Sympatric size variants of the microcopepod Oncaea venusta exhibit distinct lineages in DNA sequences

Two species of the genusoncaea (copepoda, poecilostomatoida, oncaeidae) from the east sea, Korea

“…The same characters are seen in specimens from Korean waters, indicating these speciemens are O. venella. Recently Elvers et al (2006) showed that the smallest one of different size-groups of Oncaea venusta from the Indo-West Pacific (Böttger-Schnack 2001) was genetically a distinct species and others also might be genetically different. However, the smallest specimens analyzed by Elvers et al (2006) somewhat differ from O. venella Farran, 1929 from the Northeastern Pacific in its size range and morphological characters.…”

“…The prosomes of both genders are more corpulent than O. venella. Elvers et al (2006) indicate that the large species O. venusta is a distinct clade or lineage by phylogenetic analysis obtained from sequences data of two DNA markers (cyt b and ITS1). Oncaea praecalara expressed by Humes (1988) represented main characters as O. venusta, and then Böttger-Schnack reexamined the specimens from the National Museum of Natural History, Smithsonian Institute, and confirmed them as O. venusta.…”

“…Heron (2002) discovered three sizegroups in the Atlantic and the North West Pacific Ocean and of them the smallest species was raised to species level as O. venella Farran, 1929. Moreover, recent genetic study (Elvers et al 2006) shows that size groups of O. venusta can be genetically distinct different species. We also discovered three size-groups in the East Sea and the South Sea of Korea, and of them first described the largest one, O. venusta and the smallest one, O. venella in Korean waters.…”

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Abstract − Oncaea venusta Philippi, 1843 has been known as having some different size groups, but recent genetic study for cyt b and ITS 1 (Elvers et al 2006) suggests that these size groups can be considered as different species. Of these size groups, the largest O. venusta Philippi and the smallest O. venella Farran, 1929 were first described in Korean waters.

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New records of poecilostomatoid copepods (Crustacea) from a coastal system in the Colombian Caribbean with notes on morphology

“…Based on its size range the species has been categorized into 3 groups (Böttger-Schnack 2001, Böttger-Schnack and Huys 2004). Molecular studies using of 2 DNA markers (cyt b and ITS1) could differentiate 4 genetic clades where the small and large size groups were separated genetically and both could be deemed as distinct species (see Elvers et al 2006, fig. 2, table 4).…”