13 Rissoella diaphana. Shell height 1.95mm, Weymouth, England, April 2012.
Bilaminate structure of foot clearly distinguished on melanistic specimens as ventral sole-layer is white and dorsal layer black. Two layers do not precisely coincide; to anterior of snout (1) the dorsal layer, like the snout, is deeply and widely bifid exposing large 'V' of white sole-layer (2) .
At anterior, lobe-tip of black upper-layer may be well behind sole edge (3), close to it (4), or extend beyond it ( 14Rd flic.kr/p/Hyrx4f ).
Full SPECIES DESCRIPTION: flic.kr/p/HyryEG
Sets of OTHER SPECIES:
13 Rissoella diaphana. Shell height 1.95mm, Weymouth, England, April 2012.
Bilaminate structure of foot clearly distinguished on melanistic specimens as ventral sole-layer is white and dorsal layer black. Two layers do not precisely coincide; to anterior of snout (1) the dorsal layer, like the snout, is deeply and widely bifid exposing large 'V' of white sole-layer (2) .
At anterior, lobe-tip of black upper-layer may be well behind sole edge (3), close to it (4), or extend beyond it ( 14Rd flic.kr/p/Hyrx4f ).
Full SPECIES DESCRIPTION: flic.kr/p/HyryEG
Sets of OTHER SPECIES: