Trichogenia hubleyi Webb & McCafferty, 2006

Webb, J. M., Braasch, D. & Mccaferty, W. P., 2006, Reevaluation of the Genera Compsoneuria Eaton and Trichogenia Braasch & Soldán (Ephemeroptera: Heptageniidae), Zootaxa 1335, pp. 55-68 : 61-62

Trichogenia hubleyi Webb & McCafferty N.SP.

Larval description: Head capsule subrectangular ( Fig. 1), with numerous fine and sparse branched, robust setae dorsally. Labrum ( Fig. 2 ) much wider than long, dorsally with numerous long, fine setae, ventrally with median row of short, robust setae and many long, fine setae laterally. Mandibles ( Figs 3 and 4 ) with dense patch of setae on lateral margin at base of outer canines, lateral margin with row of long setae on apical half and patch of setae dorsally on basal portion. Hypopharynx ( Fig. 5 ) with lateral margins of superlingua subparallel; lingua with median U-shaped notch bordered by pair of apicolateral processes. Maxillae ( Fig 6 ) ventrally with row of fimbriate setae, dorsally with lateral row of long, fine setae; apical margin of galealaciniae with nine comb setae; first segment of palp with numerous long, fine setae; second segment with long, fine setae laterally, bare medially; third segment small, sharp. Glossae broadly rounded apically, numerous robust setae ventrally; dorsal surface of last segment of palps with row of fine setae stopping at medial margin ( Fig 7 ). Thorax dorsally with numerous fine setae, sparse ginko-shaped robust setae; pronotum with pair of small, spicule-covered protuberances; meso- and metathoracic supracoxal sclerites long, sharp, projecting dorsally ( Fig. 8 ). Forefemora dorsally with row of long, fine setae and numerous long, robust setae; anterior surface with spatulate setae and long, fine setae; ventral margin with numerous short, robust setae and short, fine setae. Foretibiae with sparse row of fine setae on posterior margin; lateral ridge with row of spatulate setae; anterior margin with numerous short, robust setae; entire surface of tibiae covered with fine setae. Foretarsi covered with fine setae, laterally with several spatulate setae. Mid- and hindlegs similar to forelegs but with more numerous robust setae; femora with anterior face with robust setae all of approximately same size and shape ( Fig. 9 ). Abdomen dorsally with numerous fine setae and branched robust setae ( Fig. 10 ); posterior margins of terga with sharp spines. Gills 1–7 with numerous long fibrils, lamellae with long, fine setae; lamellae of gills 1 small; lamellae of gills 2–4 long and narrow; lamellae of gills 5–7 rounded, with short apical point. Caudal filaments with short spines at intersegmental margins; median caudal filament with long, fine setae on both sides of joints; cerci with long, fine setae medially.

Adult: Unknown.

Etymology: The specific epithet is in honor of Brad Hubley of the Royal Ontario Museum, Canada, who has provided us with numerous southeast Asian specimens.

Diagnosis: Trichogenia hubleyi can be differentiated from congeners by the following combination of characteristics: i) well-developed comb setae on the anterior margin of the galealaciniae; ii) long supracoxal spines on the meso- and metathorax; iii) anterior surface of femora with setae all of same size; iv) abdominal terga with numerous branched, robust setae scattered over entire surface.

Material examined: HOLOTYPE: 1 larva, Indonesia, Celebes, Sulawesi Utara Province, swift clear stream nr S end of L Mara, 10-IX-1985, JT & DA Polhemus [ PERC] PARATYPES: 17 larvae (parts of one slide-mounted), same data as holotype [ PERC].

Figures

FIGURE 2 – 5. Trichogenia hubleyi. 2, labrum: a. dorsal b. ventral; 3, left mandible; 4, right mandible; 5, hypopharynx: a. dorsal b. ventral.

FIGURE 6 – 10. Trichogenia hubleyi. 6, maxilla: ventral; 7, labial palp: dorsal view of terminal segment; 8, supracoxal sclerites (indicated by arrows); 9, hindfemur: setae on middle section of anterior face; 10, tergum V: setae.