Taxonomy of Oncaeidae (Copepoda, Poecilostomatoida) from the Red Sea. III. Morphology and phylogenetic position of Oncaea subtilis Giesbrecht, 1892

  • Ruth Böttger-Schnack
  • Rony Huys
Part of the Developments in Hydrobiology book series (DIHY, volume 156)


Both sexes of Oncaea subtilis Giesbrecht, 1892, a small oncaeid species commonly occurring in temperate and tropical regions, are redescribed on the basis of material from the Red Sea. It is placed in a new monotypic genus, Monothula, on the basis of the loss of the outer spine on the third segment of the endopod of legs 2–4, and the presence of a single dorsal egg-sac, which is attached medially to the genital double-somite. The latter character is unique among oncaeids. The geographical distribution of M. subtilis comb. nov. is reviewed, and additional taxonomic data based on material from the eastern Mediterranean, the Arabian Sea and the eastern Indian Ocean are presented. The phylogenetic relationships of M. subtilis within the Oncaeidae are discussed.

Key words

Copepoda Oncaeidae taxonomy Monothula gen. nov. phylogeny plankton 


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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Ruth Böttger-Schnack
    • 1
  • Rony Huys
    • 2
  1. 1.c/o Institut für Meereskunde an der Universität KielKielGermany
  2. 2.Department of ZoologyThe Natural History MuseumLondonUK

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