Plaumanniola cayennensis,

Jałoszyński, Paweł, 2018, A new species of Plaumanniola Costa Lima in French Guiana (Coleoptera: Staphylinidae), Zootaxa 4508 (3), pp. 431-434: 432

publication ID

https://doi.org/10.11646/zootaxa.4508.3.6

publication LSID

lsid:zoobank.org:pub:C78325D8-2F25-48C0-9D01-739194968928

persistent identifier

http://treatment.plazi.org/id/396A6831-6C42-EA01-FF68-FEBF3048622C

treatment provided by

Plazi

scientific name

Plaumanniola cayennensis
status

sp. n.

Plaumanniola cayennensis  sp. n. ( Figs 1–9View FIGURES 1–8View FIGURE 9)

Material studied. Holotype: FRENCH GUIANA:  ♂, two labels: "NLT(LP) x3: Amazon Natu- / re Lodge (282m), Kaw mts / 45 km SW from Cayenne / [FR. GUIANA] / N04° 33'59'' W52° 12'42'' / 3-4.ii.2017, S.Nomura leg." [white, printed], " PLAUMANNIOLA  / cayennensis  m. / P. Jałoszyński, '18 / HOLOTYPUS " [red, printed] ( NSMT)GoogleMaps  . Paratypes: 3 ♂♂, same data as for holotype ( NSMT, cPJ)GoogleMaps  .

Diagnosis. Head slightly broader than long and much narrower than pronotum; pronotum only slightly narrower than elytra, broadest near middle and with sides strongly, evenly rounded; antenna with club composed of five antennomeres, of which IX–XI are compactly assembled, and VII is only slightly broader than VI; legs weakly flattened, with mesotrochanter in males bearing a long ventral projection; aedeagus in ventral view slender and rapidly narrowed distad, each paramere with two long subapical setae near apex and one short seta inserted far from apex.

Description. Body of male ( Figs 1–2View FIGURES 1–8) stout and weakly convex, brown, covered with light brown vestiture. BL 1.86–1.95 mm.

Head ( Fig. 3View FIGURES 1–8) in dorsal view subtrapezoidal, strongly flattened, broadest clearly behind eyes, HL 0.38–0.40 mm, HW 0.49–0.50 mm; vertex strongly transverse and weakly, evenly convex, anteriorly confluent with weakly convex frons; tempora in dorsal view slightly shorter than eyes; supraantennal tubercles absent; eyes large and coarsely faceted. Vertex and frons covered with distinct but small punctures separated by spaces 2–3 times as wide as diameters of punctures, and with sparse, long, suberect setae, posteriorly replaced by thick bristles; cuticle of head dorsum with fine and diffuse microreticulation. Antennae ( Fig. 3View FIGURES 1–8) relatively long and slender, with flattened pentamerous club about as long as half AnL, AnL 0.80–0.83 mm, antennomeres I and II elongate, III–X distinctly transverse, VII only slightly broader than VI, XI indistinctly shorter and much narrower than IX–X, about twice as long as broad; club with sparse and conspicuously long erect setae.

Pronotum more convex than head, broadest near middle; PL 0.46–0.50 mm, PW 0.65–0.68 mm. Anterior margin with a narrow median emargination, anterior corners broadly rounded and projecting anterad, sides strongly and evenly rounded, posterior corners strongly obtuse-angled and barely discernible, posterior margin arcuate. Microsculpture similar to that on head but even more diffuse and superficial, setae and punctures as those on frons and vertex, lateral bristles only slightly thicker than setae on disc.

Elytra more convex than pronotum, oval, broadest between middle and anterior third; EL 1.00– 1.08 mm, EW 0.83– 0.85 mm, EI 1.21–1.30. Elytral base with weakly elevated, small humeral calli. Punctures similar to those on head and pronotum; setae distinctly longer, strongly erect; microsculpture absent.

Legs only weakly flattened, robust; mesotrochanters modified ( Fig. 4View FIGURES 1–8), each with a ventral rod-like projection.

Aedeagus ( Figs 5–8View FIGURES 1–8) elongate and relatively slender; AeL 0.40 mm; median lobe in ventral view broadest near basal third and gradually narrowing to subapical region, where it is narrowed rapidly to form a subtrapezoidal apex; internal armature asymmetrical and complicated; parameres slender, each with 3 subapical setae, of which two long and curled ones are inserted near apex, and one short and straight far from the apex.

Female. Unknown.

Distribution. Northeastern French Guiana ( Fig. 9View FIGURE 9).

Etymology. Locotypical, after the capital city of French Guiana.

Remarks. Plaumanniola cayennensis  is externally most similar to the Bolivian P. simplicissima  ; these species share not only the adult body shape, but also the antennal structure, with antennomeres IX–XI compactly assembled and VII– VIII loosely assembled, the basal stalks of the latter exposed, as in proximal antennomeres. The aedeagi, however, differ markedly, that of P. cayennensis  being much more slender. The aedeagus of P. cayennensis  is most similar to that of P. octosetosa  , both being most slender of the copulatory organs found among species of Plaumanniola  . Externally, these species differ remarkably, with the body of P. octosetosa  being Euconnus  -like, i.e., with a subtrapezoidal pronotum broadest near base, and that of P. cayennensis  strongly transverse and broadest near middle.

NSMT

National Science Museum (Natural History)