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Further Record of the Shallow Water Mysid Heteromysis Proxima W. M

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Further Record of the Shallow Water Mysid Heteromysis Proxima W. M CRUSTACEAN RESEARCH, NO. 41: 11–18, 2012 10 T. TAKAHASHI & S. GOSHIMA This study concentrated on the basic 355. biology of C. isopus in Hakodate Bay, but ———, 1955b. The life cycle of the isopod Idotea Further record of the shallow water mysid Heteromysis this species is distributed widely throughout emarginata (Fabricius). Journal of Animal proxima W. M. Tattersall, 1922 (Mysida) from the Malacca Japan (Nunomura, 1995, 2011), and it is Ecology, 24: 270–281. Nunomura, N., 1995. Isopoda. In: S. Nishimura (ed.), Strait known that the breeding period and its Guide to Seashore Animals of Japan with Color extension are different among habitats. Pictures and Keys. Vol. II, Hoikusha, Osaka, Similar studies in different regions and in 205–233. (In Japanese) other related species are necessary to reveal ———, 2011. Crustaceans No. 2, Isopoda. Special Yukio Hanamura, Ryon Siow, Alias Man and Faizul Mohd Kassim the factors that affect the particularly plastic Publication of the Toyama Science Museum, No. life history traits of isopods. Such plasticity 24. Toyama Science Museum. (In Japanese) may well be the key to the success of this Orton, J.H., 1920. Sea-temperature, breeding and distribution in marine animals. Journal of the Abstract.—Heteromysis proxima W.M. species across its latitudinal range. O.S. Tattersall, 1967; H. singaporensis O.S. Marine Biological Association of the United Tattersall, 1922 (Mysida) was first reported from Tattersall, 1967; H. (Olivemysis) thailandica Kingdom, 12: 339–366. the Gulf of Manaar, off the south-eastern coast of Fukuoka & Murano, 2002; and Heteromysis Acknowledgments Robertson, A.I. & Mann, K.H., 1980. The role India. A recent sledge net survey conducted on the sp. sensu O.S. Tattersall, 1967 (Müller, 1993; of isopods and amphipods in the initial We would like to express our appreciation north-western coast of Malaysia yielded several Fukuoka & Murano, 2002; Sawamoto & fragmentation of eelgrass detritus in Nova specimens of this little-known mysid from a to the members of the Laboratory of Scotia, Canada. Marine Biology, 59: 63–69. Fukuoka, 2005). This gives the impression sandy beach located in the mouth area of Merbok Benthology, Faculty of Fisheries, Hokkaido Salemaa, H., 1979. Ecology of Idotea species of comparatively poor heteromysid diversity University, for their advice and cooperation (Isopoda) in the northern Baltic. Ophelia, 18: River, facing the Malacca Strait. Although the in South-East Asian waters compared with during this study. We are thankful to the 133–150. Malaysian specimens have a comparatively more than 20 species that have been found anonymous reviewers and Roberto C. Sheader, M., 1977. The breeding biology of Idotea smaller body size than those recorded from in the northern part of Australia (Băcescu India, the morphological features of these Lombardo for their reviews and comments pelagica (Isopoda: Valvifera) with notes on & Bruce, 1980; Băcescu, 1983; Murano, the occurrence and biology of its parasite specimens essentially agree with the typical ones. 1988, 1998b). The fewer recorded species, that helped to improve the manuscript. Clypeoniscus hanseni (Isopoda: Epicaridea). This paper provides further information on the however, may be due to the paucity of Journal of the Marine Biological Association of morphological characteristics of H. proxima on surveys, and this region is still considered to Literature Cited the United Kingdom, 57: 659–674. the basis of newly obtained specimens and extends Strong, K.W. & Daborn G.R., 1979. Growth and be an intriguing and unstudied field for many its geographical range to the Malacca Strait. Hastie, L.C., Nyegaard, M., Collins, M.A., Moreno, energy utilization of the intertidal isopod Idotea coastal marine life forms, including mysid A., Pereira, J.M.F., Piatkowski, U., & Pierce, baltica (Pallas) (Crustacea: Isopoda). Journal of G.J., 2009. Reproductive biology of the loliginid crustaceans. Experimental Marine Biology and Ecology, 41: During the hyperbenthic crustacean squid, Alloteuthis subulata, in the north-east 101–123. Introduction Atlantic and adjacent waters. Aquatic Living Suzuki, M., Watanabe, K., & Mukai, H., 2002. The genus Heteromysis S.I. Smith, 1874 surveys conducted in the coastal waters of Resources, 22: 35–44. Feeding habits and growth of an isopod, Idotea includes a large group of mysid crustaceans north-western Malaysia since 2004, several Healy, B. & O’Neill, M., 1984. The life cycle ochotensis Brandt, in Akkeshi Bay, Hokkaido, (Mysida), currently numbering some 80 specimens of the little-known heteromysid and population dynamics of Idotea pelagica northern Japan. Japanese Journal of Benthology, species world-wide (Anderson, 2010; Price H. proxima W.M. Tattersall, 1922 were found and I. granulosa (Isopoda: Valvifera) in south- 57: 13–20. (In Japanese with English abstract) & Heard, 2011). Heteromysis is regarded as at a shallow depth in the mouth of Merbok east Ireland. Journal of the Marine Biological Sywula, T., 1964. A study of the taxonomy, ecology Association of the United Kingdom, 64: 21–33. a highly adaptable group which is able to River, north-western Peninsular Malaysia. and geographical distribution of species of the thrive in diverse habitats, from open waters This rare heteromysid species is re-described Johnson, W.S., Stevens, M., & Watling, L., 2001. genus Idotea Fabricius (Isopoda, Crustacea) in the Reproduction and development of marine Polish Baltic. Ecological and zoogeographical to cryptic environments such as submarine on the basis of newly captured material, peracaridans. Advances in Marine Biology, 39: part. Bulletin de la Société des amis des sciences caves; some are even known to live in a providing supplementary information on 105–260. et des letters de Poznań (série B), 4: 173–199. commensal lifestyle with a variety of marine their morphology and as a new distribution Jormalainen, V., Tuomi, J. & Merilaita, S., 1992. invertebrates (Tattersall, 1967; Müller, 1993; record. Mate choice for male and female size in aquatic Fukuoka, 2005). Morphologically, this genus The body length (BL) was measured isopod Idotea baltica. Annales Zoologici Fennici, Addresses: (TT, SG) Graduate School of 29: 161–167. is remarkable among the mysids, as they from the anterior end of the rostral plate to Kjennerud, J., 1950. Ecological observations on Fisheries Sciences, Hokkaido University, 3-1-1 normally have a sub-chelate endopod, similar the posterior end of the telson excluding the Idotea neglecta G.O. Sars. Universiteteti Bergen. Minato-cho, Hakodate 041-8611, Japan. to those found in amphipods, in the third apical spines. The terminology in the setal/ Årbok (Naturvitenskapelig rekke), 7: 5–47. E-mails: (TT) tomohiro-takahashi@ thoracic limb. spine system followed Watling (1989). Lee, W.L., 1966. Color change and the ecology of the support99.com; (SG) [email protected]. To date, four species of Heteromysis, The specimens dealt with here have been marine isopod Idotea (Pentidotea) montereyensis ac.jp including one yet undetermined species, deposited in the National Museum of Nature Maloney, 1933. Ecology, 47: 930–941. Naylor, E., 1955a. The diet and feeding mechanism have been recorded from the Malacca Strait and Science, Tokyo (NSMT), and Fisheries Received: 17 February 2011. of Idotea. Journal of the Marine Biological and its neighbouring region: H. minuta Research Institute, Penang (FRI) Association of the United Kingdom, 34: 347– Accepted: 29 March 2012. FuRTHER RECORD OF HeterOMysis prOxiMa 13 12 12 ET AL. Taxonomic Account Y. HANAMURABasal segment of antennular peduncle of Family Mysidae Haworth, 1825 female (Fig. 1d) sub-equal to combined Genus Heteromysis S.I. Smith, 1874 length of anterior 2 segments when measured Heteromysis proxima W.M. Tattersall, along medial margin; second segment 1922 slightly shorter than half length of basal (Figs. 1, 2) one and distinctly shorter than wide; third segment slightly shorter than wide and again a Heteromysis proxima W. M. Tattersall, 1922, 496, longer than second one, bearing a few simple fig. 26; Pillai, 1965: 1726, fig. 93; ?Murano, setae around distomedial part. b 1998a: 52, fig. 6. Antennal scale (Fig. 1e) oval with rounded apex falling slightly short of anterior Material examined.—Two males (BL end of antennular peduncle, about 3.0 times 3.2 mm, 4.3 mm), 1 female (BL 3.8 mm), as long as wide, with setose margins; distal 1 ovigerous female (BL 4.2 mm), (NSMT- suture present; peduncle long, reaching Cr 22217), and 1 male (BL 3.0 mm) (FRI Cr or slightly overreaching anterior end of f 009), sandy shore off Merdeka Beach, mouth antennular peduncle. of Merbok River (N 05˚40.2´, E 100˚22.2´), Labrum (Fig. 1f) with anterior margin Kedah State, Malaysia, depth 1.0–2.5 m, sub-triangular, without discernible median sledge net, salinity 31.34 (psu), 7 Oct 2005, tooth or spine. Mouth parts not dissected. coll. Y. Hanamura. Ventral sternites (Fig. 1h) with distinct c Descriptions.—Body moderately robust lobular projections on third to seventh (Fig. 1a). somites, fourth one appreciably smaller and Carapace (Fig. 1a, b) slightly and evenly more slender than remaining ones. convex in lateral view, surface smooth Endopod of third thoracopod in male without discernible ornamentation; anterior (Fig. 1g) rather massive, ischium with flexor dorsal part produced into somewhat sharp margin smooth, with a few simple setae; e triangular rostral plate curving ventrally, merus about 2.5 times as long as maximum lateral margin of rostral plate concave, height, bearing about 6 flagellate denticles covering basal part of eye stalk; cervical along flexor margin; carpo-propodus slightly sulcus very shallow but feebly defined at more than 2.0 times as long as maximum anterior one-third; posterior dorsal margin height, with extensor margin distinctly excavate, leaving last thoracic somite visible convex in lateral view, without setae or dorsally: anterior ventral corner rounded; spines, flexor margin nearly straight in lateral lateral wing of carapace well developed, fully view, its distal corner with about 4 flagellate d covering thoracic somites and first abdominal denticles, 2 stout simple setae, and single somite in lateral aspect.
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