Downeshelea marambaia, Santarém & Borkent & Spinelli & Felippe-Bauer, 2018

Santarém, Maria Clara Alves, Borkent, Art, Spinelli, Gustavo & Felippe-Bauer, Maria Luiza, 2018, New Neotropical species of Downeshelea Wirth and Grogan and redescription of D. multilineata (Lutz) (Diptera: Ceratopogonidae), Journal of Natural History (J. Nat. Hist.) 52 (9 - 10), pp. 509-540 : 535-536

Downeshelea marambaia sp. nov.

( Figures 7a–d , 9e–g , 10 )

Diagnosis

Male. The only species of Downeshelea in the Americas with the following combination of features: gonostylus 0.65–0.66 length of gonocoxite; parameres fused for 0.12 of total length; stem slightly curved, convergent distally, slightly enlarged apically, distal portion strongly curved ( Figure 9g ); aedeagus rectangular, basal arch shallow, extending to 0.17 of total length with two large elliptical sclerotised anteromesal areas ( Figure 9f ).

Female. Unknown.

Description

Male. Head. Eyes separated by a distance shorter than one ommatidia ( Figure 7c ); antennal ratio 1.00 (n = 1) ( Figure 7b ); palpal ratio 2.50 (n = 1) ( Figure 7c ).

Thorax. Brown, without definite pattern in slide-mounted specimens. Wing ( Figure 7a ) with greyish spot over CuA 2 reaching wing margin; 2 nd radial cell twice longer than 1 st; wing length 1.05 (n = 1) mm; breadth 0.37 (n = 1) mm; costal ratio 0.74 (n = 1). Halter knob brown, stem pale. Legs ( Figure 7d ) brown, hind femur darker apically, hind tibia with subbasal dark band. Fore-, hind tarsomere 1 with one basal, one apical spine; midtarsomere 1 with two basal, two apical, three other ventral spines; apical spines of tarsomeres 2–4 of fore-, mid-, hind legs: 2–2–3, 2–2–2, 1–1–1; fore tarsal ratio 2.25 (n = 1), mid tarsal ratio 2.52 (n = 1), hind tarsal ratio 2.24 (n = 1); claws 0.40 (n = 1) length of their respective tarsomere 5.

Abdomen. Dark brown. Terminalia ( Figure 9e ): tergite 9 with quadrate apex, apicolateral process elongate, slender, in bad condition in slide-mounted specimen (not illustrated); sternite 9 concave anteriorly, posterior margin in bad condition in slidemounted specimen (not illustrated). Gonocoxite 1.91–2.17 (2.04, n = 2) times longer than basal width; gonostylus delicate, 0.65–0.66 (0.65, n = 2) length of gonocoxite. Parameres ( Figure 9g ) 1.16–1.17 (1.16, n = 2) times longer than aedeagus, fused for 0.12 (n = 1) of total length; knob bulbous; stem nearly straight, convergent distally, slightly expanded apically, distal portion strongly curved, tapering to tip, 0.56 (n = 1) of total length. Aedeagus ( Figure 9f ) rectangular, enlarged distally, heavily sclerotised laterally, basal arch shallow, extending to 0.17 (n = 1) of total length with large elliptical sclerotised anteromesal areas reaching midlength of aedeagus; distal portion with deep mesal excavation terminating in two prominent sclerotised pointed serrate processes.

Female. Unknown.

Specimens examined

Holotype male adult, labeled ‘ Holotype Downeshelea marambaia Santarém, Borkent, Spinelli and Felippe-Bauer , BRAZIL, Rio de Janeiro, Itaguaí , 22 March 1990, FEEMA team col.’ ( CCER) . Paratype male labeled as holotype except Marambaia island , P . Armas, 29 October 1992, Quintelas col. (CCER).

Distribution and bionomics

This species is restricted to Rio de Janeiro ( Brazil) in coastal areas of the Itaguai municipality ( Figure 10 ).

Etymology

The name of this species refers to its distribution in Marambaia island, Rio de Janeiro, Brazil.

Figures

Figure 7. Downeshelea marambaia sp. nov., male (a–d). (a) wing; (b) antenna; (c) head, anterior view; (d) fore, mid, hind legs (left to right). Downeshelea moravia sp. nov., male (e–h). (e) wing; (f) head, anterior view; (g) palpus; (h) fore, mid, hind legs (left to right).

Figure 9. Downeshelea jarina sp. nov., (a) male terminalia with aedeagus; (b) parameres. Downeshelea litorale sp. nov., (c) male terminalia with aedeagus; (d) parameres. Downeshelea marambaia sp. nov., (e) male terminalia; (f) aedeagus; (g) parameres. Downeshelea moravia sp. nov., (h) male terminalia with aedeagus; (i) parameres.

Figure 10. Geographic distribution of species in the Downeshelea multilineata species group.