Distribution of intertidal molluscan species around Motoshima Island, Shimoyashiki, Tanabe, Wakayama , Japan

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1 Biological Data- Argonauta 9: (20) Distribution of intertidal molluscan species around Motoshima Island, 200 Shun-ichi Ohgaki: 29- Shimoyashiki, Tanabe, Wakayama , Japan Distribution of intertidal molluscs was investigated around Motoshima Island, at the mouth of Tanabe Bay, central Japan (33 44 N, 35 2 E; Fig. ). The survey was undertaken in 200, using the same method as in the previous survey in 2005 (Ohgaki et al. 2007).The entire coast of the island was divided into 45 plots. All the molluscan species encountered were identified and their densities were evaluated in each plot. The field censuses were carried out at the spring low tides during 0 26th, July, 200. One or two researchers investigated one plot, and the time spent for each plot was 6 35 min. Ninety-six species were recorded from the study area. The results are shown in Table. The author thank K. Komemoto and N. Funayama for their help in the field survey. Reference Ohgaki S, Komemoto K, Funayama N (2007) Distribution of intertidal molluscan species around Motoshima Island, Argonauta, 3,

2 Fig.. Study area. Numerals in the right figure are plot codes. Table. List of the molluscan species recorded in the study area. Italic numerals in the first column are species codes and those in the first row are codes of survey plots (Fig. ). The numeral in each cell indicates the maximum density of the species (no./ m 2 ) in each plot:, 9; 2, 0 99; 3, ; 4, )., only one individual was encountered in the plot. 35

3 Japanese name POLYPLACOPHORA Ischnochiton comptus Acanthopleura japonica Acanthopleura loochooana Onithochiton hirasei Acanthochitona achates GASTROPODA Scutellastra flexuosa Cellana grata Cellana nigrolineata Cellana toreuma Patelloida saccharina lanx Patelloida pygmaea herold i Nipponacmea schrenckii Lottia langfordi Lottia kogamogai 2 2 Lottia tenuisculpta Nipponacmea nigrans Haliotis varia Montfortula picta 2 2 Chlorostoma lischkei Chlorostoma xanthostigma Omphalius rusticus Omphalius nigerrimus Trochus maculatus 2 Trochus rota 2 Tectus pyramis Tectus conus Fossarina picta 36

4 No plots

5 Japanese name Monodonta labio confusa Diloma suavis 2 2 Calliostoma unicum Angaria neglecta Astralium haematragum Turbo coronatus coreensis 2 2 Nerita albicilla Cerithium coralium Clypeomorus bifasciata Planaxis sulcatus Batillaria cumingii 4 Peasiella habei Nodilittorina radiata Nodilittorina trochoide s 2 Nodilittorina vidua Littorina brevicula 2 2 Hipponix conica Hipponix trigona Serpulorbis imbricatus Cypraea miliali s Cypraea boivinii Cypraea annulus Cypraea caputserpentis Natica gualterian a Cronia margariticola 2 2 Muricodrupa fusca Morula musiva Morula granulata Morula iostoma 38

6 No. plots

7 Japanese name Mancinella bufo Mancinella siro Thais clavigera Thais luteostoma 2 Thais bronn i Euplica scripta Mitrella bicincta Reticunassa festiva Enzinopsis menkeana Strigatella scutulata Dolabella auricularia Peronia sp. cf. verruculata Siphonaria japonica Siphonaria sirius 2 Siphonaria acmaeoide s BIBALVIA 2 2 Barbatia lima Barbatia virescens Arca boucardi Mytilus coruscus Xenostrobus atratus Mytilus galloprovinciali s 4 Septifer bilocularis Hormomya mutabilis Septifer virgatus Pinctada martensi i Isognomon acutirostris Hyotissa chemnitzi 2 2 Crassostrea nippona 40

8 No. plots

9 Japanese name Saccostrea mordax Saccostrea glomerata Crassostrea gigas Saccostrea kegaki Dendostrea crenulifera Lasaea undulata Cardita lean a Chama japonica 2 Pseudochama retroversa Chama brassica Claudiconcha japonica No. species

10 No. plots