First account of echinoderid kinorhynchs from Brazil, with the description of three new species
- PDF / 3,438,103 Bytes
- 24 Pages / 595.276 x 790.866 pts Page_size
- 108 Downloads / 216 Views
DIVERSITY OF MARINE MEIOFAUNA ON THE COAST OF BRAZIL
First account of echinoderid kinorhynchs from Brazil, with the description of three new species Martin V. Sørensen
Received: 10 July 2013 / Revised: 16 August 2013 / Accepted: 20 August 2013 # Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg 2013
Abstract As an outcome of the workshop “Taxonomy and Diversity of Marine Meiofauna”, arranged by CEBIMar in São Sebastião, Brazil, the three first Brazilian species of the kinorhynch genus Echinoderes are described. Echinoderes ajax sp. nov. is a subtidal species characterized by four pairs of tubes on segment 2, one pair of tubes in lateroventral position on segment 5, and one pair in laterodorsal position on segment 10. A minute spine is present in middorsal position of segment 4 only, and there are lateroventral spines on segments 6–8. The new species shows most resemblance to E. cantabricus, E. capitatus, and E. isabelae. The second species, E. marthae sp. nov. is intertidal and has no spines, besides the lateral terminal ones. Tubes are present in lateroventral positions on segments 5 and 8, in laterodorsal positions on segment 8, and in subdorsal positions on segment 10, but the latter only in males. The enlarged sieve plates and lack of lateral terminal accessory spines in females clearly places the new species inside the Echinoderes coulli species group. The third new species, Echinoderes astridae sp. nov., is subtidal, and characterized by middorsal spines on segments 4 and 6, ventrolateral tubes on segment 2, lateroventral tubes/ spines on segments 5–9, and sublateral tubes on segment 8. In addition, the species has very conspicuous glandular cell outlets of type 2 in subdorsal and sublateral positions of segment 2. The species shows very close resemblance to E. bispinosus , and the two species are basically only distinguished by the sublateral tubes on segment 8, present only in the new species. The close resemblance prompted a reexamination of the type series of E. bispinosus, and light microscopical documentation for this species is presented for the first time. M. V. Sørensen (*) Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark e-mail: [email protected]
Keywords Echinoderidae . Echinoderes . Kinorhyncha . Meiofauna . São Sebastião . Taxonomy
Introduction Considering its magnificent coast line, surprisingly little is known about the kinorhynch fauna of Brazil. The occurrence of kinorhynchs at various Brazilian localities has been confirmed in several contributions (e.g., Gomes et al. 2002; Vasconcelos et al. 2004; de Paula et al. 2006; Santos et al. 2009; Sørensen 2011), but most of these studies have an ecological approach, and any identification further than phylum level is rarely attempted. Hence, it appears almost ironical that the only taxonomic contributions dealing with the Brazilian kinorhynch fauna actually describe two of the most peculiar taxa, namely the aberrant genera Cateria Gerlach, 1956 and F
Data Loading...
