Rivudiva trichobasis, Lugo-Ortiz & McCafferty, 1998

Cruz, Paulo Vilela, Boldrini, Rafael, De Lima, Cláudia R. T. & Hamada, Neusa, 2022, It is a mess! How many species are in Rivudiva trichobasis Lugo- Ortiz & McCafferty, 1998 (Ephemeroptera: Baetidae)?, European Journal of Taxonomy 789 (1), pp. 153-191 : 157

trichobasis species group

Diagnosis

1) antennal scape and pedicel with long and robust setae ( Fig. 1A ); 2) trochanter with long and robust setae ( Fig. 2A, C ); 3) distal margin of labrum with two rows of setae, one robust (ventral surface) and one thin and bifid (dorsal surface) ( Fig. 1B ); 4) maxillary palp segment II with distal lobe ( Figs 1E , 8D–H ); 5) dorsal surface of glossa with inner arc close to inner margin, outer arc close to outer margin ( Figs 4H , 8K ); 6) hindwing pads absent; 7) combination of rows of setae on fore femora: dorsal and ventral margins with long pointed setae, anterior surface with one median row of blunt setae ( Figs 2A , 9A , 13A ); 8) anterior surface of hind femora with one transversal row of setae at base, with setae sockets not touching each other ( Figs 2C , 9C , 13C ); 9) abdominal sterna surface with robust, apically pointed setae ( Fig. 3B ).

Composition

Rivudiva trichobasis , R. amazona sp. nov., R. oxum sp. nov., R. uiara sp. nov., R. naia sp. nov., and R. sp. X.

Figures

Fig. 1. Rivudiva trichobasis Lugo-Ortiz & McCafferty, 1998, paratype (IBN slide #270). A. Scape and pedicel. B. Labrum (left v.v., right d.v.). C. Left mandible. D. Right mandible. E. Apex of maxilla (base was deformed in slide). F. Hypopharynx. G. Labium (left v.v., right d.v.). H. Shape of distal rows of setae of glossa. Not to scale.

Fig. 2. Rivudiva trichobasis Lugo-Ortiz & McCafferty, 1998, paratype (IBN slide #270). A. Foreleg (femur on anterior surface). B. Detail of fore claw. C. Posterior surface of forefemur. D. Hind leg. E. Posterior surface of hind femur. Not to scale.

Fig. 8. Rivudiva oxum sp. nov.A–D, I–K. Holotype (INPA). E–H. Paratypes (INPA). A. Labrum (left v.v., right d.v.). B. Left mandible. C. Right mandible. D. Maxilla. E–H. Variation of maxillar palp segment II (E–F is related to slide mounting). I. Hypopharynx. J. Labium (left v.v., right d.v.). K. Shape of distal rows of setae of glossa. Not to scale.

Fig. 4. Rivudiva amazona sp. nov., holotype (INPA). A. Labrum (left v.v., right d.v.). B. Left mandible. C. Right mandible.D. Left maxilla.E. Variation of maxillar palp segment II (right maxilla).F. Hypopharynx. G. Labium (left v.v., right d.v.). H. Shape of distal rows of setae of glossa. Not to scale.

Fig. 9. Rivudiva oxum sp. nov., holotype (INPA). A. Foreleg (femur on anterior surface). B. Details of fore claw.C. Posterior surface of forefemur.D. Hind leg (femur on anterior surface). E. Posterior surface of hind femur. Not to scale.

Fig. 13. Rivudiva uiara sp. nov., holotype (INPA). A. Foreleg (femur on anterior surface). B. Detail of fore claw.C. Posterior surface of forefemur.D. Hind leg (femur on anterior surface). E. Posterior surface of hind femur. Not to scale.

Fig. 3. Rivudiva trichobasis Lugo-Ortiz & McCafferty, 1998, paratype (IBN slide #270). A. Margin of tergum IV. B. Surface of sternum IV. C. Paraproct. D. Cercus. E. Paracercus. Not to scale.