Status of Nearctic subgenera of Microscydmus revisited (Coleoptera, Staphylinidae, Scydmaeninae)
Author
Jałoszyński, Paweł
text
Zootaxa
2017
2017-11-30
4358
3
journal volume
31265
10.11646/zootaxa.4358.3.8
9af6b3e2-4522-4219-b827-5adb389e474d
1175-5326
1068848
B45BD8C4-C084-4BAC-BF07-70378F008519
Neladius tenuis
Casey
, stat. rest.
(
Figs 3, 6
,
9, 12
,
15
,
18–19
)
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
): "
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
.
FIGURES 13–15.
Microscydmus
(
Opresus
)
misellus
(LeConte)
(13);
Delius robustulus
Casey
(14);
Neladius tenuis
Casey
(15); pterothorax and abdomen in ventral view. Abbreviations: msvp, mesoventral intercoxal process; mtvp, metaventral intercoxal process; pcr, procoxal rest; pm, paramere; stVII–VIII, abdominal sternite VII–VIII.
FIGURES 16–19.
Delius robustulus
Casey
(16–17);
Neladius tenuis
Casey
(18–19). Aedeagus in ventral (16, 18) and lateral (17, 19) views.
Description.
Body of male (
Fig. 3
) 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
,
9, 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
) 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
,
9
) 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
) 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
) 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
and with labels as in
Fig. 6
is here designated as
lectotype
of
Neladius tenuis
Casey, 1897
. The other specimen turned out to be a male.