On the diphyletic origin of the Oncaeidae Giesbrecht, 1892 (Copepoda: Poecilostomatoida) with a phylogenetic analysis of the Lubbockiidae fam. nov.
Huys, R.; Böttger-Schnack, R. (1997). On the diphyletic origin of the Oncaeidae Giesbrecht, 1892 (Copepoda: Poecilostomatoida) with a phylogenetic analysis of the Lubbockiidae fam. nov. Zool. Anz. 235: 243-261
The monophyly of the Oncaeidae was tested using cladistic methodology. The family (as it is currently recognised) comprises two distinct lineages that do not share a sistergroup relationship and have colonized the open pelagic environment independently. Under the revised family concept the Oncaeidae encompasses only the genera Conaea Giesbrecht, Epicalymma Heron and the type-genus Oncaea Philippi which is regarded as a paraphyletic (or possibly polyphyletic) taxon. A new family Lubbockiidae is proposed to accommodate Lubbockia Claus, Pseudo-lubbockia Sars and Laitmatobius Humes. The taxonomic position of Oncaeola Kramer and Limnoncaea Kokubo is briefly discussed. The major morphological trends within the Lubbockiidae are summarized and serve as the basis for a computer-assisted analysis of the phylogenetic relationships between the 13 species. As a result Lubbockia is subdivided into five genera and is redefined to include only L. squillimana Claus, L. aculeata Giesbrecht, L. wilsonae Heron & Damkaer and L. extenuata Boxshall. The four new genera Haplopodia, Homeognathia, Rhamphochela and Atrophia are described largely on the basis of different types of sexual dimorphism, leg 5 morphology and antennulary aesthetasc patterns. The phylogenetic position of both the Oncaeidae and Lubbockiidae in the order Poecilostomatoida is briefly discussed.
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