Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list	Breakdown of Known Hawaiian Opisthobranchs by Group* Group # spp. % Cephalaspidea (trad.) 102 17.1      Acteonoidea 12 2.0      Cephalaspidea 88 14.7      Runcinida 2 0.3 Thecosomata 28 4.7 Gymnosomata 5 0.8 Anaspidea 16 2.7 Sacoglossa 75 12.6 Notaspidea (trad.) 20 3.4      Umbraculoidea 4 0.7      Pleurobranchomorpha 16 2.7 Nudibranchia 350 58.6      Doridacea 216 36.2           cryptobranchs 158 26.5           phanerobranchs 58 9.7      Dendronotacea 22 3.7      Arminacea 6 1.0      Aeolidacea 107 17.9 Total 597   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 18.3      Acteonoidea 12 2.2      Cephalaspidea 88 15.8      Runcinida 2 0.4 Anaspidea 15 2.7 Sacoglossa 75 13.5 Notaspidea (trad.) 20 3.6      Umbraculoidea 4 0.7      Pleurobranchomorpha 16 2.9 Nudibranchia 343 61.7      Doridacea 216 38.8           cryptobranchs 159 28.6           phanerobranchs 58 10.4      Dendronotacea 19 3.4      Arminacea 6 1.1      Aeolidacea 103 18.5 Total 556 *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 697 heterobranch species for Hawaii and 656 benthic heterobranch species for Hawaii. Group # spp. Lower Heterobranchs 79 Marine Pulmonates 21 Prosobranchs (Velutinids, etc) 28
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