<p><em>Jorunna tomentosa</em> (Cuvier, 1804)</p>
On lower shore and sublittoral fringe. Well camouflaged on prey; Halichondria panicea (EML) and Haliclona spp. ( EML & EML) Simultaneous hermaphrodite. Spawn, February – August in Britain, a spiral ribbon attached by its edge in a tight coil to substrate or food (EML). Planktonic veliger larvae for about three weeks before transforming into adult form.
- Up to 120mm long, half grown ones similar size to Jorunna tomentosa.
- Mantle usually yellow or buff-orange, often with large blotches of bright colours [3Ap].
- Variously sized spiculose tubercles give stiff unyielding feel to mantle.
- Gills often blotched with colour.
- Gills tilt backwards, not upwards from a raised collar.
- Underside of mantle lacks dark markings (may have slight staining at edge) [4Ap].
- Head small with vestigal oral tentacles.
- Up to 60mm long, similar size to many Archidoris pseudoargus.
- Sandy , buff, whitish (Flickr) or bluish white (Flickr), any other marks small and dark.
- Very small tubercles; velvety appearance, soft feel.
- Large pale gills around dark brown anus .
- Base of extended gills surrounded by raised collar .