Plaumanniola octosetosa (Franz), 2016

Jałoszyński, Paweł, 2016, Euconnus octosetosus Franz transferred to Plaumanniola Costa Lima: implications for the systematics of Scydmaeninae (Coleoptera: Staphylinidae), Zootaxa 4098 (2), pp. 358-368 : 361-362

Plaumanniola octosetosa (Franz)

( Figs 1 , 5–11 , 15 )

Euconnus (s. str.) octosetosus Franz, 1994: 74 , fig. 13.

Type material studied. Holotype: BRAZIL (Amazonas state): ♂, three labels: " Umg.Manaus / Amazonasgebiet / Brasil,lg. l.Beck " [white, printed, with handwritten "A17" on the reverse side], " Euconnus / octosetosus / m / det. H.Franz " [white, handwritten and printed], "Holotypus" [red, handwritten] ( NHMW) .

Diagnosis. Head only slightly broader than long; pronotum much narrower than elytra and broadest near base; antennae long and slender, with club composed of five antennomeres, of which only X and XI are compactly assembled; legs not flattened; aedeagus in ventral view gradually narrowed distally.

Redescription. Body of male ( Fig. 1 ) relatively slender and convex, reddish brown, covered with light brown vestiture. BL 1.78 mm.

Head ( Fig. 1 ) in dorsal view nearly circular, strongly flattened, broadest at eyes, HL 0.38 mm, HW 0.40 mm; vertex strongly transverse and weakly, evenly convex, anteriorly confluent with weakly convex frons with broadly rounded anterior margin; tempora distinctly longer than eyes; supraantennal tubercles distinct but weakly raised; compound eyes large and coarsely faceted. Vertex and frons covered with sparse and inconspicuous punctures; setae present only on anterior portion of frons, sparse, long and suberect, posteriorly replaced by thick curved bristles directed posteriorly. Antennae ( Fig. 1 ) long and slender, with club composed of five antennomeres and slightly longer than half AnL, antennomeres X and XI compactly assembled; AnL 0.90 mm, antennomeres I and II elongate, III distinctly transverse, IV slightly transverse, V–VI each about as long as broad, VII–IX each distinctly transverse, X nearly as long as broad, XI slightly narrower than X, nearly as long as IX–X together, about twice as long as broad.

Pronotum much more convex than head, subtrapezoidal with rounded sides, broadest between middle and posterior third; PL 0.43 mm, PW 0.50 mm. Anterior margin arcuate; anterior corners obtuse-angled; sides strongly rounded; posterior margin weakly arcuate; posterior corners rounded, weakly marked; pronotal base with indistinct transverse impression obliterated at middle. Punctures inconspicuous, shallow and small; setae on pronotal disc moderately long, sparse and suberect, sides of pronotum with dense, thick bristles.

Elytra more convex than pronotum, oval, broadest near anterior third; EL 0.98 mm, EW 0.83 mm, EI 1.18. Elytral base in dry-mounted specimen with barely discernible trace of one basal fovea. Punctures more distinct than those on head and pronotum, but shallow and small, with diffused margins; setae sparse, moderately long, suberect.

Legs relatively long and slender, femora and tibiae only slightly flattened; femora lacking tibial grooves

Aedeagus ( Figs. 10–11 ) elongate; AeL 0.38 mm; median lobe in ventral view broadest near basal third and gradually narrowing distally; apex subtriangular; internal armature asymmetrical and complicated, with variously darkly sclerotized components; parameres slender, with 3–4 long apical and subapical setae.

Female. Unknown.

Distribution. Northern Brazil, state Amazonas ( Fig. 15 a).

Remarks. Species of Plaumanniola have relatively uniform aedeagi ( Figs 10–14 ), with a long subtriangular ventral plate, at least partly asymmetrical and complicated assemblage of internal structures and parameres bearing several robust apical and subapical setae. The aedeagus of P. octosetosa is most slender among copulatory organs known in this genus, but very similar to the aedeagus of P. sanctaecatharinae ( Fig. 13 ). The latter species, however, differs from P. octosetosa strikingly in the general habitus ( Fig. 3 ).

Figures

FIGURE 15. Distribution of Plaumanniola. Plaumanniola octosetosa (Franz) (a), P. simplicissima Jałoszyński (b), P. regina Jałoszyński (c), and P. sanctaecatharinae Costa Lima (d).

FIGURES 1 – 4. Dorsal habitus of Plaumanniola octosetosa (Franz) (1), P. simplicissima Jałoszyński (2), P. sanctaecatharinae Costa Lima (3) and P. regina Jałoszyński (4).

FIGURES 5 – 9. Plaumanniola octosetosa (Franz). Head in ventral view (5), mouthparts in ventral view (6), left antennal club in ventral view (7), prothorax and mesothorax in ventral view (8), pterothorax in ventral view (9). Abbreviations: ar, anterior ridge; bst, basisternal part of prosternum; bst, basistipes; gal, galea; gp, gular plate; gs, gular suture; hr, hypostomal ridge; hyr, hypomeral ridge; lig, ligula; lp, labial palp; mn, mentum; mst, mediostipes; msvp, mesoventral intercoxal process; mtvp, metaventral intercoxal process; nss, notosternal suture; pcr, procoxal rest; ppf, palpifer; ptp, posterior tentorial pit; smn, submentum; v 3, metaventrite.

FIGURES 10 – 14. Aedeagus in ventral (10, 12 – 14) and lateral (11) view. Plaumanniola octosetosa (Franz) (10 – 11), P. simplicissima Jałoszyński (12), P. sanctaecatharinae Costa Lima (13) and P. regina Jałoszyński (14).