Pseudomicrocara angusta, Libonatti, María Laura & Ruta, Rafał, 2013

Libonatti, María Laura & Ruta, Rafał, 2013, Review of the Argentinean species of Pseudomicrocara Armstrong (Coleoptera: Scirtidae), Zootaxa 3718 (2), pp. 137-157 : 169-175

Pseudomicrocara angusta sp. nov.

( Figs. 1 , 9, 10 , 27 , 34, 35 , 47 , 59 , 60–65 )

Type material. Holotype, female (MLP): Parque Nacional Nahuel Huapi, Río Manso inferior, Arroyo Las Vertientes, 10.xi–1.xii.2008, Malaise, leg. Analía Garré & Fernanda Montes de Oca.

Paratypes. 1 ex. (MLP, male): same data as holotype. 2 exx. (NHM, male & female): Parque Nacional Nahuel Huapi, Arroyo Grande, 41° 02’ 21.6” S 71° 48’ 27” W, 763 m, 4–25.ii.2007, Malaise, leg. Analía Garré & Fernanda Montes de Oca. 1 ex. (NHM): El Bolsón, 4.xi.1960, A. Kovacs. 1 ex. (NHM): El Bolsón, 17.x.1961, A. Kovacs. 2 exx. (NHM): El Bolsón, 20.x.1961, A. Kovacs. 1 ex. (NHM): El Bolsón, 4.xi.1961, A. Kovacs. 1 ex. (NHM): El Bolsón, 21.ix.1962, A. Kovacs. 2 exx. (NHM): El Bolsón, 29.x.1962, A. Kovacs. 6 exx. (NHM): El Bolsón, 4.xi.1962, A. Kovacs. 7 exx. (NHM): El Bolsón, 24.xi.1962, A. Kovacs. 1 ex. (NHM): El Bolsón, 28.xi.1962, A. Kovacs. 3 exx. (NHM): El Bolsón, 3.xii.1962, A. Kovacs. 1 ex. (NHM): Lago Puelo, 8.ii.1961. A. Kovacs.

Description. Habitus. Elongate, relatively narrow, elytral lateral margins subparallel, maximum width just behind middle, TL/EW: 2.17, EL/PL: 4.40.

Head 1.6 times as wide as interocular space; dark brown, with a testaceous area around the eye contiguous to a testaceous area around the antennal insertion; a pair of rounded foveae between eyes and a transversely elongate fovea behind it; clypeus 3 times as wide as long, 1.25 times as wide as labrum, clypeal margin straight. Punctation granulate, fine, punctures separated by a single diameter. Head covered with yellowish setae. Labrum 2.0 times as wide as long, margins rounded, brown. Antennae filiform, brown, apices of segments 4–10 testaceous, approximate ratio of antennal segments: 1.75: 1.0: 1.25: 3.0: 2.75: 2.75: 2.75: 2.75: 2.5: 2.75: 2.75, L/W ratios of antennal segments: 1.4, 1.3, 1.7, 4.0, 3.7, 3.7, 4.4, 5.5, 5.0, 5.5, 5.5. Segment 1 barrel-shaped, outer margin straight, inner margin curved; segment 2 barrel-shaped; segment 3 subconical; segments 4–11 subcylindrical, slightly widened to the apex; segment 4 2.4 times as long as segment 3. Mandibles symmetrical, lacking teeth, incisivus well developed, molar region with spines, brown, apex testaceous. Maxillary palpi elongate, brown, apices of segments testaceous.

Thorax. Pronotum 1.73 times as wide as long, trapezoidal, anterolateral angles rounded, maximum width at the base, yellow with an irregular brown central macula. Punctation coarser than that on head, punctures separated by a single diameter. Pronotum completely covered with yellowish setae. Hypomeron yellow, outer branch of carina reaching front edge of procoxal cavity. Scutellum equilaterally triangular, apex pointed, brownish yellow. Ventral side of thorax, elytral epipleura and legs dark brown. Prosternal process elongate, very thin, somewhat widened at the tip. Mesoventrite with a groove-shaped fossa for the reception of prosternal process. Mesoventral process elongate, thin, separating middle coxae, apex simple, rounded. Elytra dark brown, completely covered with relatively long yellowish setae, punctation coarser than that on head, pronotum and scutellum, punctures separated by 0.5–1.0 diameter, sometimes forming transverse lines. Each elytron with three slightly marked costulae.

Abdomen testaceous or brownish testaceous with brown maculae: ventrite 1 with one macula on each side, ventrites 2–4 each with one macula on each side and one central pair of maculae, ventrite 5 with one central pair of maculae. Ventrites completely covered with short yellowish setae. Apex of ventrite 5 truncate.

Male terminalia. Tergite 8 with a pair of subparallel sclerotized apodemes, without sclerotized cross-piece, posterior margin rounded, with setae. Tergite 9 with a pair of sclerotized apodemes converging posteriorly up to a lightly sclerotized cross-piece and then diverging posteriorly, posterior margin rounded, without setae. Sternite 8 Vshaped, anterior sclerotized region with a lightly sclerotized rounded area, anterior margin rounded, posterior apices with setae. Sternite 9 slightly bilobed, with a pair of sclerotized apodemes widening posteriorly, posterior margin with setae.

Male genitalia. Tegmen with basal margin emarginate, parameres broad at base, narrowing posteriorly, external margins straight, apex acute, styli present. Penis with lateral margins of basal piece converging posteriorly, basal margin rounded, trigonium triangular with apex truncate, slightly curved ventrally, parameroids with a notch on the external margin, apex acute, pointing outwards.

Female genitalia. Prehensor composed of two symmetrical sclerites, each with a row of spines on the external margin. Bursella with pores producing into conical structures, each one with several distal spines.

Sexual dimorphism. Female with a rounded patch of setae on ventrite 4.

Variation. One specimen with apical third of elytra dark brown, rest of elytra yellowish.

Measurements. Males (n = 2): TL 4.28–4.32 (4.30), PL 0.77, PW 1.43, EL 3.55–3.71 (3.63), EW 1.89–1.97 (1.93). Females (n = 2): TL 4.44–4.55 (4.50), PL 0.85, PW 1.47, EL 3.74–3.94 (3.84), EW 2.05–2.08 (2.10).

Etymology. This species is named angusta from the Latin, meaning narrow, in reference to its relatively narrow body.

Distribution. This species has been found in Río Negro Province, in the following localities: Nahuel Huapi National Park, Grande stream; Nahuel Huapi National Park, Lower Manso River, Las Vertientes stream; and El Bolsón; and in Chubut Province, in the following locality: Puelo Lake.

Figures

FIGURES 1 – 8. Habitus illustrations of Argentinean species of Pseudomicrocara, dorsal view. 1) P. angusta sp. nov.; 2) P. antarctica; 3) P. hieroglyphica sp. nov.; 4) P. inflexipenis sp. nov.; 5) P. livida.; 6 – 7) P. obliquata; 8) P. patagonica. Scale bar = 1 mm.

FIGURES 9 – 15. Mouthparts and heads of Pseudomicrocara. 9 – 10) P. angusta sp. nov., mandible and labium; 11 – 13) P. antarctica, mandibles and labium; 14) P. hieroglyphica sp. nov., male head; 15) P. hieroglyphica sp. nov., female head.

FIGURES 27 – 33. Pronota of Pseudomicrocara. 27) P. angusta sp. nov.; 28) P. antarctica; 29) P. hieroglyphica sp. nov.; 30) P. inflexipenis sp. nov.; 31) P. livida; 32) P. obliquata; 33) P. patagonica.

FIGURES 34 – 42. Sexual dimorphism in abdominal segments of Pseudomicrocara. 34) P. angusta sp. nov., female, abdomen; 35) P. angusta sp. nov., female, detail of patch of setae on ventrite 4; 36) P. antarctica, female, abdomen; 37) P. antarctica, female, detail of patch of setae on ventrite 4; 38) P. hieroglyphica sp. nov., female, abdomen; 39) P. hieroglyphica sp. nov., detail of patch of setae on ventrite 4; 40) P. inflexipenis sp. nov., female, abdomen; 41) P. inflexipenis sp. nov., detail of patch of setae on ventrite 4; 42) P. inflexipenis sp. nov., detail of posterior margin of ventrite 5.

FIGURES 43 – 51. Female genital morphology of Pseudomicrocara. 43 – 46) P. antarctica: 43) sternite 8, 44) tergite 8, 45) ovipositor + genital tract (ovaries excluded) (scale bar = 0.5 mm), 46) prehensor; 47) P. angusta sp. nov., prehensor; 48) P. hieroglyphica sp. nov., prehensor; 49) P. inflexipenis sp. nov., prehensor; 50) P. livida, prehensor; 51) P. patagonica, prehensor. Abbreviations: bsa: bursa, bsl: bursella, bslp: bursella pores, ovc: common oviduct, prh: prehensor.

FIGURES 52 – 59. Bursella pores of Pseudomicrocara. 52 – 53) P. hieroglyphica sp. nov.; 54 – 55) P. antarctica; 56) P. patagonica; 57 – 58) P. livida; 59) P. angusta sp. nov.

FIGURES 60 – 65. Male terminalia and genitalia of P. angusta sp. nov. 60) Sternite 8; 61) sternite 9; 62) tergite 8; 63) tergite 9; 64) tegmen; 65) penis. Scale bar = 0.5 mm.