Two species of the genusoncaea (copepoda, poecilostomatoida, oncaeidae) from the east sea, Korea |
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| Authors: | Jin Hee Wi Hae -Lip Suh Han Soeb Yang Ho Young Soh |
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| Institution: | (1) Division of Marine Technology, Chonnam National University, 550-749 Yeosu, Korea;(2) Department of Oceanography, Chonnam National University, 500-757 Gwangju, Korea;(3) Department of Oceanography, Pukyong National University, 608-737 Busan, Korea |
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| Abstract: | Abstract
Oncaea venusta Philippi, 1843 has been known as having some different size groups, but recent genetic study for cyt b and ITS 1 (Elverset al. 2006) suggests that these size groups can be considered as different species. Of these size groups, the largestO. venusta Philippi and the smallestO. venella Farran, 1929 were first described in Korean waters. The latter is easily distinguishable from the former in the following
characteristics in addition to its small size: (1) length to width ratio of genital double somite of two genders smaller,
and (2) female second pediger bearing inconspicuous dorso-posterior swelling.Oncaea venusta andO. venella co-occur in Korean waters during spring to fall, but their occurrence patterns seasonally differ: the former shows higher
density in fall while the latter does in summer. |
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| Keywords: | Oncaeidae Oncaea venusta Oncaea venella microcopepods Korean waters |
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