Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list	Breakdown of Known Hawaiian Opisthobranchs by Group* Group # spp. % Cephalaspidea (trad.) 102 17.3      Acteonoidea 12 2.0      Cephalaspidea 88 14.9      Runcinida 2 0.3 Thecosomata 28 4.7 Gymnosomata 5 0.8 Anaspidea 16 2.7 Sacoglossa 77 13.0 Notaspidea (trad.) 20 3.4      Umbraculoidea 4 0.7      Pleurobranchomorpha 16 2.7 Nudibranchia 341 57.8      Doridacea 209 35.3           cryptobranchs 155 26.3           phanerobranchs 54 9.2      Dendronotacea 21 3.6      Arminacea 6 1.0      Aeolidacea 106 18.0 Total 590   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, Unidentified Facelinid sp. #9, Fiona pinnata, Glaucus mcfarlanei and Glaucus atlanticus. Group # spp. % Cephalaspidea (trad.) 102 18.6      Acteonoidea 12 2.2      Cephalaspidea 88 16.0      Runcinida 2 0.4 Anaspidea 15 2.7 Sacoglossa 77 14.0 Notaspidea (trad.) 20 3.6      Umbraculoidea 4 0.7      Pleurobranchomorpha 16 2.9 Nudibranchia 335 61.0      Doridacea 209 38.1           cryptobranchs 155 28.2           phanerobranchs 54 9.8      Dendronotacea 18 3.3      Arminacea 6 1.1      Aeolidacea 102 18.6 Total 549 *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 690 heterobranch species for Hawaii and 649 benthic heterobranch species for Hawaii. Group # spp. Lower Heterobranchs 79 Marine Pulmonates 21 Prosobranchs (Velutinids, etc) 26
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