Aenigmatrichia asymmetrica, Wells & De Moor, 2020

Wells, Alice & De Moor, Ferdinand C., 2020, Hydroptilidae (Trichoptera) of Angola, a new genus, seven new species, and five new records, Zootaxa 4868 (4), pp. 495-514 : 505-506

Aenigmatrichia asymmetrica sp. nov.

( Figs 26 –36)

Material examined. Holotype male, [CAW 891BC], ANGOLA, Moxico Province, Collecting event 3— Lungue Bungo River , along marshy river banks with swift flowing river containing trailing and marginal aquatic vegetation, light trap downstream of road-bridge, -12.58391 18.66511, 21/iv/2018, H.M. Barber-James & F.C. de Moor.

Paratypes, ANGOLA: 2 males, 1 female, same data as for holotype ; 2 males, [CAW 895 V, slide], Moxico Province, Collecting event 5— Lungue Bungo River , along marshy river banks with swift flowing river containing trailing and marginal aquatic vegetation, light trap downstream of road-bridge near second camp site, -12.58440, 18.66790, 22/iv/2018, H.M. Barber-James & F.C. de Moor .

Diagnosis. As for genus.

Description. Male. Length of each forewing 1.4–1.8 mm (n = 4). Antennae with 19 flagellomeres, flagellomeres bearing scattered sensilla auricillica and clothed in basal whorl of long setae ( Fig. 27 ). Genitalia: Abdominal segment VIII with pair of unequal length sclerotised spines dorsolaterally and ventrally with mesal patch of stout strong setae, produced distally to form extended lateral lobes; tergite X short, tapered to shallowly concave apex, lateral pair of stout membranous lobes tipped by single seta interpreted as representing ventral plate; inferior appendages elongate, rod-shaped, lightly sclerotised; phallus tapered, apically flared, slender titillator arising at about one-third length.

Female. Length of each forewing 2.0 mm (n = 1). Antennae damaged, remaining flagellomeres rectangular in profile. Terminalia: Abdominal segment VIII modified, short dorsally, ventrally forming prominent cone-shaped structure; segment IX fused with tergite X.

Etymology. The specific name asymmetrica refers to the unequal size and shape of the dorsolateral spines on abdominal segment VIII.

Distribution. Collected at two sites on the Lungue Bungo River in the Moxico Province.

Remarks. Six females taken with the sample CAW891BC, probably represent 3 different species.

Figures

FIGURES 26–29. Aenigmatrichia asymmetrica gen. et sp. nov. male [CAW 895V]: 26, head, dorsal, showing ocelli, posterolateral and posterior setal warts; 27, antennal flagellomeres, showing rings of clothing hairs, and curved sensilla towards apices; 28, thorax, dorsal; 29, abdomen, ventral. Abbreviations: II–VIII = abdominal segments II to VIII.