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Breakdown of Known Hawaiian Opisthobranchs by Group*

Group # spp.
%
Cephalaspidea (trad.)
98
18.2
     Acteonoidea
11
2.0
     Cephalaspidea 85
15.8
     Runcinacea
2
0.4
Thecosomata 25
4.6
Gymnosomata 5
0.9
Anaspidea 14
2.6
Sacoglossa 69
12.8
Notaspidea (trad.)
18
3.4
     Umbraculoidea
4
0.7
     Pleurobranchomorpha 14
2.6
Nudibranchia 308
57.4
     Doridacea 192
35.8
          cryptobranchs
143
26.6
          phanerobranchs
49
9.1
     Dendronotacea 18
3.4
     Arminacea 6
1.1
     Aeolidacea 92
17.1
Total
537

 
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
19.6
     Acteonoidea 11
2.2
     Cephalaspidea 85
17.0
     Runcinacea
2
0.4
Anaspidea 13
2.6
Sacoglossa 69
13.8
Notaspidea (trad.) 18
3.6
     Umbraculoidea
4
0.8
     Pleurobranchomorpha 14
2.8
Nudibranchia 301
60.3
     Doridacea 192
38.5
          cryptobranchs
143
28.6
          phanerobranchs
49
9.8
     Dendronotacea 15
3.0
     Arminacea 6
1.2
     Aeolidacea 88
17.6
Total
499


*Not included are three species each in the Rhodopemorpha and Acochlidimorpha that Bouchet, et. al., 2017 place, respectively, with the Lower Heterobranchs and Pulmonates.

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