Undulacandona, Smith, 2011

KEY TO SPECIES OF UNDULACANDONA

1. Dorsal margin of the LV arched, shell subtriangular in lateral view..... Undulacandona cetus sp. nov

– Dorsal margin of both valves flat, shell subrectangular in lateral view..................... 2

2. Anterior seta on UR by far exceeding half L of the anterior claw...... Undulacandona andromeda sp. nov.

– Anterior seta on the UR at the most reaching 1/3 L of the anterior claw........................ 3

3. A prominent spine present on both prehensile palps.................................. 4

– Spine on prehensile palps absent............. 5

4. Lobe a on the hemipenis much higher than lobe h..................................... U. koreana sp. nov.

– Lobe a on the hemipenis shorter or equal in size to lobe h...................... U. aeolus sp. nov.

5. Lobe a on the hemipenis narrow..................................... U. spinula Smith, 2011

– Lobe a broad, tapering towards distal end..... U. colymba Smith & Kamiya, 2015 .