Horniella sabahensis Zhang & Yin, 2021

Zhang, Wen-Xuan, Hu, Fang-Shuo & Yin, Zi-Wei, 2021, Six new species of Horniella Raffray from the Oriental region (Coleoptera, Staphylinidae, Pselaphinae), ZooKeys 1042, pp. 1-22 : 1

publication ID

https://dx.doi.org/10.3897/zookeys.1042.66576

publication LSID

lsid:zoobank.org:pub:B0B0F76E-8950-4A0A-B45D-701730486B56

persistent identifier

https://treatment.plazi.org/id/EC5C6E94-0D2A-461D-8EA7-1C750F093066

taxon LSID

lsid:zoobank.org:act:EC5C6E94-0D2A-461D-8EA7-1C750F093066

treatment provided by

ZooKeys by Pensoft

scientific name

Horniella sabahensis Zhang & Yin
status

sp. nov.

Horniella sabahensis Zhang & Yin View in CoL sp. nov. Figures 7A View Figure 7 , 8 View Figure 8

Type material.

Holotype: East Malaysia: ♂, 'Borneo: Sabah, Batu Punggul Resort, primary forest, 24.vi.-1.vii.96, Kodada lgt. / vegetation debris and forest floor litter accumulated around large trees near river.' (MHNG).

Diagnosis.

Male. Head longer than wide, anterolateral genal projections weakly developed, anterior margin of projection oblique; scape lacking expansion at lateral margin, antennomeres 9-11 moderately enlarged, forming distinct club. Pronotum rounded at lateral margins. Profemur with two tiny ventral spines near base; metatibia with preapical triangular denticle. Tergite 1 (IV) with median carina extending posteriorly for approximately 3/4 of tergal length, lacking discal carinae, tergite 2 (V) with short median carina. Aedeagus with slightly asymmetric median lobe, apical portion of median lobe narrowed, apex truncate in dorso-ventral view; endophallus lacking sclerite, composed of elongate membranous structure with many small denticles.

Description.

Male. Body reddish-brown, length 3.41 mm. Head (Fig. 8A View Figure 8 ) longer than wide, HL 0.68 mm, HW 0.59 mm; anterolateral genal projection weakly developed, anterior margin of projection oblique; antenna 1.96 mm long, scape lacking expansion at lateral margin, antennomeres 2-8 slightly elongate or moniliform, distinct club formed by apical three enlarged antennomeres, antennomere 11 largest, slightly shorter than antennomeres 9 and 10 combined; indistinct lateral postantennal pits present; eyes prominent, each composed of approximately 40 large facets, usual area of ocular canthus only slightly prominent (Fig. 8B View Figure 8 ).

Pronotum distinctly longer than wide, PL 0.71 mm, PW 0.6 mm; widest at middle; lateral margins rounded; disc moderately convex, finely punctate, with distinct median antebasal and lateral antebasal foveae connected by complete transverse antebasal sulcus.

Elytra much wider than long, EL 0.77 mm, EW 1.2 mm; each elytron with two large, setose basal foveae; discal striae extending from outer basal foveae to apical 2/3 of elytral length.

Legs elongate; protrochanter (Fig. 8C View Figure 8 ) simple, profemur (Fig. 8C View Figure 8 ) with two tiny ventral spines at base, protibia (Fig. 8D View Figure 8 ) simple; mesotrochanter, mesofemur (Fig. 8E View Figure 8 ) and mesotibia (Fig. 8F View Figure 8 ) simple; metatibia (Fig. 8G View Figure 8 ) with distinct apical triangular denticle.

Abdomen slightly longer than broad, broadest at lateral margins of tergite 1 (IV), AL 1.25 mm, AW 1.16 mm; tergite 1 (IV) largest, slightly shorter than tergites 2 and 3 (V and VI) combined, with median carina extending to near basal 3/4 of tergal length, lacking discal carinae, tergite 2 (V) with median carina extending to near basal 1/4 of tergal length, tergites 2-4 (V-VII) each with small basolateral foveae. Sternite 2 (IV) with broad basal sulcus, lacking mediobasal foveae, basolateral foveae developed as large cuticular pockets, with two pairs of antebasal nodules, sternites 3-5 (V-VII) with basolateral foveae, one median and two lateral nodules, sternite 7 (IX) nearly oval, with well-sclerotized apical half and less sclerotized basal half.

Aedeagus (Fig. 8H-J View Figure 8 ) 0.57 mm long, with slightly asymmetric median lobe, apical part of median lobe narrowed, apex broadly truncate in dorso-ventral view; endophallus lacking strongly sclerotized structures, composed of broad, elongate membrane with numerous small denticles.

Female. Unknown.

Comparative notes.

Horniella sabahensis sp. nov. is placed as a member of the H. hirtella group. Males of this species share with H. prolixo Yin & Li from Thailand the weakly developed anterolateral genal projections, lack of an expansion at the lateral margin of the scape, and a moderately expanded preapical portion of the metatibia. They can be best separated by the larger body size (3.41 mm vs 2.95-3.02 mm), tergite V with a short median carina (lacking in H. prolixo ), as well as the much narrower apex of the aedeagus of the new species.

Distribution.

East Malaysia: Sabah.

Etymology.

The new species is named after its type locality, Sabah, East Malaysia.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Horniella