Arcyphysa angusta

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 : 25-27

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Arcyphysa angusta


Arcyphysa angusta   Group

( Figs 104–105 View FIGURES 102–109 , 146, 158–159 View FIGURES 146–163 , 179–180)

Arcyphysa angusta (Banks)  

Diplectrona angusta Banks 1939   , 495; Mosely & Kimmins 1953, 337.

Material examined. Holotype ♂, Dorrigo, NSW ( ANIC, ex MCZ 22087 View Materials ); 1♂, 2♀, NSW, Styx River, 12 km S of Ebor, 17.x.1973, A. Neboiss ( NMV [PT-1005]).

Diagnosis. This species resembles Arcyphysa diamontona   sp. nov. in having the gonopods in ventral view widely bowed, but is distinguished from Arc. diamontona   by having dorsal processes clearly arising on abdominal tergite IX and lanceolate, not club shaped, and by lacking sharp spines apicolaterally on sternite IX; harpagones are leaf-like, rounded apically, not acute as in Arc. diamontona   .

Description. Length of each forewing: ♂ 10.0 mm (n = 2), ♀ 10.4 mm (n = 2); forewing median cell length about 5x maximum width.

Male. Abdomen with internal reticulate-walled internal sacs all elongate oval, about length of segments.

Male genitalia ( Figs 104–105 View FIGURES 102–109 , 158–159 View FIGURES 146–163 ): Segment IX short, apicolaterally expanded distally to form subtriangular lobe; apicolateral processes elongate, lanceolate, about twice length of tergite X, in ventral view with convergent club-shaped lobes densely clothed in short setae; tergite X compressed, taller than long; phallic apparatus without parameres, in ventral view wide at base, in lateral view with apex curved downward; gonopods each with coxopodite stout, strongly curved in ventral view, width almost equal throughout length, harpagones leaf-shaped, about 1/3 length of coxopodites, curved gently, tapered to rounded apices.

Female ( Figs 179–180 View FIGURES 179–187 ). Abdomen terminating bluntly; distally with pair of cerci and 2 pairs of small terminal protuberances; sternite VIII formed by 2 ventrolateral plates (valves) covering inferior appendage receptacle grooves, fully divided mesally, apicolateral angles produced, broadly rounded; segment IX with rounded sclerotic cavity, its inner surface granular.

Distribution. Collected only from north-eastern New South Wales.

Remarks. Banks (1939, 495) interpreted the paired apicolateral structures in Arc. angusta   as part of the ‘superior plate’. Here these structures are interpreted as apicolateral processes on abdominal tergite IX. The arrangement in Arcyphysa angusta   contrasts with the arrangement in Arc. diamontona, Arc.   hystricosa   , and Arc. fraserensis   in which abdominal segment IX and tergite X appear to be fused, with the result that the apicolateral lobes appear to arise from the fused structure.


Royal Botanic Gardens, National Herbarium of New South Wales


Australian National Insect Collection


Museum of Comparative Zoology


Museum Victoria














Arcyphysa angusta

Wells, Alice & Contents, Arturs Neboiss Table Of 2018

Diplectrona angusta

Banks 1939