11. ECOLOQY OF DISTRIBUTION
325
(continued)
Pacific
Indian
4Q'N
E
C
W
40"s
E
C
W
40"s
N . of
40'N-40"s
s. of
N . of 40"s
Red
s. of
X
X
x
x
x
x
x
x
x
x
x
X
x
x
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x
x
x
x
x
x
x
x
X
x
x
x
x
x
x
x
x
x
x
x
x
X
x
x
x
x
x
x
x
x
x
X
x
x
x
X
x
x
x
x
x
x
x
x
x
x
x
x
?
x
x
x
x
x
x
?
x
x
x
x
x
x
X
x
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x
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x
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x
X
x
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Eight of these species are either meso- or bathypelagic. Ten species
live in all three oceans, Baker (personal communication) having
identified T . subaequalis from 90"E, 0"-37"s ; further sampling may
show that T . egregia occurs in the Indian as well as in the Atlantic
and Pacific Oceans and it is indeed probable that a twelfth species,
the rare bathypelagic T . spinicaudata, may also occur in all oceans.
Only one species, T . microphthalma, appears to be restricted to two
oceans, the Atlantic and Indian.
Meganyctiphanes. A single species, M . norvegim, confined to the
North Atlantic north of the 15OC isotherm a t 200 m.
Nyctiphanes. Four species all restricted to limited coastal regions
of relatively low temperature regimes, 9-13°C a t 200 m depth.