Paxillus borellii (Pangella, 1905)

Mattos, Ingrid & Mermudes, José Ricardo M., 2013, Synopsis of Paxillus MacLeay, 1819 (Coleoptera: Passalidae): distributional records and descriptions of four new species from Brazil, Zootaxa 3652 (3), pp. 327-342 : 332-334

Paxillus borellii (Pangella, 1905)

( Figs. 10–11 )

Paxillosomus borellii Pangella. 1905: 3 .

Paxillus borelli [sic], Fonseca & Reyes-Castillo 2004: 12 (list).

Type locality. Asuncion, Paraguay.

Diagnosis. Female. Length 17–22 mm. Head ( Fig. 10 ): labrum with anterior margin from slightly to deeply curved; anterior frontal area unevenly punctate, punctures moderately coarse somewhat dense and shallow; median frontal area unevenly elevated, anterior and posterior ridges weakly elevated and well marked. Inner tubercles of variable size, when short, with distinct apex. Medial frontal tubercles robust, larger than inner tubercles, and distant from anterior angles of the head. Lateral frontal area deep, with uneven elevations, and coarse and sparse punctures. Bridge strong and smooth. Central tubercle short, not free, feebly dilated, somewhat merged with posterior lateral tubercles; posterior lateral tubercles short and evident by the transverse anterior ridge. Lateral postfrontal area either smooth or punctate. Antennal club ( Fig. 11 ): first antennomere reduced, usually half as long as second antennomere. Pronotum: anterior and lateral margins straight, sinuate near the anterior angles; anterior marginal groove short, usually reaching at least ¼ of anterior margin, rarely elongate, narrow and with fine punctures. Lateral marginal groove of pronotum narrow, with fine punctures, shallow and contiguous; lateral area with moderately coarse, irregular punctures, indistinct scar; posterior margin with or without short pubescence, or tuft of setae; medial groove reaching the anterior margin. Prosternal process posteriorly wide and truncate. Scutellum with median groove. Elytra: humerus with tuft of setae (females). Mesosternum smooth with elongate, opaque scar occupuing more than half of lateral area. Metasternum: disc evident; median and posterior lateral area with some coarse punctures. Mesotibia dorsally pubescent with one small median lateral spine.

Sexual dimorphism. Reyes-Castillo & Fonseca (1997) cited that the females of P. borellii have humeri pubescent with long setae, while the males were either with or without short setae. This information was corroborated by dissections.

Type material. Holotype not examined, deposited to Musei di Zoologia ed Anatomia Comparata della Università di Torino, Assunción, Torino, Italy.

The syntype of Paxillus pentaphylloides Luederwaldt, 1931 was examined, and it has the label: São Paulo, Jaraguá, V.1900 (MZSP).

Distribution. Luederwaldt (1931): Puerto Rico, Colombia, French Guiana, Brazil, and Paraguay. Fonseca & Reyes-Castillo (2004) cited Brazil: Amazonas, Pará, Pernambuco, Bahia, Espírito Santo, Minas Gerais, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, and Rio Grande do Sul.

Material examined. BRAZIL. Rio de Janeiro: Itatiaia, 700 m, 1 female, 5.VII.1935, Zikán leg. (MAPA); São Paulo: Jundiaí, 1 female (dissected), IX.1900, M. Becam leg. (MAPA); Santa Catarina: Seara, 1 female, 30.I.1996, A. Bonaldo leg. (MCNZ) Rio Grande do Sul: Cahy, 2 females, I.1932, Buck leg. (MAPA); Salto do Jacuí (Horto da CEEE), 1 female, 25–29.X.1999 (light trap); Tapes (Faz. São Miguel, 30°28’58,2”S 51°22’20,8”W), 1 female, 17.XII.2003, Equipe Probio leg.(entomological umbrella) (MCNZ); Itaíranga, 3 female, VI.1964; Nova Petrópolis, 1, III.1928, (MAPA).

Remarks. Paxillus borellii differs from the other species of the genus by the anterior margin of head with anterior angles forward; mesosternal scar oval and microcorrugated.

The aedeagus was described by Bührnheim (1978: plate V, Figs. 1–3 ), it is convex, longer than wide; phallus globular; parameres and phallobase fused. Parameres rounded at apex. Phallobase weakly shorter than parameres; ventral distal margin feebly notched (ventral view).

Figures

FIGURES 10 – 11. Paxillus borellii, female: 8, head and anterior margin of pronotum, dorsal; 9, antennae, dorsal. Scale = 0.5 mm.

FIGURES 1 – 5. Paxillus leachi, male: 1, head and anterior margin of pronotum, dorsal. 2, antennae, dorsal. 3 – 5. Aedeagus: 3, dorsal; 4, lateral; 5, ventral (ph, phallus; pp, parameres; phb, phallobase). AFA, anterior frontal area; MFA, median frontal area; MFT, medial frontal tubercle; LFT, lateral frontal tubercle; CT, central tubercle; LPT, lateral posterior tubercle; FF, frontal fossae. Scale bars = 0.5 mm (Figs. 3 – 5 to the same scale).