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Breakdown of Known Hawaiian Opisthobranchs by Group*

Group # spp.
%
Cephalaspidea (trad.)
102
17.2
     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 343
57.9
     Doridacea 210
35.5
          cryptobranchs
156
26.4
          phanerobranchs
54
9.1
     Dendronotacea 21
3.5
     Arminacea 6
1.0
     Aeolidacea 107
18.1
Total
592

 
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
18.5
     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 337
61.2
     Doridacea 210
38.1
          cryptobranchs
156
28.3
          phanerobranchs
54
9.8
     Dendronotacea 18
3.3
     Arminacea 6
1.1
     Aeolidacea 103
18.7
Total
551

*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 692 heterobranch species for Hawaii and 651 benthic heterobranch species for Hawaii.
Group # spp.
Lower Heterobranchs
79
Marine Pulmonates 21
Prosobranchs (Velutinids, etc)
26

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