Coll. and Res. (2005) 18: 7-9 7

New Records of Marine Gastropods from Taiwan Yu-Ting Cheng, Teng-Yang Yeh, Chun-Yi Chang, and Pan-Wen Hsueh*

Department of Life Sciences, National Chung Hsing University, Taichung, Taiwan 402, R.O.C.

(Received April 11, 2005; Accepted July 23, 2005)

Abstract. Three species of gastropods, belonging to three families, are reported for the first time from Taiwan. They are Broderipia iridesens (Family Trochidae), orientalis (Family Onchididae), and Siphonaria (Planesiphon) acmaeoides (Family Siphonariidae). Morphological and ecological information of these species are also discussed.

Key words: Broderipia iridesens, new records, Onchidella orientalis, Siphonaria (Planesiphon) acmaeoides, Taiwan.

INTRODUCTION Family Trochidae Broderipia iridesens Broderip, 1834 Surveys on the molluscan fauna of Taiwan (Fig. 1a-c) were periodically conducted in the past few decades. A comprehensive checklist for the class Broderipia iridesens Broderip, 1834 (not seen); was recently assembled (Wu, 2003a, Sasaki, 2000: 69-70. b, c). However, several unrecorded species of Materials examined: 1 specimen (SL 7.4, SW 4.9, marine gastropods were collected during a recent SH 1.4) (NMNS 004917-01), Route 2 at 117 km ecological study in intertidal zone on the northern mark (24 59'N, 121 56'E), Ilan County, north- coasts of Taiwan. Among these species, three eastern Taiwan, upper intertidal, surfaces of gastropods, namely Broderipia iridesens eugeosyn rock walls, Nov. 24, 2003, coll. P.-W. (Broderip, 1834), Onchidella orientalis (Taki, Hsueh; 3 specimens (SL SW SH: 6.4 4.2 1935), Siphonaria (Planesiphon) acmaeoides 1.7, 5.1 3.8 1.2, and 5.4 4.1 1.4) (NMNS Pilsbry, 1894, have known distribution ranges 004917-02), Route 2 at 117 km mark, Ilan County, limited to Japan (Kurozumi, 2000; Sasaki, 2000). northeastern Taiwan, upper intertidal, surfaces of The present study adds a new geographic locality eugeosyn rocks, Mar. 4, 2004, coll. P.-W. Hsueh. to their original reported distribution ranges. Specimens of the present study are deposited in Remarks: This small patelliform trochid has a the National Museum of Natural Science, distinctively reticulate color pattern on the dorsal Taichung, Taiwan. shell surface and an iridescent interior shell surface. Its known distribution range is from Kii METHODS Peninsula (Japan) to the Indo-Pacific (Sasaki, 2000). Interestingly, this species appears to favor Specimens were collected by hand during vacant sea urchin pits on eugeosyn rocks. sampling carried out from August 2003 to March 2004 at Fugueigiau, Linshenbee, Route 2 at the Family 117 km mark and Shimen sites on the northern Onchidella orientalis Taki, 1935 coasts of Taiwan. All measurements are in (Fig. 1d) millimeter (mm). Abbreviations: SL, shell length; SW, shell width; SH, shell height; BL, body Onchidella orientalis Taki, 1935 (not seen); length; and BW, body width. Kurozumi, 2000: 812-813.

*Corresponding author. E-mail: [email protected]. Materials examined: 7 specimens (BL range edu.tw 2.0~7.7, BW range 1.3~3.3) (NMNS 004918-01), 8 Coll. and Res. (2005) 18: 7-9

Fugueigiau (25 18'N, 121 31'E), Taipei County, species is limited to two geographic areas (Seto northwestern Taiwan, lower intertidal, in crevices inland Sea and Ariake Bay, Japan), whereas the of dead coral reef, Nov. 19, 2003, coll. P.-W. latter species has a relatively wider distribution Hsueh; 14 specimens (BL range 5.0~9.4, BW range, from Boso Peninsula to Amami Islands range 3.7~4.1) (NMNS 004918-02), Fugueigiau, (immediately north to Okinawa Islands), Japan Taipei County, northwestern Taiwan, lower (about 28 35'N) (Kurozumi, 2000). Onchidella intertidal, in crevices of dead coral reef, Mar. 12, orientalis is quite abundant in dead coral reefs 2004, Coll. P.-W. Hsueh; 16 specimens (SL range scattered on the northern coasts of Taiwan. 3.1~7.8, SW range 2.0~4.1) (NMNS 004918-03), Linshenbee (25 17'N, 121 30'E), Taipei County, Family Siphonariidae northwestern Taiwan, lower intertidal, in crevices of dead coral reef, Mar. 11, 2004, coll. P.-W. Siphonaria (Planesiphon) acmaeoides Pilsbry, Hsueh; 9 specimens (BL range 4.8~14.0, SW 1894 range 3.0~6.6) (NMNS 004918-04), Shimen (Fig. 1e-g) (25 17'N, 121 34'E), Taipei County, northwestern Siphonaria (Planesiphon) acmaeoides Pilsbry, Taiwan, lower intertidal, in crevices of dead coral 1894 (not seen); Kurozumi, 2000b: 814-815. reef, Mar. 14, 2004, Coll. P.-W. Hsueh; 16 Material examined: 1 specimen (SL 17.2 mm, SW specimens (BL range 4.3~18.5, BW range 14.2 mm, SH 5.8 mm) (NMNS 004919), Shimen 3.2~9.3) (NMNS 004918-05), Shimen (25 17'N, (25 17'N, 121 34'E), Taipei County, northwestern 121 34'E), Taipei County, northwestern Taiwan, Taiwan, upper intertidal, surface of neogene lower intertidal, in crevices of dead coral reef, volcanic rock, Mar. 14, 2004, coll. P.-W. Hsueh. Mar. 16, 2004, coll. P.-W. Hsueh. Remarks: This siphonarid has a relatively confined Remarks: This species is very similar to its distribution in Japan, from the Boso Peninsula to congener, Onchidella kurodai (Taki, 1935), but it Kyushu (about 30 ~35 N) (Kurozumi, 2000). The can be separated by the color of the dorsal body discovery of this species in northern Taiwan surface, the body and crop sizes, and the extends its southerly distribution to about 25 N. In distribution range. The dorsal surface color of O. comparison to the sympatric congener, Siphonaria kurodai is blackish green, whereas that of O. (Sacculosiphonaria) japonica (Donovan, 1824), orientalis is blackish brown. Onchidella kurodai collected in the present study, S. acmaeoides was has a larger body and crop compared to O. relatively rare in number. orientalis. The distribution range of the former

(a) (b) (c) (d)

(e) (f) (g)

Fig. 1. (a)-(c) Broderipia iridesens (Broderip, 1834) (SL SW SH: 6.4 4.2 1.7 mm); (d) Onchidella orientalis (Taki, 1935) (SL SW: 4.4 3.3 mm); (e)-(g) Siphonaria (Planesiphon) acmaeoides Pilsbry, 1894 (SL SW SH: 17.2 14.2 5.8 mm). Cheng et al.: New Records of Marine Gastropods 9

ACKNOWLEDGEMENTS Sasaki, T. 2000. Family Trochidae. In T. Okutani, ed., Marine mollusks in Japan. Tokai We thank Mr. Chin-Ling Chen and Shou-Yu University Press, Tokyo. pp. 69-70. Chen for their assistance with field collections and Wu, W. L. 2003a. The Taiwan malacofauna. I. laboratory sorting. This study was supported by a Gastropoda-Archaeogastropoda. Council of grant (NSC92-2621-005-002) from the National Agriculture, Taipei, Taiwan. (in Chinese). Science Council of the R.O.C. to P. W. Hsueh. Wu, W. L. 2003b. The Taiwan malacofauna. II. Gastropoda-Mesogastropoda. Council of REFERENCES Agriculture, Taipei, Taiwan. (in Chinese). Wu, W. L. 2003c. The Taiwan malacofauna. III. Kurozumi, T. 2000. Subclass . In T. Gastropoda-Neogastropoda. Council of Okutani, ed., Marine mollusks in Japan. Tokai Agriculture, Taipei, Taiwan. (in Chinese). University Press, Tokyo. pp. 811-815.

Broderipia iridesens (Family Trochidae) ( ), Onchidella orientalis (Family Onchididae) ( ), and Siphonaria (Planesiphon) acmaeoides (Family Siphonariidae) ( )