Arcyphysa volsella,

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

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Arcyphysa volsella

sp. nov.

Arcyphysa volsella  sp. nov.

( Figs 141, 142View FIGURES 132–145)

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, 142View FIGURES 132–145): 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.


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