Plaumanniola sanctaecatharinae Costa Lima

Jałoszyński, Paweł, 2013, A new species of the putatively myrmecophilous genus Plaumanniola Costa Lima, with notes on the systematic position of Plaumanniolini (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 3670 (3), pp. 317-328 : 320-322

Plaumanniola sanctaecatharinae Costa Lima

( Figs. 1–2 , 4 , 12–13 )

Plaumanniola sanctaecatharinae Costa Lima, 1962: 416 , Figs. 1–4 .

Type material. Paratype: BRAZIL (Santa Catarina state): 3, five labels ( Fig. 2 ): "CHAPECO' / 27'07 52'36 / 600 m " [yellowish, printed]; "F. Plaumann / August 1960 " [yellowish, printed]; " Plaumanniola / sanctaecatharinae / C.L. 1962 / Costa Lima det." [yellowish with black frame, handwritten and printed]; "PARATYPO" [white with reddish hue and black frame; reverse side red, printed]; and red rectangle with black line ( MZSP).

Diagnosis. Body shorter than 2 mm; antennae with sharply delimited club composed of antennomeres VII–XI; tempora longer than small eyes; all tibiae broadest near distal third; each paramere with three setae.

Redescription. Body of male ( Fig. 1 ) moderately stout and convex, light brown, covered with light brown vestiture. BL 1.90 mm.

Head ( Fig. 4 ) in dorsal view subtrapezoid, strongly flattened, broadest at posterior margin of vertex, HL 0.38 mm, HW 0.68 mm; vertex strongly transverse and only weakly, evenly convex; tempora distinctly longer than eyes; frons posteriorly confluent with vertex, between eyes regularly convex, between feebly marked supraantennal tubercles distinctly impressed; compound eyes small, with deeply and broadly emarginate posterior margin. Vertex and frons glossy, covered with sparse and fine setiferous punctures separated by spaces as long as 4– 5 x puncture diameters. Setae on head dorsum sparse but long, curved and suberect, directed posteriorly.

Antennae ( Fig. 4 ) short, with compact, slightly flattened dorso-ventrally and sharply demarcated club composed of five distal antennomeres, AnL 0.53, antennomere I about twice as long as broad; II as broad as I but much shorter, slightly broader than long; III slightly narrower than II and much shorter, strongly transverse; IV about as long and broad as III; V slightly broader and longer than IV, strongly transverse and distinctly asymmetrical, with proximal margin transverse in relation to long axis of antenna while distal margin strongly oblique and external lateral margin much longer than mesal lateral margin; VI slightly broader and longer than IV, of similar shape except that both proximal and distal margins are strongly oblique in relation to long axis of antenna and mesal lateral margin forming small projection; VII slightly shorter than VI but distinctly broader, strongly transverse, 4x as broad as long; VIII as broad as VII but distinctly longer, strongly transverse, 3x as broad as long; IX as broad as VIII but slightly longer, strongly transverse, 2.8x as broad as long; X as broad as IX and yet longer, strongly transverse and ca. 2.5x as broad as long; XI subconical with blunt apex, distinctly narrower than X, about 1.8x as long as broad. Antennomeres I–VI with sparse long and erect setae distributed mainly along their mesal margin; antennomeres VII–XI moderately densely covered with long and nearly recumbent setae directed toward antennal apex and additionally with sparse strongly erect long setae.

Pronotum slightly more convex than head, approximately oval, broadest distinctly anterior to middle; PL 0.53 mm, PW 0.83 mm. Anterior and lateral margins confluent, anterior pronotal corners not marked; anterior margin arcuate and slightly concave just behind head; lateral margins strongly rounded; posterior pronotal corners strongly obtuse and blunt but well-marked; base of pronotum in middle strongly and abruptly projecting posterad, forming short and broad subtrapezoid lobe over base of elytra demarcated laterally by obtuse angles; posterior pronotal margin nearly straight. Punctures and setae similar to those on vertex and frons.

Elytra more convex than pronotum, oval, broadest between middle and anterior third; EL 1.00 mm, EW 0.83 mm, EI 1.21. Punctures more distinct than those on head and pronotum, shallow and small, with moderately distinct margins, separated by spaces 2– 3 x as wide as puncture diameters; setae similar to those on head and pronotum but distinctly longer and more erect

Legs short and robust; protibiae slightly curved inwards in distal third; meso- and metatibiae nearly straight; all tibiae broadest near distal third.

Aedeagus ( Figs. 12–13 ) pear-shaped; AeL 0.38 mm; median lobe in ventral view with long subtriangular apical part; internal armature complex and partly asymmetrical; parameres in lateral view curved, each with three setae.

Female. Not studied; see Remarks.

Distribution. Southern Brazil, state Santa Catarina.

Remarks. According to Costa Lima (1962), the type series of Plaumanniola sanctaecatharinae was composed of a female holotype and 11 paratypes. The holotype and five paratypes were originally in the collection of Costa Lima and six paratypes in the collection of Plaumann ( Costa Lima 1962). Lawrence & Reichardt (1966) stated that a single paratype specimen was bought by Reichardt from Plaumann and deposited "in the collection at São Paulo" (i.e., at Departamento de Zoologia). Currently three paratypes are housed at MZSP (email from S. Casari dated 15.03.2013), and I was not able to locate neither the holotype nor any of the remaining paratypes. Illustrations given by Costa Lima (1962) show that the general body shape and the structure of antennae of males and females do not differ, and structures of the paratype male studied during the present work match well images presented by Costa Lima. Later "redescription" by Franz (1990) was based on misidentified specimens (belonging to the new species described below).

Figures

FIGURES 1 – 3. Plaumanniola sanctaecatharinae Costa Lima, dorsal habitus of paratype male (1) and its original set of labels (2); Plaumanniola regina sp. n., dorsal habitus of paratype male (3).

FIGURES 4 – 5. Heads of paratype males in dorsal view. Plaumanniola sanctaecatharinae Costa Lima (4) and Plaumanniola regina sp. n. (5).

FIGURES 12 – 15. Aedeagus of Plaumanniola sanctaecatharinae Costa Lima (12 – 13) and Plaumanniola regina sp. n. (14 – 15) in ventral (12, 14) and lateral (13, 15) views.