Three new species of Leptonema Guérin (Trichoptera: Hydropsychidae) from southeastern Brazil Author Jardim, Gabriela Abrantes Author Dumas, Leandro Lourenço Author Nessimian, Jorge Luiz text Zootaxa 2010 2654 52 60 journal article 10.5281/zenodo.198914 2390f470-cd6a-4129-b6f4-c67c36f0b9de 1175-5326 198914 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.