Aspidosiphon (Aspidosiphon) muelleri Diesing

Figs 2 J, 3E–F

Aspidosiphon muelleri Cutler, 1994: 218 (for complete synonymy).

Material examined. One specimen (NMNS-5928-021), Shiaoliuchiu (22°20.56' N, 120°21.53' E), Pingtung County, southern Taiwan, lower intertidal sandy bottom, coll. P.-W. Hsueh, 5 May 2007.

Remarks. The present specimen possesses a continuous layer of longitudinal muscles, the anal shield has an extensive array of furrows (Fig. 3 E), and its other characters agree with the description by Cutler (1994). A unidentate hook (Fig. 3 F) was observed in the present specimen. However, this character is not reliable for identification as it can also be bidentate or both (Cutler 1994). The species is known as the most widespread Aspidosiphon, commonly found in northeastern Atlantic and occasionally reported from the western Pacific (Japan to Australia) (Cutler 1994). The collection of this species in Taiwan is therefore not surprising.