Diastatotropis lusti Trýzna, Blažej & Rakotonirina, 2024

Trýzna, Miloš, Blažej, Lukáš & Rakotonirina, Jean Claude, 2024, Two new species of Diastatotropis Lacordaire from protected areas in central and east Madagascar (Coleoptera: Anthribidae), Zootaxa 5536 (2), pp. 291-304 : 292-296

Diastatotropis lusti Trýzna, Blažej & Rakotonirina sp. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:7C89F230-C60A-45B1-B4FF-A7DC00F25549

( Figs 1–13 )

Type locality. E Madagascar, Fianarantsoa prov., natural forest in Ranomafana National Park , S 21°15´03.4´´; E 47°24´26.0´´, 1189 m a.s.l.

Type material. Holotype (male) ( Figs 1–5 ): ‘E MADAGASCAR, 16.ii.2010, / Ranomafana N.P., 1189 m, / S 21°15´03.4´´; E 47°24´26.0´´, / M. Trýzna leg. [p]’ ( MMBC). Allotype (female): ‘ MADAGASCAR / Fianarantsoa prov. / Ranomafana env. / 28.1.-6.2.1995 / Ivo Jeniš leg. [p]’ ( MTDC). Paratype (male): the same data as holotype ( MTDC). Red label [p] HOLOTYPE / ALLOTYPE / PARATYPE / Diastatotropis / lusti sp. nov. / M. Trýzna det., 2024.

Diagnosis. Small-sized species (about 6.0 mm). Rostrum with only two distinct longitudinal carinae, lacking central carina. Dorsum of rostrum flat, with coarse sculpture. Antennal club slender and oblong, terminal segment elongate-oval, distinctly longer than wide. Elytra convex, without distinct sub-basal tubercles. Pronotum with one central and two lateral longitudinal yellow stripes; each elytron with one longitudinal yellow stripe interrupted in the central part. This stripe is in the basal half of the fourth elytral interval, in the apical half obliquely forming from the fourth to the first elytral interval.

Description. Holotype (male) ( Figs 1–5 ). Measurements (in mm):Total body length—6.05.Head:total length— 1.30; length of rostrum—0.75; maximum width of rostrum—0.98; length of eye—0.65; maximum width across eyes—1.28; minimum distance between eyes—0.55. Antenna: length of segments: II—0.20, III—0.21, IV—0.19, V—0.14, VI—0.13, VII—0.10, VIII—0.09, IX—0.30, X—0.16, XI—0.31, width of segment IX—0.14. Pronotum: maximum length—1.33; width at carina (= maximal width in this case)—1.85; minimum width—1.13. Elytra: maximum length—3.25; maximum width—2.05. Pygidium: maximum length—0.50; maximum width—0.74.

Coloration of the cuticle of entire body dark, nearly black, rostrum including scrobes and mandibles, and abdominal ventrites brown. Basal part of head, pronotum and elytra black. All antennomeres and legs dark brown. Labrum yellow.

Vestiture. Head with only indistinct sparse yellowish appressed setae in central part of rostrum. Frons with only very short and almost invisible setae in central part. Labrum yellowish with a few longer light setae. Vertex with two stripes behind lateral carinae of rostrum and continued to inner margin of eyes, these stripes yellow with very dense appressed setae. Lateral sides of rostrum almost bare, with yellow stripes under lower edge of eyes. Antennae with indistinct light pubescence, only with very short, soft, setae. Pronotum with one slender and two wider distinct longitudinal stripes posteriorly extended to transverse pronotal carina, the same on pronotal declivity. All stripes covered with dense yellow setae. Each elytron with one longitudinal yellow stripe interrupted in the central part. This stripe is in basal half on the fourth elytral interval, in the apical half obliquely forming from the fourth to the first elytral interval. Next yellow stripe on ninth elytral interval, also widely interrupted in middle. Rest of elytra, mainly disc and lateral part, with only fine and sparse yellow pubescence. Humeral angle lacking yellow colouration, with only sparse short yellow setae. Scutellum with dense yellow setae. All legs covered with dense fine brownish setae. Tibiae covered with dense indistinct brown setae appressed in proximal part and subdecumbent in distal part. All tibiae on dorsal side with only indistinct small spot of light-coloured setae in proximal third. Tarsomeres with brownish setae. Lower side of the body with sparse pubescence of short yellow setae. Pygidium covered with only short and indistinct dense yellowish appressed setae.

Structure. Head ( Fig. 2 ) rather shorter, rostrum wider than long, ratio of rostrum length to maximum width 0.77. Rostrum almost flat in lateral view. Lateral sides of rostrum weakly extended apically. Rostrum with only two lateral longitudinal carinae, lacking central carina. Lateral carinae not extended distal part of rostrum and reaching anterior margin of eyes. Dorsum of rostrum with only shallow depression. Whole dorsal part of head coarsely sculptured. Eyes oval, not emarginate, dorsal ocular index 1.51. Ratio of maximum width across eyes to maximum width of rostrum 1.31. Antennae ( Figs 1, 4 ) shorter, reaching only to dorsal transverse carina of pronotum. Scape and pedicel approximately twice as thick as the funicle, club widened, antennomeres IX and XI about twice longer than wide, X slightly longer than wide.

Pronotum ( Fig. 3 ) slightly transverse, ratio of its length to maximum width 0.72, the widest in dorsal transverse carina, then narrowed to distal part. Disc of pronotum convex, without any imprint. Dorsal transverse carina of pronotum sinuated, not interrupted in middle. Lateral carinae of pronotum very short, not strongly indicated, not reaching half of length of pronotum, widely rounded at contact with dorsal transverse carina.

Elytra ( Figs 1, 5 ) rather short, without sub-basal tubercles, ratio of the maximum length to maximum width of elytra 1.59. Elytral intervals completely flat, dorsal punctures distinct, their diameter approximately the same as distance between individual punctures.

Claws without teeth. Pygidium transverse, ratio of the maximum length to maximum width 0.68.

Genitalia and associated structures. Male ( Figs 6–9 ). Aedeagus ( Figs 6–7 ) rather elongated, pedon and tectum slender. Tectum with pointed projection apically, pedon broadly rounded apically. Apodemes of aedeagus long, parallel. Bridge of aedeagus weakly developed. Tegmen ( Fig. 8 ) rather long and slender, basal piece strongly sclerotized. Apodeme of tegmen straight, wide, distinctly shorter than body of tegmen. Tegminal plate slender, almost triangular, with narrow apical part. Apex of tegmen slender, with distinct longer setae. Segment VIII ( Fig. 9 ) moderately sclerotized, approximately as long as wide, anterior margin of tergite widely rounded. Sternite IX (= spiculum gastrale, Fig. 9 ) with symmetrical short arms, apodeme curved.

Female ( Figs 10–13 ). Ovipositor ( Fig. 10 ) wide and short, lateral rods diverging. Hemisternites ( Fig. 11 ) unarmed, without distinct toothed plates, with numerous setae apically. Sternite VIII ( Fig. 12 , left) transverse, with anterior margin almost straight, only slightly convex in middle, and with sclerotized apodeme. Tergite VIII ( Fig. 12 , right) as wide as long, its anterior margin distinctly trilobed. Both segments with numerous setae apically. Shape of spermatheca as in Fig. 13 .

Etymology. Patronym, dedicated to our colleague and friend Zdeněk Lust (Rožany, Czech Republic).

Collecting circumstances ( Figs 14–15 ). Diastatotropis lusti was found in Ranomafana National Park located ca. 40 km (by air) NW of Fianarantsoa town, Fianarantsoa province. Ranomafana N.P. is covered with medium altitude moist evergreen forest, dominated by the humid climate with no typical dry season. The detailed description of the area is presented by Goodman et al. (2018a).

Two male specimens of D. lusti were collected in a slightly disturbed place on the edge of the primary forest at elevation 1189 m a.s.l. These males were caught climbing on the central wall of an installed Malaise trap during the day. No other specimens of this species were found in the collection container of the trap or in the immediate vicinity. The last specimen, a female, was collected in ‘Ranomafana env.’. According to the collector, the specimen was obtained by collecting along National Road (RN) 25, which forms the boundary of the National Park. A single specimen was obtained by beating of vegetation, mainly bushes and branches of low trees (Ivo Jeniš, pers. comm., 2000).

Distribution. E Madagascar, Fianarantsoa province. The species is only known from the type locality Ranomafana National Park ( Fig. 28 ).

Differential diagnosis. Diastatotropis lusti belongs to a group of species with antennal club slender and cylindrical, antennomere X as long as wide, and terminal segment elongate-oval, always distinctly longer than wide. Rostrum with only two lateral carinae. Oblique stripes are prominent on the elytra, that converge apically. The species is distinguished from other species by the shape of the pronotum (in dorsal view), which is very protruding laterally in the area of the dorsal transverse carina. It is also characterized by very short lateral carinae of pronotum, which are not strongly indicated and not reaching half of length of pronotum. Pygidium in both sexes lacks a longitudinal stripe of light-coloured setae.

Figures

FIGURE 28. Type localities of Diastatotropis lusti and D. petulae.

FIGURES 1–5. Diastatotropis lusti, holotype male; 1, habitus in dorsal view; 2, head; 3, pronotum; 4, right antenna; 5, habitus in lateral view. Scale bars in mm.

FIGURES 6–9. Diastatotropis lusti, paratype male, terminalia; 6, aedeagus in dorsal view; 7, aedeagus in lateral view; 8, tegmen in ventral view; 9, segment VIII and sternite IX (= spiculum gastrale) in dorsal view. Scale bars in mm.

FIGURES 10–13. Diastatotropis lusti, allotype female, terminalia; 10, ovipositor in ventral view; 11, apex of ovipositor (hemisternites) in ventral view; 12, sternite VIII (left) and tergite VIII (right) in ventral view; 13, spermatheca. Scale bars in mm.

FIGURES 14–15. Ranomafana National Park, overall view of collecting site of Diastatotropis lusti.