Eotrechus fuscus Basu, Chandra & Venkatesan, 2017
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publication ID |
https://dx.doi.org/10.3897/dez.70.97117 |
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publication LSID |
lsid:zoobank.org:pub:99BBA4C8-ED20-4887-9952-B61CC25309D4 |
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persistent identifier |
https://treatment.plazi.org/id/62000292-6845-5587-9D58-1EE06013402E |
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scientific name |
Eotrechus fuscus Basu, Chandra & Venkatesan, 2017 |
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Eotrechus fuscus Basu, Chandra & Venkatesan, 2017 View in CoL
Figs 2 View Figure 2 , 25 View Figure 25
Eotrechus fuscus Basu, Chandra & Venkatesan, 2017: 392-397, figs 1-12 (type locality: Sikkim, India).
Material examined.
Myanmar • 1 ♂, 3 ♀♀ (apterous); Sagaing Div., Alaungdaw Katthapa NP, Pagoda stream; 22°19.113'N, 94°28.518'E; 350 m a.s.l.; 5 May 2003; Boukal et al. leg.; (105); NHMW GoogleMaps • 1 ♂ (macropterous); Sagaing Div., Alaungdaw Katthapa NP, Pagoda stream; 22°19.094'N, 94°28.823'E; 350 m a.s.l.; 6 May 2003; Boukal et al. leg.; (110); NHMW GoogleMaps .
Diagnosis.
Size: apterous male, length 10.30, width 2.64 (apterous); macropterous male, length 11.60, width 2.78; apterous females, length 10.80-11.70, width 2.72-2.82. Antenna: segments I and II, each distinctly longer than segments III, IV; segment III shortest, ca. 0.5-0.6 × length of each of segments I, II, and ca. 0.9 × length of segment IV. Mesosternum ca. 1.6-1.7 × length of metasternum (male: 2.07: 1.19; female: 2.07: 1.30). Fore femur slender in both sexes. In apterous morph, posterior three quarters of mesonotum raised into a hump. Male: abdominal sterna III-VII with longitudinal median groove; sternum VII ca. 0.8 × length of two preceding sterna combined, posterior margin median notch ca. 0.25 × length of sternum VII. Male genitalia: pygophore with two long, relatively slender posterolateral projections (Fig. 2A View Figure 2 ); paramere with proximal half wider, twice as wide as distal half, distal half stout, slightly twisted, tapering to rounded apex (Fig. 2C View Figure 2 ); proctiger posterolaterally produced into rounded processes, posterior margin broadly rounded (Fig. 2B View Figure 2 ). Female: abdomen long and slender; genitalia visible in lateral view, proctiger slightly longer than wide, directed ventrad (Fig. 2D, E View Figure 2 ).
Supplemental description of apterous female.
Head width across eyes 1.99; interocular width 0.80; eye kidney-shaped in dorsal view, length 0.85. Antennae subequal to body length (12.14: 11.40), lengths of segments I-IV: 3.67: 3.38: 2.17: 2.92; segment I without black spines. Pronotum shorter than head length (1.40: 1.89). Posterior three quarters of mesonotum strongly swollen, forming a hump. Lengths of mesosternum and metasternum: 2.07 and 1.30. Lengths of leg segments (femur: tibia: tarsal segment I: tarsal segment II): fore leg: 4.75: 3.50: 0.62: 0.71; middle leg: 9.08: 8.83: 0.60: 0.91; hind leg: 10.0: 11.9: 0.68: 0.93. Fore trochanter with two or three long, fine setae on ventral side. Fore femur similar to males, length ca. 11.9 × maximum width (4.75: 0.40). Fore tibia similar to males. Middle and hind legs similar to males: middle and hind femur with short spines scattered along ventral surface, middle and hind tibiae with scattered long, stout setae. Claws stout, lengths of fore, mid- and hind claws: 0.32: 0.42: 0.41. Total length of abdominal sterna II-VII ca. 0.4 × body length (4.87: 11.4). Sternum VII ca. 0.9 × length of two preceding sterna combined (1.36: 1.53), posterior margin straight. Connexival corners of sternum VII pointed and slightly curved mesad (Fig. 2D View Figure 2 ).
Supplemental description of macropterous male.
Head chiefly black, with a transverse yellow mark on posterior margin; pronotum chiefly black, with yellow stripe on anterior part of midline, not extending onto pronotal lobe; wings chiefly black, membrane brown. Pronotum length (including pronotal lobe) 3.66, humeral width 2.28. Fore wing length 7.25, wing veins similar to E. kalidasa (see Matsuda 1960: fig. 553; Andersen 1982: fig. 8). Other characteristics similar to apterous male.
Macropterous female: Unknown.
Remarks.
The original description by Basu et al. (2017) was based on only a single apterous male. Thus, supplementary descriptions of apterous female and macropterous male are provided as above.
Eotrechus fuscus can be confused with E. kalidasa , and the two species have greatly overlapping distributions. The combination of differences in the relative lengths of antennal segments, the relative lengths of fore tarsal segments, and the shape of the parameres help to distinguish E. fuscus from E. kalidasa , and also from E. steineri sp. nov. (see Table 1 View Table 1 ).
Distribution.
India: Sikkim ( Basu et al. 2017); Myanmar (new record): Sagaing Region (Fig. 25 View Figure 25 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
