New Copepod — Bowman 
421 
oratory at low temperatures, fresh-water cope- 
pods ( Cyclops ) tend to reach a larger size (Coker, 
1933) and to have longer and narrower furcae 
(Coker, 1934). Steuer (1925, 1931, 1932) has 
erected ''forma” and geographic races for 
several species of marine copepods; the larger 
forms were from the colder parts of the geo- 
graphic range or from deeper, hence colder 
water. Recently, Deevey (1952) reviewed the 
subject of seasonal variations in size in marine 
copepods; her own studies showed an inverse 
correlation between temperature and size in 
Centropages typicus and C. hamatus. 
Because of these findings, it is necessary 
to consider the possibility that the two forms 
of Calanus ( tenuicornis and lighti ) are actually 
ecophenotypes. If such were the case we 
would expect to find the largest specimens 
in the coldest water, with a gradual and more 
or less continuous decrease in size to the 
south. Instead of this, it has been pointed out 
that the smaller, more chunky form occurs 
in both colder and warmer water than the 
longer, more slender C. lighti. Hence it is clear 
that the two species are not temperature- 
induced ecophenotypes. 
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