Denticulobasis, Machado, Angelo B. M., 2009

Machado, Angelo B. M., 2009, Denticulobasis and Tuberculobasis, new genera close to Leptobasis, with description of ten new species (Odonata: Coenagrionidae)., Zootaxa 2108, pp. 1-36 : 9

Denticulobasis gen. nov.

Type species: Denticulobasis garrisoni sp. nov., by present designation.

Etymology: From the Latin denticulus – meaning diminutive of tooth and – basis, a Greek feminine noun for pedestal or foundation; a common suffix used in Coenagrionidae . The name Denticulobasis is an allusion to the presence of a plate with denticles on female sternum S8.

Distribution: Brazil and Peru ( Fig. 101).

Generic characterization. Medium size damselflies (HW 18.2–19.2 mm). Top of head brown with blue postocular spots. Thorax dominantly yellow, with three longitudinal pale blue stripes: antehumeral, metepisternal, and metepimeral. S1–7 dorsally brown, laterally yellow, S8–10 dorso-laterally yellow. Frons rounded. Hind prothoracic lobe in males with very small lateral lobes, median lobe well-developed, projected caudally and two-lipped ( Figs 4–6 ); females with well-developed lateral and median lobes ( Figs 8–10 ), the latter single-lipped.

Male mesepisternum with an antero-medial horn with a basal smooth portion and a distal portion ridged as a screw. Female mesepisternum with an antero-medial mammiliform tubercle. Metafemoral spines on distal 1/2 as long as width of femur ( Fig. 3 a); metatibial spurs shorter than intervening spaces ( Fig. 3 b). Supplementary tooth of tarsal claw well-developed ( Figs 3 c, d). Wings petiolated distal to Ac for a distance as long as or twice as long as Ac length ( Fig. 3 e). R 3 in FW and HW originating closer to Px 6 ( Fig. 3 e). Penis ( Figs. 1 ) distal segment expanded laterally along distal 1/3 forming a large lateral terminal lobe and with two lateral lobes on each side. No terminal fold. Internal fold with a filiform process directed disto-laterally ( Fig. 1 ). Male cercus with a dorso-lateral membranous depression at base ( Figs. 12–13 ) and no ventral process. Cercus in lateral view subequal to S10 (excluding distal lobe). Female sternum S8 with a denticulated vulvar plate (Figs. 18, 20, 22). Ovipositor extending to about level of tip of cercus ( Fig. 11 ). Ventral border of lateral valve of ovipositor with one row of denticles each one subrectangular, directed ventro-posteriorly and associated with a robust short truncated seta ( Fig. 2 a).

Figures

FIGURE 1. Denticulobasis garrisoni, paratype: penis with distal segment raised [by R. W. Garrison].

FIGURE 2. Ovipositors: denticulated part of ventral border of lateral valve. SEM: (a) Denticulobasis dunklei in lateral view; (b) T. williamsoni ventro-lateral view showing borders of two valves; (c) L. vacillans in lateral view.

FIGURE 3. Denticulobasis garrisoni, male, holotype: (a) metafemur; (b) metatibia; (c) tarsus; (d) tarsal claw; (e) wings [3 e from a wing scan by R. W. Garrison].

FIGURES 4 – 11. Denticulobasis, male thorax in dorsal and lateral view: D. dunklei, holotype (4, 5); D. garrisoni, holotype (6, 7); female thorax in dorsal view: D. ariken, holotype (8); D. dunklei, allotype (9); and D. garrisoni, allotype (10); female S 8 – 10 in lateral view, D. garrisoni, allotype (11).

FIGURES 12 – 17. Denticulobasis, male anal appendages in dorsal, lateral, and ventro-posterior view in holotypes of D.