Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list	Breakdown of Known Hawaiian Opisthobranchs by Group* Group # spp. % Cephalaspidea (trad.) 98 17.5      Acteonoidea 11 2.0      Cephalaspidea 85 15.2      Runcinida 2 0.4 Thecosomata 28 5.0 Gymnosomata 5 0.9 Anaspidea 14 2.5 Sacoglossa 74 13.2 Notaspidea (trad.) 20 3.6      Umbraculoidea 4 0.7      Pleurobranchomorpha 16 2.8 Nudibranchia 321 57.3      Doridacea 195 34.8           cryptobranchs 146 26.1           phanerobranchs 49 8.8      Dendronotacea 21 3.8      Arminacea 6 1.1      Aeolidacea 99 17.7 Total 560   For those who are interested in figures for the benthic fauna, the following table excludes the pelagic/planktonic species in the Thecosomata and Gymnosomata as well as Stylocheilus longicauda, Cephalopyge trematoides, Phylliroe bucephala, Doto sp. #1, Tergipes sp. #1, Fiona pinnata, Glaucus marginatus and Glaucus atlanticus. Group # spp. % Cephalaspidea (trad.) 98 18.9      Acteonoidea 11 2.1      Cephalaspidea 85 16.4      Runcinida 2 0.4 Anaspidea 13 2.5 Sacoglossa 74 14.2 Notaspidea (trad.) 20 3.8      Umbraculoidea 4 0.8      Pleurobranchomorpha 16 3.1 Nudibranchia 314 60.5      Doridacea 195 37.6           cryptobranchs 146 28.1           phanerobranchs 49 9.4      Dendronotacea 18 3.5      Arminacea 6 1.2      Aeolidacea 95 18.3 Total 519 *Not included are three species each in the Rhodopemorpha and Acochlidimorpha that Bouchet, et. al., 2017 place, respectively, with the Lower Heterobranchs and Marine Pulmonates. For reference, here are the number of species included in the addendums on our site. They add 100 non-opisthobranch heterobranchs making the totals 660 heterobranch species for Hawaii and 619 benthic heterobranch species for Hawaii. Group # spp. Lower Heterobranchs 79 Marine Pulmonates 21 Prosobranchs (Velutinids, etc) 25
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