Megalopinus hamiguitanensis, Mainda, 2025

Megalopinus hamiguitanensis nov.sp.

urn:lsid:zoobank.org:act:

T y p e m a t e r i a l: ϐ Holotype: white label " PHILIPPINES, Mindanao Isl., Davao Oriental prov., Mt. Hamiguitan, Research Base , 390-440 m, sifting sekond. (sic!) forest, N6°44’07,44” E°12608’30;14”, 16-17.ii.2017. A. Damaška " / red label "ϐ HOLOTYPE, Megalopinus hamiguitanensis nov. sp., design. Mainda, 2025" (NMPC).

D e s c r i p t i o n: Measurements of the holotype: BL: 2.17 mm, DE: 0.45 mm, EL: 0.60 mm, EW: 0.85 mm, FBL: 1.40 mm, HW: 0.78 mm, PL: 0.50 mm, PW: 0.65 mm, SL: 0.47 mm.

Habitus as in Fig. 2 View Figs 1-8 . Dark brown, without microsculpture; elytra with four rows of punctures and a few punctures in sutural third; antennae and legs orange-brownish, metafemora indistinctly bicolored.

Head 0.92 times as broad as elytra, frons coarsely punctured, shiny.

Pronotum 1.3 times as broad as long, broadest in anterior third; with four transverse rows of coarse and deep punctures; one large puncture in posteriolateral third on both sides. Each side of pronotum with four small denticles.

Elytra ( Fig. 4 View Figs 1-8 ) 1.42 times as broad as long; humeral calli prominent. Deep, narrow punctate (str) longitudinal impression on both sides of suture. Punctures on left elytron: slr (4), shr (7), dsr (4), ssr-c (4), str (10); punctures on right elytron: slr (5), shr (7), dsr (5), ssr-c (6), str (10). Broadest in middle; lateral margins convexly rounded anteriorly and posteriorly.

Abdomen narrower than head, shiny, with distinct paratergites. Basolateral striae of tergite

V extending to middle of tergite; tergite VII with membranous fringe at posterior margin (metathoric wings fully developed).

Male: Antennomere XI 3.00 times as long and the same width as antennomere X. Sternite and tergite VIII shallowly impressed at posterior margin; sternite IX spatula-shaped; tergite X shiny, very sparse and widely punctured. Aedeagus ( Fig. 7 View Figs 1-8 ) slender, with two falcate internal sclerites and two proximal fields of indistinct denticles; parameres with six apical setae.

Female: Unknown.

D i f f e r e n t i a l d i a g n o s i s: Megalopinus hamiguitanensis nov.sp. is related to some smaller, unicolored brown species of the M. acutangulus group with a punctate sutural third of elytra and relatively short lateral lines on tergite V. The species is distinguished from M. malayanus PUTHZ, 2012 and M. zwicki PUTHZ, 2012 by the unicolorous elytra, presence of a sutural row on each elytron and by the inner structure of the aedeagus. It is separated from M. ingeae MAINDA, 2022 by less distinctly bicolored metafemora; unicolorous elytra; antennomere XI only 3 times instead of 5 times as long and the same length instead of 1.4 times as broad as antennomere X and by a thinner median lobe and slightly different internal structure of aedeagus. From M. rafflesi PUTHZ, 2012 , the new species is directly separated by a punctate sutural third of elytra.

D i s t r i b u t i o n: Sofar, M. hamiguitanensis nov.sp. is only known from the foothills of the UNESCO World Heritage Site Mount Hamiguitan Range Wildlife Sanctuary on Mindanao Island in the southern Philippines.

E t y m o l o g y: The species epithet is a toponym referring to the type locality, Mt. Hamiguitan on Mindanao Island, Philippines.