Manggabora, Dean & Suter, 2004

Dean, J. C. & Suter, P. J., 2004, Descriptions of new species and a new genus of leptophlebiid mayflies (Insecta: Ephemeroptera) from the Northern Territory, Australia, Memoirs of Museum Victoria 61 (1), pp. 111-118 : 113

Manggabora gen. nov.

Type species. Manggabora wapitja sp. nov.

Diagnosis. Imago. Forewing length-width ratio 2.8–3.0 (Fig. 14); membrane hyaline, except costal and subcostal cells in apical third of wing which are opaque, white; costal crossveins basal to bulla very faint, difficult to see, crossveins elsewhere weakly developed; ICu 1 usually linked to CuA-CuP crossvein, terminating free in some individuals; ICu 1 and ICu 2 parallel as wing margin approached. Hindwing approximately 0.22 length of forewing; costal margin with shallow concavity a little beyond midlength; vein Sc joining costal margin at about 0.85 wing length (Fig. 15). Legs with tarsal claws dissimilar, one with an apical hook and opposing ventral flange, the other large, pad-like (Fig. 16). Male genitalia (Figs 19–22) with claspers three-segmented, penes extending beyond narrowing of claspers; penes lobes narrow, fused almost to apex, ventral surface with a robust, medial projection; each lobe with a stout, retractable apical spine. Female ninth sternum strongly projecting, posterior margin entire (Fig. 23). Subimago. Wings uniformly pale grey-yellow, without pattern. Mature nymph. Labrum a little broader than clypeus; maximum width about 2.3 times length along median line (Fig. 25); anterior margin overhanging medial notch; frontal setae sparse, arranged as narrow band. Mandibles (Figs 26, 27) with outer incisors slen- der; outer margin swollen at base of incisor. Maxillae with subapical row of 12–15 pectinate setae on ventral surface (Fig. 28). Labium with glossae slightly dorsal to paraglossae, not turned under ventrally (Fig. 29); labial palp with terminal segment about half length of middle segment, without spine-like setae along inner margin. Femora with long spine-like setae and hair-like setae along outer margin (Fig. 30); tarsi with all ventral spines similar in length; tarsal claws with ventral teeth (Fig. 31). Abdominal segments with posterolateral spines on segments 4 or 5–9; posterior margins of abdominal terga with an almost continuous series of very small triangular spines, about 10 µm long, interspersed with fewer long hair-like seta (Fig. 33); gills linear, lateral tracheae very weakly developed or absent (Fig. 32). Caudal filaments (Fig. 34) with apical whorl of flattened, triangular spines on each segment, and between each spine a series of 4 or 5 fine setae about half segment length.

Etymology. The genus is named after Manggabor Creek, Arnhem Land, one of the collection localities for the species. Feminine.

Remarks. Manggabora is a member of the Austrophlebioides lineage, as evidenced by the following features: (1) adult tarsal claws dissimilar; (2) forewing with ICu 1 usually linked to CuA-CuP crossvein; (3) sternum 9 of female with apical margin entire; (4) mouthparts of nymph with labrum broader than clypeus; (5) mandibles with outer incisors slender; (6) terminal segment of labial palp, short, about half length of middle segment. The lineage is restricted to the Southern Hemisphere, and includes the Australian genera Austrophlebioides , Tillyardophlebia and Kirrara . Manggabora can be distinguished from all other genera in the lineage by the following combination of characters: (1) penes lobes relatively slender, fused almost to apex, with large ventral projection near apex; (2) anterior margin of labrum overhanging central notch; (3) maxillae with only 12–15 pectinate setae in subapical row; (4) absence of elongate ventral spines from all tarsi; (5) posterolateral spines on abdominal segments 4 or 5–9 only.