Leptonema serratum, 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 : 57-58

Leptonema serratum sp. nov.

Figs. 17–22

Leptonema serratum sp. nov. is a member of the L. speciosum Group, as defined by Flint et al. (1987). It is closely related to L. stigmaticum Navás , sharing similarities in general structure of the phallus, mainly in processes d, g¸ and complex b-c. This new species differs from L. stigmaticum by having the basal branch of process d longer and serrate apically, and process g bifid at apex. Furthermore, the new species has the dorsal margin of complex b -c serrate mesally, while L. stigmaticum has only a few spines on this margin.

Description. Adult male ( Figs. 17–22 ): Length of forewing: 14.0– 15.5 mm (n=5). Head, antennae, maxillary palps and legs stramineous in alcohol. Wings light brown, without maculae. Malar space narrow, about 1/5 height of eye. Frontal setal wart very large, 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 on postgenal area with 6 stout long dark setae and several small ones. Vertex area between posterior warts with 1 pair of small, narrow elevations, with a longitudinal mesal shallow depression (probably corresponding to reduced ocelar setal warts). Maxillary palps 5-segmented, long, setose; segment III about 2/3 length of segment II; segment V extremely long, about the length of all other segments together ( Fig. 17 ). Tibial spur formula 2-4-4. Abdominal sternum II with short mesal suture; sternum V with pair of semicircular processes ( Fig. 18 ).

Male genitalia ( Figs. 19–22 ): Segment IX short in lateral view ( Fig. 19 ); in dorsal view with narrow Vshaped keel ( Fig. 20 ). Segment X with wart a large, oval; warts b and c absent; lateral lobes, in dorsal view, slightly expanded, each with small setal area laterally, apex rounded, bearing short setae; mesal lobes reduced ( Figs. 19, 20 ). Inferior appendages 2-segmented, basal segment longer than apical segment, each basal segment with dorsal tuft of long setae on distal portion; apical segments nearly 2/5 length of basal segments, with short spinulous setae on inner margins ( Fig. 21 ). Phallus tubular, with phallobase short, broad and with pointed apex ( Fig. 19 ); processes g well developed, tapering apically, bifid at apices ( Fig. 22 ); processes b and c fused to form complex pointed apically, slightly upturned, dorsal margin serrate mesally; process d well developed, broad at base, with small basal branch turned caudad and long branch serrate apically; processes e and f absent; mesal lobe beneath process a with several minute spines and serrate, pointed projection. Phallotremal sclerite indistinct.

Female: Unknown.

Holotype male: BRAZIL, Rio de Janeiro state, 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. ( DZRJ 2359)

Paratypes: Brazil, Rio de Janeiro state, 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., 1 male ( MZSP); Crubixais de Cima, Rio Crubixais, 22º11’38.1”S, 42º04’26.1”W, 523 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 2360); Frade, Rio São Pedro (Córrego da Sibéria), 22º13’45.1”S, 42º07’39.6”W, 426 m, 20.iii.2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, G. Lefebvre leg., 3 males ( DZRJ 2361, 2362); Sana, 1st order tributary of Rio Sana, 22º19’58.0”S, 42º10’20.4”W, 419 m, 17.ii.2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, L.L. Dumas leg., 1 male ( DZRJ 2363); Nova Friburgo municipality, Cascata, 2nd order stream 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., 1 male ( DZRJ 2364); Lumiar, 1st order tributary of Rio Macaé, 22º21’05.6”S, 42º22’31.6”W, 760 m, 04.iv.2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, L.L. Dumas leg., 1 male ( DZRJ 2365); Lumiar, 1st order tributary of Córrego Santa Margarida, 22º20’35.5”S, 42º18’00.0”W, 844 m, 16.xi.2008, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, M.R. de Souza leg., 2 males ( DZRJ 2366); Rio Bonito de Lumiar, Córrego das Paineiras, 22º23’27.2”S, 42º20’03.6”W, 694 m, 25.v.2008, J.L. Nessimian, N. Ferreira Jr., L.L. Dumas, A.P.M. Santos leg., 1 male ( DZRJ 2367); Rio Bonito de Lumiar, Fazenda Abaetetuba, Córrego das Paineiras, 22º23’27.2”S, 42º20’03.6”W, 694 m, 25.v.2008, J.L. Nessimian, N. Ferreira Jr., L.L. Dumas, A.P.M. Santos leg., 1 male ( DZRJ 2368).

Etymology. This species is named serratum in reference to the serrate dorsal margin of process g of the phallus. It is derived from the Latin word serra, that means serrate, or toothed like a saw.

Figures

FIGURES 17 – 22. Leptonema serratum sp. nov., male. 17. Right maxillary palp, right lateral view; 18. abdominal sternum V, ventral view with posterior margin at top of drawing; 19. genitalia, left lateral view; 20. genitalia, dorsal view; 21. genitalia, ventral view; 22. phallus, left lateral view.