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Cancer Antennarius Class: Malacostraca Order: Decapoda Pacific Rock Crab Section: Brachyura Family: Cancridae

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Cancer Antennarius Class: Malacostraca Order: Decapoda Pacific Rock Crab Section: Brachyura Family: Cancridae Phylum: Arthropoda, Crustacea Cancer antennarius Class: Malacostraca Order: Decapoda Pacific rock crab Section: Brachyura Family: Cancridae Taxonomy: The most recent taxonomic maxillipeds with distal margin and rounded debate regards this species being placed in angles in C. antennarius (Wicksten 2011). the recently elevated genus, Romaleon Carapace: Oval and widest at eighth (Schweitzer and Feldmann 2000). However, tooth. Antero-lateral and postero-lateral molecular work does not always support the margins meet at distinct angle. Carapace monophyly of this or other cancrid genera surface lumpy, uneven and finely granulated (Harrison and Crespi 1999). Although many (Fig. 1). researchers have switched to the name R. Frontal Area: Frontal area not antennarius (or R. antennarium) (e.g., produced with five medial (three central) Wicksten 2011), we follow the most current teeth, of which the outer pair is the largest, local intertidal guide that retains the name center tooth small (Fig. 2) (Kuris et al. 2007; Cancer antennarius (Kuris et al. 2007). Wicksten 2011). Teeth: 11 antero- and post-lateral Description teeth are curved forward (Fig. 2). Size: Females up to 148 mm in carapace Perepods: Walking legs rough and width and males 178 mm (Puls 2001). Type hairy. Dactyls with five longitudinal rows of specimen carapace is 118 mm in width bristles (Rathbun 1930). (Rathbun 1930). Chelipeds: Chelae heavy, nearly Color: Reddish color dorsally, light yellow smooth and black-tipped. Inner carpus (wrist) ventrally with red spots, especially frontally with single sharp spine. Chelipeds can be (Ricketts and Calvin 1971). Chelae dactyls slightly unequal in size (Wicksten 2011). dark (Wicksten 2011) (Fig. 1). Abdomen (Pleon): Abdomen narrow in General Morphology: The body of decapod male, broad in female (e.g. see Cancer crustaceans can be divided into the magister, Fig. 3). cephalothorax (fused head and thorax) and Telson & Uropods: abdomen. They have a large plate-like Sexual Dimorphism: Male and female carapace dorsally, beneath which are five brachyuran crabs are easily differentiated. pairs of thoracic appendages (see chelipeds The most conspicuous feature, the abdomen, and pereopods) and three pairs of is narrow and triangular in males while it is maxillipeds (see mouthparts). The abdomen wide and flap-like in females. Additionally, and associated appendages are reduced and males have one large chelae and two pleopod folded ventrally (Decapoda, Kuris et al. 2007). pairs specialized for copulation however, the Cephalothorax: third and fourth pleopods are absent. Eyes: Eyestalks short, orbits small. Females, on the other hand, have all four Eyes are frontal with a small supra-orbital pleopod pairs, each with long setae for egg tooth (Fig. 1). attachment (Brachyura, Kuris et al. 2007). Antennae: Mouthparts: The mouth of decapod Possible Misidentifications crustaceans comprises six pairs of According to some authors, the genus appendages including one pair of mandibles Cancer comprises 23 species (Harrison and (on either side of the mouth), two pairs of Crespi 1999 but see Schweitzer and maxillae and three pairs of maxillipeds. The Feldmann 2000). This genus is maxillae and maxillipeds attach posterior to differentiated from other brachyuran genera the mouth and extend to cover the mandibles by the broadly oval carapace, presence of (Ruppert et al. 2004). Merus of third five frontal teeth and antennules that fold Hiebert, T.C. 2015. Cancer antennarius. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. A publication of the University of Oregon Libraries and the Oregon Institute of Marine Biology Individual species: http://hdl.handle.net/1794/12696 and full 3rd edition: http://hdl.handle.net/1794/18839 Email corrections to [email protected] back over carapace. Characters unique to Canada to Baja, California. Not common in Cancer antennarius include 11 antero-lateral Puget Sound. teeth, carapace widest at 8 tooth, red color, Local Distribution: In Coos Bay (and black-tipped cheliped dactyls and small size probably other Oregon estuaries) individuals (Kuris et al. 2007). Cancer antennarius is are most common on protected outer coast. smaller than most of the other adult Cancer Habitat: Often buried in the sand and under species. In color, C. productus is most rocks (Ricketts and Calvin 1971). similar to C. antennarius (dark red, black- Salinity: In San Francisco, found at salinities tipped chelae), but never has red spots on its ranging from 26.6 to 33.3 (Schmitt 1921). underbody, though its legs may be mottled. Cancer antennarius cannot tolerate brackish They also occur in the same ecological conditions and cannot osmoregulate (Garth niches. Furthermore, C. productus has ten and Abbott 1980). teeth (not 11). Cancer antennarius is also Temperature: In San Francisco Bay, smaller than C. productus, and lacks its individuals collected at 8.7–14.3° C (Schmitt obviously pronounced frontal area. 1921). There are eight Cancer species known Tidal Level: Occurs in lower tide pools locally (Kuris et al. 2007). Cancer magister (Ricketts and Calvin 1971) and subtidally to (adults at least 30 mm in width), C. productus 91 m (Kittredge et al. 1971; Puls 2001). (adults over 20 mm in width) and C. Associates: Often encrusted with antennarius (adults typically 100 mm in width) polychaetes (family Iphitimidae) in branchial are the largest species. Cancer productus cavities (southern California) (Kuris et al. and C. magister have 10 antero-lateral teeth 2007). and five subequal frontal teeth (Kuris et al. Abundance: Common in California and 2007). The carapace of C. magister is widest Oregon, becomes rarer farther north. at the tenth tooth, is more subtly pigmented and does not have black tipped dactyls seen Life-History Information in C. productus (Schmitt 1921; Kuris et al. Reproduction: Mating occurs when the 2007; Wicksten 2011). female is about to molt, male C. antennarius The remaining four species tend to be clasp females several days prior to molting smaller and have nine antero-lateral teeth and copulation takes place after molting (sometimes ten in older specimens, Wicksten occurs. In the lab, males were stimulated to 2011). Cancer branneri is a small species (35 pre-mating behavior by the release of a mm) that is rare intertidally and recognizable molting hormone by Pachygrapsus crassipes by cheliped dactyls that are long, straight, (Kittredge et al. 1971). Fertilization is internal, black and spiny. Cancer gracilis (27 mm) has occurs after molting and egg deposition white-tipped cheliped dactyls and C. jordani occurs months later (November–January, (25 mm) has a hairy carapace and sharp Ricketts and Calvin 1971). Females with curving teeth. Cancer anthonyi, the yellow eggs were encountered in Humboldt Bay, rock crab, is larger than the previous three at California in April (Puls 2001). All decapod 52 mm and has black-tipped cheliped dactyls crustacean females attach recently laid (Kuris et al. 2007; Wicksten 2011). gelatinous egg masses to their pleopods. Populations of C. productus, C. anthonyi The outer embryo membrane thickens and a (southern California) and C. magister support strand develops that attaches each embryo to commercial fisheries (Kuris et al. 2007). pleopod setae (Decapoda, Kuris et al. 2007). Cancer antennarius is a common species Larva: The larvae of C. antennarius were used in biochemistry and physiology studies described by Roesijadi (1976). Larval (e.g. Spaziani et al. 1997; Kang and Spaziani development proceeds via a series of zoea 1996; Rudolph and Spaziani 1991). (five total, telson with single lateral spine at each fork, Lough 1975) and megalopae Ecological Information stages, each marked by a molt (Roesijadi Range: Type locality is San Francisco. 1976). Cancer antennarius zoea are Known range includes British Columbia, planktotrophic and have large compound eyes and four spines: one each dorsal and Hiebert, T.C. 2015. Cancer antennarius. In: Oregon Estuarine Invertebrates: Rudys' Illustrated Guide to Common Species, 3rd ed. T.C. Hiebert, B.A. Butler and A.L. Shanks (eds.). University of Oregon Libraries and Oregon Institute of Marine Biology, Charleston, OR. rostral and two lateral (Fig. 3b) (see Fig. 4, Bibliography Roesijadi 1976; Puls 2001; Martin 2014). Larval size (measured from tip of rostrum to 1. GARTH, J. S., and D. P. ABBOTT. tip of telson) proceeds from 1.8 mm (Zoea I) 1980. Brachyura: the true crabs, p. to 4.4 mm (Zoea V) (Puls 2001). Megalopae 594-630. In: Intertidal invertebrates of are 2.3–3.3 mm from rostrum tip to posterior California. R. H. Morris, D. P. Abbott, carapace and 1.4–2.4 mm in width. The and E. C. Haderlie (eds.). Stanford megalopae bear one stout spine on University Press, Stanford, CA. ischiopodite of cheliped and exhibit similar 2. HARRISON, M. K., and B. J. CRESPI. morphology to the larvae of C. gracilis (Puls 1999. Phylogenetics of Cancer crabs 2001). The larvae of cancrid species are (Crustacea : Decapoda : Brachyura). difficult to distinguish, especially the prezoeal Molecular Phylogenetics and stages (Fig. 3a), but the zoea and megalopae Evolution. 12:186-199. of C. antennarius are smaller and possess 3. KANG, B. K., and E. SPAZIANI. 1996. fewer setae than other species. In larvae Uptake of high-density lipoprotein by reared at 13.8˚C, hatching from the fifth zoeal Y-organs of the crab, Cancer stage to the megalopa occurred at 36 days, antennarius. 1. Characterization in which is shorter than observed for C. magister vitro and effects of stimulators and or C. productus (Roesijadi 1976). inhibitors. Archives of Insect Juvenile: Juvenile C. antennarius may have Biochemistry and Physiology. 31:106- second small spine on carpus. Their 106. carapace is widest at the ninth tooth, the tenth 4. KITTREDGE, J. S., M. TERRY, and F. (and last) tooth is prominent and shiny. T. TAKAHASHI. 1971. Sex Carapace is crowded with granules.
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