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Heptacarpus Paludicola Class: Malacostraca Order: Decapoda a Broken Back Shrimp Section: Caridea Family: Thoridae

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Heptacarpus Paludicola Class: Malacostraca Order: Decapoda a Broken Back Shrimp Section: Caridea Family: Thoridae Phylum: Arthropoda, Crustacea Heptacarpus paludicola Class: Malacostraca Order: Decapoda A broken back shrimp Section: Caridea Family: Thoridae Taxonomy: Local Heptacarpus species (e.g. Antennae: Antennal scale never H. paludicola and H. sitchensis) were briefly much longer than rostrum. Antennular considered to be in the genus Spirontocaris peduncle bears spines on each of the three (Rathbun 1904; Schmitt 1921). However members of Spirontocaris have two or more segments and stylocerite (basal, lateral spine supraorbital spines (rather than only one in on antennule) does not extend beyond the Heptacarpus). Thus a known synonym for H. first segment (Wicksten 2011). paludicola is S. paludicola (Wicksten 2011). Mouthparts: The mouth of decapod crustaceans comprises six pairs of Description appendages including one pair of mandibles Size: Individuals 20 mm (males) to 32 mm (on either side of the mouth), two pairs of (females) in length (Wicksten 2011). maxillae and three pairs of maxillipeds. The Illustrated specimen was a 30 mm-long, maxillae and maxillipeds attach posterior to ovigerous female collected from the South the mouth and extend to cover the mandibles Slough of Coos Bay. (Ruppert et al. 2004). Third maxilliped without Color: Variable across individuals. Uniform expodite and with epipods (Fig. 1). Mandible with extremities clear and green stripes or with incisor process (Schmitt 1921). speckles. Color can be deep blue at night Carapace: No supraorbital spines (Bauer 1981). Adult color patterns arise from (Heptacarpus, Kuris et al. 2007; Wicksten chromatophores under the exoskeleton and 2011) and no lateral or dorsal spines. are related to animal age and sex (e.g. Rostrum: Well-developed, longer mature and breeding females have prominent than carapace, extending beyond antennular color patters) (Bauer 1981). Five morphs peduncle (Fig. 2). Rostral teeth include both were described by Bauer (1981) for both H. dorsal (6–8, seven in current specimen, Fig. sitchensis and H. paludicola, including four 1) and ventral (2–4, two in current specimen, color morphs and one transparent morph. Fig. 1). Dorsal edge of rostrum straight, not Adults may exhibit camouflaging colors based curved with anterior teeth. on surrounding algae (Bauer 1981), but color Teeth: Rostral teeth present (see patterns may be more or less fixed Rostrum). (genetically) and variably expressed in Pereopods: Pereopods 1–2 with different environments (Bauer 1982). epipods. Epipod morphology is particularly General Morphology: The body of decapod relevant to the genus Heptacarpus and crustaceans can be divided into the species with a higher number are considered cephalothorax (fused head and thorax) and ancestral to the group (Bauer 1984b). abdomen. They have a large plate-like Pereopods 3–5 with bifid dactyls with spines carapace dorsally, beneath which are five arranged as follows: merus of pereopod pairs of thoracic appendages (see chelipeds three with five spines, pereopod four with four and pereopods) and three pairs of spines and pereopod five with 2–4 spines maxillipeds (see mouthparts) (Kuris et al. (Wicksten 2011). Second legs chelate, nearly 2007). The abdomen and associated equal, with seven annulations on carpus (Fig. appendages are outstretched in Heptacarpus 1). species and the abdomen usually has a sharp Chelipeds: Equal, chelate (Fig. 1). bend (“broken-back shrimp” Kozloff 1993). Abdomen (Pleon): Shrimp-like, with fantail, Cephalothorax: body laterally compressed. Side plates of Eyes: second segment overlap those of first with Hiebert, T.C. 2015. Heptacarpus paludicola. 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/1794/12712 and full 3rd edition: http://hdl.handle.net/1794/18839 Email corrections to: [email protected] sharp bend (Fig. 1). The third segment pleura that is rounded, fourth segment with without hump and the sixth segment is shorter tooth and fifth with spine (Wicksten 2011). than telson (Fig. 1). Segments 1–3 with Telson & Uropods: Telson bears 4–5 pairs (Ricketts and Calvin 1971), while H. of dorso-lateral spines (Wicksten 2011) (Fig. paludicola is more common in mudflats and in 1). eelgrass. Sexual Dimorphism: Females often have Heptacarpus taylori, also has a short broader and larger bodies than males, which rostrum, reaching just to the eye and is often have compressed and squat bodies brightly colored, with a series of teeth from (Wicksten 2011). anterior carapace margin to the apex. Heptacarpus brevirostris, with smooth rostrum Possible Misidentifications (without lower teeth) that reaches only the first The family Hippolytidae was split into three segment of the antennal peduncle. The families following a cladistic analysis by merus of H. brevirostris has a single spine on Christoffersen (1987) that are currently pereopods 3–4. Heptacarpus palpator is recognized by some (e.g. Wicksten 2011), but similar to Heptacarpus brevirostris, but with a not all authors (e.g. Kuris et al. 2007). These longer rostrum that can be di- or trifid, and a three families include the Lysmatidae, longer antennal scale (Wicksten 1986). Hippolytidae and Thoridae. The Lysmatidae Heptacarpus stimpsoni, from Puget Sound, are characterized by very long antennular has rostrum that extends over eye (only flagella. The three families can further be slightly), with dorsal teeth and pereopod (3–5) distinguised by the number of carpal articles dactyls that are simple and curved. on the second pereopod: 22 or more in Heptacarpus carinatus is a long-rostrumed Lysmatidae, three in Hippolytidae and seven shrimp, with distal rostral teeth (3–7 dorsal in Thoridae. In addition, Thoridae and and 2–6 ventral) and epipods present on Hippolytidae can be differentiated by their pereopods 1–3. Heptacarpus franciscanus, supraorbital spines, one in the latter and 0–4 from San Francisco Bay, has a rostrum longer in the former family (Wicksten 2011). The than the carapace. Heptacarpus pugettensis, Lysmatidae is represented by a single H. flexus, and H. tenuissimus have a hump on species locally, Lysmata californica (Kuris et the third abdominal segment. Heptacarpus al. 2007; Wicksten 2011). When following the pugettensis has epipods on pereopods 1–2 above taxonomy (Christoffersen 1987; and a rostrum that just reaches the end of the Wicksten 2011), local members of the first segment of antennular peduncle and not Hippolytidae include Hippolyte californiensis beyond. Heptacarpus flexus is and H. clarki. Meanwhile, the genus morphologically similar to H. carinatus, but Heptacarpus, with eleven local species, falls with epipods on pereopods 1–2 only and a within the Thoridae, as do the local species narrow rostrum with teeth (4–5 dorsal and 5– Lebbeus lagunae and Spirontocaris prionota 8 ventral). Heptacarpus tenuissimus lacks (Kuris et al. 2007; Wicksten 2011). teeth on the ventrum of the fourth abdominal Very close in color, morphology, and pleon and also lacks an exopod on the third habitat preference is Heptacarpus sitchensis, maxilliped (see dichotomous key in Wicksten whose adult rostral teeth are 4–8/0–5, but 2011 for Heptacarpus species). whose rostrum, while it can reach to the middle of the antennal scale, does not reach Ecological Information to the end of the scale as does that of H. Range: Type locality is Humboldt Bay, paludicola. The rostral teeth are closer California. Known range includes Tava together on H. sitchensis and the rostrum is Island, Alaska to San Diego, California more slender (Schmitt 1921), as well as being (Schmitt 1921; Wicksten 2011). only equal to or shorter than the carapace. Local Distribution: Coos Bay distribution Our H. sitchensis specimens were only 1.5 near, and south of, the Charleston Bridge in cm, half the size of the female H. paludicola. South Slough. Heptacarpus sitchensis is the most commonly Habitat: South Slough amongst mud and found transparent shrimp in tide pools eelgrass (Zostera, Ulva), also on pilings, Hiebert, T.C. 2015. Heptacarpus paludicola. 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. floats and in tide pools of outer coasts (Kuris to microbial fouling and parasites. Grooming et al. 2007; Wicksten 2011). with specialized antennal brushes is found in Salinity: Collected at salinity 30. members of the Stenopodidea, Caridea and Temperature: Dendrobranchiata and suggests a common Tidal Level: Collected at +0.15 m and is ancestor rather than evolutionary intertidal to 10 m depths (Wicksten 2011). convergence (see Bauer 1989). Associates: Abundance: Common to abundant (Schmitt Bibliography 1921; Kuris et al. 2007). 1. BAUER, R. T. 1979. Sex attraction Life-History Information and recognition in the caridean shrimp Reproduction: Ovigerous female found in Heptacarpus Paludicola (Holmes) March, in South Slough, Coos Bay. Males (Decapoda, Hippolytidae). Marine and females may be (weakly) attracted to Behaviour and Physiology. 6:157-174. each other with sex phermones (Bauer 1979), 2. —. 1981. Color patterns of the shrimps but are generally only triggered to initiate Heptacarpus pictus and Heptacarpus copulation after physical contact
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