Oncaea media Giesbrecht 1891
Creators: name: Fuentes-Reinés, Juan M.
name: Suárez-Morales, Eduardo
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Poecilostomatoida
Oncaeidae
Oncaea
Oncaea media

description: <i>media</i> <b>Material examined.</b> Ten adult females, undissected, 2 dissected (UARC 285M). <b>Remarks.</b> The body is cyclopiform, robust, habitus as in Figure 6. Body length, excluding caudal setae = 532–588 µm, average: 562 µm (<i>n</i> = 10). This species was originally described by Heron and Bradford-Grieve (1995) from the Gulf of Naples and redescribed by Böttger-Schnack (2001) based on specimens from the Gulf of Naples, the Red Sea, and the Gulf of Aden. It can be found in the epimesopelagic layer (Böttger-Schnack 2001) and our data shows its occurrence in shallow littoral areas, as observed for <i>O. venusta</i>. The specimens from Colombia have the diagnostic features of <i>O. scottodicarloi</i> as described by Heron and Bradford-Grieve (1995) and Böttger-Schnack (2001). There are, however, some subtle differences in our speci- mens: 1) length/width ratio of genital double-somite is 1.5 in populations from the Red Sea and Gulf of Aden (Böttger-Schnack 2001, fig. 22A, C), 1.4 in those from the Gulf of Naples (Heron and Bradford-Grieve 1995, fig. 17K) and this ratio is somewhat smaller (1.27) in the Colombian specimens (Fig. 7); 2) the length ratio of the genital double-somite with respect to the rest of urosomites is 2.5 in Red Sea and Gulf of Aden specimens (Böttger-Schnack 2001, figs 22A,C), 2.3 (Gulf of Naples) (Heron and Bradford-Grieve 1995, fig. 17K), and 2.2 in the Colombian specimens (Fig. 7). Overall, these differ- ences are deemed to be intraspecific variations and thus expand the knowledge on the morphometric variability of this species. In the Americas, this species can be confused with <i>O. media</i> Giesbrecht, 1891 and <i>O. waldemari</i> Bersano &amp; Boxshall 1996 but they can be distinguished by several characters: 1) the length/ width ratio of the genital double-somite is about 1.27–1.50 in <i>O</i>. <i>scottodicarloi</i> (Heron and Bradford-Grieve 1995, fig. 17K; present data, Fig. 7), 1.7 in <i>O. waldemari</i> (Böttger-Schnack 2001, fig. 24C), and 1.9 in <i>O. media</i> (Heron and Bradford-Grieve 1995, fig. 16A; Böttger-Schnack 2001, fig. 15C), 2) the length ratio genital double-somite/ rest of urosomites is 2.2–2.5 in <i>O</i>. <i>scottodicarloi</i> (Heron and Bradford-Grieve 1995, fig. 17K; Böttger-Schnack 2001, fig. 22A, C; present data, Fig. 7), 1.9 in <i>O. waldemari</i> (Böttger-Schnack 2001, table 1), and 3.9 in <i>O. media</i> (Heron and Bradford-Grieve 1995, fig. 16A; Böttger-Schnack 2001, fig. 15A, C), 3) the shape and location of the sclerotization differs among these species, in <i>O. scottodicarloi</i>, it is a line connected to the genital aperture (Heron and Bradford-Grieve 1995, fig. 17K; Böttger-Schnack 2001, fig. 22 C; Wi et al. 2009, fig. 10A; present data, Fig. 8), whereas in both <i>O. media</i> and <i>O. waldemari</i> sclerotization is absent (Heron and Bradford-Grieve 1995, fig. 16A; Böttger-Schnack 2001, fig. 15C, Wi et al. 2009, figs 8A, 11A). <b>Distribution.</b> It has been recorded in the Indian, Atlantic, and Pacific Oceans (Heron and Bradford-Grieve 1995, Böttger-Schnack 2001). This is the first record of this species in Colombian waters and in the Caribbean. Family Lubbockiidae Huys &amp; Böttger-Schnack, 1997 Genus <i>Lubbockia</i> Claus, 1863
description: Published as part of <i>Juan M. Fuentes-Reinés &amp; Eduardo Suárez-Morales, 2017, New records of poecilostomatoid copepods (Crustacea) from a coastal system in the Colombian Caribbean with notes on morphology, pp. 513-523 in Check List 13 (5)</i> on pages 516-517, DOI: 10.15560/13.5.513, http://zenodo.org/record/998799
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