Abstract
This study describes the morphology and arrangement of the cuticular structures of Hyalella castroi Gonzalez, Bond-Buckup & Araujo, 2006 and Hyalella pleoacuta Gonzalez, Bond-Buckup & Araujo, 2006, to identify specific characters that can be used in taxonomstudies of this genus. The entire cuticular surface of both species was examined by optical and scanning electron microscopy. The data obtained were compared with available information for other members of Peracarida, mainly Amphipoda and Isopoda. Five different types of cuticular structures, including 30 types of setae, four types of microtrichs, three types of pores, and some structures formed by setules and denticles were identified. The results were compared with other groups of gammarids, and peracarideans, such as Thermosbaenacea and Isopoda. The use of cuticular structures as a tool for taxonomic studies showed important results, not only at species level, but also at genus, and family levels.
Highlights
Bond-Buckup & Araujo, 2006 and Hyalella pleoacuta González, Bond-Buckup & Araujo, 2006, to identify specific characters that can be used in taxonomstudies of this genus
Many classification schemes for setae have been developed with the aim of facilitating the application of this knowledge in comparative studies, as exemples are those done with decapods by THOMAS (1970), FARMER (1974), DRACH & JACQUES
Eurydice pulchra Leach, 1815; OSHEL & STEELE (1988), who examined the setae of some gammaridean amphipods; and WAGNER
Summary
Bond-Buckup & Araujo, 2006 and Hyalella pleoacuta González, Bond-Buckup & Araujo, 2006, to identify specific characters that can be used in taxonomstudies of this genus. On the cuticular surface of H. castroi and H. pleoacuta, five categories of cuticular structures were found: setae, microtrichs, setules, pores, and denticles (Figs 1-4). With short slender setules arranged in two opposite Inner plate of maxilla 2 rows from distal half of shaft.
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