Agaporomorphus tambopatensis Miller

Miller, Kelly B., 2005, Two new species of Agaporomorphus Zimmermann (Coleoptera: Dytiscidae) from Peru, Zootaxa 1059, pp. 49-59 : 52-54

Agaporomorphus tambopatensis Miller , new species

(Figs. 2, 5, 7, 12–15)

Diagnosis. This species can be distinguished from all other known Agaporomorphus except A. knischi by the presence of a modification of antennomere VI in the male. This antennomere is broader than in other taxa and has a distinct emargination on the posteroventral surface (Fig. 2). The antennae in male A. knischi are modified as well, but antennomere V in that species is broadly triangular and antennomere VI is broader and more broadly emarginate. In A. tambopatensis the male protarsal claws are relatively unmodified, evenly curved and slender (Fig. 5). The male mesotarsal claws are not especially long and are not sinuate. In males there is a small, triangular process extending from the middle of the posterior margin of visible abdominal sternite V and a series of oblique, parallel strigae on each side of abdominal ventrite III. The male median lobe is very broad and has a small series of setae on each side of the dorsal surface ( Fig. 13 ). In ventral aspect the median lobe is convoluted with lobes and folds ( Fig. 14 ).

– Agaporomorphus spp., morphological details. 1, 4— A. knischi ; 2, 5, 7— A. tambopatensis ; 3, 6— A. silvaticus . 1–3—left antenna, male, ventral aspect; 4–6—right protarsus, male, posterior aspect; 7—genitalia, female, ventral aspect. co—common oviduct; fd—fertilization duct; gc—gonocoxa; gs—gonocoxosternite; lt—laterotergite; ra—rami; sd—spermathecal duct; sp—spermatheca; va—vagina.

Description. Measurements. TL = 2.91–3.08 mm, GW = 1.48–1.58 mm, TL/GW = 1.95–1.97. Coloration. Red­brown on all dorsal surfaces, broadly light yellow along anterior margin of elytron. All ventral surfaces and appendages yellow except abdominal sternites red­yellow. Sculpture and structure. Pronotum with microsculpture consisting of fine, slightly longitudinally lengthened cells, with very fine and short longitudinal striae dispersed irregularly 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 robust, with broad expansion dorsad, apex with hyaline apicoventral lobe ( Fig. 13 ); in ventral aspect very robust, broad, with complicated folding and structures ( Fig. 14 ). Lateral lobe broad basally, strongly narrowed medially, apical half very slender, apicomedially with large membranous lobes bearing series of long setae ( Figs. 12, 15 ). Female genitalia (Fig. 7). Spermatheca very long, coiled, slender, tapered to spermathecal duct; spermathecal duct relatively short; fertilization duct very long, coiled; gonocoxa slender, lateral margin broadly convex, apex expanded; laterotergite very slender, elongate. Sexual dimorphism. Male protarsal claws unmodified (Fig. 5); pro­ and mesotarsal claws about 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 1 with one large, medial adhesive seta and two large, apical adhesive setae, mesotarsomere II with two smaller, apical adhesive setae; female pro­ and mesotarsomeres unmodified. Male with distinct triangular, posteriorly­directed prominence medially along posterior margin of visible abdominal sternite V; female without spine. Male antennomeres V and VI modified, V broadly triangular, VI broad with large posterior emargination (Fig. 2); female antennomeres unmodified. Va ri at io n. Coloration variable from relatively light brown with pale pronotum and elytral bases to darker brown and more concolorous.

Etymology. The specific epithet is a Latinized adjective tambopatensis derived from the name of the type locality of this species.

Phylogenetic relationships. Agaporomorphus tambopatensis is the sister to A. knischi ( Fig. 19 ) based on the common presence in males of a triangular spinous process medially along the posterior margin of visible abdominal sternite V (Char. 8, Miller 2001a: fig. 32), a series of parallel oblique strigae on each side of the medial surface of abdominal ventrite III (Char. 9, Miller 2001a: fig. 32) and modifications of antennomere VI (Char. 10, Figs. 1–2).

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 tambopatensis Miller, 2005 [red label with double black line border].” PARATYPES, 20 total, labeled same as holotype except “…/ PARATYPE: Agaporomorphus tambopatensis Miller, 2005 [blue label with black line border].”

Figures

FIGURE 19. Single most parsimonious cladogram of Agaporomorphus species (length = 12, CI = 91, RI = 92). Numbers above hatch marks refer to characters numbers. Numbers below hatch marks refer to character state transformations.

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.