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Arakawa, Kohman Y. Citation PUBLICATIONS of the SETO Title STUDIES ON THE MOLLUSCAN FAECES (II) Author(s) Arakawa, Kohman Y. PUBLICATIONS OF THE SETO MARINE BIOLOGICAL Citation LABORATORY (1965), 13(1): 1-21 Issue Date 1965-06-30 URL http://hdl.handle.net/2433/175396 Right Type Departmental Bulletin Paper Textversion publisher Kyoto University STUDIES ON THE MOLLUSCAN FAECES (II) KORMAN Y. ARAKAwA Hiroshima Fisheries Experimental Station, Kusatsu-minami-cho, Hiroshima, Japan With Plates I-VI and 5 Text-figures The work recorded in this paper is a continuation of the study on the molluscan faecal pellets, which has already been presented partly in a preliminary communication (ARAKAWA, 1962) and an initial paper of this series (ARAKAWA, '63). In this paper are included the descriptions of the pellets of fourty-four more molluscan species which were collected at several locations in the Seto Inland Sea and the vicinities in these four years. Before passing to the descriptions, I wish to express my cordial thanks to the following gentlemen who offered me facilities or help in earring out the present work: Dr. Toshijiro KAWAMURA (Hiroshima University), Dr. Ryozo YAGIU (Hiroshima Univ.) Dr. Takasi ToKIOKA (Seto Marine Biological Labora­ tory), Dr. Yoshimitsu 0GASAWARA (Naikai Regional Fisheries Research Lab.), Dr. Huzio UTINOMI (Seto Mar. Bioi. Lab.), Mr. Nobuo MATSUNAGA (Isumi Senior High School), Dr. Katura OYAMA (Geological Survey), Dr. Iwao T AKI (Hiroshima Univ.), Dr. Kikutaro BABA (Osaka Gakugei Univ.), Dr. Shigeru 0TA (National Pearl Research Lab.), Prof. Jiro SE:No (Tokyo Univ. of Fisheries) and Mr. Masa-aki HAMAr (Hiroshima Fish. Exp. Sta:). MATERIAL The scientific names, localities and types of faeces of respective species treated in this work are listed below. Species Locality** Type of faeces* POLYPLACOPHORA Ischnochitonidae 1. Ischnochiton comptus Shirahama (S) Subovoid GASTROPODA Haliotidae 2. Nordotis discus (C) Columelliform Fissurellidae 3. Montfortula pulchra (S) Quasi-cylindric Patellidae 4. Cellana nigrolineata (,) Spiral Acmaeidae 5. Notoacmea fusconigra (») 6. N. schrenckii Miyajima (») 7. Colli sella heroldi Miyajima (,) Orthocylindric Trochidae 8. Trochus sacellum rota Shirahama (C) Quasi-columelliform Publ. Seto Mar. Bioi. Lab., XIII (1), 1--21, 1965. (Article 1) 2 K. Y. ARAKAWA 9. Calliostoma unicum Shirahama ( ") ?Columelliform Turbinidae 10. Turbo cornutus ?Miyajima (") 11. Lunella coronata coreensis Shirahama ( ") Quasi-columelliform Viviparidae 12. Cipangopaludina malleata Itsukaichi (S) Subovoid Vermetidae 13. Serpulorbis imbricatus Etajima (") Planaxidae 14. Planaxis sulcatus Shirahama ( ") or Spindle Potamididae 15. Cerithidea rhizophorarum Aio (") 16. Batillaria zona/is (") Spindle Cerithiidae 17. Clypeomorus humilis Shirahama ( ") Subovoid or Spindle 18. Australaba picta Ninoshima (") Hipponicidae 19. Sabia conica Shirahama ( ") Subovoid Cypraeidae 20. Ravitrona caputserpentis (?") ?Orthocylindric reticulum Tonnidae 21. Tonna luteostoma Kamae (") ?Subovoid Muricidae 22. Rapana thomasiana Miyajima (C) Vermiform 23. Ocenebra japonica Shikanoshima ( S) Orthocy lindric Columbellidae 24. Euplica scripta Shirahama (?) Haminoeidae 25. Haloa japonica Aio ( S) Orthocy lindric Lymnaeidae 26. Lymnaea japonica Itsukaichi (") Achatinidae 27. Achatina !utica Amami-oshima (C) Diplo-columelliform Bradybaenidae 28. Bradybaena similaris Kusatsu ( S) Orthocylindric Limacidae 29. Limax sp. Hatsukaichi ( ") Subovoid Aplysiidae 30. ?Aplysia kurodai Shirahama ( ") Rozarioid PELECYPODA Arcidae 31. Anadara subcrenata Shirahama (S) Plano-concave 32. Barbatia virescens obtusoides Shikanoshima (") ? Mytilidae 33. Septifer bilocularis pilosus Shirahama (") Bi-crescentic Amusiidae 34. Amusium japonicum Kamae (C) ? Pectinidae 35. Pecten albicans (") Limidae 36. Lima sowerbyi Shirahama (,) ?Columelliform Ostreidae 37. Crassostrea gigas Miyajima (S) ?Bi-cricoid 38. Saxostrea echinata Etajima ( , ) Bi -crescentic Galeommatidae 39. Scintilla japonica Miyajima (,) Segmental Cardiidae 40. Fulvia mutica (,) Rozarioid Veneridae 41. Meretrix lusoria Kamae (C) 42. Dosinia japonica Miyajima (S) Orthocylindric CEPHALOPODA Octopodidae 43. Octopus marginatus Kamae ( S) Orthocy lindric 44. 0. minor variabilis Miyajima (,) , or Vermiform * After the terminology proposed in my previous paper (ARAKAWA, '62). (S) : Simple faeces, (C) : Compound faeces ** Detailed localities are as follows ; Shirahama ---------········--·····--·Wakayama Prefecture, on the west coast of Kii Peninsula. Etajima, Hatsukaichi, } Itsukaichi, Kusatsu, ------Hiroshima Pref., o~ the Inland Sea coast of Honshu Island, Miyajima, Ninoshima, west of the mtddle. Aio ------------------------------------Yamaguchi Pref., on the Inland Sea coast of Honshu Is!., in the western part of the sea. Kamae--------------------------------·Oita Pref., on the north eastern coast of Kyushu Is!. Shikanoshima --------------------·Fukuoka Pref., on the north western coast of Kyushu Is!. {\mami-oshima ------·--··----------Ka~Soshima Pref., on the southern co;1st of Kyushu I?l, Studies on Molluscan Faeces (II) 3 DESCRIPTIONS 1. Ischnochiton (lschnochiton) comptus (GOULD, 1859) Japanese name: Usu-hizara-gai (Pl. I, fig. 1) Faeces are ovoid and shed occasionally united together in a chain. They are composed mostly of undigested fibrous materials which may present a cloth-like appearance partly on the surface. In color, they are grayish white and dotted with purplish black. The size of pellets varies greatly. Measurement;- Size of animal (em) 2.1 in length (Spec. No. 120) Diam. of pellet (mm) 0~4 Q~ QW Length of pellet (mm) 1.42 2.73 2.91 Length/diam. 2.20 3.13 3.00 2. Nordotis discus (REEVE, 1846) Japanese name : Kuro-awabi (Pl. I, figs. 2-3) The pellets in this species are of the same type as those of Haliotis japonica in general appearance. They consist each of constituent faecal filaments loosely packed by mucus into an elongate rod with a rounded section. The rod is covered outside with a jelly-like membrane (or sheath) except for the mid-ventral line where the jelly membrane is cut off longitudinally. The rods are 0.64 mm in diameter including the sheath and the constituent filaments are 0.04 mm in diameter for an examined animal. 3. Montfortula pulchra ADAMS, 1852 Japanese name : Suso-kake-gai (Pl. I, fig. 4) This species sheds faeces in rods with a rounded section. They are coarse in texture, rather soft in consistency and light whitish green in color, and are built of coarse fragmentary materials probably algal in origin. For an animal with a shell 0.9 em Ion~ and 0.() em hi~h, the diam~ter of pelletl? is 0.31 mm. 4 K. Y. ARAKAWA 4. Cellana nigrolineata (REEVE, 1854) Japanese name: Ushi-no-tsume, Matsuba-gai (Pl. I, fig. 5) This species voids rod-shaped pellets marked with a single sinistral spiral groove. They are soft and homogeneous in consistency, light grayish yellow in color, and fairly coarse in texture of the surface. They are com­ posed of fully-digested algal matters and some diatom tests (Skeletonema, Navicula etc.). For an animal with a shell 3.2 em long, the diameter of faeces flactuates in the range 0.55 mm-0.60 mm. 5. Notoacmea fuscoviridis TERAMACHI, 1949 Japanese name: Kusa-iro-ao-gai (Pl. I, fig. 6) Faecal rods of this species are marked with a sinistral spiral groove. They are grayish brown in color, sometimes patched or striped with bands of darker hue. They consist of rather coarse algal fragments. The diameter of the rods shed by an animal with a shell 1.7 em long, is 0.36 mm on an average. 6. Notoacmea schrenckii (LISCHKE, 1868) Japanese name : Ao-gai The faecal rods are cylindrical and marked with a single sinistral spiral groove. They are coarse in texture, rather firm in consistency and usually dirty yellowish green in color. They are composed of rather coarse fragments of green and brown algae. For an examined animal, the diameter of rods is 0.37 mm on an average. 7. Collisella (Conoidacmea) heroldi (DUNKER, 1861) Japanese name : Kogamo-gai The voided rods are cylindrical in shape and with a smooth and unscul­ ptured surface, and bowed slightly and evenly. They are formed almost of algal fragments containing some diatoms (Navicula, Corethron, Achnanthes etc.), with finer material in the axial and ventral part, whereas the coarser material in the peripheral and dorsal parts. They are yellowish brown in color, rather Studies on Molluscan Faeces (II) 5 fine and homogeneous in texture. For an examined animal, the pellet-dia­ meter is 0.20 mm on an average. 8. Trochus sacellum rota DuNKER, 1860 Japanese name: Uzu-ichimonji (Pl. I, figs. 8-10) The faeces are rather complicated in structure. They are rod-shaped and with two deep narrow ventral grooves, so that the cross-section is roughly elliptical, somewhat depressed dorso-ventrally and marked with two notches on the ventral side. The rods are composed of two kinds of materials: the coarse material in the axial part which is derived from the "stomach string" according to the terminology suggested by CARRIKER (1946) and the finer material, in the dorsal and peripheral parts and along the mid-ventral ridge, derived from the "liver string" which is arranged to form obscure and somewhat irregular undulations on the surface. The average diameter of the faeces voided by an animal with a shell 2.5 em in height, is 0.65 mm. 9. Calliostoma ( Tristichotrochus) unicum (DUNKER, 1860) Japanese name: Ebisu-gai (Pl. I, fig. 7) The faecal pellets of this species are somewhat simpler than those of other trochids so far described. They are rod-shaped and without any prominent surface
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