Heteroscydmus brasiliensis (Franz)

Jałoszyński, Paweł, 2017, Confused identity: Pseudoeudesis brasiliensis Franz transferred to Heteroscydmus Franz, and Pseudoeudesis castrii Franz placed in Anthicimimus Franz (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 4250 (4), pp. 378-388: 381-383

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Heteroscydmus brasiliensis (Franz)

comb. n.

Heteroscydmus brasiliensis (Franz)  , comb. n.

( Figs 1–2View FIGURES 1 – 3, 4–8View FIGURES 4 – 5View FIGURES 6 – 8)

Pseudoeudesis brasiliensis Franz, 1967: 668  .

Type material studied. Lectotype (here designated) ( BRAZIL): ♀: three labels ( Fig. 8View FIGURES 6 – 8): " Tropenwald b. Muriqui / südl. Rio de Janeiro / Brasilien,lgt. H.Franz " [white, printed], " Pseudoeudesis  / brasiliensis  / m. / det. H.Franz " [yellowish, handwritten and printed], " Typus " [red, handwritten] ( NHMWAbout NHMW)  . Paralectotypes: 4 ♀♀ (one drymounted, three mounted in euparal, including two on one plastic plate), same data as for lectotype ( NHMWAbout NHMW)  .

Revised diagnosis. BL of female <0.6 mm; EI> 1.5; pronotum about as long as broad, with four indistinct antebasal pits and transverse impression.

Redescription. Body of female ( Fig. 1View FIGURES 1 – 3) elongate and slender, flattened, BL 0.50–0.55 mm; pigmentation yellowish brown; vestiture of setae slightly lighter than cuticle.

Head ( Figs 1View FIGURES 1 – 3, 4View FIGURES 4 – 5) in dorsal view subtrapezoidal, broadest at eyes, HL 0.10–0.11 mm, HW 0.13 mm; tempora nearly twice as long as eyes, weakly convergent posteriorly; vertex and frons confluent and convex, anterior margin of frons slightly projected anteriorly and rounded; supraantennal tubercles feebly marked; eyes small, not projecting laterally from the silhouette of the head. Vertex and frons with inconspicuous fine punctures and sparse, short, suberect setae. Antennae ( Figs 1–2View FIGURES 1 – 3) relatively short, AnL 0.20 mm; antennomeres I and II distinctly elongate, III –X each strongly transverse, XI slightly shorter than IX and X combined, about as long as broad, subconical and blunt at apex.

Pronotum ( Figs 1View FIGURES 1 – 3, 4View FIGURES 4 – 5) broadest near anterior third, strongly narrowing anteriorly and posteriorly, PL 0.13–0.14 mm, PW 0.13–0.14 mm; anterior and posterior margins arcuate; sides strongly rounded in anterior half and slightly sinuate posteriorly; base with indistinct, diffuse transverse groove connecting one pair of shallow and similarly diffuse lateral pits, additionally one smaller but more distinct pit is located laterally and slightly anteriorly to inner pair of pits. Pronotal disc with punctures and setae similar to those on frons and vertex.

Elytra ( Fig. 1View FIGURES 1 – 3) oval, broadest between middle and anterior third; EL 0.28–0.30 mm, EW 0.18 mm, EI 1.57– 1.71; basal impressions shallow, humeral calli distinct, elongate. Punctures and setae similar to those on pronotal disc. Hind wings well developed.

Legs ( Figs 1–2View FIGURES 1 – 3) unmodified, with gradually clavate femora and short, robust tarsi.

Spermatheca ( Fig. 7View FIGURES 6 – 8) globular, slightly elongate, relatively thin-walled, length 0.025 mm.

Male. Unknown.

Distribution. Southeastern Brazil.

Remarks. The type specimens of H. brasiliensis  are females; they clearly differ from the female of H. yapacariensis  in much smaller body (BL 0.50̄ 0.55 mm vs. 0.73 mm), a shorter pronotum (the pronotum in H. yapacariensis  is distinctly elongate) with a different shape of lateral margins, presence of antebasal pronotal pits (only transverse groove in H. yapacariensis  ), the head and pronotum much broader in relation to the elytra, and shorter elytra in relation to their length.

Lectotype designation. Franz (1967) studied five female specimens. One of them is labeled "Typus" ( Fig. 8View FIGURES 6 – 8), but Franz (1967) in the original description did not select any specimen to serve as a name-bearing type (he did not use the term "holotype" or any acceptable equivalent), and the five type specimens should be treated as syntypes. The female labeled as "Typus" ( Figs 1View FIGURES 1 – 3, 8View FIGURES 6 – 8) is here designated lectotype.

Another specimen most likely belonging to H. brasiliensis  was found in NHMW labeled as a paratype of Pseudoeudesis sulcata Franz, 1967  (currently in Afroeudesis (Jałoszyński 2016))  . Both species were collected during the same expedition and the specimen locality labels do not differ; a mislabeling rather than misidentification was suspected by Jałoszyński (2016). This hypothesis was based on the number of specimens ― Franz (1967) stated that the type series of Pseudoeudesis brasiliensis  was composed of five specimens, but only four seemed to be present in NHMW. Therefore, the missing paratype of P. brasiliensis  might have been erroneously labeled by Franz as P. sulcata  and placed in a drawer under this name. However, this hypothesis was proved wrong during the present study; among the four specimens of P. brasiliensis  one turned out to be composed of two beetles embedded in euparal on one plastic rectangle. Therefore, the number of correctly labeled type specimens of P. brasiliensis  in the Franz Collection agrees with that given in the original description, but the one mislabeled as P. sulcata  is a surplus specimen and almost certainly not a paratype.


Naturhistorisches Museum, Wien














Heteroscydmus brasiliensis (Franz)

Jałoszyński, Paweł 2017


Pseudoeudesis brasiliensis

Franz 1967: 668