Diastatotropis humeralis Trýzna & Baňař, 2016

Trýzna, Miloš & Baňař, Petr, 2016, Two new species of Diastatotropis Lacordaire (Coleoptera: Anthribidae) from east Madagascar with a key to species of the genus, Zootaxa 4161 (3), pp. 429-436 : 432-435

Diastatotropis humeralis Trýzna & Baňař sp. nov.

( Figs. 2, 4 , 5 , 6 )

Type locality. East Madagascar, Tamatave province , Andasibe-Mantadia National Park, Analamazaotra forest, 990 m.

Type material. Holotype (female): E MADAGASCAR, TAMATAVE PROVINCE: ‘ Madagascar , 5.ii.2016, / Andasibe-Mantadia N.P., / Analamazaotra forest, / circuit ‘ Indri 2’ // S 18°56´43.9´´, / E 48°25´16.0´´, / 990 m, M. Trýzna leg.’ ( BSNPC) . Paratype (female) (without antennae and anterior legs): ‘E Madagascar / Tamatave distr. / ANDASIBE, 17.–30.xii 2001, J. Horák lgt.’ ( MTDC) . Red label [p] HOLOTYPE / PARATYPE / Diastatotropis / humeralis sp. nov. / M. Trýzna & P. Baňař det., 2016.

Description. Female holotype Measurements (in mm): Total body length—9.14. Head: total length—2.04; length of rostrum—1.22; maximum width of rostrum—1.36; length of eye—0.82; maximum width across eyes— 1.67; minimum distance between eyes—0.78. Antenna: length of segments: II—0.29, III—0.34, IV—0.24, V— 0.24, VI—0.18, VII—0.20, VIII—0.13, IX—0.38, X—0.20, XI—0.33. Pronotum: maximum length—1.96; width at carina—2.53; minimum width—1.67. Elytra: maximum length—4.95; maximum width—3.22.

Colouration of the cuticle of entire body black, proximal part of gula, distal part of rostrum and mandible dark brown. Scape, pedicel and funicle light brown, antennal club dark brown. All femora bright pale brown, only distal part darker; tibiae and tarsomeres I–II dark brown, rest of tarsomeres pale.

Vestiture. Head almost bare, nearly invisible sparse yellowish appressed setae along central longitudinal carina on rostrum. Frons bare, without setae. Lateral sides of rostrum almost bare, only with coarse sculpture, the same sculpture also on vertex. Labrum yellowish with a few longer light setae. Vertex (as in D. lepidus ) with two stripes behind to lateral carinae of rostrum and continued to inner margin of eyes, these narrow stripes rusty-yellow with dense appressed setae. Antennae with indistinct light pubescence, only with very short, soft, sparse setae. Disk of pronotum with fine sculpture, covered with indistinct brown setae, lateral parts of pronotum with more distinct yellowish setae. Basal part of disc with narrow indistinct stripe, pronotal declivity with two triangular spots in lateral part and one narrow stripe in middle covered with rusty-yellow pubescence. Elytra with short dense black setae, each elytron in humeral part with one rusty-yellow spot extended from third to sixth elytral interval. Rest of elytra as well as humeral angle black, without any spots. Scutellum with short rusty-yellowish setae. All legs covered with dense setae. Ventral face of all femora with bright yellow pubescence on distal half and dark brown distal tip. Tibiae covered with dense brown setae appressed in proximal part and subdecumbent in distal part. All tibiae with yellowish stripe in proximal third interrupted in ventral part. Tarsomeres I–II with brownish setae, rest of antennomeres pale. Lateral parts of venter of thorax and abdominal sternites with dense pubescence and short dark setae. Pygidium covered with short dense brown appressed setae, yellowish stripe in central part.

Structure. Head moderately long, rostrum extended apically, weakly depressed in middle, with one longitudinal carina in depression of rostrum, almost reaching anterior margin of eyes, and two short distinct lateral carinae. Ratio of rostrum length to maximum width 0.89. Eyes elliptical, not emarginate, dorsal ocular index 1.75. Ratio of maximum width across eyes to maximum width of rostrum 1.23. Antennae shorter, not reaching posterior margin of pronotum. Pedicel not robust, funicle thin, club widened, antennomere IX and XI longer than wide, antennomere X slightly wider than long. Pronotum slightly transverse, ratio of its length to width at carina 0.77, gradually extending anteriorly to a quarter of its length, here widest, then narrowed to distal part. Dorsal transverse carina almost straight without arch in middle. Lateral carina of pronotum well-developed but short, scarcely reaching to half of pronotum, contact with dorsal transverse carina rounded. Elytra suboval, ratio of the maximum length to maximum width of elytra 1.54.

Male. Unknown.

Etymology. Based on the Latin word humeralis (= shoulder), due to the two well-marked rusty-yellow spots in humeral part.

Collecting circumstances. The type specimen was collected by the authors inside secondary forest at an elevation of 990 metres by sweeping the trunk of an unidentified species of deciduous tree with diameter ca 10 cm ( Fig. 5 ).

Distribution. This species is known only from its type locality in Andasibe National Park, Analamazaotra forest, east Madagascar.

Differential diagnosis. Diastatotropis humeralis Trýzna & Baňař sp. nov. can be distinguished from all other species of the genus mainly by the two unique rusty-yellow spots in the humeral part of the elytra and by characters given in the key.

Key to Diastatotropis species (see also Frieser, 1992)

1 Antennal club slender and cylindrical. Terminal segment elongate-oval, always distinctly longer than wide. Antennomere X as long as wide (or weakly wider than long in females of D. tessellatus )........................................... 2

- Antennal club wide and stout. Terminal segment not longer than wide. Antennomere X approximately twice as wide as long.................................................................................................... 5

2 Sub-basal tubercle of elytra high and obvious............................................................... 3

- Sub-basal area of elytra flat.............................................................................. 4

3 Central longitudinal carina of rostrum long, almost reaching to posterior margin of eyes. Elytral intervals II, IV and VI strongly elevated. Elytra spotted and tessellated.................................................. D. tessellatus Fairmaire

- Central longitudinal carina of rostrum very short, reaching only to middle of rostrum. Elytral intervals flat. Elytra brown, each elytron with large yellow spot behind sub-basal tubercle, reaching from elytral interval I to IX and four small yellow spots on elytral interval II and VIII on median and preapical part...................................... D. elegans Fairmaire

4 Central longitudinal carina of rostrum very short, reaching only to middle of rostrum, depression here shallow. Head and disc of pronotum with fine sculpture. Elytra dark brown with wide humeral yellow part, each elytron with two longitudinal stripes on elytral interval II and VIII reaching to apical part.............................. D. lepidus Trýzna & Baňař sp. nov.

- Central longitudinal carina of rostrum longer, almost reaching anterior margin of eyes, depression here deeper. Head and disc of pronotum with coarse sculpture. Elytra blackish with two unique rusty-yellow spots in the humeral part..................................................................................... D. humeralis Trýzna & Baňař sp. nov.

5 Elytra spotted. Tibia brightly coloured..................................................................... 6

- Elytra differently patterned, not spotted. Tibia dark coloured................................................... 7

6 Rostrum with depression in middle, sides of rostrum with coarse sculpture. Head, pronotum and elytra predominantly black, head and pronotum with two longitudinal whitish stripes. Each elytron with oblique short stripes in humeral parts, rest with numerous more or less irregular delicate whitish spots. All tibia and tarsomere I covered with whitish setae................................................................................................ D. irroratus Lacordaire

- Rostrum without depression in middle, sides of rostrum with fine sculpture. Dorsum of head, pronotum and elytra predominantly yellowish, disc of pronotum with two large black spots. Each elytron with six large black spots. All tibia and tarsomere I covered with yellowish setae.......................................................... D. tigrinus Lacordaire

7 At least pronotum always brightly red..................................................................... 8

- Pronotum always dark, blackish or dark with greenish shine.................................................... 9

8 Head and elytra blackish. Pronotum red, only narrow anterior margin of pronotum blackish. Pronotum with dense sculpture................................................................................... D. rubricollis Fairmaire

- Head, pronotum and elytra red, pronotum and elytra polished with fine pubescence. Pronotum with sparse sculpture................................................................................................ D. ruber Frieser

9 Rostrum without carinnae.............................................................................. 10

- Rostrum with three distinct carinae....................................................................... 11

10 Elytra metallic, shiny. Central part of rostrum with very shallow depression. Slender species, ratio of maximum length of elytra to maximum width 2.0........................................................... D. nitidipennis Waterhouse

- Elytra dark brown to blackish, matte. Central part of rostrum flat, without depression. Stouter species, ratio of maximum length of elytra to maximum width 1.7..................................................... D. planifrons Waterhouse

11 Rostrum distinctly wider than long.......................................................... D. claviger Frieser

- Rostrum distinctly longer than wide..................................................................... 12

12 Rostrum very narrowed in central part, all three longitudinal carinae of rostrum distinct. Antennae continuously extended from antennomere VI (only holotype of female is known). Elytra shorter, ratio of maximum length of elytra to maximum width 1.4. Head, pronotum and elytra predominantly dark with greenish shine........................ D. crassicornis Waterhouse

- Rostrum wide, sides parallel, not narrowed, lateral longitudinal carinae of rostrum indistinct. Funicle thin, antennal club threesegmented. Elytra longer, ratio of maximum length of elytra to maximum width 1.7. Head, pronotum and elytra predominantly black or dark brown, without shine.................................................... D. olivaceus Waterhouse

Figures

FIGURE 5. Microhabitat of the type locality of Diastatotropis humeralis Trýzna & Baňař sp. nov. in Andasibe – Mantadia NP, Analamazaotra forest. Black arrow indicates the position of siting holotype specimen.

FIGURE 6. Type localities of Diastatotropis lepidus Trýzna & Baňař sp. nov. and D. humeralis Trýzna & Baňař sp. nov.

FIGURES 1 – 4. 1, 3, Diastatotropis lepidus Trýzna & Baňař sp. nov., holotype female; 2, 4, Diastatotropis humeralis Trýzna & Baňař sp. nov., holotype female; 1 – 2, dorsal habitus; 3 – 4, head, dorsal view. Scale bars in mm.