Apobaetis fiuzai Salles & Lugo­Ortiz, 2002

Salles, F. F. & Lugo-Ortiz, C. R., 2002, A distinctive new species of Apobaetis (Ephemeroptera: Baetidae) from Mato Grosso and Minas Gerais, Brazil, Zootaxa 35, pp. 1-6 : 2-5

Apobaetis fiuzai Salles & Lugo­Ortiz , sp. n.

Larvae. Body length: 3.5­4.8 mm. Caudal filaments length: 1.8­2.2 mm.

Head ( Fig. 1 ) cream, with medium to dark brown markings. Lateral ocelli medium brown, medial ocellus dark brown. Compound eyes black, protruding; turbinate portion yellow, with brown borders. Frontal keel absent. Labrum ( Figs. 2, 3 ) without anteromedial excavation; anterior margin with row of long, robust, simple, pointed setae, progressively diminishing in length and disappearing towards midregion; dorsal surface convered with short, fine and long, fine simple setae. Hypopharynx as in Figure 4 . Left mandible ( Figs. 5, 6 ) with basally cleft incisors; outer and inner incisors respectively with four and three denticles; protheca robust, bifid, both prongs apically pointed, with minute setae medially; triangular process at base of mola well developed, with small denticles near base of mola. Right mandible ( Figs. 7, 8 ) with incisors basally cleft; outer and inner incisors respectively with three and two denticles; prostheca single, elongate and robust; triangular process at base of mola poorly developed; robust, apically rounded process in midregion of mola. Maxillae ( Figs. 9, 10 ) with four falcate denticles and row of approximately eight long, robust, pointed, simple setae on apex of galealaciniae; apical half of medial margin with approximately six pointed setae of different lengths; palps three­segmented; segment 1 short; segment 3 narrow, nearly 1.3x length of segment 2, sparcely covered with long, fine, simple setae marginally. Labium ( Fig. 11 ) with palp segment 1 approximately 0.80x length of segments 2 and 3 combined, with sparse long, fine, simple setae; segment 2 with acute distomedial process, basally broad, covered with fine, simple setae of various lengths, and with dorsal row of three long, robust, simple, pointed setae; segment 3 narrow, apically truncate, covered with long, robust, pointed, simple setae; outer margin of segments 3 and apical 3/4 of outer margin of segment 2 densely covered with long, fine, simple setae; paraglossae narrower than glossae, apically narrow, outer margin and mediodorsal and ventral surfaces respectively with one row of long, robust, pointed setae; glossae dorsally with row of short, robust, pointed, simple setae on outer margin, slightly increasing in length towards apex, ventrally with short, fine, simple setae.

Thorax cream, with medium and dark brown markings, without distinct pattern. Hindwing pads absent. Legs ( Fig. 12 ) pale cream, long and narrow; femur anteriorly with round pale brown marking; femur, tibia, and tarsi without markings, ventrally with robust, pointed setae of various lengths, dorsally with sparse short, fine, simple setae; foretarsal claws nearly 0.65x length of foretarsi.

Abdomen ( Fig. 13 ) cream, with complex medium and dark brown markings. Terga ( Fig. 14 ) densely covered with minute spines, posteriorly with uniform sharp spines. Gills ( Fig. 15 ) narrow­elongate, with conspicuous tracheation, reaching or extending beyond third subsequent tergum. Paraproct ( Fig. 16 ) covered with minute spines and with few long, fine, simple setae, marginally with 16 spines, progressively increasing in size towards apex. Caudal filaments cream in basal half and medium brown in apical half, apical half with one cream segment every three brown segments.

Adults. Unknown.

Type material. Holotype: Female larva, Brazil, Minas Gerais, Córrego Danta, Fazenda Prata, Rio da Prata, 19o 45.29'S / 46o 5.53'W, small stones near river margin, slow current, shallow, 9/VIII/2001, C. R. Lugo­Ortiz and F. F. Salles. Paratypes: Nine larvae, same data as holotype. All types are housed in the Laboratório de Entomologia da Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.

Additional material: Larva, Brazil, Minas Gerais, Arinos, Mont Serrat, Rio Paraibúna, sand, 28/VI/2000, N. Ferreira, Jr.; larva, Brazil, Minas Gerais, Descoberto, Cachoeira da Fumaça, marginal vegetation, 2/VIII/1997, C. N. Francischetti; larva, Brazil, Mato Grosso, Chapada dos Guimarães, Cachoeira do Pulo, 21/II/2000, C. N. Francischetti and M. S.

Baptista. All specimens are housed in the Laboratório de Entomologia da Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.

Etymology. We are honored in naming this species after Paulo Sérgio Fiuza Ferreira, for his considerable help during one of the collecting trips and for his contributions to the field of entomology in Brazil.

Figures

FIGURES 1 ­ 11. Apobaetis fiuzai, sp. n., larva. 1. Head (frontal). 2. Labrum (dorsal). 3. Labrum (dorsal ­ detail of anterior margin). 4. Hypopharynx. 5. Left mandible. 6. Left mandible (detail of incisors and triangular process). 7. Right mandible. 8. Right mandible (detail incisors). 9. Maxilla. 10. Maxilla (detail of galealacinia). 11. Labium (left­ventral; right­dorsal).

FIGURES 12 ­ 16. Apobaetis fiuzai, sp. n., larva. 12. Foreleg. 13. Abdominal color pattern. 14. Tergum 4 (detail of posterior margin). 15. Gill 4. 16. Paraproct.