Left: Yellowish mantle with large blotches of bright colours. Variously sized, rounded tubercles. Purple gills. L. 60 mm. North Wales. March 2012.
Right: Yellow specimen superficially like J. tomentosa; differentiated by purple gills. L. 35 mm. North Wales. June 2013.
FULL 9 POINT COMPARISON with J. tomentosa:
Doris pseudoargus Rapp, 1827.
1: Up to 120 mm long, but often similar size to Jorunna tomentosa.
2: Usually yellowish, often with large blotches of bright colours. 27 Jorunna tomentosa album; comparative image of Doris pseudoargus. .
3: Variously sized, rounded, spiculose tubercles give stiff unyielding feel to mantle.
4: Voluminous gills often blotched with variable amount of lilac/purple . Anal papilla similar colour to surrounding gills, so may be brownish if gill colour thus 28 Jorunna tomentosa album; comparative images of Doris pseudoargus.
5: Base of gills not surrounded by collar-like sheath 28 Jorunna tomentosa album; comparative images of Doris pseudoargus. .
6: Short, thick, oral tentacles 29 Jorunna tomentosa album; comparative images of Doris pseudoargus. .
7: Convex body with raised profile.
8: Rhinophores have a translucent whitish, or slightly tinted, basal stem and a yellow or orange distal part with 20 or more lamellae, often with small flecks of opaque white. Conical, when retracted like on J. tomentosa, but much more slender than that species when extended 27. 27.1 Jorunna tomentosa album; comparative images of Doris pseudoargus..
9: Posterior of foot protrudes 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. .