Iapir vanini, Sampaio, Brunno Henrique Lanzellotti & Ferreira-Jr, Nelson, 2014

Sampaio, Brunno Henrique Lanzellotti & Ferreira-Jr, Nelson, 2014, A new species of Iapir Py-Daniel, Fonseca & Barbosa (Coleoptera: Myxophaga: Torridincolidae) from Brazil with key to species of the genus, Zootaxa 3753 (2), pp. 196-200 : 197-199

Iapir vanini sp. nov.

( Figs. 1 a–g)

Diagnosis. This species differs from the other congeneric species by the presence of a fringe of setae on the anterior face of front tibiae and on the posterior face of hind tibiae; the male genitalia are also extremely different from all other Iapir species, with an oblique apex in lateral view and bearing tufts of seta on distal third.

Description. Holotype. Body and antennae black, shining in dorsal view; legs and ventral surface brown. Total length: 1.75 mm; head width 0.38 mm; pronotal length 0.39 mm, width 0.75 mm; elytral length 1.01 mm, width 0.96 mm.

Anterior margin of labrum ( Fig. 1 c) straight with antero-lateral angles rounded, fringed with long and fine setae. Anterior margin of clypeus truncate and lateral margins convex; surface with sparse micro-iridescent punctures. Mandibles asymmetrical ( Fig. 1 d): left mandible with a pair of apical non-articulated teeth and a subapical articulated tooth; molar lobe with transverse ridges on the dorsal surface; right mandible with a apical non-articulated tooth and a subapical articulated tooth; molar lobe and prostheca like on left mandible. Maxilla ( Fig. 1 e): mala without suture dividing it; with four apical laminar processes and a row of subapical setae; stipes with a subapical long seta; palpus with three palpomeres (palpomeres II and III similar in length; basal palpomere half length of second palpomere). Frons bearing a pair of carinae laterally; carinae not strongly raised and more conspicuous near antennae. Surface of head microrugose posteriorly, in front of pronotum.

Anterior margin of pronotum ( Fig. 1 a) bisinuate; lateral margin convex; greatest width on posterior fourth; posterior margin biarcuate with a very small medial projection and bearing fine setae on medial 1/2 and some longer setae near postero-lateral angles; surface with iridescent micro-punctures; anterior third depressed on the disc; postero-lateral angles depressed and flattened. Scutellum very small, with a truncate anterior margin. Elytra ( Fig. 1 a) with convex anterior margins raised from elytral suture to 11th interval; lateral margins crenulate, converging to acute apices; 13 striae formed by iridescent punctures; odd intervals raised from third to 11th; 13th interval with a carina extending from humerus to apex. Epipleuron with lateral margin raised near the humerus. Posterior wing reduced. Anterior margin of prosternum ( Fig. 1 b) crenulate and feebly concave; lateral margin subparallel on anterior half, oblique on posterior half; postero-lateral angles rounded; posterior margin sinuate. Mesosternum with anterior margin depressed, except for a medial gibbosity that fits into an internal cavity on prosternum; more than twice as wide as long; surface smooth. Metasternum disc smooth, with a shallow medial impression; metasternal carina complete. Front and middle coxae with a row of setae on posterior face; front tibia with a fringe of setae on anterior face; middle tibia with setae on anterior and posterior face, smaller than those of front tibia; hind tibia with a fringe of longer setae on posterior face. Tarsomere I smaller than others; tarsomere II bearing two setae of different length; apical tarsomere longer than subapical tarsomere.

Abdomen ( Fig. 1 b) carinate medially; carina more conspicuous on first ventrite and ending on a gibbosity on the last ventrite; semi-lunar depression present, but not conspicuous (at least in male). Male genitalia ( Figs. 1 f, g) with median lobe about three times phallobase length, not flattened; in lateral view slightly more convex in median third, ventral margin sinuate, with oblique, digitiform apex; in dorsal view, narrowing abruptly from distal third to apex and with tufts of long lateral setae in this region; parameres very short, about as long as the process of phallobase; each paramere unisetose, seta shorter than half of paramere length.

Bionomic Notes. The specimens were collected in hygropetric localities together with some specimens of Ytu . Larvae of Iapir were found in the same localities, but it is not possible to identify them as larvae of Iapir vanini sp. nov., because the larvae of Iapir species have no diagnostic characteristics observed.

Female. Like on some species of Iapir , this new species presents sexual dimorphism of the semi-lunar impression on abdomen. On females the impression is medially projected toward the apex of abdomen, while on males the impression is simple, without projection.

Variation. Total length: 1.61–1.75 mm; head width 0.34–0.38 mm; pronotal length 0.33–0.39 mm, width 0.68–0.75 mm; elytral length 1.01–1.10 mm, width 0.90–0.96 mm.

Etymology. This species is named in honor of Dr. Sergio Vanin, whose interest in torridincolids has increased the knowledge of this family of Coleoptera .

Comparative notes. The new species differs from Iapir trombetensis (Fonseca, Py-Daniel & Barbosa) and I. quadridentatus Braule-Pinto, Fonseca & Hamada by the lack of a tooth on posterior trochanter, present on these two species ( Braule-Pinto et al. 2011; Fonseca et al. 1991). Although the figure of the hind trochanter of I. trombetensis presented by Fonseca et al. (1991) shows a conspicuous tooth, the paratypes analyzed only presented a feeble tooth. It differs from these two species by the shape of the male genitalia: elongated and narrowing toward apex in ventral view on I. trombetensis and I. quadridentatus , while the new species has short genitalia, narrowing abruptly on distal third ( Braule-Pinto et al. 2011; Fonseca et al. 1991). Iapir vanini sp. nov. possesses reduced hind wings, much like I. castalia (Reichardt) . This character is present in Satonius kurosawai (Satô) , but some specimens of this species present a developed hind wing ( Hájek et al. 2011), suggesting that this characteristic may be variable in other species. The new species may be distinguished from I. castalia by the presence of tufts of setae on the distal third of male genitalia and its oblique apex. In I. castalia the apex is digitform and there is no tuft of setae ( Reichardt 1973). Iapir britskii (Reichardt & Costa) and I. borgmeieri are very similar to the new species and may be diagnosed from it by the lack of tufts of setae on male genitalia ( Reichardt 1973; Reichardt & Vanin 1976).

Type material: Brazil, Espirito Santo state, Santa Teresa Municipality. Holotype, Male. Reserva Biológica Santa Lúcia, Córrego Sagui, 19°58’02.7”S 40°32’10.5”W, 03.IV.2011, Jardim, G.A. leg. [ DZRJ Coleoptera-5634]; deposited in DZRJ. Paratypes: 7 specimens, same data as holotype [ DZRJ Coleoptera- 5635]; 1 male and 1 female, same data as holotype [ MNRJ]; 3 males and 1 female, Castelo Municipality, Parque Estadual do Forno Grande, Riacho de 1a ordem, 20°31’00.1”S 41°05’05.8”W, 30.III.2011, Jardim, G.A.; Dumas, L.L.; Nessimian, J.L. leg. [ DZRJ Coleoptera-5636]; 1 male and 1 female, Domingos Martins Municipality, Parque Estadual da Pedra Azul, Córrego das Piscinas, 20°23’51.4”S 41°01’23.9”W, 01.IV.2011, Jardim, G.A. leg. [ DZRJ Coleoptera-5637].

g, h- Hind wings: g) Iapir trombetenis; h) Iapir quadridentatus .

Figures

FIGURE 1. Iapir vanini sp. nov. a – b) Habitus (scale: 1 mm): a) dorsal; b) ventral. c – e) Mouthparts (scale: 0.1 mm): c) labrum; d) mandibles; e) left maxilla. f – g) Male genitalia (scale: 0.1 mm): f) lateral view; g) dorsal view.