Helicopsyche meander, Johanson & Pham, 2012

Johanson, Kjell A. & Pham, Hong-Thai, 2012, Three new species of Helicopsyche (Trichoptera, Helicopsychidae) from northern Vietnam, with a key to Helicopsyche species of Vietnam, European Journal of Taxonomy 6, pp. 1-10 : 5

publication ID

https://doi.org/ 10.5852/ejt.2012.6

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scientific name

Helicopsyche meander

sp. nov.

Helicopsyche meander sp. nov.

Fig. 2 View Fig


Helicopsyche meander sp. nov. is most similar to H. lamnata sp. nov., H. anaktangga Malicky, 1995 , H. anaksaku Malicky, 1995 , H. minyas Malicky & Nawvong ( Malicky et al. 2004) and H. cymodoce Schmid, 1993 , particularly due to the presence of two-segmented maxillary palps in combination with the nearly similar shape of the gonopods in lateral view. The new species is distinguished from H. anaktangga , H. anaksaku , H. minyas and H. cymodoce by the pointed apex of tergum X in lateral view; and from H. lamnata sp. nov., H. anaksaku and H. minyas by the more strongly S-shaped gonopods. It is furthermore separated from H. lamnata sp. nov. by the absence of a central posterior process of segment IX.


Meander, named after the shape of the gonopods, resembling a meandering river.

Material examined

Holotype ♂

VIETNAM: Vinh Phuc Prov, Me Linh District , stream near Ngoc Thanh Village , Melinh Station for Biodiversity , 21°23'28.2"N, 105°42'46.7"E, 233 m, Malaise trap 4-12 Apr. 2011, loc#VN001, leg. K.A. Johanson, P.H. Thai & T.T. Du ( NHRS, alcohol) [DNA voucher IP7].



MAXILLARY PALPS. Two-segmented, with distal segment slightly longer than basal segment. Pair of interantennal setal warts semi-spherical, elevated. Each scapus about as long as each basal segment of maxillary palps. Spur formula 1,2,4; each foreleg spur slightly shorter than each first tarsomere.

LENTH. Forewing 3.7 mm, hind wing 2.8 mm (N = 1).

MALE ABDOMEN AND GENITALIA. ( Fig. 2 View Fig ) Sternal process VI about one-eighth as long as sternum VI, straight, oriented posteroventrad; slightly tapering in lateral view ( Fig. 2A View Fig ); pointed in ventral view ( Fig. 2B View Fig ). Segment IX about 1.5 x taller than long in lateral view ( Fig. 2C View Fig ); each anterior lobe of segment IX ( Fig. 2C View Fig ) irregularly narrowing anteriorly in lateral view, asymmetrical, oriented anterad; anterodorsal margin almost straight; anteroventral margin concave ( Fig. 2C View Fig ); in dorsal view, inner margin forming narrowly ellipsoid cavity ( Fig. 2D View Fig ); in ventral view, without central posterior process ( Fig. 2E View Fig ); inner margin forming wide, almost rectangular cavity; lateral apodemes nearly horizontal ( Fig. 2C View Fig ), each parallel-sided along their length, meeting anterior margin; sub-marginal line present above lateral apodemes; tergal transverse apodemes present, fading immediately above superior appendages; sternal transverse apodeme present along posterior margin of segment IX ( Fig. 2C View Fig ). Transverse plate absent. Tergum X, in lateral view, oriented posteroventrad ( Fig. 2C View Fig ), slightly sigmoid, tapering towards mid-length, apex strongly club-shaped, slightly curving dorsally ( Fig. 2C View Fig ); in dorsal view ( Fig. 2D View Fig ), deeply and widely divided into pair of parallel-sided and parallel-running branches, with 3 pairs of equally long megasetae in apical group, starting well before apex of gonopods in lateral view ( Fig. 2C View Fig ). Superior appendages club-shaped ( Fig. 2C View Fig ), oriented ventrad. Primary branch of gonopods, in lateral view ( Fig. 2C View Fig ), with basal part oriented posterad before strongly bending dorsad, angling posterad at half-length, apical part produced mesad above tergum X; almost parallel-sided along their length; anterior margin smooth, strongly concave; dorsal and posterior margins undulating. Secondary branch of gonopods absent. Basomesal lobes long, tuboid, each with pair of apical setae; sigmoid in lateral view ( Fig. 2D View Fig ), parallel-sided with diverging apex in ventral view ( Fig. 2E View Fig ). Basal plate, in lateral view ( Fig. 2C View Fig ), curving anteroventrad, narrowing along its length from posterior to anterior end, slightly produced beyond anteroventral margin of segment IX in lateral view ( Fig. 2C View Fig ); widely triangular in ventral view ( Fig. 2E View Fig ). Phallic apparatus, lateral view, irregularly tube-shaped along its length ( Fig. 2F View Fig ), apex about as broad as base; nearly straight after mid-length; in ventral view, with basis narrow ( Fig. 2G View Fig ); widest after mid-length; endotheca weakly produced, posteroventral part not sclerotized, except single, weakly sclerotized triangular processes distally of phallic sclerite.


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