Neladius tenuis Casey

Jałoszyński, Paweł, 2017, Status of Nearctic subgenera of Microscydmus revisited (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4358 (3): -

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Neladius tenuis Casey


Neladius tenuis Casey   , stat. rest.

( Figs 3, 6 View FIGURES 1–6 , 9, 12 View FIGURES 7–12 , 15 View FIGURES 13–15 , 18–19 View FIGURES 16–19 )

Neladius tenuis Casey, 1897: 499   .

Microcydmus (Delius) tenuis (Casey)   ; Franz, 1985: 176. Microscydmus (Neladius) tenuis (Casey)   ; O'Keefe: 264.

Type material studied. Lectotype (here designated): ♂: six labels ( Fig. 6 View FIGURES 1–6 ): " CASEY / bequest / 1925" [white, printed], "St. Vinc / Penn." [white, printed], "48" [white, handwritten], " Neladius   / tenuis   / Casey" [white, handwritten], " Delius   / tenuis (Casey)   / Holotypus / det.H.Franz" [white, handwritten and printed], " TYPE USNM / 49123" [red, printed and handwritten] ( NMNH). Paralectotype: ♂, four labels: " CASEY / bequest / 1925" [white, printed], "St. Vinc / Penn." [white, printed], "48" [white, handwritten], "tenuis- 2 / PARATYPE USNM / 49123" [red, handwritten and printed] ( NMNH).

Diagnosis. As in genus, vide supra.

Description. Body of male ( Fig. 3 View FIGURES 1–6 ) moderately convex, elongate, with moderately long appendages, BL 0.94– 1.00 mm; cuticle glossy, uniformly light brown; vestiture of setae slightly lighter than cuticle.

Head ( Figs 3 View FIGURES 1–6 , 9, 12 View FIGURES 7–12 ) subtrapezoidal, broadest at eyes, HL 0.15–0.16 mm, HW 0.19–0.2 mm; vertex and frons confluent, weakly convex; supraantennal tubercles feebly marked; tempora in anterior half nearly parallel; eyes small, weakly convex and finely faceted. Punctures on vertex and frons fine and inconspicuous; setae short, sparse, suberect. Antennae ( Fig. 3 View FIGURES 1–6 ) short, AnL 0.38 mm; scape and pedicel elongate, scape slightly longer than pedicel, antennomeres III –VII each about as long as broad, VII distinctly larger than VIII, VIII –X transverse, XI shorter than IX and X combined, about as long as broad.

Pronotum ( Figs 3 View FIGURES 1–6 , 9 View FIGURES 7–12 ) in dorsal view oval, broadest in anterior third, PL 0.25 mm, PW 0.23 mm; anterior margin rounded and confluent with lateral margins, which are strongly rounded in anterior half and nearly straight in posterior third, where they are strongly convergent; posterior corners strongly obtuse-angled and blunt; posterior margin rounded. Punctures on pronotal disc as fine as those on frons and vertex; setae short and sparse, suberect.

Elytra ( Fig. 3 View FIGURES 1–6 ) suboval, broadest in anterior third, EL 0.53–0.60 mm, EW 0.33–0.35 mm, EI 1.50–1.85; basal impressions and humeral calli absent; apices separately rounded. Punctures on elytral disc as inconspicuous as those on head and pronotum; setae sparse, short, suberect.

Hind wings absent.

Legs moderately long and slender; unmodified.

Aedeagus ( Figs 18–19 View FIGURES 16–19 ) elongate, AeL 0.18 mm, thin-walled, with symmetrical median lobe and strongly asymmetrical, darkly sclerotized and complicated endophallic structures; parameres strongly broadened distally and in apical region curved mesodorsally, each with one long subapical seta and one or two tiny apical setae.

Distribution. Pennsylvania.

Lectotype designation. Casey (1897) mentioned a male and a presumable female in his description. The male was identified by him on the basis of a tip of the aedeagus protruding from the genital opening, and this specimen, illustrated in Fig. 3 View FIGURES 1–6 and with labels as in Fig. 6 View FIGURES 1–6 is here designated as lectotype of Neladius tenuis Casey, 1897   . The other specimen turned out to be a male.


Smithsonian Institution, National Museum of Natural History


Smithsonian Institution, National Museum of Natural History














Neladius tenuis Casey

Jałoszyński, Paweł 2017

(Delius) tenuis

Franz 1985: 176

Neladius tenuis

Casey 1897: 499