Microscydmus (Opresus) misellus (LeConte, 1852)

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

publication ID

https://doi.org/10.11646/zootaxa.4358.3.8

publication LSID

lsid:zoobank.org:pub:B45BD8C4-C084-4BAC-BF07-70378F008519

persistent identifier

http://treatment.plazi.org/id/3643654E-0014-FFA3-A3F5-AAFBFBF0CBC5

treatment provided by

Plazi

scientific name

Microscydmus (Opresus) misellus (LeConte, 1852)
status

 

Microscydmus (Opresus) misellus (LeConte, 1852)   , comb. rest.

( Figs 1, 4 View FIGURES 1–6 , 7, 10 View FIGURES 7–12 , 13 View FIGURES 13–15 )

Scydmaenus misellus LeConte, 1852: 155   .

Opresus misellus (LeConte)   ; Casey, 1897: 495.

Microscydmus (s. str.) misellus (LeConte)   ; Franz, 1985: 176.

Type material studied. Lectotype (here designated): sex unknown: seven labels ( Fig. 4 View FIGURES 1–6 ): "J. LECONTE / COLLECTION" [white, printed], " S. misellus   / Lec." [white, handwritten], " Microscydmus   / misellus   / Lec. / det.H.Franz" [white, handwritten and printed], "Opresus / det. W. Suter '77" [white with black margins, handwritten], " TYPE / LECONTE-MCZ" [pink, typed], " Type / 6235" [red, printed and handwritten], and small red circle ( MCZ).

Diagnosis. BL 0.80 mm; body light brown; anterior margin of frons in dorsal view subtriangular and rounded; antennomeres III –X transverse; punctures on head and pronotum very fine, inconspicuous, those on elytra slightly more distinct but only superficial and diffuse; pronotum about as long as broad; EI 1.46.

Description. Body of lectotype of unknown sex ( Fig. 1 View FIGURES 1–6 ) moderately convex with slightly flattened elytral dorsum, elongate, with moderately long appendages, BL 0.80 mm; cuticle glossy, uniformly light brown; vestiture of setae and bristles slightly lighter than cuticle.

Head ( Figs 1 View FIGURES 1–6 , 7, 10 View FIGURES 7–12 ) subhexagonal, broadest at eyes, HL 0.13 mm, HW 0.19 mm; vertex and frons confluent, weakly convex; supraantennal tubercles feebly marked; eyes large, strongly convex and coarsely faceted. Punctures on vertex and frons fine and inconspicuous; setae short, sparse, suberect, tempora and genae with sparse bristles. Antennae ( Fig. 1 View FIGURES 1–6 )) short, AnL 0.35 mm; scape and pedicel elongate, scape slightly longer than pedicel, antennomeres III –IX distinctly transverse, XI shorter than IX and X combined, about as long as broad.

Pronotum ( Figs 1 View FIGURES 1–6 , 7 View FIGURES 7–12 ) in dorsal view nearly round, broadest slightly in front of middle, PL 0.20 mm, PW 0.21 mm; anterior margin rounded, very indistinctly demarcated from lateral margins which are strongly rounded in anterior half and nearly straight in posterior third; posterior corners obtuse-angled and blunt; posterior margin shallowly bisinuate; four antebasal pits shallow and small but distinct, separated by subequal spaces, inner pair connected by shallow and diffuse transverse impression (poorly visible in Fig. 7 View FIGURES 7–12 ). Punctures on pronotal disc as fine as those on frons and vertex; setae short and sparse, suberect, sides and lateroventral portions of hypomera sparsely covered with thick bristles.

Elytra ( Fig. 1 View FIGURES 1–6 ) suboval and slightly flattened, broadest in front of middle, EL 0.48 mm, EW 0.33 mm, EI 1.46; basal impressions shallow but distinct, humeral calli elongate; apices separately rounded. Punctures on elytral disc slightly more distinct than those on head and pronotum but superficial and diffuse; setae sparse, short, suberect.

Hind wings not studied.

Legs moderately long and slender; unmodified.

Distribution. Georgia and Louisiana (according to Casey (1897)).

Remarks. The only available specimen is in a fragile condition and was not dissected to avoid further damage. Identifications and descriptions of new North American species must be based on direct comparisons with the lectotype of M. misellus   , as the current diagnosis lacking genital characters may be ambiguous.

Lectotype designation. LeConte (1852) clearly stated that the type series was composed of two specimens; consequently, the specimen preserved at MCZ (illustrated in Fig. 1 View FIGURES 1–6 and with labels as in Fig. 4 View FIGURES 1–6 ) is a syntype. This specimen is here designated as lectotype for Scydmaenus misellus LeConte, 1852   .

MCZ

Museum of Comparative Zoology

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Microscydmus

Loc

Microscydmus (Opresus) misellus (LeConte, 1852)

Jałoszyński, Paweł 2017
2017
Loc

Microscydmus (s. str.) misellus

Franz 1985: 176
1985
Loc

misellus

Casey 1897: 495
1897