Asthenopus hubbardi, Molineri, Carlos, Salles, Frederico F. & Peters, Janice G., 2015

Molineri, Carlos, Salles, Frederico F. & Peters, Janice G., 2015, Phylogeny and biogeography of Asthenopodinae with a revision of Asthenopus, reinstatement of Asthenopodes, and the description of the new genera Hubbardipes and Priasthenopus (Ephemeroptera, Polymitarcyidae), ZooKeys 478, pp. 45-128 : 90-92

Taxon classification Animalia Ephemeroptera Polymitarcyidae

Asthenopus hubbardi sp. n. Figs 16 E–F, 17C, 18D, 18H, 20I

Material.

holotype male imago (slide IBN479CM) from Colombia, Amazonas, Puerto Nariño, Loreto Yacu, S 3°44'26" − W 70°27'19", 5.ii.1999, luz 6−8 h, M.C. Zúñiga, E. Domínguez and C. Molineri cols.; and paratypes: 1 female imago (slide IBN574CM) same data as holotype; and 1 male imago (slide IBN605CM) from Colombia, Amazonas, Puerto Nariño, Lago Tarapoto, S 3°47'47" − W 70°25'17", 4.ii.1999, light trap 18-20 hs, M.C. Zúñiga, E. Domínguez and C. Molineri cols. Holotype deposited in MUSENUV, paratypes in IBN.

Diagnosis.

Asthenopus hubbardi , known from adults of both sexes, can be distinguished from the other species in the genus by the following combination of characters (one autapomorphy is listed in Appendix 2): 1) male FW 7.8-9.2 (Fig. 16 E–F), female FW 13.0; 2) forelegs of male 0.57-0.65 × the length of FW, apex of foretibia with stout spines (Fig. 20I); 3) pronotum width/length ratio: 2.1 (male), 2.7 (female); 4) FW with 4-14 relatively short marginal intercalaries (ca. 20 in female), hind wings without marginal intercalaries (present in all spaces in female); 5) FW with 2-3 cross veins between Rs and MA basal to Rs fork, in both sexes; 6) forceps relatively slender, ratio length/basal width 4.7-6.0 (Fig. 17C); 7) penes tubular and robust, furrow separating penis lobe from thumb well marked, median remnant of styliger plate subrectangular, pedestals subrectangular to subovate, relatively large (Fig. 17C); 8) female sternum VIII with reduced female sockets, anteromedian keel present (Fig. 18H); 9) eggs ratio maximum width of egg/maximum width of PC 1.1-1.3, cap formed by 3-8 filaments, chorionic plates almost contiguous (Fig. 18D).

Male imago. Length (mm): body, 7.0-7.1; FW, 7.8-9.2; HW, 3.3-4.0; leg I, 5.1-5.2; cerci, 22.0-23.0. General color whitish brown. Head whitish shaded black dorsally except thin line along hind margin, with a pair of blackish short lines anteriorly to median ocellus. Antennae whitish shaded gray at margins of scape. Thorax. Pronotum ratio width/length: 2.1. Pronotum yellowish translucent widely shaded black, except on pale transversal line between anterior and posterior rings, and on mediolongitudinal line of posterior ring, and posterolateral oblique dashes. Meso- and metanotum whitish yellow shaded black on carinae and margins, also shaded on black on posteromedian triangular zone. Legs whitish shaded gray on dorsum of foreleg, all coxae, and on legs II–III on apex of tibiae and dorsum of tarsi; foretarsal segment 1 is shown in Fig. 20I. Wings (Fig. 16 E–F) membrane hyaline except apically whitish on C and Sc areas, veins translucent yellow turning hyaline distally, except basal 2/3 of veins Sc and R1 yellowish; 2 cross veins between R and M basally to R stem. Abdomen whitish shaded almost completely with brownish gray except at pale intersegmental membranes, oblique dashes on lateral zones of terga I–VIII, submedian pale spots on anterior margin of terga II–IX, and single posteromedian pale spot on terga III–IX. Genitalia (Fig. 17C) whitish except penes yellowish. Caudal filaments whitish, slightly shaded gray on basal segments of cerci.

Female imago. Length (mm): body, 10.5; FW 13.0; HW, 5.0, cerci 3.8. Similar to male, shaded dorsally more uniformly and markedly. Pronotum ratio width/length: 2.7. FW with 4 cross veins between R and M basal to R stem (none of them just below fork). Abdominal sternum VIII with keel as in Fig. 18H. Cerci yellowish turning whitish apically; ratio length cercus /FW = 0.3.

Eggs (Fig. 18D). Length, 210-245 µ; width, 135-150 µ. Polar caps (maximum width, 110-135 µ) formed by 3-8 long coiled threads. The chorionic plates are almost contiguous, leaving a reduced smooth chorionic surface among them (Fig. 18D).

Etymology.

The species is named for Mike Hubbard who has contributed significantly to the understanding of mayflies throughout the world.

Distribution.

Two near localities in the Amazonas River from Colombia.

Discussion.

This species is very similar to Asthenopus angelae , and both were collected in the same lightraps in Colombia, nevertheless they can be separated because Asthenopus hubbardi shows translucent veins in the wings (brownish in Asthenopus angelae ); in most specimens a cross vein is present just below R fork in Asthenopus angelae (more basal or distal in Asthenopus hubbardi ), and the penes are shorter and well separated from the basal thumb in Asthenopus hubbardi (similar to Asthenopus curtus ). Asthenopus hubbardi is further characterized because foretibia (Fig. 20I) presents strong marginal spines (weak or absent in Asthenopus curtus ).