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Limnoria Tripunctata Phylum: Arthropoda, Crustacea Class: Malacostraca Order: Isopoda; Flabellifera a Gribble Family: Limnoridae

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Limnoria Tripunctata Phylum: Arthropoda, Crustacea Class: Malacostraca Order: Isopoda; Flabellifera a Gribble Family: Limnoridae View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by University of Oregon Scholars' Bank Phylum: Arthropoda, Crustacea Limnoria tripunctata Class: Malacostraca Order: Isopoda; Flabellifera A gribble Family: Limnoridae Taxonomy: Limnoria was described in 1813 Antenna 1: First antenna flagellum by Leach and has been placed in a variety of with four articles and peduncle with three (Fig. isopod families since (e.g. Asellidae), until 3). Both antennae are reduced, separated at Harger erected the family Limnoriidae for it, in midline, and positioned in a nearly transverse 1880 (Menzies 1957). It was divided into two line (Fig. 1). subgenera on the basis of boring substrate Antenna 2: Second antenna and associated mouthparts (Cookson 1991). flagellum with five articles (Fig. 4). Limnoria Limnoria were the wood-borers while Mouthparts: Mandibles with file-like Limnoria Phycolimnoria were the algae-borers ridges (right) and rasping surface (left), but (Menzies 1957; Brusca 1980). Thus, lack lacina mobilis and molar processes Limnoria Limnoria tripunctata is sometimes (Brusca 1980). seen, although these subgeneric names are Pereon: rarely used today (Cookson 1991; Brusca et Pereonites: Seven total segments, al. 2007). the first of which is widest (Figs. 1, 2) and coxal plates are present on pereonites 2–7 Description (Brusca 1980). Size: Limnoriids are small and L. tripunctata Pereopods: In mature females, leaf- is no exception, reaching maximum lengths of like ooestegites are present at the base of 2.5 mm. each of first four pairs of legs and forms a Color: Light tan, whitish and often encrusted brood pouch or marsupium (see Fig. 6, with debris. Corophiurn spinicorne, this guide). General Morphology: Isopod bodies are Pleon: dorso-ventrally flattened and can be divided Pleonites: Five free pleonites with into a compact cephalon, with eyes, two fifth somite bearing three tubercles (Fig. 1). antennae and mouthparts, and a pereon Pleopods: (thorax) with eight segments, each bearing Uropods: Uropod branches dissimilar, with similar pereopods (hence the name “iso- short and claw-like exopod and long, apically pod”). Posterior to the pereon is the pleon, or blunt endopod (Fig. 6). abdomen, with six segments, the last of which Pleotelson: Ornamented pleotelson with is fused with the telson (the pleotelson) (see three anterior tubercles (“tri-punctata", Fig. 1) Plate 231, Brusca et al. 2007). The Isopoda and tuberculate posterior and lateral borders can be divided into two groups: ancestral (Fig. 5). (“short-tailed”) groups (i.e. suborders) that Sexual Dimorphism: Mature females are have short telsons and derived (“long-tailed”) conspicuous with a marsupium (see groups with long telsons. Members of the pereopods) and males with modified Flabellifera, to which L. tripunctata belongs, posterior end of the seventh pereonite (see fall into the long-tailed variety (see Fig. 86, Fig. 1, Menzies 1972). Kozloff 1993). Limnoria tripunctata individuals are able to roll into a ball and are Possible Misidentifications easily recognizable by their small size and The order Isopoda contains 10,000 species, wood-boring habits (Brusca 1980). 1/2 of which are marine and comprise 10 Cephalon: Smooth, rounded and modified suborders, with eight present from central for boring (Fig. 1). California to Oregon (see Brusca et al. Rostrum: 2007). Among isopods with elongated Eyes: Lateral and anterior (Fig. 1). telsons (with anuses and uropods that are subterminal), there are several groups (i.e. Hiebert, T.C. 2015. Limnoria tripunctata. 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/1794/12720 and full 3rd edition: http://hdl.handle.net/1794/18839 Email corrections to: [email protected] suborders) including the Valvifera, diameter throughout and have smooth walls Anthuridea, Gnathiidea, Epicaridea and (Sleeter and Coull 1973). Bite marks left on Flabellifera. wood by Limnoria species are distinct and The Flabellifera is a large measure 50–80 µm in diameter and tunnels assemblage and contains 3,000 species reach depths of 2 cm (Pitman et al. 1997). with seven families occurring locally, threeof They can completely bury themselves within which are not present north of Point wood in 4–6 days, but remain close to the Conception, California (Brusca et al. 2007). wood surface (Ricketts and Calvin 1952). Limnoriids are wood-boring species that are Salinity: A stenohaline species (Borges et al. characterized by reduced uropods, small 2014) that tolerates salinity and oxygen exopods, and a body that is less that 4 mm fluctuations as individuals occur in warm, in length (see Brusca et al. 2007 for other often salty upper bays. The ideal salinity distinguishing characters). This family range is 30–34 (in the lab, Borges et al. comprises only four local species (70 2009), but individuals tolerate salinities from described worldwide) and all are in the 12 to 48 (Menzies 1972). Other Limnoria genus Limnoria. species (e.g. L. lignorum) can't tolerate low Limnoria algarum, bores in algal salinity (15) or dissolved oxygen content holdfasts, not wood, and is the only species below 1.6 ppm. Limnoria tripunctata can with a simple incisor mandibular process, stand periodic oxygen depletion, however, lacking a file that is present in the other (Menzies 1957) and has been observed at three, wood-boring, species. Limnoria salinities of 12 near San Francisco, California, lignorum has a pleotelson with dorsal surface and can survive at salinities between 10–18. that forms a Y-shaped keel at the base while However, even L. tripunctata cannot survive L. quadripuntcata and L. tripunctata have exposure to freshwater for greater than one pleotelsons with symmetrically arranged day (Menzies 1957). anterior tubercles. The two latter species Temperature: Temperature range from 15° can be differentiated (as their names to 30°C (Beckman and Menzies 1960; suggest) by the number of tubercles present, Menzies 1972; Borges et al. 2009). Highest four in L. quadripuntcata and three in L. reproductive rates were observed between tripunctata (Brusca et al. 2007). 20–25˚C, reproduction is impaired below 10°C and egg production takes twice as long Ecological Information at 15˚C than at 20˚C (Menzies 1957, 1972). Range: Type locality is San Diego, Tidal Level: A shallow water species, L. California. Known range from Atlantic and tripunctata occurs from the water surface to Pacific coasts in temperate and tropical 18 meters deep. Individuals prefer lower waters and capable of interbreeding over depths when surface salinity is low or tidal large geographic distances (Menzies 1972) fluctuation is great. Individuals tend to prefer within a temperature range of 15–30˚C (44˚ to estuary benthos, and commonly occur at the 12° N) (Beckman and Menzies 1960). bases of pilings. Limnoria tripunctata is a well-established Associates: Limnoria burrows can be species in European coastal waters (Borges inhabited by the commensal isopod, et al. 2014). Caecijaera; the sphaeromatid isopod, Local Distribution: Oregon distribution in Gnorimosphaeroma; the amphipod, Chelura; upper bays including Coos, Yaquina, and the copepod Donsiella (Menzies 1957), Tillamook estuaries. none of which are borers. The boring Habitat: Docks and pilings, chiefly in bays mollusk, Teredo, can also co-occur in wood and estuaries, where it burrows into wood, where Limnoria burrows. After 4–6 months whether it is floating or submerged (Johnson submerged (suspended 1–4 meters above and Menzies 1956). The wood serves as the bottom), untreated wood with L. both food and protection. Limnoria tripunctata tripunctata developed a community consisting is even undeterred by creosote preserved of turbellarians, nematodes, the archiannelid wood (Menzies 1951; Ricketts and Calvin Dinophilus; the polychaete Polydora; the 1952; Borges et al. 2014) (see also Food). tanaid, Leptochelia savignyi; copepods and Within the wood, burrows are equal in amphipods (Sleeter and Coull 1973). The Hiebert, T.C. 2015. Limnoria tripunctata. 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. heterotrich ciliate Microfolliculina limnoriae, Larva: Since most isopods are direct attaches to the dorsal surface of the developing, they lack a definite larval stage. pleotelson (up to four individuals per single L. Instead this young developmental stage tripunctata). The presence of this obligate resembles small adults (e.g. Fig. 40.1, Boyko ciliate may reduce feeding rate and negatively and Wolff 2014). Most isopods develop from affect swimming, suggesting that this embryo to a manca larva, consisting of three relationship is a form of ectoparasitism stages. Manca larvae are recognizable by (Delgery et al. 2006). lacking the seventh pair of pereopods, but Abundance: The small size of individuals in otherwise resemble small adults. They this genus allows for hundreds to co-occur in usually hatch from the female marsupium at a single square inch of wood. the second stage and the molt from second to third manca produces the seventh pair of Life-History Information pereopods
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