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Idotea Wosnesenskii Class: Malacostraca Order: Isopoda Family: Idoteidae

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Idotea Wosnesenskii Class: Malacostraca Order: Isopoda Family: Idoteidae Phylum: Arthropoda, Crustacea Idotea wosnesenskii Class: Malacostraca Order: Isopoda Family: Idoteidae Taxonomy: The genus Idotea was described pod”). Posterior to the pereon is the pleon, or by Fabricius in 1798, and although originally abdomen, with six segments, the last of which spelled Idotea, several authors adopted the is fused with the telson (the pleotelson) (see spelling Idothea, since then. The genus Plate 231, Brusca et al. 2007). The Isopoda Pentidotea was described by Richardson in can be divided into two groups: ancestral 1905 and was reduced to subgeneric level by (“short-tailed”) groups (i.e. suborders) that Menzies in 1950. The two subgenera (or have short telsons and derived (“long-tailed”) genera), Pentidotea and Idotea differ by the groups with long telsons. Valviferan articles on maxilliped palps, the former with (including the Idoteidae) isopods have an five and the latter with four (Miller and Lee elongated telson (Fig. 73, Ricketts and Calvin 1970), but are not always currently 1952). Idotea wosnesenskii individuals are recognized (Rafi and Laubitz 1990). robust, not tapered, elongate and depressed Furthermore, this character may vary with age (see Fig. 62, Ricketts and Calvin 1952). and other characters may reveal more Cephalon: Wider than long, with frontal concrete differences to define the two (Poore margin slightly concave (Miller 1968) and and Ton 1993). Thus synonyms for I. posterior portion somewhat wider than wosnesenskii include, Idothea wosnesenskii, anterior portion (Richarson 1905). Head Pentidotea wosnesenskii and Idotea narrower than pleon (Schultz 1969). First Pentidotea wosnesenskii. We follow the most thoracic segment fused with head (Isopoda, recent intertidal guide for the northeast Pacific Brusca et al. 2007). coast (Brusca et al. 2007), which uses the Rostrum: Frontal process widely name Idotea wosnesenskii. angulate and hidden by and not extending beyond frontal lamina, which is triangulate (in Description dorsal view) (Fig. 2). Size: Individuals to 35 mm in length (Hatch Eyes: Eyes small, reniform (kidney- 1 1947) and ½ to /3 as wide as long (Fee 1927; shaped) (Miller 1975) (Fig. 4), compound, Ricketts and Calvin 1952). The figured transversely ovate and situated at extreme specimen (male) is 22 mm long. A 22-mm lateral margins (compare to M. entomon, this male weighs approximately 0.3 grams and a guide), about halfway between the anterior similar sized female weighs 0.2 grams (wet and posterior margins (Fig. 1). weight). Antenna 1: First antennae Color: Dark green or light olive and some (antennules) with four articles, basal one individuals living amongst red algae are dark large and flattened. red and gray (Fee 1927). Males tend to be Antenna 2: Second antennae with larger and paler than females (Welton and peduncle of five articles and flagellum of 12– Miller 1980). Color polymorphism is high in 16 articles (Fig. 1). the congener, I. baltica and variation is Mouthparts: Maxilliped palp with five determined by habitat and predation pressure articles and one coupling hook (Miller 1975). but not sexual selection (Jormalainen and Pereon: Body elongate and depressed with Merilaita 1995). thorax composed of seven segments (Brusca General Morphology: Isopod bodies are et al. 2007). dorso-ventrally flattened and can be divided Pereonites: All seven thoracic into a compact cephalon, with eyes, two somites (pereonites) are free (Idoteidae) with antennae and mouthparts, and a pereon epimeral sutures visible dorsally (except the (thorax) with eight segments, each bearing first somite) (Fig. 1). Postero-lateral border of similar pereopods (hence the name “iso- last pereonite acute (Fig. 1). Hiebert, T.C. 2015. Idotea wosnesenskii. 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/1794/12716 and full 3rd edition: http://hdl.handle.net/1794/18839 Email corrections to: [email protected] Pereopods: Seven pairs of developed coxal plates, the absence of ambulatory and similar walking legs. mandibular palps, occasionally fused Pleon: Short pleon with six pleonites (Brusca pleonites and males with modified sexual et al. 2007). Pleon with two complete and appendages arising from the first pleonite, one partial intersegmental suture dividing it rather than the thorax. This suborder into three divisions. Pleon wider than head includes three local families and 34 species: (Schultz 1969). the Chaetiliidae (see Mesidotea entomon, Pleonites: Two small anterior this guide), the Arturidae and the Idoteidae. pleonites and a large shield-like pleotelson The Arturidae is composed of species with with an incompletely fused pleonite near its narrow but cylindrical bodies, with the base (Fig. 1) (Miller 1975). The first pleonite anterior four pleopods larger and less setose with acute lateral borders and shorter laterally than the posterior three. Characteristics of than medially (Miller 1975; Kozloff 1974) (Fig the Idoteidae include a dorso-ventrally 1). compressed body, similar pereopods, and Pleopods: Seven pleopod pairs are seven free pereonites and is composed of 22 ambulatory, nearly similar and all with small species, locally (Brusca et al. 2007). sharp claws. Male pereopods with coarse Most local species in the Idoteidae are hairs (Figs. 1, 4) and females with hair only on within the genus Idotea (12 species), which propodi. Appendages of the pleon include includes those with a pleon composed of two five respiratory pairs and a single pair of complete and one incomplete pleonite(s), a uropods (Brusca et al. 2007). The first three maxillipedal palp with five articles and one pairs are particularly locomotory (e.g. for coupling seta, eyes that are not elongated swimming), while the posterior two pairs are transversely and a large shield-like pleotelson strictly respiratory (Alexander 1988; (Brusca et al. 2007). Idotea sensu Poore and Alexander et al. 1995), although all five pairs Ton 1993 refers only to individuals with free can also function in ventilation as water is pleonites, anterior spiniform pereopod setae passed through the branchial chamber with a and free penes, while many northeastern total of three strokes (Alexander 1991). Pacific species have fused pleonites, partially Uropods: Ventral, not visible dorsally, and fused penes and reduced coxae (Poore and forming opercular plates or valves. Ton 1993). Based on these characters, Pleotelson: Large, shield-like, broadly authors differentiate Idotea from Pentidotea rounded (Hatch 1947), and ends in large blunt (see Taxonomy). point (Fig. 1). Among the Idotea, I. urotoma, I. Sexual Dimorphism: Conspicuous sexual rufescens, and I. ochotensis have a dimorphism is rare among isopods, however, maxilliped palp with four articles (rather than males tend to be larger, paler, and have five in the remaining eight Idotea species) a hairier legs than females in I. wosnesenskii. character that previously defined two sub- Mature females are broader and bear a genera, Idotea Idotea (with four articles) and thoracic marsupium while males have Idotea Pentidotea (with five articles) (Menzies modified first pleopods, called gonopods 1950; Miller and Lee 1970). (Sadro 2001; Boyko and Wolff 2014). Of the Idotea species with five maxilliped palp articles (Idotea Pentidotea, Possible Misidentifications Menzies 1950), I. aculeata, a reddish idoteid The order Isopoda contains 10,000 species, with a long projection on its narrowing 1/2 of which are marine and comprise 10 pleotelson. It has oval eyes (not reniform), suborders, with eight present from central long antennae and blunt lateral borders on California to Oregon (see Brusca et al. the first pleonite (compare to acute borders as 2007). Among isopods with elongated in I. wosnesenskii). Idotea montereyensis is telsons (with anuses and uropods that are slender and small (up to 16 mm), red, green- subterminal), there are several families brown, or black and white and is found on including Flabellifera, Anthuridea, Phyllospadix species and red algae. It has a Gnathiidea, Epicaridea and Valvifera. The rounded telson and with a short projection. It Valvifera are characterized by hinged doors differs from I. wosnesenskii in the frontal or valves covering the pleopods, well- process, which is narrow, pointed and Hiebert, T.C. 2015. Idotea wosnesenskii. 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. projects much beyond the frontal lamina. The temperature barriers for other invertebrates frontal lamina is triangulate (compare to (Wallerstein and Brusca 1982). I. wosnesenskii, frontal process and Fig. 2). Tidal Level: Upper middle intertidal zone to Male I. montereyensis are long and slim and 16 m deep. The figured specimen was females are broader, and more like I. collected at 0.0 meters. wosnesenskii in outline. Idotea schmitti has Associates: Associates include the pleonite one with acute lateral borders as in I. gastropod Tegula, brachyurans Hemigrapsus wosnesenskii, but the anterior margin of species and Cancer oregonensis, and the pereonite one does not encompass the carnivorous gastropod, Nucella. Often co- cephalon. Idotea stenops
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