First record of Holothuria ( Theelothuria ) notabilis (Holothuroidea: Aspidochirotida) from the Beibu Gulf: northward range expansion in the South China Sea

The sea cucumber Holothuria (Theelothuria) notabilis for the first time is reported from the Beibu Gulf, South China Sea. A morphological description of this new record with colour figures and scanning electron microcopy images of its ossicles are provided. This finding widens the geographical range of H. (T.) notabilis and indicates that this species may expand northwards in the South China Sea. With our new record, the subgenus theelothuria is now represented by three species in China.