Stenolemus annulatus, Mukherjee, Paramita, Ambrose, Dunston P., Hassan, M. E. & Biswas, B., 2015

Mukherjee, Paramita, Ambrose, Dunston P., Hassan, M. E. & Biswas, B., 2015, A new species of Stenolemus Signoret (Hemiptera: Heteroptera: Reduviidae: Emesinae) from India, Zootaxa 3904 (1), pp. 116-122 : 117-121

Stenolemus annulatus sp. nov.

( Figs. 1 –12)

Description. Macropterous; body covered with long, luteous, curved pubescence.

Colour. General colour creamy white, pattern elements brownish yellow to dark brown; head creamy white with fuscous markings ( Fig. 2 ); rostrum creamy white, its apex, base and lateral sides of second segment luteous ( Fig. 4 ); first segment of antennae with five brown annuli ( Fig. 3 ), second segment brownish yellow at base and dark brown at apex with two submedian elongate and a small creamy white annuli at apex, third segment dark brown, fourth luteous with a dark brown annuli at base and one near apex; pronotum with anterior lobe creamy white having two elongate luteous markings near middle ( Fig. 3 ); petiole creamy white and posterior lobe luteous; scutellum and metanotum brownish yellow, each with a concolorous spine at apex; forelegs creamy white; coxa with one subapical, one subbasal brown annuli; trochanter whitish; femur with one subbasal and three submedian brown annuli; tibia with one wider subbasal and a narrow submedian brown annuli; tarsus white, apex of second segment darker; claw luteous; spiniferous processes on tibiae and femora creamy white, piceous at apex; coxae of middle and hind legs fuscous; trochanters, femora and tibiae creamy white; femora of middle leg with one apical, two submedian brownish yellow and one median dark brown annuli, hind femora with one apical, three submedian brownish yellow and one median dark brown annuli, the length of annuli increasing towards apex, tibia of both middle and hind legs with one subbasal dark brown and one submedian brownish yellow annuli, three brush-like tufts of medium size hairs on middle femora with basal and apical regions brownish yellow and middle region dark brown, hind femora with four tufts, two basal and apical one brownish yellow, remaining one dark brown coloured, middle and hind tibiae with one subbasal dark brown and one submedian brownish yellow tuft of hairs; forewings creamy white, pattern elements luteous to dark brown ( Fig.5 ), hind wings whitish; abdomen dorsally fuscous, ventrally creamy white at base, medially with numerous small fuscous spots and apex fuscous.

Structure: Head. Head short, rounded posteriorly, impressed between the eyes; anteocular region elevated and almost equal to postocular region, postocular region with 1+1 dorsal, conical, apically rounded projections behind constriction ( Fig.2 ); eyes moderate in size, their distance (0.232 mm) dorsally equal to one and one-half times their width (0.319 mm) (1:0.7), rounded in lateral aspect, moderately coarsely faceted; rostrum strongly curved between first and second segments, reaching but not passing anterior coxae, second segment slightly longer than first and swollen, third segment almost equal in length to the second and slender ( Fig.4 ); antenna four-segmented, first segment the longest, followed by the second segment, third segment) the shortest and the fourth segment more than twice the length of the third, relative length of antennal segments: I:II:III:IV= 1:0.92:0.15:0.38, first segment with extremely long, numerous curved delicate hairs dorsally and ventrally, shorter towards apex, a very few long hairs up to middle from base of second segment, second, third and fourth segments possess short indistinct hairs.

Thorax. Thorax long, sharply divided into three parts, forelobe subglobular sharply detached from petiole and with a ventral medial spine ventrally ( Fig.6 ), a central narrow cylindrical petiole about as long as forelobe and 1.3 times smaller than hind lobe (ratio of pronotal lobes I:II:III=0.74:0.75:1) slightly widened posteriorly; hind lobe of pronotum elongate, bell-shaped, somewhat compressed laterally, posteriorly with 1+1 submedian conical elevations with rounded apex, humeral angles not elevated, disc slightly depressed longitudinally at middle ( Fig. 3 ); spines of scutellum and metanotum short, erect, pointed apically with short hairs only. Forelegs moderately slender ( Fig.3 ), forecoxa shorter than hind lobe of pronotum (0.8:1), forefemora with ventrally inclined first and second long spiniferous process, much longer than any of remainder and with more than 20 moderate to smallsized spines, tibia with more than 40 spines; middle and hind legs very long and slender; hind femora reaching apex of forewings. Forewings elongate, membranous with concave apical margin and surpassing apex of abdomen by about 0.8 mm ( Fig.5 ).

Abdomen. Abdomen slender, somewhat widened posteriorly. Surface of abdomen slightly shining. Male genital segments as shown in Fig.7–11 and female genital segments in Fig. 12.

FIGURE 12. Stenolemus annulatus sp. nov. paratype female, apical half of abdomen, ventral view. (VII: 7th Segment; Gc 8: Gonocoxite 8; Gp 9: Gonapophyses 9).

Measurements: [in mm Holotype ♂ (n = 1)]. Body length 7.59; head length, 0.78, width across eye 0.35; length of anteocular region 0.38, postocular region 0.40; length of antennae 4.77, lengths of antennal segments I: 1.95, II: 1.79, III: 0.29, and IV: 0.74; rostral length 0.97, length of rostral segments I: 0.29, II: 0.33 and III: 0.35; length of pronotum 2.12, width across humeri0.98; length of anterior pronotal lobe 0.63,of petiole 0.64, of posterior pronotal lobe 0.85, lengths of pronotal lobes I:II:III= 0.74:0.75:1; length of forecoxa: 0.70, trochanter: 0.12, femur: 1.48, tibia: 1.19, tarsus: 0.16, claws: 0.06; midcoxa: 0.44, trochanter: 0.23, femur: 2.86, tibia: 4.43, tarsus: 0.09, claw: 0.05; hindcoxa: 0.58, trochanter: 0.26, femur: 3.94, tibia: 7.40, tarsus: 0.11, claw: 0.05. Paratype ♀, body length 9.04.

Type material. HOLOTYPE: 1♂, INDIA: West Bengal: North 24 Parganas District: Krishnapur, 24.X.2013, Paramita Mukherjee, ex. at light (Lat.:23.5976°, Long.:88.43°, Alt.: 5 m). PARATYPES: 1 ♀, Maharashtra: Nagpur: M.L.A. Hostel, 16. IX. 2013, M.E. Hassan, ex. in spider web (Lat.:21.1468°, Long.:79.0870°, Alt.: 309 m); 1♀, West Bengal: North 24 Parganas District: Krishnapur, 06.I.2014, Paramita Mukherjee, ex. in spider web (Lat.:22.5915°, Long.:88.43°, Alt.: 5 m).

Habitat. The holotype was collected at light and the paratypes from spider web of Oecobius putus O.P. Cambridge belonging to the family of Oecobiidae .

Distribution. INDIA: West Bengal, Maharashtra.

Etymology. It denotes the annulations on antennae and legs.

Remarks. This new species, Stenolemus annulata is closely related to S. susainathani Wygodzinsky from Nilgiri Hills, South India and S. larat Wygodzinsky from Moluccas, Larat , by sharing common characters such as the ratio of distance between eyes 1.5 times their width, first segment of antennae the longest, postocular region of head with 1+1 short elevations, long thorax, sharply divided into three parts, the anterior portion globose, a central narrow cylindrical petiole and posterior portion with two tubercles, body covered with numerous long, curved pubescence, numerous long hairs on forelegs but not forming tufts. But S. annulatus sp. nov. can be easily separated from the Indian species, S. susainathani Wygodzinsky and also from S. larat Wygodzinsky by the following diagnostic characteristics: petiole about as long as thoracic forelobe and 1.3 times shorter than hind lobe ( Fig. 3 ), first segment of antennae with five annulations ( Fig. 3 ), rostrum creamy white and luteous at apex, basal and lateral areas of second segment ( Fig. 4 ); hind lobe of pronotum with 1+1 submedian conical rounded projections ( Fig. 3 ); forecoxa shorter than hind lobe of pronotum ( Fig. 1 ), foretibia with one subbasal and one submedian annulation and hind femora reaching apex of forewings ( Fig. 1 ).

Figures

FIGURE 1. Stenolemus annulatus sp. nov. holotype male, dorsal habitus.

FIGURES 2 – 7. Stenolemus annulatus sp. nov. holotype male: 2, head and rostrum; lateral view; 3, head, pronotum and forelegs, lateral view; 4, head with rostrum, ventral view; 5, forewings with colour pattern; 6, spine below anterior lobe of pronotum; 7, apical half of abdomen.