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Breakdown of Known Hawaiian Opisthobranchs by Group*

Group # spp.
%
Cephalaspidea (trad.)
98
18.4
     Acteonoidea
11
2.1
     Cephalaspidea 85
16.0
     Runcinacea
2
0.4
Thecosomata 25
4.7
Gymnosomata 5
0.9
Anaspidea 14
2.6
Sacoglossa 65
12.2
Notaspidea (trad.)
18
3.4
     Tylodinoidea 4
0.8
     Pleurobranchomorpha 14
2.6
Nudibranchia 307
57.7
     Doridacea 191
35.9
          cryptobranchs
142
26.7
          phanerobranchs
49
9.2
     Dendronotacea 18
3.4
     Arminacea 6
1.1
     Aeolidacea 92
17.3
Total
532

 
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
19.8
     Acteonoidea 11
2.2
     Cephalaspidea 85
17.2
     Runcinacea
2
0.4
Anaspidea 13
2.6
Sacoglossa 65
13.2
Notaspidea (trad.) 18
3.6
     Tylodinoidea 4
0.8
     Pleurobranchomorpha 14
2.8
Nudibranchia 300
60.7
     Doridacea 191
38.7
          cryptobranchs
142
28.7
          phanerobranchs
49
9.9
     Dendronotacea 15
3.0
     Arminacea 6
1.2
     Aeolidacea 88
17.8
Total
494


*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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