21 Jorunna tomentosa album; comparative image of Rostanga rubra.

Mantle bright scarlet. Characteristic white/pale yellow patch around bases of, and between, rhinophores looks like spectacles. Length 8.1 mm. Menai Strait, Wales. February 2014.

 

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 21Jt flic.kr/p/FQykVf to orange 22Jt flic.kr/p/22B7gLv , with sparse scattered black or reddish-brown spots. Characteristic white or pale yellow patch around bases of, and between, rhinophores looks like spectacles 21Jt flic.kr/p/FQykVf , sometimes indistinct 22Jt flic.kr/p/22B7gLv . 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 23Jt flic.kr/p/FQykoo

4: Translucent, pink, unipinnate gills held erect to form cylinder around brown tubular anus 24Jt flic.kr/p/22B7gmH .

5: Base of extended gills surrounded by slightly raised rim bearing caryophyllidia, not a distinct collar-like sheath 24Jt flic.kr/p/22B7gmH .

6: Slender tapered oral tentacles 25Jt flic.kr/p/FQykhm .

7: Convex body with raised profile 22Jt flic.kr/p/22B7gLv .

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 23Jt flic.kr/p/FQykoo .

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 1Jt flic.kr/p/EjpcXr , reddish brown, grey-white, grey-cream, yellow 2Jt flic.kr/p/K2ALfV , yellow cream 3Jt flic.kr/p/EjpceH , buff-orange, or white 4Jt flic.kr/p/K2AJ14. Small opaque white glandular structures near periphery of mantle 3Jt flic.kr/p/EjpceH but sometimes not discernible 1Jt flic.kr/p/EjpcXr . Usually, scattered small dark spots and a few dark blotches in a longitudinal row on each side 5Jt flic.kr/p/EjpbfP ; sometimes blotches absent, or few and small 11Jt flic.kr/p/22B75ok and occasionally the small spots are absent.

3: Mantle has crowded, small, match-like, retractile tubercles (caryophyllidia) 8Jt flic.kr/p/K2AFXB 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 2Jt flic.kr/p/K2ALfV & 4Jt flic.kr/p/K2AJ14 . Gills are often paler than the mantle and sometimes have dark dots.

5: Base of extended gills surrounded by distinct collar-like sheath 9Jt flic.kr/p/22B7oGe which closes over the gills when they are retracted into a pit 12Jt flic.kr/p/22B7nRM .

6: Slender tapered oral tentacles 15Jt flic.kr/p/K2AEjX .

7: Convex body with raised profile 7Jt flic.kr/p/22B7pn2 .

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 8Jt flic.kr/p/K2AFXB .

9: Posterior of foot protrudes when in motion 19Jt flic.kr/p/22B7iPD .

 

Full SPECIES DESCRIPTION: flic.kr/p/K2ALfV

Key id. features: flic.kr/p/EjpcXr

Sets of OTHER SPECIES:

www.flickr.com/photos/56388191@N08/collections/

 

Done