Quoy & Gaimard, 1832
Circumglobal - found in all warm water regions of the world.
UPPER: Long Reef, Collaroy, Sydney, NSW, in algal tide pools, ranging in length from 20-45mm. September 1978.
MIDDLE, LOWER: Port Stephens, New South Wales, Australia, 78mm long. October 1980.
PHOTOS: Bill Rudman.
Aplysia juliana is one of the few species of Aplysia that lacks the ink gland which produces the characteristic reddish purple ink. Instead the opaline gland, produces a milky white secretion. All aplysiids have an opaline gland, but the milky white secretion is usually marked by the purple ink. Aplysia juliana is also unusual in that the posterior end of the foot can form a temporary sucker. When the animal crawls along it can use the sucker to anchor itself then greatly extend its head and neck like a leech. Another aplysiid that does this is Dolabrifera dolabrifera.
There are quite a few colour forms of this species which are at present unable to be separated on anatomical grounds. the brownish form with pale spots (top photo) is one of the most common forms, as is one with a uniform black colouration. The other photos here represent a colour form associated with Bergh's Aplysia sibogae, which is considered a synonym.
See the General Topics List for more information on Sea Hares.
• Quoy, J.R. & Gaimard, J.P. (1832). Voyage de decouvertes de L'Astrolabe pendant les annees 1826-1827-1828-1829, sous le commandement de M.J. Dumont D'Urville, Zoologie, 2: 1-686.
Rudman, W.B., 1999 (May 3) Aplysia juliana Quoy & Gaimard, 1832. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/aplyjuli
Sea hares from Tristan da Cunha
From: Sue Scott, June 1, 2010
Aplysia juliana? from Reunion Island
From: Philibert Bidgrain, January 31, 2007
Re: Aplysia juliana in my aquarium
From: Michelle Yerman, May 25, 2006
Aplysia juliana in my aquarium
From: Michelle Yerman, May 19, 2006
Aplysia juliana eaten by Flatworm
From: Lisa Kirkendale, April 10, 2006
Re: Sea Hares laying noodle shaped things in tank
From: Marcus van Riet, December 17, 2005
Sea Hares laying noodle shaped things in tank
From: Marcus van Riet, December 6, 2005
Aplysia juliana? in Kiama rock pools, NSW
From: Francis Hawkshaw, August 9, 2005
Aplysia juliana being eaten by crab
From: Dong Bum Koh, June 7, 2005
Aplysia juliana laying eggs
From: Dong Bum Koh, May 25, 2005
Aplysia juliana - breeding in Tasmania
From: Melanie Godfrey-Smith, November 16, 2003
Aplysia juliana - breeding in NZ
From: Paul Furneaux, August 16, 2003
Aplysia juliana from New Zealand
From: Paul Furneaux, June 30, 2003
Sea hares, mating pair - from Sydney
From: Iain Whyte, November 30, 2002
Aplysia juliana from Korea
From: Ronald Noseworthy, June 19, 2002
Re: Aplysia from Taiwan
From: Tony Wright, April 16, 2001
Aplysia from Taiwan
From: Tony Wright, April 14, 2001
Sea Slug feeding and babies
From: Andrew McDonald, February 16, 2000