Orthotrichia apophysis Zhou & Yang

Lei, Zhou, Lian-Fang, Yang & Morse, John C., 2010, Six new species and 1 new species record of Orthotrichia (Trichoptera: Hydroptilidae) from China, Zootaxa 2560, pp. 29-41 : 30-31

Orthotrichia apophysis Zhou & Yang , sp. nov.

Figs 1–6

Material. Holotype ɗ, Jiangxi Province, Jiu Lian Shan National Nature Reserve, Da-Qiu-Tian, 8.2 km northwest of Da-Qiu-Tian (114°25'50"E, 24°34'15"N), elev. 425 m, 2005-vi-10, Coll. Zhou Xin. Paratypes: 7mɗ, Guangxi Zhuang Autonomous Region, Yang-shuo County, Jin-bao He, 1.6 km upstream of Jin-bao town (110°18'39"E, 24°47'44"N), elev. 192 m, 2004-vi-18, Coll. Sun Chang-Hai, Zhou Xin.

Etymology. The Greek " apophysis " means "offshoot, process", in reference to the prominent dorsal spines of tergum X of this new species.

Description. Male. Antennae about 40-segmented. Forewing length 2.5 mm. Ventral process of abdominal segment VI absent. Ventral process of segment VII short, capitate, with ventral surface of “head” densely covered with clublike setae ( Fig. 6 ).

Male genitalia ( Figs 1–6 ). Anterior margin of segment IX excised in shallow arc in dorsal view ( Fig. 3 ), deeply excised in U shape laterally ( Fig. 1 ), leaving venter of IX as triangular plate ( Fig. 4 ); posterolateral processes of segment IX (p.l. pr.) each symmetrical, broad, leaflike ( Figs 1, 2 ), almost as long as tergum X in dorsal view ( Fig. 3 ). Tergite X fused with segment IX, about 1/3rd as broad as tergum IX ( Fig. 3 ); dorsal spine (d. s.) of X apparently arising from tergum IX, left one stout and hooked, produced subapically from left margin with its apex directed dorsomesad; right one long and slender, slightly curved mesad, with apex abruptly narrowed to acuminate tip ( Fig. 2 ). Inferior appendages (inf. app.) symmetrical, short and stout in ventral view ( Fig. 4 ), bulbous, as long as wide, with basal halves fused with each other, each with acute apex directed mesad. Bilobed process (bil. pr.) composed of pair of short cylindrical rods at base of inferior appendages, only visible in lateral view ( Figs 1, 2 ). Paramere spine (pa.) long, about 2/3rds as long as genitalia. Phallus ( Fig. 5 ) slender, with basal portion about 2 times as long as distal portion, its apex slightly enlarged, titillator (tit.) circling segment 1 time.

Diagnosis. This species belongs to the Or. angustella Group. It is similar to Or. bencana in the general shapes of the posterolateral processes of segment IX and the inferior appendages, but differs in that 1) tergum X has dorsal spine (without dorsal spine in Or. bencana ) and 2) a titillator encircles the phallus 1 time. (without titillator in Or. bencana ).

Distribution. Type locality only.

Figures

FIGURES 1 – 6. Orthotrichia apophysis, sp. nov., male genitalia. 1, left lateral view; 2, right lateral view; 3, dorsal view; 4, ventral view; 5, phallus; 6, left lateral view of ventral process of segment VII. Abbreviations explained in text.