INVESTIGADORES
RODRIGUES CAPITULO Alberto
artículos
Título:
A new genus and species of Ingolfiellidae (Crustacea, Ingolfiellida) from the hyporheic zone in the Sierra de la Ventana, and its biogeographic relevance
Autor/es:
RODRIGUEZ, MARIANELA; ARMENDÁRIZ, L; RODRIGUES CAPÍTULO, A.
Revista:
ZOOTAXA
Editorial:
MAGNOLIA PRESS
Referencias:
Lugar: Auckland; Año: 2017 vol. 4290 p. 99 - 112
ISSN:
1175-5326
Resumen:
AbstractWith the purpose of collecting macroinvertebrates for benthic studies of hill streams of the Argentinean Pampean ecoregion, a sampling program was performed in contrastant climatic seasons during 2015. Areas of 30 x 30 cm were selected, from where rocks were removed manually; then placed in a tray with water and gently brushed in order to remove the attached organisms. The physicochemical parameters of the water were measured in situ. The specimens described in this paper were found only in May 2015 in a sector of the rithron of the VentanaStream located posterior to the upwelling of hiporheic water, 50 m upstream where the stream is covered by larger conglomerates. The specimens (5 females and 4 males) were measured and photographed, and some were dissected and mounted in euparal. Appendages of head, pereion and pleon were illustrated. The analysis of the examined material allowed to conclude that it constitutes a new taxon, Yacana ventania n. gen. n. sp., enlarging the distribution of the family Ingolfiellidae in South America. Characteristics: body long and thin; without eyes; short antennas; mandible with bipectinated setae on the outer lobe, vestigial mandible palp and serrated on one side, four digitiform mandible process decreasing in size and the last one toothed; labium present; gnathopodswith a notch on the inner side, proximal spine pedicellate, propodus with digital form at its distal end, and tiny spine and a large seta; pereiopods dissimilar, with seta and terminal claw; pereiopods 7 differ from the others in size, number and arrangement of their setae. Uropods 2 longer thanuropod1, uropod3 small and uniramous; sexual dimorphism denoted in pleopods and uropods2 because the females present more rows of setae than males. Sizes of specimens varied between 3- 8.8 mm. The cladistic analysis (TNT) demonstrates that Yacana ventania n. gen. n. sp is closely related to South African genera, its discovery gaining relevance on biogreographical aspects and providing new evidence to the Theory of Continental Drift. Type specimens are deposited in theCarcinology collection of the División Zoología Invertebrados, Museo de La Plata, Argentina.