Antsirabenus granulatus, Heiss, 2008

Heiss, E., 2008, A new genus and two species of apterous Mezirinae from Madagascar (Heteroptera, Aradidae), Linzer biologische Beiträge 40 (1), pp. 303-309 : 304-306

Antsirabenus granulatus nov.sp. ( Fig. 1, 3, 4, 6-10 , photo 1, 2)

M a t e r i a l e x a m i n e d: Holotype male, Madagascar, env. Chutes de l’ Onive NW Antsirabe, 15.IX.1995 G. Carlo leg. ( CEHI); paratypes: two females collected with holotype.

D i a g n o s i s:Distinguished from the second new species of this genus A. setulosus nov.sp. by much larger size, antennal segment II longer than III, different size and shape of anterolateral expansion of pronotum, less transverse scutellum and straight not sinuate lateral margins of deltg V-VII ( Fig. 1, 2, 5, 6 ).

D e s c r i p t i o n: Male, apterous, body and appendages densely beset with setigerous round tubercles; colour reddish brown with lighter antennae.

H e a d: Slightly longer (from apex of genae to posterior margin of granulated vertex) than width across eyes (43/41); genae long and contiguous in front of clypeus, apices diverging anteriorly and reaching beyond antennal segment I; antenniferous lobes bent anterolaterally; antennae 1.46 ✕ as long as width of head (60/41), antennal segments of subequal length, II slightly longer than III, relative length of I:II:III:IV = 15:15:14:16; eyes globular fully exposed; postocular lobe with a small acute laterally projecting tubercle, its apex not reaching outer margin of eyes, then strongly converging posteriorly; vertex dorsally rounded with an ovate smooth depression laterad on either side.

P r o n o t u m:Distinctly transverseand2.6xaswideaslong (60/23); lateral margins with a large slightly reflexed widely rounded expansion along basal 1/2, the remaining margin straight and diverging posteriorly; disk transversely raised posteriorly, sloping toward collar with two larger ovate elevations medially and two smaller longer but lower ones sublaterally, surface depressed between median elevations with a median longitudinal groove flanked by a row of granules and a smooth ovate depression laterally, the latter delimited by the median elevations; posterior margin slightly convex.

S c u t e l l u m: Semicircular 2.5 ✕ as wide as long (40/16); disk widely elevated at middle, depressed posterolaterally; lateral margins granulate and carinate.

M e t a n o t u m: Developed as trapezoidal sclerites laterally of scutellum, their posterior margins sinuate and not exceeding the scutellum; lateral margins converging anteriorly with a reflexed rounded lateral expansion, convex posterolaterally; disk with a longitudinal ridge at middle; lateral metathoracic scent gland canals long and curved, the cleft opening is anterolaterally visible from above (fig. 1, 3).

A b d o m e n:Tergalplatesubrectangular consisting of fused mediotergites (mtg) I-VI; mtg I medially slightly depressed and less granulate, lateral margins with a longitudinal ridge; posterior margin laterad of median depression sinuate, its surface is disticly higher than that of the adjacent depressed mtg II which has an inverted T-shaped flat elevation medially; posterior border between mtg II and III marked by a thin depressed line; mtg IV+V raised medially bearing the dorsal scent gland scars; deltg II+III fused, lateral margins of deltg II-VI straight, the posterolateral angles feebly produced; that of deltg VII basally straight then with a subtriangular posteriorly directed lobe (fig. 6). Ventral side with pro- meso- and metasternum fused; sternite VII of male with a conspicuous glabrous tubercle; spiracles II-VII ventral, VIII lateral on paratergite VIII and visible from above.

G e n i t a l i c s t r u c t u r e s: Pygophore subglobose, attenuated posteriorly; parameres hook like as fig. 7-10.

F e m a l e: Generally as male but of larger size, tergite VII raised medially with two distinct round granulate elevations, depressed laterad, ptg VIII with acute apex, shorter than tricuspidate tergite IX.

M e a s u r e m e n t s: Length 9.0 mm; width of pronotum (at expansion) 3.0 mm; width across metanotum 3.9 mm; width of abdomen 4.4 mm. Females: Length 10.5 and

10.8 mm; ratio length of antennae/width of head 1.46/1.42; width of pronotum 3.7/ 3.85 mm, ratio width/length 2.8/2.9; scutellum ratio width/length 2.6/2.6; width across metanotum 4.7/ 4.8 mm; width of abdomen 5.6/ 5.8 mm respectively.

E t y m o l o g y: Referring to the conspicuous granulation of the body.

D i s t r i b u t i o n: Only known to date from the type locality in Central Madagascar near Antsirabe and is most probably endemic.

Figures

Fig. 1-10: Antsirabenus nov.gen. 1, 3, 4, 6-10 A. granulatus nov.sp.; 2, 5 A. setulosus nov.sp.; (1, 2) paratypes female, dorsal view; (3) metathoracic scent gland canal, lateral view; (4) claw; (5, 6) outline of abdomen of males; (7-10) right paramer in different positions (10 = ventral side). Abbreviations: (em) median elevation of metanotum; (pa) setiform parempodia; (ps) pseudopulvilli; (sc) metathoracic scent gland canal. Scale: Fig. 1-3, 5, 6 = 1 mm; fig. 7-10 = 0.1 mm.