Rhinophores translucent white or yellowish with opaque white and brown spots on the lamellae which are deeply cleft and widely separated at the anterior. Rhinophores surrounded by stout caryophyllidia with short projecting spicules. Length of animal 8.4 mm. Menai Strait, Wales. February 2013.
FULL 9 POINT COMPARISON with J. tomentosa:
Rostanga rubra (Risso, 1818)
1: Up to 15 mm long (20 mm in Mediterranean).
2: Mantle bright scarlet 21 Jorunna tomentosa album; comparative image of Rostanga rubra. to orange 22 Jorunna tomentosa album; comparative images of Rostanga rubra. , with sparse scattered black or reddish-brown spots. Characteristic white or pale yellow patch around bases of, and between, rhinophores looks like spectacles 21 Jorunna tomentosa album; comparative image of Rostanga rubra. , sometimes indistinct 22 Jorunna tomentosa album; comparative images of Rostanga rubra. . Many opaque white glands on periphery of mantle.
3: Mantle covered with densely packed caryophyllidia which are thicker than those on J. tomentosa with shorter projecting spicules 23 Jorunna tomentosa album; comparative image of Rostanga rubra rhinophores.
4: Translucent, pink, unipinnate gills held erect to form cylinder around brown tubular anus 24 Jorunna tomentosa album; comparative image of Rostanga rubra .
5: Base of extended gills surrounded by slightly raised rim bearing caryophyllidia, not a distinct collar-like sheath 24 Jorunna tomentosa album; comparative image of Rostanga rubra .
6: Slender tapered oral tentacles 25 Jorunna tomentosa album; comparative images of Rostanga rubra. .
7: Convex body with raised profile 22 Jorunna tomentosa album; comparative images of Rostanga rubra. .
8: Rhinophores translucent white or yellowish with opaque white and brown spots on the lamellae which are deeply cleft and widely separated at the anterior 23 Jorunna tomentosa album; comparative image of Rostanga rubra rhinophores. .
9: Posterior of foot protrudes a little at the posterior when in motion.
Jorunna tomentosa
1: Length up to 30 mm (Neuhaus et al, 2021), 55 mm (Thompson and Brown, 1984), often a similar size to Doris pseudoargus.
2: Dorsally, sandy-brown 01 Jorunna tomentosa. Length 60 mm. Intertidal. Orkney. April 1975. , reddish brown, grey-white, grey-cream, yellow 02 Jorunna tomentosa. , yellow cream 03 Jorunna tomentosa. Length 55mm. Menai Strait, Wales. June 2013. , buff-orange, or white 04 Jorunna tomentosa. West Anglesey, Wales. March 2014.. Small opaque white glandular structures near periphery of mantle 03 Jorunna tomentosa. Length 55mm. Menai Strait, Wales. June 2013. but sometimes not discernible 01 Jorunna tomentosa. Length 60 mm. Intertidal. Orkney. April 1975. . Usually, scattered small dark spots and a few dark blotches in a longitudinal row on each side 05 Jorunna tomentosa. Split, Croatia. November 2012. © J. Prkić . ; sometimes blotches absent, or few and small 11 Jorunna tomentosa. 55mm long. Menai Strait, Wales. June, 2013. and occasionally the small spots are absent.
3: Mantle has crowded, small, match-like, retractile tubercles (caryophyllidia) 08 Jorunna tomentosa. Rhinophores from 34 mm and 55 mm long animals. Menai Strait, Wales. with a ring of sharp projecting spicules surrounding the rounded apex. Body has velvety appearance and soft feel.
4: Large yellow-cream to grey gills around brown anal papilla 02 Jorunna tomentosa. & 04 Jorunna tomentosa. West Anglesey, Wales. March 2014. . Gills are often paler than the mantle and sometimes have dark dots.
5: Base of extended gills surrounded by distinct collar-like sheath 09 Jorunna tomentosa, gills and gill sheath. Lengths of animals 55mm and 43mm. Anglesey, Wales. which closes over the gills when they are retracted into a pit 12 Jorunna tomentosa. Length of animal 43mm. Menai Strait, Wales. February 2014. .
6: Slender tapered oral tentacles 15 Jorunna tomentosa. Animal 55mm long. Menai Strait, Wales. June, 2013. .
7: Convex body with raised profile 07 Jorunna tomentosa. West Anglesey, Wales. March 2014. .
8: Short, stout rhinophores have a translucent whitish, or slightly tinted, basal stem and a conical, lamellated, yellow-cream to grey, distal part bearing red to brown pigment dots/marks 08 Jorunna tomentosa. Rhinophores from 34 mm and 55 mm long animals. Menai Strait, Wales. .
9: Posterior of foot protrudes when in motion 19 Jorunna tomentosa. Length 43mm. Menai Strait, Wales. February 2014. .