PROC. BIOL. SOC. WASH. 107(3), 1994, pp. 517-523 AMPHITRITE LOBOCEPHALA, A NEW SPECIES (POLYCHAETA: TEREBELLIDAE) FROM TAIWAN Hwey-Lian Hsieh Abstract.— K new terebellid polychaete species is described from a sandflat on the west coast of Taiwan. Amphitrite lobocephala, new species, lives in U-shaped tubes and is gregarious. The new species is similar to Amphitrite edwardsii (Quatrefages). Both species have 1 7 thoracic setigers and three pairs of well developed branchiae. Uncini are present from uncinigerous segments 7-16. The new species differs markedly from A. edwardsii and other species of Amphitrite that have been recorded from Pacific and adjacent waters by the presence of lateral lobes on the peristomium. A key is provided to the species of Amphitrite from the western Pacific, East Indies, Red Sea, Mediterranean and northern Australia. Studies on polychaete communities from the intertidal areas on the west coast of Tai-wan have recently been conducted (Hsieh & Chang 1991). A new terebellid species is one of the dominant tube-dwellers on the sandflats. This species is described herein and compared with related species. The types are deposited in the Institute of Zo-ology, Academia Sinica, Taipei, Taiwan (ASIZIP); the Australian Museum, Sydney, Australia (AM) and the National Museum of Natural History, Smithsonian Institu-tion, Washington, D.C., U.S.A (USNM). Family Terebellidae Genus Amphitrite MuUer Amphitrite lobocephala, new species Figs. 1-5 Material examined. —IrviQTiiddA sandflat at Hsiang Shan (24°50'N, 120°54'E), Hsin Chu Hsien, northwest coast of Taiwan, 22 Aug 1990: holotype (ASIZIP7), complete, female, 144 setigers, 80 mm long, 3.3 mm maximum width. 10 paratypes: 3 females (ASIZIP8, ASIZIP15, ASIZIP17), com-plete, 1 24-1 30 setigers, 73-80 mm long, 2.7-2.8 mm wide; 2 males (ASIZIP9, ASIZIPl 3) complete, 131-166 setigers, 75 mm long. 3.3-3.4 mm wide; 3 males (ASIZIP 10, ASIZIPl 1, ASIZIP12) incomplete, 28-49 setigers, 30-47 mm long, 2.8-3.0 mm wide; 2 sex indeterminable (ASIZIP 14, ASI-ZIPl 6), incomplete, 24-71 setigers, 25^8 mm long, 3.3 mm wide. 27 Nov 1990: 4 paratypes (ASIZIPl 8), complete with tubes, 42-80 mm long, tubes 140-210 mm long. 16 Apr 1991: 2 paratypes (ASIZIP 19), com-plete with tubes, 75-90 mm long, tubes 140-160 mm long. 1 Feb 1993: 2 paratypes (ASIZIP20), juveniles, 38^7 setigers. May 1990: 1 paratype (ASIZIP21), incomplete, about 2.5 mm wide. 29 Sep 1990: 3 para-types (AM W 20887), 1 complete, 150 se-tigers, 23 mm long, 2.5 mm wide; 2 incom-plete, 29-56 setigers, 25 mm long, 1.5-2.5 mm wide. 10 Aug 1991: 4 paratypes (AM W 20888), 90-105 setigers, 27-45 mm long, 2-3.5 mm wide. 1 Feb 1993: 9 paratypes (USNM 168062), complete with tubes, tubes about 120-170 mm long. Description.— ¥o^xnd in U-shaped tubes made of sand grains and shell debris. Tube length about twice that of an individual. One of two tube openings fringed. Live specimens with anterior dorsum pale green, ventral glandular pads red, edge of thoracic uncinigerous podia brownish in color; al-
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