Klimaszewskia Yin & Zhang, 2021

Yin, Zi-Wei & Zhang, Wen-Xuan, 2021, Klimaszewskia, a new genus of the tribe Tyrini from the Oriental region (Coleoptera Staphylinidae: Pselaphinae), Zootaxa 4942 (4), pp. 592-598 : 593-595

Klimaszewskia Yin & Zhang , gen. nov.

Type species. Klimaszewskia punctata sp. nov. (here designated).

Diagnosis. Head with nude vertexal foveae, frontal fovea punctiform; maxillary palpus ( Fig. 2B, H ) elongate, palpomeres 2–4 basally pedunculate, palpomere 4 broadest in basal half (approximately at basal 2/5), with mesal margin expanded, lateral margin straight to slightly sinuate, with distinct palpal cone at apex. Pronotum with median and lateral antebasal foveae connected by deep antebasal sulcus. Each elytron with two large basal foveae and single subbasal fovea, discal stria shallow and short. Visible tergite 1 (IV) twice as long as tergite 2 (V) at mid-length; tergite 1 (IV) and sternite 2 (IV) with deep setose sulcus at base. Legs with pro- and mesotarsomere 2 as long as 3, metatarsomere 2 slightly longer than 3.

Description. Tyrine of small to medium size, body length 1.5–2.3 mm. Head with frontal rostrum moderately long, relatively narrow, formed by slightly prominent antennal tubercles; vertexal foveae (dorsal tentorial pits) nude, distinctly larger than punctiform frontal fovea; lacking ocular-mandibular carina; with 11 antennomeres, antennomere 1 shorter than antennomeres 2 and 3 combined, club formed by three apical antennomeres; lacking postantennal notch at anterolateral margin; lacking lateral postantennal pit; maxillary palpus with small, subrectangular palpomere 1, palpomere 2 pedunculate in basal half, gradually widening to apical 2/5 and then narrowing again to apex, palpomere 3 pedunculate for short distance at base, widening to apical 1/3 and with truncate apex, palpomere 4 enlarged and elongate, with narrow stem at base, mesal margin strongly expanded at basal 2/5, lateral margin straight to slightly sinuate, evenly narrowing from basal 2/5 toward apex, with short but distinct palpal cone; gula almost flat, small gular foveae (posterior tentorial pits) close in shared impression.

Pronotum subglobose, broadest at apical 2/5, disc moderately convex; median antebasal fovea punctiform and nude, lateral antebasal foveae relatively small and setose, connected by complete antebasal sulcus; longitudinal hypomeral carina curved, present only in basal half; prosternum with lateral procoxal foveae, area surrounding foveae densely setose.

Elytra subtrapezoidal, each elytron with two large, setose basal foveae and single subbasal fovea; discal stria short and shallow, extending posteriorly from outer basal fovea to basal fourth of elytral length.

Mesoventrite with median mesoventral foveae moderately separated, with large, setose lateral mesoventral foveae deeply forked internally, one pair of thin admesal carinae present, with clear anterolateral mesoventral foveae approximately 1/4 size of lateral foveae; with large, setose lateral mesocoxal foveae; single median metaventral fovea large and densely setose, posterior margin of posterior intercoxal process broadly impressed at middle.

Legs elongate, lacking distinct cuticular features; all femora moderately thickened, broadest at middle; mesotibia slightly curved at apical third, pro- and metatibia straight; tarsomere 1 short, tarsomeres 2 and 3 elongate, pro- and mesotarsomere 2 as long as 3, metatarsomere 2 slightly longer than 3; pretarsal claws of equal size, curved.

Abdomen with tergites moderately convex; tergite 1 (IV) twice as long as tergite 2 (V) at mid-length, with broad, setose basal sulcus, tergite 2 (V) 1.5 times as long as tergite 3 (VI), tergites 3 and 4 (VII) subequal in length; tergites 1–5 (IV–VIII) each with one pair of basolateral foveae, tergites 2–5 (V–VIII) lacking basal sulcus. Visible sternite 2 (IV) as long as sternites 3 and 4 (V and VI) combined, with broad, deep basal sulcus, lacking mediobasal foveae, with one pair of small basolateral foveae; sternites 3–5 (V–VII) subequal in length at mid-length, lacking foveae.

Male lacking obvious sexual characters, mesotibia with small apical tubercle. Aedeagus with large diaphragm; median lobe with basal capsule as long as apical portion; endophallus well-developed; parameres reduced and appear as single membranous structure. Female genital complex composed of symmetrical weakly sclerotized structure.

Comparative notes. Using the key to world genera of Tyrini by Hlaváč & Chandler (2005), Klimaszewskia gen. nov. is keyed out at couplet 24, together with Tyrogatunus Park which contains a single species from Panama. These two genera share the antennomere 1 shorter than antennomeres 2 and 3 combined, presence of the small frontal fovea, presence of antebasal sulcus of the pronotum that connects the small, nude median and larger, setose lateral antebasal foveae, and the long first visible tergite. They can be readily separated primarily by the different form of maxillary palpomere 4. In Tyrogatunus there is a well-defined longitudinal sulcus on the dorsal surface of the symmetrical palpomere 4 ( Park 1942), which is lacking in the new genus. Otherwise Tyrogatunus also has distinct spination of the legs in both sexes, which is absent in Klimaszewskia gen. nov.

Globally, Klimaszewskia gen. nov. also shares with more than a dozen genera the similarly elongate maxillary palpi; it may be separated from them by the following characteristics:

- from the Neotropical Phalepsus Westwood by the non-globose body form, relatively much shorter narrowed apical portion of maxillary palpomere 4, and long first visible tergite;

- from the Neotropical Lethenomus Raffray by the maxillary palpomere 4 asymmetrically expanded near the base and with a narrowed apical portion, and long first visible tergite;

- from the Neotropical Tyropsis Saulcy by the presence of a frontal fovea and antebasal sulcus of the pronotum, asymmetric maxillary palpomere 4, and long first visible tergite;

- from the Neotropical Neotyrus Raffray by the presence of a frontal fovea, pronotum lacking median tubercle near the base, and with an antebasal sulcus, and elytra not carinate;

- from the Afrotropical Franziotus Leleup by the shorter maxillary palpomere 3, palpomere 4 broadest near the base (broadest at apex in Franziotus ), presence of an antebasal sulcus of the pronotum, and much longer elytra (elytra strongly shortened and constricted at the base in Franziotus );

- from the Holarctic and Oriental Tyrus Aubé by the relatively much longer and asymmetric maxillary palpomere 4, lack of long discal striae of the elytra, and long first visible tergite;

- from the Northeast Palaearctic and Oriental Tyrodes Raffray by the relatively much longer and asymmetric maxillary palpomere 4 broadest in basal half, and lateral margin of scape not angulate in the male;

- from the Palaearctic and Oriental Tyrinasius Kurbatov by the asymmetric and relatively much longer maxillary palpomere 4, presence of an antebasal sulcus of the pronotum, and broad elytral bases (the elytra are strongly constricted at the bases in Tyrinasius );

- from the Oriental Megatyrus Hlaváč & Nomura by the much smaller body size, less robust body form, shorter pedunculate portion of maxillary palpomere 3, and presence of elongate apical narrowed portion of maxillary palpomere 4.

- from the Australian Gerallus Sharp , Rytus King and Tasmanityrus Chandler by the presence of a frontal fovea and an antebasal sulcus of the pronotum, and asymmetric maxillary palpomere 4; from Gerallus also by the maxillary palpomere 4 broadest in basal half. The large genus Rytus (most species remain undescribed, see Chandler 2001) have a few species of which the form of maxillary palpomere 4 resembles that of the new genus (Chandler pers. comm.). However, other characters of the head and pronotum that separate these two genera appear to be quite consistent;

- from the Australian Tyrogetus Broun and Chasoke Chandler by the slightly more medially placed vertexal foveae, relatively shorter basal pedunculate portion of maxillary palpomere 3, straight lateral margin of maxillary palpomere 4 (apical portion angled laterally in Tyrogetus so the lateral margin appears to strongly curved), and presence of an antebasal sulcus of the pronotum; from Chasoke also by the much less elongate antennal clubs and legs, much shorter elytra that lack distinct discal striae, and long first visible tergite.

Distribution. Indonesia and Nepal.

Etymology. The new generic name is in honor of Jan Klimaszewski (Quebec, Canada), a renowned specialist in staphylinid systematics as well as a distinguished editor of Zootaxa. The gender of the name is feminine.

Figures

FIGURE 2. Diagnostic characters of Klimaszewskia species (A–G. K. punctata sp. nov. H, I. K. sp.). A. Head and pronotum. B, H. Left maxillary palpus. C. Antennomeres 8–11. D. Meso- and metaventrite. E–G. Aedeagus, in lateral (E), and ventral (F, G) view. Scale bars: 0.2 mm in A, C, D; 0.1 mm in B, E–I.