Leptonema ferelunatum, Jardim, Gabriela Abrantes, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2010

Jardim, Gabriela Abrantes, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2010, Three new species of Leptonema Guérin (Trichoptera: Hydropsychidae) from southeastern Brazil, Zootaxa 2654, pp. 52-60 : 53-55

Leptonema ferelunatum sp. nov.

Figs. 1–7

Leptonema ferelunatum is a member of the L. crassum Group, as defined by Flint et al. (1987), although it has the median suture of the basal abdominal sternum. The new species, like others in the L. crassum Group, lacks the usual processes of the phallus. This new species is very similar to L. lunatum Flint, McAlpine & Ross , to which it is closely related, sharing the large, broadly rounded, lateral lobes of tergum X, and the apicodorsal lobes of the phallus. Furthermore, the processes of sternum V are long, narrow, and crescentic in both species. In L. lunatum , tergum X has a lateral projection on the inner margins of the lateral lobes, projections which are absent in the new species. Apicodorsal lobes of the phallus in the new species are longer and curved over the stem of the phallus, while in L. lunatum they are upturned, but not curved.

Description. Adult male ( Figs. 1–7 ): Length of forewing: 19.0–22.0 mm (n=5). Head, antennae, maxillary palps and legs stramineous in alcohol. Wings light brown, without maculae. Malar space about 1/3 height of eye. Frontal setal wart between antennal bases; 1 pair of small antennal setal warts not clearly delimited; 1 pair of large, subtriangular posterior setal warts behind eyes; 1 pair of slender setal warts, bearing long dark setae on postgenal area. Vertex area between posterior warts with 1 pair of knobs (probably corresponding to reduced ocelar setal warts). Maxillary palps 5-segmented, long, setose; segment III about 2/ 3 length of segment II; segment V long, about half length of all other segments together ( Fig. 1 ). Tibial spur formula 2-4-4. Abdominal segments II-VIII each with pair of vestigial larval branched gills ventrolaterally on posterior margin. Sternum II with mesal suture; sternum V with pair of oblique, falciform, slender processes with posterior ends close to meson ( Fig. 2 ).

Male genitalia ( Figs. 3–7 ): Segment IX short in lateral view ( Fig. 3 ); in dorsal view with large V-shaped keel ( Fig. 4 ). Segment X with wart a slightly produced; warts b and c absent; lateral lobes large, rounded apically, with dorsal surfaces slightly concave, each with large setiferal lobe; ventral surface of tergum X slightly sclerotized, shallowly notched at apex; mesal lobes reduced ( Figs. 3, 4 ). Inferior appendages 2- segmented, basal segments longer than apical segments, each basal segment with dorsal tuft of long setae on distal portion; apical segments nearly 1/4 length of basal segments, with short spinulous setae on inner margins ( Fig. 5 ). Phallus tubular, with phallobase short ( Fig. 3 ); apex without any processes, bearing pair of large, rounded dorsolateral lobes ( Figs. 6, 7 ).

Female: Unknown.

Holotype male: BRAZIL, Rio de Janeiro state, Nova Friburgo municipality: Lumiar, Córrego Boa Vista, Cachoeira Indiana Jones, 22°19’02.1”S, 42º17’28.5”W, 900 m, 14.xi.2008, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, M.R. de Souza leg. ( DZRJ 2349).

Paratypes: BRAZIL, Rio de Janeiro state, Nova Friburgo municipality: Cascata, 2nd order tributary of Rio Macaé on Lumiar-Sana road, 22º23’15.0”S, 42º16’16.3”W, 600 m, 08.iii.2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, A.L.H. Oliveira leg., 2 males ( DZRJ 2350); same data, 1 male ( MZSP); Lumiar, Córrego Boa Vista, Cachoeira Indiana Jones, 22°19’02.1”S, 42º17’28.5”W, 900 m, 14.xi.2008, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, M.R. de Souza leg., 1 male ( DZRJ 2351); Rio Bonito de Lumiar, Ramalhete, Rio Bonito, 22º24’38.5”S, 42º20’40.7”W, 656 m, 06.iii.2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, A.L.H. Oliveira leg., 1 male ( DZRJ 2352); Macaé municipality: Crubixais de Cima, 1st order tributary of Rio Crubixais, 22º11’38.4”S, 42º04’46.1”W, 576 m, 21.iii.2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V. P. Alecrim, G. Lefebvre leg., 2 males ( DZRJ 2353); Mangaratiba municipality: Reserva Ecológica Rio das Pedras, Rio Grande, 22º59’31.2”S, 44º06’18.0”W, 42 m, 06.v.2007, A.P.M. Santos leg., 1 male ( DZRJ 2354); same locality, 23.v.2009, D.M. Takiya, R.S. Carrijo leg., 1 male ( DZRJ 2355).

Etymology. This species is named ferelunatum in reference to its close similarity to L. lunatum . The Latin prefix fere means almost, or nearly.

Figures

FIGURES 1 – 7. Leptonema ferelunatum sp. nov., male. 1. Right maxillary palp, right lateral view; 2. abdominal sternum V, ventral view with posterior margin at top of drawing; 3. genitalia, left lateral view; 4. genitalia, dorsal view; 5. genitalia, ventral view; 6. phallus, dorsal view; 7. phallus, left lateral view.