A total of 17 marine, a freshwater and 10 terrestrial isopod crustaceans were reported from Aomori Prefecture. And many of them are considered to be warm elements. Among them, a new species of gnathiid isopod crustacean is described as Gnathia mutsuensis, based on single male specimen

NUNOMURA, Noboru

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Title Isopod crustaceans collected from Aomori Prefecture NorthernJapanAuthor(s)NUNOMURA, NoboruCitationContributions from the Biological Laboratory, KyotoUniversity (2004), 29(4): 351-360Issue Date2004-07-21URL http://hdl.handle.net/2433/156416RightType Departmental Bulletin PaperTextversionpublisherKyoto UniversityContr. bioL Lab. Kyoto Univ., Vol. 29, pp. 351-360. Issued 21 July 2004Isopod crustaceans collected from Aomori Prefecture Northern Japan               Noboru NUNOMURAToyama Science Museum, Nishi nakano-machi, Toyama, 939-8084, JapanABSTRACr A total of 17 marine, a freshwater and 10 terrestrial isopod crustaceans werereported from Aomori Prefecture. And many of them are considered to be warrn elements. Amongthem, a new species of gnathiid isopod crustacean is described as Gnathia mutsuensis, based onsingle male specimen.KEY WORDS Isopoda / Gnathiidea / new species / Gnathia mutsuensis / Aomori / Mutsu BayIntroduction     The taxonomy on isopod crustaceans has hitherto been ignored in Aomori Prefecture.Therefore, I carried out faunal surveys of marine isopods including splash zones and shoreforests at several areas along the coast of Mutsu Bay, Aomori Prefecture in the summer of1983 and in fall of 1984 (Fig. 1). Adding these, a series of specimens of isopod crustaceanswere at my disposal for my study and identification through the courtesy of Dr. MakotoTsuchiya of Asamushi Marine Biological Station.      As to the terrestrial species, I could examine several samples collected from theareas around the Mt. Iwaki, which had been sent from Prof. Yoshiaki Nishikawa. Besidesthe above-mentioned specimens, I could examine specimens sent from some other scientists.The specimens studied in this study will be deposited at the Toyama Science Museum.     As the results of the above-mentioned surveys, 17 marine, 1 freshwater and 10terrestrial species are enumerated. Among them, a new species of gnathiid isopodcrustacean is described as Gnathia mutsuensis, based on a single male specimen.Results                             Order Isopoda                           Suborder Gnathiidea                            Family Gnathiidae                         Gnathia mutsuensis n. sp.                  (Japanese name: Mutsu-umikuwagata, new)     Material examined: ldn (holotype 2.1 mm in body length including mandibles butexcluding both antennae) form intenidal shore of Asamushi, Aomori-shi, coll. MakotoTsuchiya, July 8, 1983. Holotype is deposited at the Toyama Science Museum (TOYA Cr-13050). No female orjuvenile specimens have been collected.352 N. NUNOMURAv sci{gei   '•ecÅqJUniko ANamiuchjAsarn-ushiNonaiPref.sFig. 1. Map showing the main colleting sites.     Description: Body rather slender, 3.3 times as long as wide. Body color white inalcohol. Cephalon O.8 times as long as wide, with a small projection at atnero-meidal partand sharp protruded projection at antero-lateral angle. Eyes relatively big, each eye withabout 37 ommatidia. Pleotelson triangular with 2 setae at apical margin.     Antennule (Fig. 2B): Peduncle 3-segmented; first and second segments rectangutar;third segment a little longer than the second, with 6-7 setae on distal margin. Eagellum 4-segmented and slender, segment 3 with an aesthetasc and terminal segment with 3aesthetascs.     Antenna (Fig. 2C) approximately 1.4 times longer than antennule. Peduncle 4-segmented; segment 1 with a protuberance at dista1 angle; last peduncular segment long andwide with 10 long setae. Eagellum 7-segmented and slender, with 7-8 relatively long setae.     Mandible (Fig. 2D) stout and triangular; armed carina and mandibular setae lacking:armed carina lacking; mandibular blade with 5-6 teeth; mandibular incisura lacking; dorsalsulcus small; supra denticles lacking; mediofronta1 process small; spraocular lobes small.Isopods ofAomori Prefecture in Northern Japan 353EFig. 2. Gnathia mutsuensis n. sp. Holotype. A, Dorsal view; B, Antennula;, C, Antenna; D,Mandible; E, Maxilliped; F, Pylopod; G-K, Pereopods 1-5; L, Uropods.     Maxilliped (Fig. 2E) 5-segmented; segment 1 wide and lacking setae; segment 2square, with 3 setae; segment 3 square, with 7 setae; segment 4 square, 314 as long assegment 3, with 6 setae; terminal segment slender, with 7 setae around the margin.     Pylopod (Fig. 2F) 2-segmented; segment 1 wide and triangular, with more than 35setae on margin; segment 2 small and round.     Pereopod 1 (Fig. 2G): basis rectangular, with 2 plumose setae and 3 simple setae onouter margin and 6 setae on inner margin; ischium slender and shorter than basis, with 8setae; merus short with 3 protuberences and 2 longer ones at the posterior margin; carpus354 N. NUNOMURAslender and 2stout ad 2 simple setae; propodus long, with a seta at inner distal margin;dactylus relatively long.     Pereopod 2 (Fig. 2H) a little shorter than pereopod 1: basis rectangular, with 6 setaeon both margins; ischium 3/5 as long as basis, with 4 setae on inner margin and 2 setae onouter margin; merus with 3 peg-like protuberances on inner margin; carpus a little shorterthan merus, with 4-5 setae and a stout seta on inner margin; propodus 1.7 times longer thanmerus, with severa1 setae; dactylus long.     Pereopod 3 (Fig. 2I) as long as pereopod 2; basis with 4 long setae on inner margin;ischium with 4 peg-like protuberances and 3-4 setae on inner margin and 5-6 setae on outermargin; merus 2 peg-like protuberances and 3-4 relatively short setae on inner margin and3-4 setae at outer distal angle carpus 4 setae on inner margin and a seta at outer distal angle;propodus with 5-6 setae on inner margin and 2 relatively long setae on outer margin.     Pereopod 4 (Fig. 2J) as long as pereopod 3: basis with 6-7 setae on inner martin and2 setae on outer margin; ischium, with 4 setae on inner margin and 3 setae on outer margin;merus with 2 peg-like protuberances and 3 short setae on inner margin and 2 setae at outerdistal angle; carpus 1.4 times longer than merus, with 45 setae on inner margin at dista1angle; propodus with 6-7 setae on outer margin.     Pereopod 5 (Fig. 2K) a little longer than pereopod 4: basis rectangular, ischium with4-5setea on inner margin and 3 setae on outer margin; merus with a peg-like seta and 4short setae on inner margin and 4 setae at outer distal angle; carpus 6 setae on inner margin,a stout seta at inner distal angle; propodus with 8-10 setae on inner margin     Uropod (Fig. 2L) basis; endopod with 8 long plumose setae around the margin;exopod as long as endopod, with 9 long plumose setae around the margin.     Etymology: The species is named after the old name of Aomori Prefecture.     Remarks: The present species is most closely allied to Gnathia sanrikuensisNunomura from the sea off Iwate Prefecture, but the former is separated from the latter inthe following features: (1) shape of cephalon, (2) larger eyes, (3) acuter supraocular lobe ofcephalon, (4) bifurcated medio-fronta1 process of cephalon, (5) absence of mandibular setae,and (6) numerous plumose setae on both uropodal rami.     The present new species is closely allied to Gnathia hirayamai Nunomura reportedfrom Amakusa, but the former is separated from the latter in the following features: (1)presence of small but remarkable mediofrontal process in the anterior part of cephalon, (2)lacking of mandibular incisura, (3) presence of small but remarkable supraocular lobe at theantero-lateral part of cephalon, (4) presence of mandibular blade, (5) presence of peg-likeprotuberances on pereopods, (6) bigger eyes with more ommatidia, and (7) less numeroussegmentation of antenna.          Suborder Asellota           Family JaniridaeIaniropisis tongiantenata Thielemann, 1910    (Japanese name: Umi-mizumushi)Isopods ofAomori Prefecture in Northern Japan 355     MaterialNunomura.examined: 7 exs., Asamushi, Aomori-shi, June 13, 1983, coll. Noboru     MaterialTsuchiya.examined:         Family Janiridae  Jaeropsis lobuta Richardson, 1899(Japanese name: Hirata-umimizumushi)1 ex., Asamushi, Aomori-shi, date unknown, coll. Makoto     MaterialShigeru Nakao.                Suborder Anthuridea                  Family Anthuridae     Cyathura sp. (aff. muromiensis Nunomura,examined: 10 99, Lake Jfisan-ko, Shiura-mura,1976) Aug. 8, 1975, coll.                             Family Paranthuridae                      Paranthurajaponica Richardson, 1909                       (Japanese name: Yamato-uminanafushi)     Material examined: 4 exs., coastal and rocky shore and Zbstera zone, June 15, 1983,coll. Noboru Nunomura; 1 ex., Sep. 29, 1984, coll. Noboru Nunomura; 2 exs., Yokohama,June 15, 1979, coll. Makoto Tsuchiya; 3 exs., Asamushi, Aomori, date unknown, coll.Makoto Tsuchiya.                        Colanthura nigra Nunomura, 1975                   (Japanese name: Kuro-ashharazu-uminanafushi)     Material examined: 1 ex., sea 10m off Asamushi, Aomori-shi, and Aomori-shi June 6,1979, coll. Makoto Tsuchiya.                              Suborder Valvifera                               Family Idoteidae                          Idotea ochotensis Brandt, 1851                       (Japanese name: Ohotsku- heramushi)     Material examined: 7 exs., Asamushi, Aomori-shi, June 13, 1983, co!1. NoboruNunomura; 1 ex, Asamushi, Aomori-shi, June 15, 1983, coll. Noboru Nunomura; 1 ex.Asamushi, Aomori-shi, June 16, 1983, coll. Noboru Nunomura; 7 exs., Ohura nearAsamushi, Aomori-shi, July 7, 1997, coll. Makoto Tsuchiya; 8 exs., Yokohama, June 15,1979, coll. Makoto Tsuchiya; 1 ex., Asamushi, Aomori-shi, June 13, 1983, coll. KatsutoshiItoo.Material examined    Cleantiella isopus (Grube, 1883)     (Japanese name: Iso-heramushi): 1 ex., Asamushi, Aomori-shi, July 15, 1983, coll. Noboru356 N. NUNOMURANunomura; 2 exs; Asamushi, Aomori-shi, Aomori-shi, June 16, 1983, coll. NoboruNunomura; 1 ex., Urata, Aomori-shi, June 14, 1979, coll. Makoto Tsuchiya; 3 exs., Hiranai-machi, coll. Makoto Tsuchiya; 2 exs., Asamushi, Aomori-shi, June 13, 1983, coll.Katsutoshi Ito.     MaterialTsuchiya.examined        Family ChaetilidaeSymmius cautlatus Richardson, 1904  (Japanese name: Yaribo-heramushi):1 ex., off Asamushi (8m in depth), Sep. 12, 1978, coll. Makoto                             Suborder Flabellifera                              Family Cirolanidae                     IVatatolanaJ'aponensis (Richardson, 1904)                      (Japanese name: Yamato-sunahorimushi)     Material examined: 1 ex., off Asamushi, Aomori-shi, June 15, 1983, coll. NoboruNunomura; 16 exs., off Asamushi, Sep 12, 1978, coll. Makoto Tsuchiya; 27 exs., offAsamushi, Aomori-shi (6-30 m in depth), Sep. 21, 1978, coll. Makoto Tsuchiya; 1 ex.,Asamushi, Aomori-shi, June 15, 1983, coll. Noboru Nunomura; 3 exs., Asamushi, Aomori-shi, Aug. 15, 1983, coll. Makoto Tsuchiya.                      Excirolana chiltoni (Richardson, 1905)                       (Japanese name: Hime-sunahorimushi)     Material examined: 2 exs., Nonai, Aomori-shi, Sep. 10, 1980, coll.Nunomura; 10 exs., Kanita, Kanita-machi, July 23, 1980, coll. Noboru Nunomura;Kanayazawa, Mutsu-shi, Sep. 30, 1984.Noboru12 exs.,Material examined:           Family AegidaeAega antillensis Schioedte & Meinert, 1879  (Japanese name: Menaga-gusokumushi)1 9 , Mutsu Bay. data unknown, coll. Makoto Tsuchiya.                            Family Sphaeromatidae                       Cymodocejaponica Richardson, 1907                      (Japanese name: Nihon-kotsubumushimi)     Material examined: 20e599, Yokohama-machi, Sep. 30, 1984, coll.Nunomura; 3 exs., intertidal zone, Asamushi, Aomori-shi, June 15, 1983, coll.Nunomura; 1 ex., Asamushi, Aomori-shi, Aug. 15, 1983, coll. Makoto Tsuchiya.NoboruNoboru                Gnorimosphaeroma rayi Hoestlandg 1969                   (Japanese name: Iso-kotsubumushi)Material amined: 5 exs., intertidal zone, Hadakajima, Asamushi, Aomori-shi, June 16,Isopoals ofAomori Prefecture in Northern Japan 3571983; coll. Noboru Nunomura; 6 exs., Karibazawa, June 15, 1979, coll. Makoto Tsuchiya;8 exs., Yokohama, June 15, 1979, coll. Makoto Tsuchiya; 1 ex., Moura, June 14, 1983, coll.Noboru Nunomura; 3 exs., Namiuchi, June 13, 1979, coll. Makoto Tsuchiya; 7 exs.,Shirasuna, June 14. 1979, coll. Makoto Tsuchiya; 6 exs. Urata, Hiranai-machi, June 14.1979, coll. Makoto Tsuchiya; 31 exs., Kanita, Kanita-machi, July 23, 1987, coll. NoboruNunomura; 30 exs, Yasaku, Aomori-shi, July 23, 1984 coll. Noboru Nunomura; 13 exs.,Nonai, Aomori-shi, July 23, 1984, coll. Noboru Nunomura; 3 exs., Arihata, Yokohama-machi. Sep. 30, 1984, coll. Noboru Nunomura.                   Gnorimosphaeroma ovatum (Richardson, 1933)                       (Japanese name: Maru-kotsubumushi)     Material examined: 18 exs., Amidagawa, Yomogida-mura, July 23, 1984,Noboru Nunomoura. 2 exs., Ohura, Aomori-shi, June 7, 1977, coll. Makoto Tsuchiya.coll.                Gnorimosphaeroma nakeongense Kwon & Kim, 1987                       (Japanese name: Chosen-kotubumushi)     Material examined: 3 exs., Minmaya, June 19, 1983, coll. Noboru Nunomura; many,Koshiguchi-no--ike, Juniko, Iwasaki-mura, July 1, 1996, coll. Noboru Nunomura.                         Dynoldes dentisinus Shen, 1929                        (Japanese name: Shiriken-umisemi)     Material examined: 6cjn di99 9, Asamushi, Aomori-shi, July 7, 1983,Tsuchiya; 9 exs., Asamushi, Aomori-shi, Mar. 1989, coll. Makoto Tsuchiya.coll. Makoto                    Leptosphaeroma gottcshei Hilgendorf, 1885                         (Japanese name: Hirata-umisemi)     Material examined: 10 exs., intertidal zone, Asamushi, Aomori-shi, June 16, 1983,coll. Noboru Nunomura; 30 exs., intertidal zone, Hadakajima, Asamushi, Aomori-shi, 1 ex.,off Asamushi, Aomori-shi, June 15, 1983, coll. Noboru Nunomura; Aomori-shi, June 16,1983, coll. Noboru Nunomura; 1 ex., Asamushi, Aomori-shi, June 6, 1979.                                Family Ligiidae                            Ligia exotica Roux, 1828                           (Japanese name: Funamushi)     Material examined: 5 exs., Asamushi, Aomori-shi, Jun. 15, 1983, coll. NoboruNunomura; 19, Aburakawa, July 23, 1984, coll. Noboru Nunomura; 18 exs., Jfisan-ko,Shiura-mura, July 30, 1976, coll. Shigeru Nakao, 2 exs., Asamushi, Aomori-shi, Sep. 29,1984, coll. Noboru Nunomura; 1 ex. Kanita, Kanita-machi, June 14, 1983, coll. NoboruNunomura.Ligia cinerascens Budde-Lund, 1828  (Japanese name: Kita-funamushi)358 N. NUNOMURA     Material examined: 1 ex., Arihata,Asamushi, Aomori-shi, June 13, 1983,July 23, 1984, coll. Noboru Nunomura;coll. Noboru Nunomura.Yokohama-machi, coll. Noboru Nunomura; 4 exs.,coll. Noboru Nunomura; 19, Nonai, Aomori-shi, 1di39 9, Asamushi, Aomori-shi, June 14, 1983,                        Ligldiumjaponicum Verhoeff, 1918                         (Japanese name: Hime-funamushi)     Material examined: 2cl c{"99 9, Kanagi-machi, 260-280 m above sea level; 39 \,Mt. Iwaki, Sep. 24, 1977. Coll. Yoshiaki, Nishikawa; 2di di99 9 Mt Iwaki, 1300-1350 ma. s. 1., Sep. 24, 1977, coll. Yoshiaki Nishikawa.     MaterialNunomura.                Family Trichoniscidae       Haplophthalmus danicus Budde-Lund, 1879           (Japanese name: Naga-warajimiushi)examined: 4 exs., Asamushi, Aomori-shi, June 16, 1983, coll. Noboru                              Family Scyphacidae                    ArntadiUoniscusjaponicus Nunomura, 1984                     (Japanese name: Nihon-hama-warajimiushi)     Material examined: 5 exs., Asamushi, Aomori-shi, June 13, 1983, coll. NoboruNunomura; 14 exs., Asamushi, Aomori-shi, July 27, 1984, coll. Noboru Nunomura; 1 ex.,Hiranai, July 23, 1984, coll. Noboru Nunomura; 9 exs., coll. Noboru Nunomura     MaterialNunomura.     MaterialNunomura.examined   Detonellajaponica Nunomura, 1984   (Japanese name: Hamabe-warajimushi): 2 exs., Asamushi, Aomori-shi, June 16, 1983,                 Family Phylosciidae       Lutorophiloscia nipponensis Nunomura, 1986         (Japanese name: Nihon-hiiro-warajimushi)examined: 6 exs. Asamushi, Aomori-shi, June 14, 1983,coll.coll.NoboruNoboru                             Family Porcellionidae                         Porcellio scaber Latreille, 1804                          (Japanese name: Warajimushi )     Material examined: lc]99 9, Asamushi, Aomori-shi, June 15, 1983, coll. NoboruNunomura; 58c{ny1 9, Asamushi, Aomori-shi, June 13, 1983, coll. Noboru Nunomura; 5c-0499, Asamushi, Aomori-shi, June 14, 1983, coll. Noboru Nunomura; 6didi6\9,Okunai, Aomori-shi, June 19, 1983, coll. Noboru Nunomura; 2ecP299, Minmaya,Minmaya-mura, June 19, 1983, coll. Noboru Nunomura; 4ci" c]39 9, Futatsu--ishi,Isopocis ofAomori Prefecture in Northern Japan 359Imabetsu-machi, June 19, 1983, coll. Noboru Nunomura; 79 9, Moura, Hiranai-machi,June 14, 1983, coll. Noboru Nunomura; 3e8 Kanayazawa, Mutsu-shi, Sep. 30, 1974, coll.Noboru Nunomura; 1 c15 9 9 , Okunai, Aomori-shi, June 19, 1983, coll. Noboru Nunomura.Icr29 9, Amidagawa. Yomogida-mura, July 23, 1984, coll. Noboru Nunomura; 2crc!,Kanita, Kanita-machi, July 23, 1984, coll. Noboru Nunomura; 3dn dn, Nonai, Aomori-shi,July 23, 1984, coll. Noboru Nunomura; 29 9, Arito, Noheji-machi, Sep. 30, coll. NoboruNunomura; 2cP di28 9 9 , Asamushi, Aomori-shi, June 11, 1982, coll. Hiroshi Morino.                              Family Armadillidae                      Armadilldium vulgare (Latreille, 1804)                         (Japanese name: Oka-dangomushi)     Material examined: lcn, Moura, Hiranai-machi, June 14, 1983, coll. NoboruNunomura; 3d"829 9, Okunai, Aomori-shi, June 19, 1983, coll. Noboru Nunomura; lc]Asamushi, Aomori-shi, June 15, 1983, coll. Noboru Nunomura.Material examined            Family Tylidae   Tylos granun:ferus Budde-Lund, 1885    (Japanese name: Hama-dangomushi): 1 ex., Ajigasawa, date unknown, coll. Makoto Tsuchiya.Discussion     A tota1 of 28 species of isopod crustaceans, including 17 marine, 1 freshwater and 10terrestrial species, were recorded from the coastal and terrestrial habitats of AomoriPrefecture, Northern Japan. The biogeographical aspects of isopod fauna of these areasstudied are as follows.     1. The most dominant species in the intertidal marine isopod crustaceans collectedfrom Aomori Prefecture are ldotea ochotensis, Leptosphaeroma gottcshei andGnorimosphareoma rayi, the most dominant subtidal species is 7Vatatolana japonensis.     2. Idotea ochotensis is considered to be colder elements but more typical cold waterelements such as the genus Tecticipes is lacking. Other intertidal species are considered tobe warmer elements.     3. As to the terrestrial species, both northern elements and southern elements arefound. Detonella japonica and Ligidium japonicum are considered to be colder elements.But others are warmer elements and cosmopolitan foreign elements.     4. As to the number of indiyiduals, Porcellio scaber is the most dominant in urban andagricultural areas. Whereas, Ligidium japonicum is the most dominant in natural forests. Theboth species are considered to be Northern elements, though the former is considered to becosmopolitan.360 N. NUNOMURA                            Acknowledgements      I would like to express my sincere gratitude to Dr. Makoto Tsuchiya of the AsamushiMarine Biological Station (present: Ryukyu University) for his kindness in offering manyinteresting specimens and Prof. Kenji Osanai and many staffs at that time for their collectingmaterials. I also express my sincere gratitude to Prof. Yoshiaki Nishikawa and otherscientists for their kindness in giving me opportunities for isopod specimens.                              ReferencesNunomura, N. 1992. Marine Isopoda from Amakusa, Kyushu (II). Publ. Amakusa Mar.     Biol. Lab. 11(2): 59-71.Nunomura, N. 1998. A New species of the gnathiid crustacean from the Sea off Sanriku,     Northern Japan. Bull. Toyama Sci. Mus. 21: 55-60.

Isopod crustaceans collected from Aomori Prefecture Northern Japan

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Isopod crustaceans collected from Aomori Prefecture Northern Japan

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