Agaporomorphus silvaticus Miller

Miller, Kelly B., 2005, Two new species of Agaporomorphus Zimmermann (Coleoptera: Dytiscidae) from Peru, Zootaxa 1059, pp. 49-59 : 56-57

Agaporomorphus silvaticus Miller , new species

(Figs. 3, 6, 16–18)

Diagnosis. This species lacks conspicuous modifications to the antennae (Fig. 3). The protarsal claws are long and robust with the ventral margins slightly sinuate and the bases strongly curved (Fig. 6). The mesotarsal claws are not long or sinuate. Males lack a triangular process along the posterior margin of abdominal sternite VI and lack a series of oblique rugae on each side of abdominal ventrite III. The male median lobe is very robust and strongly curved in lateral aspect ( Fig. 17 ). It is convoluted with folds and lobes in ventral aspect ( Fig. 18 ).

Description. Measurements. TL = 3.48 mm, GW = 1.70 mm, TL/GW = 2.04. Coloration. Red­brown on all dorsal surfaces, broadly light yellow along anterior margin of elytron. All ventral surfaces and appendages yellow except abdominal sternites, medial portion of prosternum and prosternal process red­yellow. Sculpture and structure. Pronotum with microsculpture consisting of fine, slightly longitudinally lengthened cells, with very fine and short longitudinal striae dispersed randomly and moderately densely; lateral pronotal bead obscured in anterior one­fourth. Prosternum medially strongly and sharply carinate, carina extending onto prosternal process; prosternal process medially with a distinct longitudinal carina extending to apex, laterally with strongly beaded margins, apex pointed. Elytron covered with extremely fine, evenly spaced, short striae, striae more punctiform laterally and apically. Metafemur moderately broad, length about 3.2 times greatest width. Male genitalia. Median lobe in lateral aspect very robust, broadly expanded dorsad, strongly curved, apex narrowed with small hyaline apicoventral lobe ( Figs. 17 ); in ventral aspect very robust, broad, with complicated folding and structures ( Fig. 18 ). Lateral lobe broad basally, narrowed medially, apical portion slender, apicomedially with large membranous lobes bearing series of few long setae ( Fig. 16 ) also with setae apicomedially. Female. Unknown. Sexual dimorphism. Female unknown, but male protarsal claws modified, long, basally strongly curved, slightly sinuate (Fig. 6); pro­ and mesotarsal claws a little less than half length of mesotarsomere V; without apical lobe on mesotarsomere V; protarsomeres I and II broadened, protarsomere I with two large adhesive setae, protarsomere II without adhesive setae; mesotarsomeres I and II slightly broadened, mesotarsomere I with one large, medial adhesive seta and two large, apical adhesive setae, mesotarsomere II with two smaller, apical adhesive setae. Male antennomeres V and VI slightly broader and flatter than other antennomeres (Fig. 3).

Etymology. The specific epithet is a Latin adjective silvaticus , ­ a, ­ um, meaning of or belonging to a wood or to trees, referring to the dense, virgin forest in which this species was found.

Phylogenetic relationships. Agaporomorphus silvaticus is the sister to a clade containing A. tambopatensis and A. knischi based on the common presence in these species of a small series of setae on each side of the dorsal surface of the male median lobe (Char. 7, Figs. 9, 13, 17 ).

Distribution. Known only from Madre de Dios, Peru.

Material examined. HOLOTYPE: ɗ labeled, “ PERU: Madre de Dios, Rio Tambopata, Posadas Amazonas, 13 December 2003, K.B. Miller/ HOLOTYPE: Agaporomorphus silvaticus Miller, 2005 [red label with double black line border].” This species is known only from the holotype.

Figures

FIGURES 8 – 18. Agaporomorphus spp., male genitalia. 8 – 11 — A. knischi; 8 — right lateral lobe, right lateral aspect; 9 — median lobe, right lateral aspect; 10 — median lobe, ventral aspect; 11 — right lateral lobe, left lateral aspect. 12 – 15 — A. tambopatensis; 12 — right lateral lobe, right lateral aspect; 13 — median lobe, right lateral aspect; 14 — median lobe, ventral aspect; 15 — right lateral lobe, left lateral aspect. 16 – 18 — A. silvaticus; 16 — right lateral lobe, right lateral aspect; 17 — median lobe, right lateral aspect; 18 — median lobe, ventral aspect.