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Halocynthia papillosa , Photo: Michael Lahanas

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Tunicata
Classis: Ascidiacea
Ordo: Stolidobranchia

Familia: Pyuridae
Genus: Halocynthia
Species: H. papillosa

Halocyntia papillosa, also known as the red sea squirt is a sea peach or sea squirt, a species of tunicate.


This species occurs at depths of 2 to 100 metres It attaches itself to rocks and overhangs, or among Posidonia. It can be found in the Northeast Atlantic, Western Pacific, along the Portuguese coast, and the Mediterranean.[1]

Halocynthia papillosa is usually about 10 cm high but can reach 20 cm. It can contract when disturbed.[2]

"Halocynthia papillosa".
"Halocynthia papillosa - Red sea-squirt - Biology of the Tunicates". European Marine Life. 2007-10-07. Retrieved 2010-07-30.


Biology Encyclopedia

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