Baba, Kikutaro

Publications of the Seto Marine Biological Laboratory

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Title THE GENERA GYMNODORIS AND NEMBROTHA FROMJAPAN (NUDIBRANCHIA-POLYCERIDAE)Author(s)Baba, KikutaroCitationPUBLICATIONS OF THE SETO MARINE BIOLOGICALLABORATORY (1960), 8(1): 71-74Issue Date1960-05-30URL http://hdl.handle.net/2433/174700RightType Departmental Bulletin PaperTextversionpublisherKyoto UniversityTHE GENERA GYMNODORIS AND NEMBROTHA FROM JAPAN (NUDIBRANCIDA-POL YCERIDAEYJ KIKUTARO BABA Biological Laboratory, Osaka Gakugei University With Plate V The two genera (Gymnodoris and Nembrotha) have recently been discussed by MACNAE (1959 ?, pp. 354-355). The hitherto recorded members of them from our territory and the adjacent waters are as below : 1. Gymnodoris bicolor (ALDER & HANCOCK, 1864) =G. citrina (BERGH, 1877); G. japonica (BABA, 1930); ? G. maculata STIMPSON, 18552 J Kinuhada·modoki Loc. : Sagami Bay ; Toba and Sugashima ; Kii ; Osaka Bay; Inland Sea of Seto ; Amakusa ; Asamushi; Sado I. ; Toyama Bay ; Togi Kazanashi, W. coast of Noto Peninsula; Tsuruga B:J.y;? Takarajima I. (Tokara group of S. Kyushu). Dist.: E. Africa and Indian Ocean; N. Caledonia; Palau Is. 2. Gymnodoris alba (BERGH, 1877) Akaboshi-umiushi Loc. : Tateyama Bay ; Sagami Bay; Sugashima near Toba ; Kii. Di st. : Indian Ocean ; Philippines. 3. Gymnodoris inornata (BERGH, 1880) Kinuhada-umiushi Loc. : Tateyama Bay ; Sagami Bay ; Kii ; Osaka Bay ; Amakusa ; Nagasaki. Dist.: E. Africa and ? E. Indies. 4. Gymnodoris striata (ELioT, 1908) Kinsen-umiushi Loc. : Inbnd Sea of Seto; Amakusa; Toyama Bay.3 J 5. Gymnodoris okinawae BABA, 1936 Okinawa-kinuhada-umiushi (n.n.) Loc. : Okinawa (Riukiu) Is. (Ishigaki-jima). 6. Gymnodoris subflava BABA, 1949 Usuginu-umiushi Loc. : Sagami Bay ; Kii ; Inland Sea of Seto. 1) Contributions from the Seto Marine Biological Laboratory, No. 347. 2) Originally known from Okinawa (Riukiu), but not fully described. See MACNAE, 1959?, p. 354. 3) Our specimens from Japan appear to constitute a light colour variety of the typical striata, which occurs in the Suez Canal, Red Sea and New Caledonia. See BABA, 1937, pp. 216-218, figs. 1-2. Publ. Seto Mar. Bioi. Lab., VIII (1), 1960. (Article 7l 72 K. BABA 7. Nembrotha gracilis BERGH, 1877 Ryugu-umiushi Loc. : Sagami Bay; Kii. Dist.: Philippines. 8. Nembrotha luteolineata BABA, 1936 Ishigaki-ryugu-umiushi (n.n.) Loc. : Okinawa (Riukiu) Is. ( Ishigaki-jima). 9. Nembrotha saga,miana BABA, 1955 Sagami-ryugu-umiushi Loc. : Sagami Bay. This paper contains the following three species new to Japan. Gymnodoris nigricolor BABA, n. sp. Sumizome-kinuhada-umiushi (n.n.) (Pl. V, Figs. 1A-1B) Very distinct in colouring and in the shape of the radula teeth. Length 4 mm. Body smooth. Gills small, consisting of 9 plumes arranged in a semicircle open behind. Back and sole uniformly bluish black; rhinophores and gills also bluish black. Radula formula 22 x 7-8.1.0.1.7-8. First lateral broad and tricuspidate (the median cusp sharp, the lateral cusps blunt). Next laterals pyriform. Loc.: Misaki, Sagami Bay, on 2m bottom mud (Nov. 1956, 1 sp., coli. by the Biological Laboratory, Imperial Household). The black colouring of this species is somewhat unusual in the genus Gymnodoris. Gymnodoris subornata BABA, n. sp. Hime-kinuhada-umiushi (n.n.) (Pl. V, Figs. 2A-2C) Especially marked by having a small, more or less rudimentary radula. Colouring somewhat as in G. inornata (BERGH, 1880). Body always small, 6-10 mm long ; smooth, or sometimes with minute conical tubercles on the pallial margin; gills small, formed of 3-8 plumes set in a semicircle; whole body surface deep orange-red, rhinophores and gills also orange-red. Radula always small, the representative formula being 16 x 6.1.0.1.6. (Seto specimen). First lateral very small, or missing altogether. Next laterals roughly hamate, each with a straight hook. Loc.: Seto, Kii (May 1954, 1 sp., coli. by Mr. YAMAMOTO). Murotozaki, Shiko-ku (Apr. 1958, 1 sp.). Ogi, Toyama Bay (July 1953, 1 sp., coli. by Mr. ABE). Matsugazaki, Tsuruga Bay (July 1955, 2 sps., coli. by Mr. ABE). On shores. -72-The Genera Gymnodoris and Nembrotha from japan 73 Nembrotha limaciformis ELIOT, 1908 Nishiki-ryugu-umiushi (n. n.) (Pl. V, Figs. 3A-3D) Nembrotha limacijormis ELIOT, 1908, pp. 98-99.-Red Sea. The animal in bright colouring is like a species of Gymnodoris, but it has the radula type of Nembrotha. Length 18-20 mm. Body smooth. Gills 3-5, bipinnate. Oral tentacles lobiform. General colour a deep saffron-red, the back and sides flecked with yellowish white or entirely plain; rhinophores saffron-red, sometimes having a subapical purple spot; gills yellowish white tipped always with purple. Sole uniformly saffron-red. No labial armatures. Radula formulae in three speci-mens collected : 8 x 5.1.1.1.5, 8 x 5-6.1.1.1.5-6, and 12 x 6.1.1.1.6. Central tooth sub-quadrate, without hooks ; first lateral large, simply hamate ; outer laterals scale-like. Loc.: Seto, Kii, on shore (June 1951 and May 1954, 3 sps., coli. by Mr. YAMAMOTO). The purple spots on the rhinophores and on the gills are distinctive in this species, but they are not described in the closely allied form, N. divae MARcus, 1956, from Brazil. Acknowledgements: I am greatly indebted to the following gentlemen by whom many of the specimens have been offered me for examination: Dr. Hirotaro HATTORI (Biological Laboratory of the Imperial Household); Mr. Torao YAMA-MOTO (Seto Marine Biological Laboratory of the Kyoto University); Mr. Takeo ABE (Takaoka Senior High School of Toyama Pref.). REFERENCES ALDER, J. & HANCOCK, A. 1864. Notice of a collection of nudibranchiate Mollusca made in India by Walter ELLIOT, Esq., with descriptions of several new genera and species. Trans. Linn. Soc. London, vol. 5. BABA, K. 1930. Studi<>s on Japanese nudibranchs. 2. Venus, vol. 2, no. 2. (in Japanese) 1936. Opisthobranchia of the Ryilkyil (Okinawa) Islands. Journ. Dept. Agric. Kyushu Imp. Univ., vol. 5, no. 1. ---- 1937. Record of a nudibranch, Gymnodoris striata (ELIOT), from Amakusa, Japan. Dobutsugaku Zasshi (Zoo!. Mag.), vol. 49, no. 6. (in Japanese) 1949. Opisthobranchia of Sagami Bay. Iwanami Shoten, Tokyo. 1955. Opisthobranchia of Sagami Bay, Supplement. Ditto. BERGH, R. 1877. Malacologische Untersuchungen, Hft. 11. ---- 1880. Beitrage zur Kenntniss der japanischen Nudibranchien, I. Verb. k. k. zool.-bot. Gesell. Wien, Bd. 30. ELIOT, C. 1908. Reports on the marine Biology of the Sudanese Red Sea. 11. Notes on a col-lection of nudibranchs from the Red Sea. Journ. Linn. Soc. London, Zoo!., vol. 31. MACNAE, W. 1959?. The families Polyceridae and Goniodorididae (Mollusca, Nudibranchiata) in Southern Africa. Trans. Roy. Soc. S. Africa, vol. 35, pt. 4. MARCUS, E. 1956. Notes on Opisthobranchia. Bol. Inst. Oceanogr., tom. 7, fasc. 1-2. STIMPSON, W. 1855. Descriptions of some of the new marine Invertebrata from the Chinese and Japanese seas. Proc. Acad. Nat. Sci. Philad., vol. 7. -73-74 K. BABA EXPLANATION OF PLATE V Figs. lA-lB. Gymnodoris nigricolor. lA. Animal from Misaki, Sagami Bay (Nov. 27, 1956, length 4 mm, original fig. taken by the Biological Laboratory, Imperial Household) ; lB. A half-row of radula ( x 260), a. 1st lateral, b. outermost laterals. Figs. 2A-2C. Gymnodoris subornata. 2A. Animal from Seto, Kii (May 7, 1954, length 6 mm) ; 2B. A half-row of radula in the same specimen ( x 350), a. 1st lateral, b. outermost laterals; 2C. A half-row of radula in the specimen from Toyama Bay ( x250), letters as before. Figs. 3A-3D. Nembrotha limaciformis. 3A. Animal from Seto, Kii (June 22, 1951, length 18 mm), body saffron-red with yellowish white mar-kings; 3B. A half-row of radula in the same specimen ( x 95), a. central tooth, b. 1st lateral, c. outer laterals ; 3C. Animal from Seto (May 6, 1954, length 20 mm), body uniformly saffron-red without markings; 3D. Radula teeth in the same specimen ( x 60 ), a. central tooth, b. 1st lateral. --74-Publ. Seto Mar. Biol. Lab., VIII, 1 (1960) PLATE V ,r.:/ i 'i \ 2A K. BABA: THE GENERA GYMNODORIS AND NEMBROTHA FROM ]APAN. 

THE GENERA GYMNODORIS AND NEMBROTHA FROM JAPAN (NUDIBRANCHIA-POLYCERIDAE)

Kikutaro Baba

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THE GENERA GYMNODORIS AND NEMBROTHA FROM JAPAN (NUDIBRANCHIA-POLYCERIDAE)

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