Polyteny: A Source of Cryptic Speciation among Copepods

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Science  30 Sep 1966:
Vol. 153, Issue 3744, pp. 1641-1642
DOI: 10.1126/science.153.3744.1641


A large form of the copepod Pseudocalanus is found in two warm, semi-landlocked fiords in arctic Canada, together with a similar but smaller form attributable to the widespread P. minutus. The large form has the same chromosomne number as P. minutus, but has larger chromosomes and a higher nuclear DNA content. There are suggestions in the literature that other similar polytenic and cryptic species occur among copepods.