Aspidosiphon (Paraspidosiphon) coyi

Hsueh, Pan-Wen & Kuo, Chia-Ming, 2009, New records of sipunculan worms from Taiwan, Zootaxa 2067, pp. 51-61 : 60

Aspidosiphon (Paraspidosiphon) coyi de Quatrefages

Figs 2 K, 3G–H

Aspidosiphon coyi Cutler, 1994: 221 (for complete synonymy).

Material examined. One specimen (NMNS-5928-022), Sunsheintai (23°06.899' N, 121°24.012' E), Taitung County, eastern Taiwan, intertidal coral reefs, coll. P.-W. Hsueh, 14 October 2007.

Remarks. Aspidosiphon coyi and A. laevis de Quatrefages are the only two species in Aspidosiphon (Paraspidosiphon) , defined by the anal shield possessing extensive grooves or furrows ( Hsueh et al. 2006: 371, fig. 3B; present study, Fig. 3 G). Aspidosiphon coyi differs from A. laevis by the presence of a very small secondary tooth on introvert hooks and its retractor originating at the posterior end (95–100%). The present specimen agrees with most of the above key characters, with the introvert hooks each having a secondary tooth ( Fig. 2 H) and the retractor originating at the posterior end but about 93% of the length of the trunk. This species inhabits intertidal coral rock and has been recorded from several locations in the western Pacific Ocean, from central Japan through Okinawa, Philippines, Indonesia to the Kermadec Islands ( Cutler 1994).

Figures

FIGURE 2. A, Sipunculus robustus Keferstein. B, Siphonosoma funafuti (Shipley). C, Siphonosoma vastum (Selenka and Bülow). D, Golfingia margaritacea margaritacea (Sars). E, Golfingia muricaudata (Southern, 1913). F, Thysanocardia nigra (Ikeda). Scalebars: A-E, 10 mm; F, 2.5 mm. G, Themiste minor minor (Ikeda), H, Phascolosoma arcuatum (Gray). I, Phascolosoma glabrum glabrum (Sluiter). J, Aspidosiphon (Aspidosiphon) muelleri Diesing. K, Aspidosiphon coyi de Quatrefages. Scalebars: G, 5 mm; H – J, 10 mm; K, 2.5 mm.

FIGURE 3. A, Introvert hooks of Siphonosoma vastum (Selenka and Bülow). B, Anterior close-up view of Themiste minor minor (Ikeda), showing posteriorly orientated hooks. C, Introvert hooks of Phascolosoma arcuatum (Gray). D, Introvert hooks of Phascolosoma glabrum glabrum (Sluiter). E, Anal shield of Aspidosiphon muelleri Diesing. F, Introvert unidentate hook of Aspidosiphon muelleri Diesing. G, Anal shield of Aspidosiphon coyi de Quatrefages, showing grooves on the surface of anal shield. H, Introvert hook of Aspidosiphon coyi de Quatrefages, showing a small secondary tooth on the hook. Scalebars: A, 100 μm; B, E, G, 1 mm; C – D, 80 μm; F, 10 μm; H, 20 μm.