Arcyphysa volsella, Wells & Contents, 2018

Wells, Alice & Contents, Arturs Neboiss Table Of, 2018, Australian Diplectroninae reviewed (Insecta: Trichoptera), with description of 21 new species, most referred to a new genus, Zootaxa 4415 (1), pp. 1-44 : 42-43

Arcyphysa volsella sp. nov.

( Figs 141, 142 )

Material examined. Holotype ♂, Queensland, Lamington National Park, Coomera Creek , 8.ii.1961, F.A. Perkins ( NMV [PT-1013; TRI-13820]).

Paratypes, Queensland: 2♂, data as for holotype NMV [TRI-13820] ; ♂, Lamington National Park, 25.1.1963, A. Masters (AM, poorly preserved [PT-1004]).

Diagnosis. In the form of the apicolateral processes, the clear separation of abdominal segments IX and X, and general features of wings and head, Arc. volsella resembles Arc. flinti, Arc. tortula , and Arc. anaplasis , but unlike the arrangement in those species, in Arc. volsella the harpago is not divided into two separate lobes; in this respect, Arc. volsella most closely resembles Arc. nebo . Both Arc. volsella and Arc. nebo share the feature of tapered apices on the apicolateral processes of segment IX, rather than rounded apices as in Arc. angusta , and Arc. volsella has stout coxopodites that in lateral view are distally about 1.5x as thick as their basal width, not of even width along their lengths as in the other two species.

Description. Male. Genitalia ( Figs 141, 142 ): Abdominal segment IX in lateral view clearly demarcated from tergite X, midlaterally with long slender twisted apicolateral processes extending well beyond apex of tergite X, densely setose on mesal margins of distal 1/3; tergite X shallowly cleft apically; gonopods in lateral view each with coxopodite expanded towards truncate apex such that apical margin almost 1.5x width at proximal margin, harpago undivided, tapered distally, with small spur on apicomesal margin; phallic apparatus without parameres, stoutest in middle region, narrowed towards apex, in lateral view strongly curved downwards.

Distribution. Collected only from south-eastern Queensland, from Lamington National Park.

Remarks. Neboiss’ male genitalic preparations of specimens of this species have been found, but despite several careful searches of the NMV collection, and enquiries to QM and AM, the relevant bodies have not been located. Since in general features the species referred to Arcyphysa are relatively constant, and the genitalia of A. volsella are distinctive, this newly described species is included, based solely on the genitalic preparations.

Figures

FIGURES 132–145. Arcyphysa gen. nov. spp., ♂ genitalia diagnostic features. 132–133, Arc. acmea sp. nov. (Qld, Mt Bartle Frere, 0.5km N of South Peak [PT-999]): 132, ventral;133, left lateral.134–135, Arc.anaplasis sp. nov. (Qld, 25 km along Mt Lewis Road, SW of Mossman [PT-1003]): 134, ventral; 135, left lateral. 136–137, Arc. tortula sp. nov. (Qld, Bellenden Ker Range, Cable Tower No. 3 [PT-1031]): 136, ventral; 137, left lateral. 138–140, Arc. flinti sp. nov. (Qld, Palmerston National Park, Tchooratippa Creek [PT-2007]): 138, ventral; 139, left lateral; 140, dorsal. 141–142, Arc. volsella sp. nov. (Qld, Queensland, Lamington National Park, Coomera Creek [PT-1013]): 141, ventral; 142, left lateral.143–145, Arc. nebo sp. nov. (Qld, Mt Nebo [PT-1096]): 143, dorsal;144, left lateral; 145, ventral.