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Breakdown of Known Hawaiian Opisthobranchs by Group*

Group # spp.
%
Cephalaspidea (trad.)
98
17.5
     Acteonoidea
11
2.0
     Cephalaspidea 85
15.2
     Runcinida
2
0.4
Thecosomata 28
5.0
Gymnosomata 5
0.9
Anaspidea 14
2.5
Sacoglossa 74
13.2
Notaspidea (trad.)
20
3.6
     Umbraculoidea
4
0.7
     Pleurobranchomorpha 16
2.8
Nudibranchia 321
57.3
     Doridacea 195
34.8
          cryptobranchs
146
26.1
          phanerobranchs
49
8.8
     Dendronotacea 21
3.8
     Arminacea 6
1.1
     Aeolidacea 99
17.7
Total
560

 
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.)
98
18.9
     Acteonoidea 11
2.1
     Cephalaspidea 85
16.4
     Runcinida
2
0.4
Anaspidea 13
2.5
Sacoglossa 74
14.2
Notaspidea (trad.) 20
3.8
     Umbraculoidea
4
0.8
     Pleurobranchomorpha 16
3.1
Nudibranchia 314
60.5
     Doridacea 195
37.6
          cryptobranchs
146
28.1
          phanerobranchs
49
9.4
     Dendronotacea 18
3.5
     Arminacea 6
1.2
     Aeolidacea 95
18.3
Total
519

*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 660 heterobranch species for Hawaii and 619 benthic heterobranch species for Hawaii.
Group # spp.
Lower Heterobranchs
79
Marine Pulmonates 21
Prosobranchs (Velutinids, etc)
25

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