Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list	Breakdown of Known Hawaiian Opisthobranchs by Group* Group # spp. % Cephalaspidea (trad.) 102 16.9      Acteonoidea 12 2.0      Cephalaspidea 89 14.8      Runcinida 2 0.3 Thecosomata 28 4.6 Gymnosomata 5 0.8 Anaspidea 16 2.6 Sacoglossa 75 12.4 Notaspidea (trad.) 20 3.3      Umbraculoidea 4 0.7      Pleurobranchomorpha 17 2.8 Nudibranchia 353 58.6      Doridacea 218 36.2           cryptobranchs 160 26.6           phanerobranchs 58 9.6      Dendronotacea 22 3.6      Arminacea 6 1.0      Aeolidacea 108 17.9 Total 602   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 18.2      Acteonoidea 12 2.1      Cephalaspidea 89 15.9      Runcinida 2 0.4 Anaspidea 15 2.7 Sacoglossa 75 13.4 Notaspidea (trad.) 20 3.6      Umbraculoidea 4 0.7      Pleurobranchomorpha 17 3.0 Nudibranchia 346 61.7      Doridacea 218 38.8           cryptobranchs 161 28.7           phanerobranchs 58 10.3      Dendronotacea 19 3.4      Arminacea 6 1.1      Aeolidacea 104 18.5 Total 561 *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 702 heterobranch species for Hawaii and 661 benthic heterobranch species for Hawaii. Group # spp. Lower Heterobranchs 79 Marine Pulmonates 21 Prosobranchs (Velutinids, etc) 28
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