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Breakdown of Known Hawaiian Opisthobranchs by Group*

Group # spp.
%
Cephalaspidea (trad.)
100
17.4
     Acteonoidea
11
1.9
     Cephalaspidea 87
15.2
     Runcinida
2
0.3
Thecosomata 28
4.9
Gymnosomata 5
0.9
Anaspidea 16
2.8
Sacoglossa 74
12.9
Notaspidea (trad.)
20
3.5
     Umbraculoidea
4
0.7
     Pleurobranchomorpha 16
2.8
Nudibranchia 330
57.5
     Doridacea 203
35.4
          cryptobranchs
150
26.1
          phanerobranchs
53
9.2
     Dendronotacea 21
3.6
     Arminacea 6
1.0
     Aeolidacea 101
17.6
Total
574

 
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.)
100
18.8
     Acteonoidea 11
2.1
     Cephalaspidea 87
16.3
     Runcinida
2
0.4
Anaspidea 15
2.8
Sacoglossa 74
13.9
Notaspidea (trad.) 20
3.8
     Umbraculoidea
4
0.8
     Pleurobranchomorpha 16
3.0
Nudibranchia 324
60.8
     Doridacea 203
38.1
          cryptobranchs
150
28.1
          phanerobranchs
53
9.9
     Dendronotacea 18
3.4
     Arminacea 6
1.1
     Aeolidacea 97
18.2
Total
533

*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 674 heterobranch species for Hawaii and 633 benthic heterobranch species for Hawaii.
Group # spp.
Lower Heterobranchs
79
Marine Pulmonates 21
Prosobranchs (Velutinids, etc)
26

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