also spined.
Size Carapace: male 121 X 139 mm; female 74 X 81 mm
Coloration Carapace with red granules and lateral spines orange, and cream ventrally. Chelipeds with gold iridescence, pinkish brown dorsaily with maroon spines; ventrally pink; fingers white with red stripes and orange at hase. Walking legs brown, white, shellpink and orange with red stripes dorsally; dactyls reddish. Eyestalk mudbrown and pink; cornea reddish with black pigment.
References
Citation: Davie, P. (2012). Chionoecetes bairdi Rathbun, 1924. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=368558 on 2013-02-11
Hart, J.F.L. 1982. Crabs and their relatives of British Columbia. British Columbia Provincial Museum Handbook 40. Victoria, British Columbia.
Wicksten, Mary K., 2012. Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces. 307 pp. Magnolia Press.
Geographic Range East of Kamtchatka, northwest Pacific Ocean, to off Cortez Bank, Mexico; 29 to 144 m. Distribution in British Columbia: West of the continental shelf from 458 to 1784 m.
Habitat Deep water, green mud, fine sand, rocks.
Morphology carapace: slightly wider than long: surface spìnulose; margins armed with spines which are largest mid-laterally. Branchial areas dilated and separated medially by a deep depression; the rows of spines on each branchial area form a U with the curve at the outer margin and marked by 2 large spines. pereopods: Hands of mature males with dilated palms. P2-5 compressed and have rows of sharp spines; meri slightly dilated.
Size Carapace: male 167 X 185 mm; female 119 X115 mm
Coloration Carapace scarlet. with some orange pink and white in immatures. Chelipeds orange with scarlet spines; finger tips light pink with white cutting teeth. Walking legs scarlet with yellow-brown claws. Abdomen light orange or brownish. Antennules, antennae and eyestalks scarlet; cornea chocolate brown.
References
Citation: Davie, P. (2012). Chionoecetes tanneri Rathbun, 1893. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=442165 on 2013-02- 11
Hart, J.F.L. 1982. Crabs and their relatives of British Columbia. British Columbia Provincial Museum Handbook 40. Victoria, British Columbia.
Wicksten, Mary K., 2012. Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces. 307 pp. Magnolia Press.
Geographic Range Bering Sea to Puget Sound, Washington; 9 to 640 m. Distribution in British C0lumbia: Widely distributed
Habitat Mud, sand and rocks. Often masked with encrusting algae and invertebrates.
Morphology eye: Stalk with tubercle on anterior surface. antenna: Base with large rounded knob on distal part. rostrum: flattened, bifid and horns separated by narrow fissure. carapace: sublyrate in shape; fine granules over surface which is somewhat inflated medially and on branchìal areas; elevations have rows of larger knobs. Carapace and appendages w/ numerous hooked setae dorsally. pereopods: Chelipeds of mature male stout and longer than walking legs; P1 of females and immature males, shorter. P2-5 slender and cylindrical. decreasing slightly in length posteriorly.
Size Carapace: male 105 X 80 mm; female 63 X 46 mm.
Coloration Carapace mud-brown with orange median stripe and white in grooves. Rostrum white and orange. Chelipeds white, brown and orange; fingers white with orange streaks; teeth and tips white. Walking legs white, orange and brown; claws tan. Antennules and antennae greybrown with base of antennular flagella and antennal flagellum scarlet. Eyestalks brown and white; cornea yellowish with black slit.
References
Citation: Davie, P. (2012). Hyas lyratus Dana, 1851. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=442167 on 2013-02-11
Hart, J.F.L. 1982. Crabs and their relatives of British Columbia. British Columbia Provincial Museum Handbook 40. Victoria, British Columbia.
MACROREGONIA MACROCHIRA
Geographic Range Nintoku Seamount in the Emperior Seamount Chain British Columbia: Juan de Fuca Ridge
Habitat Deep water, abyssal, on undersea ridges and sea mounts.
Morphology (An extremely large spider crab) rostrum: The rostral spines are short and simple, widely separated by a U-shaped frontal sinus. eye: No orbit is formed. The eye-stalk is basally surrounded by the upper orbital eave and the basal segment of the antenna. carapace: is suboblong or lyrate, anteriorly broadened; dorsal surface markedly swollen. The dorsal surface is extremely convex and its regions well delimited. The gastric, cardiac and intestinal regions are clearly separated from each other by deep grooves. The entire dorsal surface is tuberculated； the tubercles are few in the median area but are thick and pointed on the lateral and posterior surfaces. There are two tiny spinules side by side on the anterior gastric area. pereopods: Thoracic legs are very long and cylindrical. The chelipeds of full-grown male are much longer than the P2’s. The arm, wrist and palm are thickly and uniformly covered with tubercles, the fingers are compressed,sulcate and the prehensile edges are cut into numerous thin obtuse teeth. P2-5 are almost subequal in length,however, the first pair is longest. All segments are thickly covered with tubercles and the merus is set with a series of procurved spinules along anterior and posterior borders. abdomen: is seven-segmented in both sexes; that of male is broad and distally broadened, the terminal tergum short and transversely subovate, invaginated to the preceeding tergum. (Fig. 3).
Size Male holotype length of carapace, measured in the median line: 122 mm, width of same107 mm; length of rostral spine l6 m; total length of cheliped 470 mm，that of 1st ambulatory leg 420 mm
Coloration Uniformly bright red.
References
Citation: Davie, P. (2012). Macroregonia macrochira Sakai, 1978. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=442169 on 2013-02- 11
Sakai, T. 1978. Decapod crustacea from the Emperor Seamount chain. Researches on Crustacea, no. 8 Supplement. 1-39
OREGONIA BIFURCA
Geographic Range Sea of Okhotsk, northwestern Pacific Ocean, to off mouth of Columbia River, Washington; 494 to 1463 m. Distribution in British Columbia: One record off Englefield Bay, Queen Charlotte Islands at 1204 m.
Habitat Deep Water, green mud, broken shell, grey sand
Morphology rostrum: Short divergent horns. eye: Stalk short, not reaching tips of triangular forward pointing post-orbital spines carapace: Setose, finely granulate and spiny and wider, anteriorly, than 0. gracilis.. pereopods: Chelipeds of male only slightly longer than walking legs; of female slighiíy shorter. All pereopods setose.
Size Carapace: male 34 X 23 mm; female 29 X 21 mm.
Coloration Carapace deep pink with red patches; rostrum and post-orbital spines red. Chelipeds pink and brown with red on inner distal part of palm: fingers brown with red stripe on proximal half of both faces; teeth brown wíth red stripes and patches ventrally; claw pale yellow. Antennule and antenna crimson; flagella translucent. Outer maxilliped crimson and brown. Eyestalk pale brown, cornea black.
Remarks The small size and deep-water habitat results in this species being rarely caìlected or recognized.
References
Citation: Davie, P. (2012). Oregonia bifurca Rathbun, 1902. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=442170 on 2013-02-11
Hart, J.F.L. 1982. Crabs and their relatives of British Columbia. British Columbia Provincial Museum Handbook 40. Victoria, British Columbia.
OREGONIA GRACILIS
Geographic Range Japan and Bering Sea, south to Monterey Bay, California; intertidal to 436 m. Distribution in British C0lumbia: Common.
Habitat lntertidal in dense seaweed. Common in deeper water, in muddy, pebbled or rocky locations.
Morphology eye: Stalk slender, subequal in length to postorbìtal spines which are lanceolate and point forward; cornea spherical. carapace: subtriangular with numerous knobs with hooked setae or stiff bristles and slender elongate rostral horns. pereopods: Chelipeds of mature male longer than walking legs, of female, shorter. P2-5 long and slender with numerous hooked setae and stiff bristles.
Size Carapace: male 66 X 39 mm; female 45 X 33 mm
Coloration Carapace light brown or white with tan patches, masked by curved, brown hooked setae and bristles to which many dead or living objects are attached. Chelipeds white, mottled with light brown; finger pink or orange distally. Walking legs brown, deeper dorsally. Abdomen and sternum pale brown with some orange. Eyestalk grey and white; cornea red-brown.
Synonyms Oregonia hirta Dana, 1851 Oregonia longimana Spence Bate, 1864
Remarks Adult males and females are sufficiently different in appearance that they were originally consiqered to be different species : O. gracilis and O. hirla .
References
Citation: Davie, P. (2012). Oregonia gracilis Dana, 1851. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=442171 on 2013-02-11
Hart, J.F.L. 1982. Crabs and their relatives of British Columbia. British Columbia Provincial Museum Handbook 40. Victoria, British Columbia.
Wicksten, Mary K., 2012. Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces. 307 pp. Magnolia Press.