An educational resource dedicated mainly to the photography
and diversity of marine life that can be found in coastal waters
and intertidal areas of Great Britain and Ireland by David Fenwick.

Sea Squirts and Ascidians (Tunicate images)
Ascidiacea (Class) > Aplousobranchia (Order) > Clavelinidae (Family)

Clavelina lepadiformis (Müller, 1776)
- Transparent or Light bulb sea squirt

Ascidiacea (Class) > Aplousobranchia (Order) > Didemnidae (Family)

Didemnum maculosum (Milne-Edwards, 1841)
- A didemnid sea squirt

Didemnum maculosum (Milne-Edwards, 1841)
var. dentata - A didemnid sea squirt

Didemnum vexillum Kott, 2002 - Carpet sea aquirt
(invasive non-native species)

Diplosoma listerianum (Milne-Edwards, 1841)
- Jelly crust tunicate

Diplosoma spongiforme (Giard, 1872)
- A didemnid sea squirt

Lissoclinum perforatum (Giard, 1872)
- White perforated sea squirt

Polysyncraton bilobatum Lafargue, 1968
- A didemnid sea squirt

Unknown species of didemnid with white spotted
inhalant openings - The Lizard 25.09.14

Unknown species of mauve didemnid
- Newlyn Marina 12.09.15

Ascidiacea (Class) > Aplousobranchia (Order) > Polyclinidae (Family)

Aplidium coeruleum Lahille, 1890 ? - A sea squirt
Aplidium elegans (Giard, 1872) - Sea strawberry
Aplidium cf. glabrum - A sea squirt
Aplidium nordmanni (Milne-Edwards, 1841) - A sea squirt
Aplidium pallidum (Verrill, 1871) - White flake-ascidian Aplidium punctum (Giard, 1873) - A sea squirt
Aplidium turbinatum (Savigny, 1816) - A sea squirt
Aplidium sp. - Wherry Rocks, Penzance, 06.04.12,
and other locations - A sea squirt

Aplidium elegans and A. turbinatum synonymous with Sidnyum elegans and Sidnyum turbinatum.

Morchellium argus (Milne-Edwards, 1841) - A sea squirt

Polyclinum aurantium Milne Edwards, 1841 - possibly?

Sand encrusted polyclinid sea squirts

Ascidiacea (Class) > Phlebobranchia (Order) >
Ascidiidae (Family)

Ascidia conchilega Muller, 1776 - A sea squirt
Ascidia mentula Müller, 1776 - A sea squirt

Ascidiella aspersa (Müller, 1776)
- Fluted or Dirty sea squirt

Ascidiella scabra (Müller, 1776) - A sea squirt

Phallusia mammillata (Cuvier, 1815)
- Neptune's Heart or White sea squirt

Ascidiacea (Class) > Phlebobranchia (Order) >
Cionidae (Family)

Ciona intestinalis (Linnaeus, 1767)
- Yellow-ringed sea squirt or Sea vase

Ciona robusta Hoshino & Tokioka, 1967 - was (Type A)
- A sea squirt (non-native species)

Ascidiacea (Class) > Phlebobranchia (Order) >
Corellidae (Family)

Corella eumyota Traustedt, 1882
- Orange-tipped sea squirt (invasive non-native species)

Ascidiacea (Class) > Phlebobranchia (Order) > Perophoridae (Family)

Perophora listeri Wiegman, 1835 - A sea squirt
Perophora japonica Oka, 1927 - Creeping sea squirt
(invasive non-native species)

Ascidiacea (Class) > Stolidobranchia (Order) > Molgulidae (Family)

Molgula complanata Alder & Hancock, 1870 ?
Molgula manhattensis (De Kay, 1843) ? - Sea grapes
Molgula socialis Alder, 1863? - A sea squirt
Molgula sp. (Woolacombe, Devon, 19.09.17)

Ascidiacea (Class) > Stolidobranchia (Order) >
Pyuridae (Family)

Microcosmus claudicans (Savigny, 1816) - A sea squirt

Pyura microcosmus (Savigny, 1816) - A sea squirt
Pyura tessellata (Forbes, 1848) - A sea squirt

Ascidiacea (Class) > Stolidobranchia (Order) >
Styelidae (Family)

Asterocarpa humilis (Heller, 1878) - Compass sea squirt (invasive non-native species)

Botrylloides diegensis Ritter & Forsyth, 1917
- San Diego or Chain sea squirt
(invasive non-native species)

Botrylloides leachii (Savigny, 1816)
- A colonial ascidian / sea squirt

Botrylloides violaceus Oka, 1927
- Orange cloak or Orange sheath sea squirt
(invasive non-native species)

The Botryllus section is currently in the process of being expanded. New pages are in the process of being added to show the variation and variety of colour morphs of members of this genus.
Botryllus schlosseri (Pallas, 1766) - Star ascidian
Botryllus schlosseri (Pallas, 1766)
- Star ascidian images from Newlyn, Cornwall.

Botryllus schlosseri (Pallas, 1766)
- Star ascidian - Blue-green morphs

Botryllus schlosseri (Pallas, 1766)
- Star ascidian - Brown-cream morphs

Botryllus schlosseri - Star ascidian - tadpole larva

Dendrodoa grossularia (Van Beneden, 1846)
- Baked-bean sea squirt or Currant squirter

Distomus variolosus Gaertner, 1774
- Lesser gooseberry sea squirt

Polycarpa scuba Monniot C., 1971 - A sea squirt
Polycarpa violacea (Alder, 1863) ? - A sea squirt

Stolonica socialis Hartmeyer, 1903
- Orange sea grapes or squirt

Styela clava Herdman, 1881 - Leathery or Folded sea squirt (invasive non-native species)

Tunicates to be identified

Pelagic Tunicates

Appendicularia (Class) > Copelata (Order) > Oikopleuridae (Family) > Oikopleurinae (Subfamily) > Labiata (Tribe)

Oikopleura (Vexillaria) dioica Fol, 1872
- A pelagic tunicate

Thaliacea (Class) > Doliolida (Order) > Doliolidina (Suborder) > Doliolidae (Family)

Doliolum species (Newlyn 04.07.17)
- A pelagic tunicate

Thaliacea (Class) > Salpida (Order) > Salpidae (Family) > Salpinae (Subfamily)

Salpa fusiformis Cuvier, 1804 - Common Salp with
amphipod Phronima sedentaria

Sea Squirt Ascidian Tunicate Images UK