Opisthobranch speciesThe following list represent species likely to be seen around the British Isles. Not all can be seen, or have been recorded, around Scotland. |
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| Supra-order OPISTHOBRANCHIA | |
| Order CEPHALASPIDEA | |
| Family Diaphanidae | |
| Colpodaspis M. Sars, 1870 | |
| Colpodaspis pusilla M. Sars, 1870 |  |
| Family Philinidae | |
| Laona Adams, 1865 | |
| Laona pruinosa (Clark W., 1827) |  |
| Philine Ascanius, 1772 | |
| Philine aperta (Linnaeus, 1767) | |
| Order GYMNOSOMATA | |
| Family Clionidae | |
| Clione Pallas, 1774 | |
| Clione limacina (Phipps, 1774) | |
| Order NOTASPIDEA | |
| Family Pleurobranchidae | |
| Berthella Blainville, 1825 | |
| Berthella plumula (Montagu, 1803) |  |
| Berthella sideralis Lovén, 1846 | |
| Pleurobranchus Cuvier, 1804 | |
| Pleurobranchus membranaceus (Montagu, 1815) |  |
| Order SACOGLOSSA | |
| Family Aplysiidae | |
| Aplysia Linnaeus, 1767 | |
| Aplysia fasciata Poiret, 1789 | |
| Aplysia punctata (Cuvier, 1803) |  |
| Family Elysiidae | |
| Elysia Risso, 1818 | |
| Elysia viridis (Montagu, 1804) |  |
| Family Hermaeidae | |
| Hermaea Lovèn, 1844 | |
| Hermaea bifida (Montagu, 1815) |  |
| Family Stiligeridae | |
| Placida Trinchese, 1876 | |
| Placida dendritica (Alder & Hancock, 1843) |  |
| Order NUDIBRANCHIA | |
| Family Goniodorididae | |
| Goniodoris Forbes & Goodsir, 1839 | |
| Goniodoris castanea Alder & Hancock, 1845 |  |
| Goniodoris nodosa (Montagu, 1808) |  |
| Family Okeniidae | |
| Okenia Menke, 1830 | |
| Okenia aspersa (Alder & Hancock, 1845) | |
| Okenia elegans (Leuckart, 1828) | |
| Okenia leachii (Alder & Hancock, 1854) | |
| Ancula Lovén, 1846 | |
| Ancula gibbosa (Risso, 1818) |  |
| Trapania Pruvot-Fol, 1931 | |
| Trapania maculata Haefelfinger, 1960 | |
| Trapania pallida Kress, 1968 | |
| Trapania tartanella (Ihering, 1886) | |
| Family Onchidorididae | |
| Onchidoris Blainville, 1816 | |
| Onchidoris bilamellata (Linnaeus, 1767) |  |
| Onchidoris depressa (Alder & Hancock, 1842) | |
| Onchidoris inconspicua (Alder & Hancock, 1851) | |
| Onchidoris muricata (O F Müller, 1776) |  |
| Onchidoris oblonga (Alder & Hancock, 1845) | |
| Onchidoris pusilla (Alder & Hancock, 1845) | |
| Onchidoris sparsa (Alder & Hancock, 1846) | |
| Diaphorodoris Iredale & O'Donoghue, 1923 | |
| Diaphorodoris luteocincta (M Sars, 1870) |  |
| Acanthodoris J E Gray, 1850 | |
| Acanthodoris pilosa (Abildgaard in O F Müller, 1789) |  |
| Adalaria Bergh, 1878 | |
| Adalaria loveni (Alder & Hancock, 1862) | |
| Adalaria proxima (Alder & Hancock, 1854) |  |
| Family Triophidae | |
| Crimora Alder & Hancock, 1862 | |
| Crimora papillata Alder & Hancock, 1862 |  |
| Family Aegiretidae | |
| Aegires Lovén, 1844 | |
| Aegires punctilucens (Orbigny, 1837) |  |
| Family Polyceridae | |
| Polycera Cuvier, 1817 | |
| Polycera faeroensis Lemche, 1929 |  |
| Polycera quadrilineata (O F Müller, 1776) |  |
| Greilada Bergh, 1894 | |
| Greilada elegans Bergh, 1894 | |
| Limacia O F Müller, 1781 | |
| Limacia clavigera (O F Müller, 1776) |  |
| Palio J E Gray, 1857 | |
| Palio dubia (M Sars, 1829) | |
| Palio nothus (Johnston, 1838) | |
| Thecacera Fleming, 1828 | |
| Thecacera pennigera (Montagu, 1813) | |
| Family Chromodorididae | |
| Cadlina Bergh, 1878 | |
| Cadlina laevis (Linnaeus, 1767) |  |
| Family Aldisidae | |
| Aldisa Bergh, 1878 | |
| Aldisa zetlandica (Alder & Hancock, 1854) | |
| Family Rostangidae | |
| Rostanga Bergh, 1879 | |
| Rostanga rubra (Risso, 1818) |  |
| Family Dorididae | |
| Doris Linnaeus, 1758 | |
| Doris ocelligera Bergh, 1881) | |
| Doris pseudoargus (Rapp, 1827) |  |
| Doris sticta (Iredale & O'Donoghue, 1923) | |
| Family Archidorididae | |
| Atagema J E Gray, 1850 | |
| Atagema gibba Pruvot-Fol, 1951 | |
| Family Discodorididae | |
| Geitodoris Bergh, 1891 | |
| Geitodoris planata (Alder & Hancock, 1846) |  |
| Family Kentrodorididae | |
| Jorunna Bergh, 1876 | |
| Jorunna tomentosa (Cuvier, 1804) |  |
| Family Arminidae | |
| Armina Rafinesque, 1814 | |
| Armina loveni (Bergh, 1860) |  |
| Family Janolidae | |
| Janolus Bergh, 1884 | |
| Janolus cristatus (delle Chiaje, 1841) |  |
| Janolus hyalinus (Alder & Hancock, 1854) | |
| Proctonotus Alder, 1844 | |
| Proctonotus mucroniferus (Alder & Hancock, 1844) | |
| Family Heroidae | |
| Hero Alder & Hancock, 1855 | |
| Hero formosa (Lovén, 1841) |  |
| Family Tritoniidae | |
| Tritonia Cuvier, 1797 | |
| Tritonia hombergii (Cuvier, 1803) |  |
| Tritonia lineata (Alder & Hancock, 1848) |  |
| Tritonia manicata (Deshayes, 1853) | |
| Tritonia nilsodhneri (Marcus, 1983) | |
| Tritonia plebeia (Johnston, 1828) |  |
| Family Lomanotidae | |
| Lomanotus Verany, 1844 | |
| Lomanotus genei Verany, 1846 |  |
| Lomanotus marmoratus (Alder & Hancock, 1845) | |
| Family Scyllaeidae | |
| Scyllaea Linnaeus, 1758 | |
| Scyllaea pelagica Linnaeus, 1758 | |
| Family Hancockiidae | |
| Hancockia Gosse, 1877 | |
| Hancockia uncinata (Hesse, 1872) |  |
| Family Dendronotidae | |
| Dendronotus Alder & Hancock, 1845 | |
| Dendronotus frondosus (Ascanius, 1774) |  |
| Dendronotus lacteus (Thompson, 1840) |  |
| Family Dotidae | |
| Doto Oken, 1815 | |
| Doto coronata (Gmelin, 1791) |  |
| Doto cuspidata Alder & Hancock, 1862 | |
| Doto dunnei Lemche, 1976 |  |
| Doto eireana Lemche, 1976 | |
| Doto fragilis (Forbes, 1838) |  |
| Doto hydrallmaniae Morrow, Thorpe & Picton, 1992 | |
| Doto hystrix Picton & Brown, 1981 |  |
| Doto koenneckeri Lemche, 1976 | |
| Doto lemchei Ortea & Urgorri, 1978 | |
| Doto maculata (Montagu, 1804) |  |
| Doto millbayana Lemche, 1976 | |
| Doto onusta Hesse, 1872 | |
| Doto pinnatifida (Montagu, 1804) |  |
| Doto sarsiae Morrow, Thorpe & Picton, 1992 | |
| Doto tuberculata Lemche, 1976 | |
| Family Embletoniidae | |
| Embletonia Alder & Hancock, 1851 | |
| Embletonia pulchra (Alder & Hancock, 1844) | |
| Family Flabellinidae | |
| Flabellina Voigt, 1834 | |
| Flabellina browni Picton, 1980 |  |
| Flabellina gracilis (Alder & Hancock, 1844) |  |
| Flabellina lineata (Lovén, 1846) |  |
| Flabellina nobilis (Verrill, 1880) |  |
| Flabellina pedata (Montagu, 1815) |  |
| Flabellina pellucida (Alder & Hancock, 1843) |  |
| Flabellina verrucosa (M Sars, 1829) |  |
| Family Tergipedidae | |
| Tergipes Cuvier, 1805 | |
| Tergipes tergipes (Forsskål, 1775) |  |
| Catriona Winckworth, 1941 | |
| Catriona gymnota (Couthouy, 1838) |  |
| Cuthon Alder & Hancock, 1855 | |
| Cuthona nana (Alder & Hancock, 1842) |  |
| Tenellia adspersa (Nordmann, 1844) | |
| Trinchesia Ihering, 1879 | |
| Trinchesia amoena (Alder & Hancock, 1845) |  |
| Trinchesia caerulea (Montagu, 1804) |  |
| Trinchesia concinna (Alder & Hancock, 1843) |  |
| Trinchesia foliata (Forbes & Goodsir, 1839) | |
| Trinchesia genovae (O'Donoghue, 1926) | |
| Trinchesia pustulata (Alder & Hancock, 1854) |  |
| Trinchesia rubescens Picton & Brown, 1978 |  |
| Trinchesia viridis (Forbes, 1840) |  |
| Family Eubranchidae | |
| Eubranchus Forbes, 1838 | |
| Eubranchus doriae (Trinchese, 1874) | |
| Eubranchus exiguus (Alder & Hancock, 1848) |  |
| Eubranchus farrani (Alder & Hancock, 1844) |  |
| Eubranchus pallidus (Alder & Hancock, 1842) |  |
| Eubranchus tricolor Forbes, 1838 |  |
| Eubranchus vittatus (Alder & Hancock, 1842) |  |
| Family Cumanotidae | |
| Cumanotus Odhner, 1907 | |
| Cumanotus beaumonti (Eliot, 1906) | |
| Family Fionidae | |
| Fiona Alder & Hancock in Forbes & Hanley, 1851 | |
| Fiona pinnata (Eschscholtz, 1831) | |
| Family Calmidae | |
| Calma Alder & Hancock, 1855 | |
| Calma glaucoides (Alder & Hancock, 1854) | |
| Family Pseudovermidae | |
| Pseudovermis Periaslavzeff, 1891 | |
| Pseudovermis boadeni Salvini-Plawen & Sterrer, 1968 | |
| Family Facelinidae | |
| Facelina Alder & Hancock, 1855 | |
| Facelina annulicornis (Chamisso & Eysenhardt, 1821) |  |
| Facelina auriculata (O F Müller, 1776) |  |
| Facelina bostoniensis (Couthouy, 1838) |  |
| Facelina dubia Pruvot-Fol, 1949 | |
| Caloria Trinchese, 1888 | |
| Caloria elegans (Alder & Hancock, 1845) | |
| Family Favorinidae | |
| Favorinus J E Gray, 1850 | |
| Favorinus blianus Lemche & Thompson, 1974 |  |
| Favorinus branchialis (Rathke, 1806) |  |
| Dicata Schmekel, 1967 | |
| Dicata odhneri Schmekel, 1967 | |
| Family Aeolidiidae | |
| Aeolidia Cuvier, 1798 | |
| Aeolidia papillosa (Linnaeus, 1761) |  |
| Aeolidiella Bergh, 1867 | |
| Aeolidiella alderi (Cocks, 1852) | |
| Aeolidiella glauca (Alder & Hancock, 1845) |  |
| Aeolidiella sanguinea (Norman, 1877) | |