Laccophilus stastnyi, Hájek & Brancucci, 2015

Hájek, Jiří & Brancucci, Michel, 2015, A taxonomic review of the Oriental Laccophilus javanicus species group (Coleoptera: Dytiscidae), Raffles Bulletin of Zoology 63, pp. 309-326 : 324

Laccophilus stastnyi , new species

( Figs. 14 , 32 )

Type locality. Malaysia, Sarawak, Bako National Park , ca. 01°43′N 110°27′E.

Material examined. Holotype male, labelled: Malaysia, Sarawak / BAKO NP / 27.-28.5.[20]03 / J. Šťastný lgt. ( NMPC). Paratypes: 1 male, 1 female, same label data as holotype ( JSCL) .

Additional non-type material. MALAYSIA: Sarawak: 4 females, Kuching env., Bako NP, 21 February 1993, coll. M. Jäch ( NHMW, NMPC) .

Diagnosis. Smaller, oblong oval species (body length 3.5–3.6 mm). The new species is very similar to Laccophilus mahakamensis and we cannot exclude the possibility that it represents only an aberrant population of this species. Laccophilus stastnyi differs from that species in the somewhat reduced testaceous pattern of elytra, but predominantly in the shape of the apical part of the median lobe, the ventral outline of which is in lateral view distinctly less sinuous with a shortly pointed tip.

Description. Colouration: Head and pronotum testaceous, elytra brownish black with testaceous pattern consisting of relatively narrow sinuous subbasal transverse band separated from base, large preapical spot (preapical transverse band interrupted in sutural area), and an indistinct apical spot ( Fig. 14 ). Appendages and ventral part testaceous.

Surface structures and sculpture: Head reticulation simple, composed of large irregular polygonal meshes, which are superficially impressed. Frons between eyes, and clypeus with several large punctures. Reticulation of pronotum similar to that of head, but meshes somewhat larger. Pronotum along margins with numerous large setigerous punctures. Reticulation of elytra simple, consists of large polygonal meshes similar to that of pronotum; meshes mostly complete, sometimes with a puncture inside. Sutural row of punctures reduced to few punctures; discal and lateral rows of punctures present, but barely perceptible. Ventral part reticulated with fine meshes. Prosternal apophysis short and lanceolate. Abdominal ventrites with numerous oblique grooves and several large setigerous punctures, lateral margin bordered; apical ventrite rounded posteriorly, on disc with several setigerous punctures and grooves. Male pro- and mesotarsomeres 1–3 weakly dilated with a bundle of adhesive setae on ventral side. Claws of pro- and mesotarsi simple and equal.

Male genitalia: Median lobe of aedeagus in lateral view as in Fig. 32 .

Female genitalia: Similar to male; pro- and mesotarsomeres not dilated.

Variability. Measurements (N= 7): Body length 3.5–3.6 mm (mean value 3.5 mm, holotype 3.5 mm); width 2.0– 2.1 mm (mean value 2.1 mm, holotype 2.0 mm).

Etymology. The new species is dedicated to its collector, Jaroslav Šťastný (Liberec, Czech Republic), a specialist on Dytiscidae .

Distribution. So far known only from the type locality in Bako National park, Sarawak, Malaysia ( Fig. 40 ).

Figures

Figs. 10–17. Habitus of Laccophilus: 10, L. mahakamensis; 11, L. mazzoldii, new species; 12, L. nusatenggaraensis, new species; 13, L. schillhammeri, new species; 14, L. stastnyi, new species; 15, L. tobaensis; 16, L. tonkinensis; 17, L. wittmeri. Scale bar = 1 mm.

Figs. 18–35. Median lobe in lateral view: 18, Laccophilus aurofasciatus; 19, L. auropictus; 20, L. ceylonicus; 21, L. elegans; 22, L. girardi; 23, L. hendrichi, new species; 24, L. jaechi, new species; 25, L. javanicus; 26, L. kalimantanensis, new species; 27, L. komareki, new species. 28, L. mahakamensis; 29, L. mazzoldii, new species; 30, L. nusatenggaraensis, new species; 31, L. schillhammeri, new species; 32, L. stastnyi, new species; 33, L. tobaensis; 34, L. tonkinensis; 35, L. wittmeri. Scale bar = 0.5 mm.

Figs. 40–41. Distribution of the species of the Laccophilus javanicus group