20 Rissoa parva. Shell height 3.2 mm. Lleyn Peninsula, Wales. March 2015.

20 Rissoa parva. Shell height 3.2 mm. Lleyn Peninsula, Wales. March 2015.

1: mantle dull-yellow (varies).
2: when extended, anterior of sole axe-shaped.
3: heart-shaped anterior pedal mucous-gland discharges within bilaminate anterior-edge of sole which spreads mucus to lubricate creeping.
4: single medial opaque white line in cephalic tentacles; discontinuous on this specimen.

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