1: blackish viscera.
2: jaw; internal black sclerotized plate grips substrate during feeding strokes of radula.
3: oral lappets touching substrate, concealing foot.
4: oral lappets drawn back revealing anterior of foot.
5: rudimentary cephalic tentacles consist of mound bearing large black eye.
6: mantle rim.
Profile photographs were taken by positioning Otina in water on a vertical surface with camera facing down. Multiple face-on images, as above, obtained because, when positioned for a lateral view, its negative geotaxy caused it to promptly turn to move upwards before photographer could dry hand and release the shutter.
Shell length 2 mm. North Yorkshire, September 2014. (leg. Jan Light.)

02 Otina ovata