Eotrechus petraeus Andersen, 1982

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 petraeus Andersen, 1982

Figs 6 , 7 , 26

Eotrechus petraeus Andersen, 1982: 15-16, figs 10, 18, 20, 24 (type locality: Doi Suthep, Chiang Mai, Thailand).

Eotrechus petraeus : Andersen (1998: 6) (checklist).

Material examined.

Holotype: Thailand • ♂ (apterous); Chiang Mai Province, Doi Suthep National Park, Mahidol waterfall; 1250 m a.s.l.; 27 Sep. 1981; Zool. Museum Copenhagen leg.; ZMUC.

Diagnosis.

Size: apterous male: length 7.8, width 2.0 (Andersen, 1982). Male: mesosternum ca. 3.6 × length of metasternum; fore femur incrassate, with a large basal tubercle bearing a round spot of black, minute setae, along flexor side of femur with a row of eight long, stiff setae (three on base, five on elongate part); fore tibia distally thicker and curved, flexor side clearly bisinuate, with scattered stiff setae on exterior side (Fig. 6 ); abdominal sterna II-VI weakly grooved in the middle; sternum VII broadly depressed, slightly shorter than two preceding sterna combined, posterior margin with a large U-shaped median notch about as deep as two-fifths of sternum VII length. Male genitalia: abdominal segment VIII large, ventral side distinctly longer than sternum VII, posterior margin with dense, brownish setae; pygophore with small lateral tubercles bearing a tuft of yellowish setae, which is directed dorsad, caudal projection of pygophore long, triangular, and with apical part evenly curved dorsad (Fig. 7A-D ); paramere elongated, tapering towards apex, length more than twice as width (Fig. 7D ); proctiger with lateral processes rectangular, bearing long, brownish setae, ventral surface with a patch of dark, long, brush-like setae (Fig. 7E, F ). Female unknown.

Remarks.

See comparative notes for E. kerberos sp. nov.

Some specimens collected at Doi Inthanon (Chiang Mai, Thailand) were recorded as Eotrechus petraeus by Vitheepradit and Sites (2007); in fact, they belong to a new species, E. thai sp. nov., as described in a later section of the present paper.

Distribution.

Thailand: Chiang Mai ( Andersen 1982) (Fig. 26 ).

Figures

Figure 6. Eotrechus petraeus, habitus of holotype. A. Lateral view; B. Dorsal view (both of same scale).

Figure 7. Eotrechus petraeus, holotype. A, B. Genitalia, ventral and lateral views; C, D. Pygophore, lateral and dorsal views; E, F. Proctiger, lateral and dorsal views. (A, B. Same scale; C-F. Same scale).

Figure 26. Distribution records of species of Eotrechus. Circles represent E. longipes species group; squares represent E. petraeus species group; stars represent E. vietnamensis species group.