Short, thick, oral tentacle on either side of head
Left: body length 22 mm. Menai Strait, Wales. June 2013. Right: from Alder & Hancock (1845 to1855).
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 lemon yellow to red, frequently variegated with large blotches of colours such as purple, pink, red, brown, green and white. Plain yellow specimens superficially resemble J. tomentosa but often have a trace of purple on the gills 26 Jorunna tomentosa album; comparative images of Doris pseudoargus. & 27 Jorunna tomentosa album; comparative image of Doris pseudoargus. .
3: Variously sized, rounded, spiculose tubercles 27 Jorunna tomentosa album; comparative image of Doris pseudoargus. give a stiff unyielding feel to the mantle.
4: Voluminous gills resembling curled kale. Often blotched with variable amount of lilac or purple 26 Jorunna tomentosa album; comparative images of Doris pseudoargus. & 27 Jorunna tomentosa album; comparative image of Doris pseudoargus.. The anal papilla may be brownish if gills are dark 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 26 Jorunna tomentosa album; comparative images of Doris pseudoargus. .
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 a little 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. .