Eotrechus elongatus Vitheepradit & Sites, 2007

Tran, Anh Duc, Zettel, Herbert & Sites, Robert W., 2023, Revision of the genus Eotrechus Kirkaldy (Hemiptera, Heteroptera, Gerridae), with descriptions of six new species, Deutsche Entomologische Zeitschrift 70 (1), pp. 69-111 : 69

Eotrechus elongatus Vitheepradit & Sites, 2007

Figs 15A-E , 25

Eotrechus elongatus Vitheepradit & Sites, 2007: 8-12, figs 2, 6-8 (type locality: Phu Hin Rongkla National Park, Phitsanulok Province, Thailand).

Eotrechus elongatus : Nakthong et al. (2014: 59, figs 36, 40) (key, diagnosis, notes).

Material examined.

Holotype: Thailand • ♂ (macropterous); Phitsanulok Province, Phu Hin Rongkla National Park, Nam Tok Romglao , rock face; 16°59'N, 101°00'E; 1190 m a.s.l.; 6 May 2003; Vitheepradit, Prommi, Ferro leg.; L-507; UMC.

Paratypes: Thailand • 10 ♂♂, 7 ♀♀ (macropterous); same locality data as holotype; UMC ; • 1 ♂, 1 ♀ (macropterous); same locality data as holotype; ZRC • 1 ♂ (apterous); same locality as preceding; 23 Aug. 2002; CMU team leg.; UMC .

Other material.

Thailand • 1 ♂ (apterous) , 1 ♂, 1 ♀ (macropterous); Phitsanulok Province, Phu Hin Rongkla National Park, Romglao Waterfall ; 16°59'N, 101°00'E; 1190 m a.s.l.; 22 Apr. 2002; CMU Team leg.; UMC .

Diagnosis.

Size: macropterous males, length 8.56-9.28, width 2.36-2.48; macropterous females, length 9.12-9.52, width 2.64-2.72. Ventral side of head mainly dark-brown (in both sexes). Mesosternum ca. 2.7 × (male) and 2.8 × (female) length of metasternum. Male: fore femur incrassate, slightly constricted before apex, basal part with broad tubercle bearing patch of minute, dark setae, flexor side of femur with a row of ca. 10 long, stiff setae; fore tibia almost straight, slightly more slender at distal half, long, stiff setae scattered on exterior side and denser at distal part (Fig. 15A, B ); abdominal sternum VII broadly depressed, slightly longer than two preceding sterna combined, posterior margin broadly emarginated into a notch about one-third of sternum VII length. Male genitalia (Fig. 15C-E ): venter of abdominal segment VIII longer than sternum VII, posterior margin angular medially; pygophore with lateral tubercle indistinct, caudal projection plate-like, narrow, and tapering towards apex, directed dorsad; paramere small, ovoid; proctiger with small lateral lobes not reaching tip of median lobe in dorsal view, posteroventral surface with patch of long, brush-like setae. Female: fore leg more slender than that of male; fore femur without basal tubercle, with 16-18 long stiff setae along flexor side; fore tibia similar to male; abdomen, in lateral view, tapering towards apex; sternum VII about as long as two preceding sterna combined, not enclosing the genitalia.

Remarks.

In the female, relative lengths of mesosternum to metasternum is 2.76: 1.00, not 1.83: 1.00 as measured by Vitheepradit and Sites (2007). For comparative notes, see Remarks for E. fansipan .

Distribution.

Thailand: Phitsanulok ( Vitheepradit and Sites 2007) (Fig. 25 ).

Figures

Figure 15. Eotrechus elongatus (A-E) and E. siamensis (F-I), males. A, B, F. Right fore leg (A, F. Ventral view; B. Dorsal view); C, G. Genital capsule, lateral view; D, H. Pygophore, dorsal view; E, I. Proctiger, dorsal view (A, B, F. Same scale; C-E, G-I. Same scale).

Figure 25. Distribution records of species of Eotrechus. Squares represent E. kalidasa species group; circles represent E. pingae species group; triangles represent species unassigned to a group.