Arcyphysa hystricosa (Neboiss)

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 : 29-30

Arcyphysa hystricosa (Neboiss)

( Figs 110–111 , 150, 152–155 )

Diplectrona hystricosa Neboiss 1979 [1978], 832, figs 14–19.

Material examined. Holotype ♂, Queensland , North Stradbroke Island, Myora Springs, 28.xii.1977, A. Arthington (QM [T-5785]) . Paratypes, Queensland : 1♂ 1♀, Nth Stradbroke Island, Myora Springs, 3.ix.1974, A. Bensink [PT-512] ; 1♀, North Stradbroke Island , Myora Springs, 28.xii.1977, A. Arthington [T-5786] ; 1♀ [T-5788 PT-558] (QM, NMV). Queensland: 1♂, Blue Lake , Nth Stradbroke Island, 27.v.1973, H. Burton ; 2♂ 2♀, same locality and collector, 11.xi.1973 ; 1♂ 2♀, same locality and collector, 17.ix.1973 ; 1♂, Brown Lake , Stradbroke Island, 16.vi.1975, H. Burton.

Diagnosis. In the genitalia of males of Arc. hystricosa and Arc. fraserensis , abdominal segment IX and tergite X appear to be fused completely, each having, in lateral view, well-developed apicolateral processes that in Arc. hystricosa form an upper broad lobe and, below the level of the phallic apparatus, a short up-turned spine. In Arc. fraserensis the apicolateral processes each terminates in a shorter finger-like upwardly directed lobe, and the spine below the phallic apparatus is directed downward. In Arc. hystricosa the harpagones, in ventral view, are almost cup-shaped, rather than tapered as in Arc. diamontona and Arc. angusta . The females of Arc. hystricosa and Arc. fraserensis are closely similar.

Description (modified from Neboiss 1979, 832, figs 14–19). Length of each forewing: ♂ 6.8–8.2 mm (n = 7), ♀ 8.0– 9.9 mm (n = 6); forewing median cell only slightly longer than discoidal cell; fork 2 barely sessile, or sometimes with very short footstalk; cross-vein r-m at about middle of discoidal cell. Lateral filaments on segment V short.

Male (110–111, 153–154). In abdomen, reticulate-walled sacs in segments VI and VII large, ovoid, each extending about 3/4 distance into preceding segment. Genitalia: Segment IX broad, robust, with wide U-shaped lateral excision; in lateral view, anterolateral angles bluntly rounded and densely covered with short, stout spicules; group of bristles located on outer margin on either side, up-turned spine on each mesolateral margin, situated just below phallus; tergite X hood-shaped, lateral margins each covered with scattered group of short peg-like spines; pointed processes arising from lower apical margins of tergite; gonopods each with coxopodite stout, slightly curved, broadest at base, length about 2.5x maximum width; harpago short, broad, almost cup-shaped in ventral view; phallic apparatus without parameres, straight, with apex obliquely truncate.

Female. Abdomen terminating bluntly; pair of cerci and both pairs of terminal protuberances small. Sternite VIII formed by 2 ventrolateral plates covering inferior appendage receptacle grooves, fully divided mesally, distal margin deeply and widely excised; apicolateral angles broadly rounded.

Distribution. Recorded only from Stradbroke Island.

Remarks. Neboiss (1979) noted that this species ‘appears to be related to’ Arc. rossi , but that the genitalia of the two species differ. In the same work, among ‘Other material examined’ Neboiss listed one male and two females from Fraser Island. These are assigned here to Arc. fraserensis sp. nov.

Figures

FIGURES 110–116. Arcyphysa gen. nov. spp., diagnostic features. 110–111, Arc. hystricosa (Neboiss 1979) (Qld, North Stradbroke Island [PT-512]): 110, ventral; 111, left lateral. 112, Arc. satana (Mosely 1953; N Qld, Crystal Cascades, Trib. Crystal Creek), ventral. 113–115, Arc.candela sp. nov. (NSW, Brown Mountain [PT-1017]): 113, left lateral; 114, ventral; 115, dorsal. 116, Arc. diamontona sp. nov. (Vic., Diamond Creek, 7 km SE of Gembrook [PT-1047]), ♀ terminal abdominal segments, left lateral.

FIGURES 146–163. Arcyphysa gen. nov. spp., ♂ diagnostic features. 146–150, heads, dorsal: 146, Arc.angusta (Banks 1939; [PT-1005]); 147, Arc. carnarvona sp. nov. (Qld, Carnarvon Gorge); 148, Arc. satana (Mosely 1953; N Qld, Crystal Cascades, Trib. Crystal Creek); 149, Arc. diamontona sp. nov. [PT-1047]; 150, Arc. hystricosa (Neboiss 1979; Qld, North Stradbroke Island [PT-512]). 151, Arc. diamontana (Vic., Diamond Creek, 7 km SE of Gembrook), ♂ right fore- and hind wings, dorsal. 152–153, Arc. hystricosa [PT-512]: 152, antennal segments; 153, maxillary palp. 154–163, ♂ genitalia. 154–155, Arc. hystricosa [PT-512]: 154, ventral, and 155, left lateral; 156–157, Arc. satana (N Qld, Crystal Cascades, Trib. Crystal Creek): 156, ventral, and 157, left lateral; 158–159, Arc. angusta (NSW, Styx R. [PT-1005]): 158, ventral, and 159, left lateral; 160– 161, Arc. candela sp. nov. (NSW, Brown Mountain [PT-1017]): 160, ventral, and 161, left lateral; 162–163, Arc. diamontona [PT-1047]:162, ventral, and 163, left lateral. Scale bar = 2 mm. Abbreviations: ac = anal cell; alp = apicolateral process; A 1+2+3 = fused anal veins A 1, A 2, A 3;dc = discoidal cell; dalw = divided anterolateral wart; cox = coxopodite; mc = mediancell; har = harpago; ph = phallic apparatus; pw = posterior wart; X = abdominal segment X.