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国立科博専報,(44),2006年3月28日 Mem. Natn. Sci. Mus., Tokyo, (44), March 28, 2006 A Small Collection of Rissoid Gastropods (Mollusca: Gastropoda: Rissoidae) Collected from Puerto Galera, Mindoro Island, the Philippines Kazunori Hasegawa Tsukuba Research Center, National Science Museum, Tokyo, 4–1–1 Amakubo, Tsukuba-shi, Ibaraki, 305–0005 Japan E-mail: [email protected] Abstract. Rissoid gastropods collected from Puerto Galera, Mindoro Island, Republic of the Philippines, in the intertidal and upper sublittoral zones to a depth of 20 m, are examined taxonom- ically. They are classified into 24 species in seven genera, including three possible undescribed species. Synonymy and taxonomical problems concerning each species are briefly discussed, based mainly on recent data, and some of the specimens are illustrated for subsequent, more detailed studies on this group. Nomenclatural changes are made as follows: Rissoina honoluluensis Watson, 1886 is regarded as a junior synonym of Rissoa rosea Deshayes, 1863; Rissoina tenuistriata Pease, 1868 is regarded as a junior synonym of Rissoina modesta Gould, 1861. Key words : Rissoidae, Philippines, micro-gastropod, new synonym. vey, special attention was paid to microgastropod Introduction assemblages associated with algae, rocks, or The Rissooidea is one of the largest and most dead coral, which resulted in the harvest of con- diverse groups in the Recent “prosobranch” Gas- siderable numbers of specimens in various tropoda (Boss, 1971), and the Rissoidae are its groups. In the present paper, the rissoid speci- largest family-group. Because most of the mens are reported in some detail, in accordance species belonging to the family are small in size, with recent studies based mainly on Japanese and possess convergently simple and variable specimens. shells, their taxonomy and systematics have not been well settled to date, especially in the Indo- Materials and Methods West Pacific region (Ponder, 1985). From Philip- pine waters, Faustino (1928) listed 53 species of All the material examined was collected by the Rissoidae recorded thereto in literature, but no present author around Puerto Galera, Mindoro Is- comprehensive lists of this group have been pub- land (Fig. 1), mainly with the aid of SCUBA, in lished since then, in spite of the recent rapid collaboration with the Marine Science Institute progress in gastropod taxonomy. of the University of the Philippines. The field In 2005, I had an opportunity to participate in survey was carried out from 15–19 March 2005, a brief field survey for the purpose of taxonomi- with the permission of the Department of Agri- cal studies of the intertidal and shallow water in- culture, the Republic of the Philippines, and the vertebrates around Puerto Galera, Mindoro Is- City of Puerto Galera. land, Republic of the Philippines, under the pro- In order to collect microgastropods, dead coral gram “Natural History Researches of the Island and rocks were brushed thoroughly in large plas- Arcs in the Western Pacific” funded by the Na- tic bags under water, and detached residues con- tional Science Museum, Tokyo. During the sur- taining small animals were collected. Algae and 106 Kazunori Hasegawa Fig. 1. Map showing the surveyed area around Puerto Galera, the Philippines. sea grasses were also collected in plastic bags Small La Laguna, west of Sabang, intertidal, and washed thoroughly in tap water to shake off rock-washing, 17 March 2005. PI05-08: Haligue the attached animals. Sediments and algae-wash- Beach, Boquete, 13°31.191ЈN, 120°51.637ЈE, ing residues were then fixed in 10% buffered sea- 1–2 m (A) or 7–8 m (D) depths, coral reef, rock- water formalin for six months, washed thorough- washing, 17 March 2005. PI05-09: Escarceo, ly in tap water, and transferred to 75% ethanol. Sinandigan, 13°31.359ЈN, 120°59.384ЈE, 2–20 m Animals, including gastropods, were sorted out depth, algae and rock-washing, 17 March 2005. from the samples under the microscope in the PI05-10: Manila Channel, Boquete side, laboratory; specimens with soft parts were kept 13°31.192ЈN, 120°51.010ЈE, intertidal, algae- in ethanol and empty shells were dried for washing (mostly Sargassum spp.), 18 March preservation. Specimens examined are to be de- 2005. PI05-11: Fishermen’s Cove, 13°30.551ЈN, posited in the National Science Museum, Tokyo 120°56.412ЈE, 3–5 m depth, rock-washing, 18 and in the National Museum of the Philippines. March 2005. PI05-12: Minolo Bay, 13°30.694ЈN, Abbreviations used in the text are as follows: 120°55.146ЈE, 15–20 m depth, algae (partly dd, empty shell(s); SH, shell height. rock)-washing, 18 March 2005. PI05-13: Coral Garden, San Antonio Is., 13°31.766ЈN, List of stations 120°56.959ЈE, 5–8 m depth, rock-washing, 19 PI05-01: Manila Channel, San Antonio Is., March 2005. PI05-14: Batangas Channel, 13°31.05ЈN, 120°56.90ЈE, 15 m depth, on gravel Dalaruan side, 13°31.391ЈN, 120°57.631ЈE, 3–8 bottom, algae-washing, 15 March 2005. PI05-03: m depth, rock-washing, 19 March 2005. “Coral Garden”, San Antonio Is., 13°31.658ЈN, 120°56.840ЈE, 9 m depth, coral reef, rock-wash- Taxonomy ing, 15 March 2005. PI05-04: near “Ernie’s Family Rissoidae Gray, 1847 Cave”, Sinandigan, 13°31.382ЈN, 120°58.865ЈE, 5–9 m depth, coral reef, rock-washing, 16 March Pusillina (Haurakia) marmorata (Hedley, 1907) 2005. PI05-05: South of Dalaruan, Muelle Bay, [Japanese name: Dairiseki-tsubo] 13°30.814ЈN, 120°57.558ЈE, 2–5 m depth, algae Cithna marmorata Hedley, 1907: 498, pl. 18, figs 27, 28. and rock-washing, 16 March 2005. PI05-07: Vitricithna marmorata: Laseron, 1956: 452, figs 177, 178; Rissoidae of Puerto Galera, the Philippines 107 Kay, 1979: 79, figs 26A, 27E–F. axial ribs on the shell. Pusillina (Haurakia) marmorata: Ponder, 1985: 29–30, fig. 82A–E; Hasegawa, 2000: 149, pl. 74, fig. Ris- soidae-1. Alvania sp. 1 (Fig. 3) Material examined. PI05-01 (3); PI05-04 Alvania (Haurakia) sp. cf. isolata: Ekawa, 1993: 77, pl. 1, (1dd); PI05-05: (3); PI05-08D (2ϩ2dd); PI05-09 fig. 4. [Not Haurakia isolata Laseron, 1956] (5); PI05-11 (2ϩ3dd); PI05-12 (1dd); PI05-13 Onoba isolata: Chang & Wu, 2004: 12, fig. 8. [Not Hau- (25ϩ1dd); PI05-14 (1dd). rakia isolata Laseron, 1956] Remarks. Although this species has not often been cited in literature, it is widely distrib- Material examined. PI05-03 (2dd); PI05- uted in the Indo-West Pacific from its type locali- 08D (2); PI05-13 (3dd). ty in Queensland, Australia, east to Hawaii (Kay, Remarks. This species closely resembles, 1979), and north to Japan (Hasegawa, 2000). Kay and has sometimes been referred to, the preced- (1979) noted that the species is common at ing species, but can be distinguished by its much depths of 3–40 m and may form the dominant weaker and indistinct axial ribs and a characteris- component of micromolluscan assemblages at tic reddish brown spot at the apical part of the these depths in Hawaii. It is also common in the protoconch. Chang and Wu (2004) illustrated this Nansei Islands, Japan, and northern parts of Su- species as “Onoba isolata Kay, 1979”, but the lawesi, Indonesia (Hasegawa, personal observa- authorship of this nominal species must be attrib- tions), but was not found in a similar survey car- uted to Laseron (1956), and the species is cor- ried out in Hainan Island, southern China rectly cited as “Onoba isolata (Laseron, 1956) (Hasegawa et al., 2001). It is not recorded in Tai- fide Kay, 1979 [not Haurakia isolata Laseron, wan either (Chang & Wu, 2004), suggesting a 1956]”. No available name is thus applicable to possible oceanic distribution. this species. Alvania isolata (Laseron, 1956) Alvania sp. 2 (Fig. 2) (Fig. 4) Haurakia isolata Laseron, 1956: 439, fig. 144; Maes, Alvania sp. cf. firma: Ekawa, 1993: 77, pl. 1, fig. 10. [Not 1967: 109, pl. 5, fig. E. Haurakia firma Laseron, 1956] Alvania (Alvania) isolata: Ponder, 1985: 40–41, fig. 93A, B. Material examined. PI05-01 (1); PI05-03 Alvania isolata: Chang & Wu, 2004: 10–11, fig. 5. (1ϩ1dd); PI05-05 (3ϩ1dd); PI05-09 (1); PI05- ?Alvinia isolata: Kay, 1979: 77, fig. 27C. 11 (2ϩ3dd); PI05-12 (1dd); PI05-13 (1ϩ2dd). Remarks. This species closely resembles Al- Material examined. PI05-07 (2dd). vania ogasawarana (Pilsbry, 1904), but can be Remarks. This species was originally de- distinguished from the latter by its thicker spiral scribed from Christmas Island, Indian Ocean, and ribs that are granulate at the intersection with the has subsequently been recorded from Cocos- axial ribs, and the more pointed apex with a Keeling Island, Indian Ocean (Maes, 1967), Tai- smaller protoconch. Among previously known wan (Chang & Wu, 2004), and the Philippines taxa, Haurakia firma Laseron, 1956, described (present study). It is thus probable that this from Keppel Bay, northeastern Australia, may be species is widely distributed in the Indo-West Pa- most closely allied, as previously suggested by cific, although the specimen illustrated by Kay Ekawa (1993), but that species has a white and (1979) from Hawaii under this name looks slight- translucent shell. ly different, with thicker and more widely spaced 108 Kazunori Hasegawa Figs 2–10. Species of Rissoidae. 2, Alvania isolata (Laseron, 1956), PI05-07; 3, Alvania sp. 1, PI05-13; 4, Alva- nia sp. 2, PI05-11; 5, Parashiela ambulata Laseron, 1956, PI05-08D (A), PI05-04 (B); 6, Parashiela invisi- bilis (Hedley, 1899), PI05-08D; 7, Lucidestea vitrea Laseron, 1956, PI05-08D (A), PI05-04 (B); 8, Rissoina (Rissoina) rosea (Deshayes, 1863), PI05-08D (A), PI05-01 (B, C); 9, Rissoina (Rissoina) modesta Gould, 1861, PI05-08D; 10, Rissoina (Rissoina) evanida G. & H. Nevill, 1874, PI05-05 (A), PI05-03 (B). Scales: 1 mm for 2–4, 5 and 6, and 7, respectively; 2 mm for 8–10.