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234 Family Hippolytidae
Genus Thor Kingsley, 1878
Key to species
[Adapted from Chace, 1972]
1. No vestige of supraorbital tooth; anterolateral margin of carapace faintly angular,
with microscopic branchiostegal tooth; distal margin of telson armed typically with
4 pairs of spines; endopod of first pleopod of functional males with mesial margin
sparsely setose; appendix masculina (not including setae) of functional males falling
short of distal end of endopod of second pleopod; associated with sea anemones
(merus of first pereopod unarmed in distal half of inferior margin; eggs not very
large, increasing in major diameter during development from 0.48 to 0.70 mm)
T. amboinensis
Supraorbital tooth represented by obtuse prominence; anterolateral margin of
carapace rounded, unarmed; distal margin of telson armed with 3 pairs of spines;
endopod of first pleopod of functional males with mesial margin densely setose;
appendix masculina (not including setae) of functional males reaching nearly to, or
beyond, distal end of endopod of second pleopod; not usually associated with sea
anemones 2
2. (1) Merus of first pereopod armed with 1 or 2 spines in distal half of inferior margin
(dactyli of fourth and fifth pereopods commonly armed with 5—not usually 4 or 6~
spinules on inferior margin proximal to distal pair of spines; eggs not very large,
increasing in major diameter during development from 0.36 to 0.74 mm)..
T. dobkini
Merus of first pereopod unarmed in distal half of inferior margin 3
3. (2) Dactyli of fourth and fifth pereopods commonly armed with 4 or 5 (rarely 3 or 6)
spinules on inferior margin proximal to distal pair of spines; eggs large and few,
increasing in major diameter during development from 0.66 to 1.40 mm
T. floridanus
Dactyli of fourth and fifth pereopods commonly armed with 3 (sometimes 2 or 4)
spinules on inferior margin proximal to distal pair of spines; eggs not very large,
increasing in major diameter during development from 0.36 to 0.73 mm
T. manningi