Xenelmis granatoides, Sampaio, Brunno Henrique Lanzellotti, Passos, Maria Inês Da Silva Dos & Ferreira-Jr, Nelson, 2015

Sampaio, Brunno Henrique Lanzellotti, Passos, Maria Inês Da Silva Dos & Ferreira-Jr, Nelson, 2015, New species and new records of Xenelmis Hinton (Coleoptera: Elmidae) from Southeastern Brazil, Zootaxa 3936 (1), pp. 115-122 : 117-119

Xenelmis granatoides sp. nov.

( Fig. 2 a–c)

Diagnosis. This species is distinguished by the combination of three characteristics: (1) pronotum with a pair of median carina, (2) third interval of elytra with a short row of granules, (3) male genitalia with median lobe longer than parameres, apex arrow tip-like, slightly concave apically; parameres wide at base, narrowing toward outward projected apices.

Description. Holotype male: total length 1.64 mm; head greatest width 0.34 mm, length 0.19 mm; pronotum greatest width 0.63 mm, length 0.50 mm; elytra greatest width 0.84 mm, length 0.95 mm. Body black, appendages light brown.

Head: surface micropunctuated between the eyes; anterior margin of labrum feebly sinuate, with small seta all over the margin; clypeus with small, fine, and sparse seta, anterior margin inconspicuously arcuate; antennae filiform, inserted near dorsal margin of eyes, eleven-segmented, last antennomere fusiform, longer than segments IX–X together; eyes ovate; dorsal margin straight; anterior, ventral, and posterior margin rounded.

Pronotum with anterior margin sinuate, strongly convex medially, lateral margin crenate and arcuate, posterior margin three-arcuate; one concavity in each side of median concavity in front of scutellum. Surface opaque, with feeble iridescence and sparse recumbent setae; disc with pair of longitudinal, slightly sinuate carinae, made of row of oblong and flattened granules, beginning on projections on posterior margin, extending up to anterior 1/5; sublateral carinae, on posterior 1/5, very short, made by row of granules.

Elytra shining with anterior margin sinuate, humerus feebly acute, lateral margin crenate, apices projected and rounded; six striae on disc, plus one sublateral; stria made by row of punctures bigger than facet of eyes, separated by less than once its own diameter; elytral intervals with sparse setae, mainly on posterior third; third interval with short carina, as long as three times scutellum length, made by row of granules; fifth and seventh intervals carinate, inner carina longer than outer. Scutellum slightly longer than wide, anterior margin strongly arcuate, lateral margin converging to apex; epipleura tomentose with few sparse granules, broad up to apices projection.

Prosternum as long as wide, with granulose and setose surface; prosternal process wide with broad, feebly rounded apex. Hypomeron tomentose with granules smaller than facet of eyes, separated by more than twice its diameter. Mesosternum with wide groove to receive the prosternal process. Metasternum with sparse granules and setae; median smooth impression more conspicuous on posterior 3/5.

Legs: coxa, trochanters and femora with fine and sparse setae; fore tibia with a fringe of tomentum in apical third of anterior face; median tibia with two fringes of tomentum—one in distal third on anterior face, second in distal half on posterior face; hind tibia with fringe of tomentum on apical 2/3 on posterior face; tarsomeres 1–4 with few seta on ventral face, apical tarsomere with dorsal pair of seta, near claws.

Abdomen tomentose, with granules and seta similar to those of metasternum; last ventrite with sparse, fine and small seta all over the surface and near strongly convex posterior margin.

Male genitalia moderately long and wide. Median lobe much longer than parameres; arrow tip-like apex, slightly concave apically; basolateral apophyses very long (approximately 2/3 of phallobase length). Parameres wide at base, narrowing distally, with apices projected outward. Phallobase twice as long as wide.

Variation. Female externally similar to male. Total body length varies between 1.53–1.68 mm; head width 0.33–0.35 mm; pronotum width 0.53–0.63 mm and length 0.44–0.51 mm; elytra width 0.76–0.84 and length 0.88–0.95 mm.

Comparative notes. Xenelmis granatoides sp. nov., like X. micros , bears a single pair of longitudinal row of granules on pronotum, but the new species has a short row of granules on the third interestrial interval; the last characteristic is absent in X. micros ( Hinton 1946) . The male genitalia of Xenelmis granatoides sp. nov. resembles that of X. granata , but the pair of sublateral carina on pronotum—characteristic of X. granata group—is absent in new species. With this set of characteristics it is not possible to place the new species in any of species groups.

Type material: Holotype. Male. Brazil, Rio de Janeiro, Nova Friburgo municipality, Rio Bonito de Lumiar, afluente de 3ª ordem do Rio Bonito, casa do Sr. Caizé—RB21, 22 º24'15,3"S 42º26'46,2"W, 863m, 03-IV- 2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, L.L. Dumas leg. [ DZRJ Coleoptera-5626]; 1 specimen—Rio Bonito de Lumiar, Córrego dos Patos, 22º24'45,5"S 42º19'10,6"W, 670m, 05- III-2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, A.L.H. Oliveira leg. [ DZRJ Coleoptera-5627]; 1 specimen—Rio Bonito de Lumiar, afluente de 1ª ordem do Rio Toca da Onça—RB03, 22º23'23,7"S 42º20'04,8"W, 716m, 05-III-2009, B.H.L. Sampaio, A.L.H. Oliveira leg. [ DZRJ Coleoptera-5628]; 1 specimen—Rio Bonito de Lumiar, Rio Bonito- Estrada Galdinópolis-Lumiar, Ponte—RB12, 22 º24'46,5"S 42º24'13,3"W, 786m, 07-III-2009, G.A. Jardim, B.H.L. Sampaio, A.L.H. Oliveira leg. [ DZRJ Coleoptera-5629]; 1 specimen—Rio Bonito de Lumiar, Córrego do Sertão—RB22, 22 º24'54,7"S 42º25'22,3"W, 810m, 03-IV-2009 J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, L.L. Dumas leg. [ DZRJ Coleoptera-5630]; 1 specimen— Macaé municipality, Sana, Rio Peito do Pombo, Cachoeira do Escorrega—SA03, 22º19'2,81"S 42º11'9,47"W, 17-II-2009, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, L.L. Dumas leg. [ DZRJ Coleoptera- 5631]; 1 specimen—Sana, Rio Sana—SA07, 22º14'42,3"S 42º09'03,2"W, 567m, 18-II-2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, L.L. Dumas leg. [ DZRJ Coleoptera-5632]; 1 specimen—Frade, Rio São Pedro (Córrego da Sibéria)—SP03, 22º13'45,1"S 42º07'39,6"W, 426m, 20-iii-2009, J.L. Nessimian, G.A. Jardim, I.C. Gonçalves, B.H.L. Sampaio, V.P. Alecrim, G. Lefebvre leg. [ DZRJ Coleoptera-5633].

Etymology. This species is named in reference to the resemblance of its male genitalia to the male genitalia of Xenelmis granata . The suffix oides indicates resemblance.

Figures

FIGURE 2. Xenelmis granatoides sp. nov.: a) habitus dorsal view; b) habitus ventral view; c) male genitalia, dorsal view.