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Breakdown of Known Hawaiian Opisthobranchs by Group*

Group # spp.
%
Cephalaspidea (trad.)
102
17.0
     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
12.5
Notaspidea (trad.)
20
3.3
     Umbraculoidea
4
0.7
     Pleurobranchomorpha 16
2.7
Nudibranchia 352
58.8
     Doridacea 217
36.2
          cryptobranchs
159
26.5
          phanerobranchs
58
9.7
     Dendronotacea 22
3.7
     Arminacea 6
1.0
     Aeolidacea 108
18.0
Total
599

 
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
13.4
Notaspidea (trad.) 20
3.6
     Umbraculoidea
4
0.7
     Pleurobranchomorpha 16
2.9
Nudibranchia 345
61.8
     Doridacea 217
38.9
          cryptobranchs
160
28.7
          phanerobranchs
58
10.4
     Dendronotacea 19
3.4
     Arminacea 6
1.1
     Aeolidacea 104
18.6
Total
558

*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 699 heterobranch species for Hawaii and 658 benthic heterobranch species for Hawaii.
Group # spp.
Lower Heterobranchs
79
Marine Pulmonates 21
Prosobranchs (Velutinids, etc)
28

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