Heptagoniodes guimaraesi Valim new species

(Figs 1–2, 4–5, 7, 12–13)

Type host: Tinamus solitarius pernambucensis Berla, 1946.

Type locality: Mata do Othon, Barra de São Miguel, Alagoas, Brazil

Diagnosis: The new species is morphologically close to Heptagoniodes agonus (Nitzsch [in Giebel], 1874) (ex Tinamus tao tao Temminck, 1815) and H. dimorphus Carriker, 1944 (ex T. tao kleei (Tschudi, 1843)) having the anterior margin of the temples sharply pointed (Fig. 4). However, it can be readily distinguished from these two species by the different shape of the mesosomal plate in the male genitalia, which is similar in both H. dimorphus and H. agonus (compare Fig. 12 against Fig. 10 and fig. 26b in Carriker 1944: 209).

Description: Dorsal habitus of male (Fig. 1) and of female (Fig. 2) fit the general morphology and chaetotaxy of the other four species placed in Heptagoniodes. Male head as in Fig. 4, with temples sharply pointed on their latero-anterior angles; head of female as in Fig. 5.

Thorax shape as in Figs 1–2, with chaetotaxy mostly as for the family. Pronotum with a pair of post-spiracular setae, each set on a postero-lateral projection (pssp in Figs 4–5), and three submarginal setae (sensu Mey 1994) each side, with the posterior seta longest and reaching the middle of prothorax (see pms in Figs 4–5). Pteronotum (from lateral to medial) with one latero-ventral spine-like seta, one latero-ventral trichoid seta, two postero-lateral, two postero-medial, plus one minute antero-medial seta. All thoracic sternites without setae.

Abdominal pattern of setae homogeneous, with few setae on both dorsal and ventral surfaces, similar to other species in the genus. Dorsal chaetotaxy on each side: only two small atrophied setal alveoli (asa) one lateral and one medial on the anterior margin of tergite II (in males the medial seta is well developed); in the posterior margin one long and distinct seta in males, but in females this seta is an inconspicuous asa; a long post-spiracular setae present on tergites III–VII. Male tergite III large, with a small concavity on its posterior margin laterad to postspiracular seta; tergite IV roughly rectangular; tergites V–VII with a postero-medial notch. In females tergites II–III as in males, IV–VII roughly rectangular. Tergite VIII with trichoid seta present on its postero-lateral angles, and the medial angle with an asa of the medial seta. Porotaxy: sensilla (Clay 1954) present on tergites IV–V (see Figs 1–2). Sternites IV–V with a small lateral plate, reticulated and oblong in shape, set on lateral sides of segments. Sternal chaetotaxy on each side: IV–V, one small lateral setae mediad to the small lateral sternites (rarely two in one side); VI, two small lateral setae mediad to the lateral sternites plus a very short setae (these setae are rarely present on V); VII, with two long and eight medium-long setae in females but absent in males. Pleural setae each side: III–V, 2 (1 long and 1 short setae); VI–VII, 3 (all long); VIII, 4 (all long).

Male genitalia distinctive, with a bell-shaped mesosome with lateral latero-posterior projections, one pair of sensilla on its mid-line and another pair on the base of each paramere; parameres long, slightly curved inwardly, with faint and finely pointed tips, and with one sub-apical sensillum and one apical small seta (Fig. 12).

Female vulvar margin with medial concavity, with 13–16 small anterior setae and 8–11 medium-long posterior setae each side.

Measurements. Male (N=18): HL 0.51–0.65 (0.62±0.030); FW 0.40–0.45 (0.43±0.011); POW 0.57–0.64 (0.60±0.019); EW 0.44–0.50 (0.47±0.013); TW 0.71–0.80 (0.75±0.025); AnL 0.50–0.60 (0.53±0.027); PL 0.22–0.27 (0.24±0.014); PW 0.46–0.50 (0.48±0.011); PTL 0.33–0.38 (0.36±0.013); PTW 0.68–0.76 (0.72±0.021); AL 1.46–1.61 (1.56±0.039); AW 0.88–1.08 (1.01±0.042); PrL 0.24–0.29 (0.26±0.012); MeL 0.24–0.31 (0.28±0.017); TL 2.40–2.67 (2.56±0.067).

Female (N=18): HL 0.62–0.69 (0.66±0.018); FW 0.32–0.42 (0.35±0.021); POW 0.41–0.52 (0.45±0.029); TW 0.67–0.79 (0.75±0.033); AnL 0.27–0.31 (0.29±0.012); PL 0.22–0.29 (0.25±0.014); PW 0.43–0.49 (0.47±0.017); PTL 0.34–0.39 (0.37±0.018); PTW 0.63–0.75 (0.71±0.030); AL 1.50–1.70 (1.60±0.056); AW 0.87–1.03 (0.97±0.040); TL 2.49–2.77 (2.65±0.082).

Type material: ex Tinamus solitarius pernambucensis. ♂ holotype (MZUSP #3208), Mata do Othon (09°50'S; 35°54'W), Barra de São Miguel, Alagoas, Brazil, 21 Feb. 1979, D.M. Teixeira coll. Paratypes: 20♂ and 19♀ (MZUSP #3209–3229), same data as the holotype.

Additional non-type material: ex T. solitarius pernambucensis. 6♂, 14♀, 5N (MZUSP #5769–5780), Roteiro (09°50'S; 35°58'W), Alagoas, Brazil, Nov. 1978, P.M. Nardelli coll. (W.C.A. Bokermann leg.). 2N, same data as the holotype.

Etymology: The specific epithet is a noun in a genitive case honouring Lindolpho R. Guimarães (1908–1998), whose long-term studies on tinamous lice in Brazil earned him recognition as a world authority of this group of bird lice.