Magadacerina, Malm, Tobias & Johanson, Kjell Arne, 2013

Malm, Tobias & Johanson, Kjell Arne, 2013, Magadacerina, a new genus of Leptoceridae (Trichoptera) from Madagascar, Zootaxa 3608 (3), pp. 215-220 : 216-217

Magadacerina , new genus

Figures 1–8

Type species. Magadacerina forcipata, Malm & Johanson , new species; by present designation.

Placed in tribe Blyzophilini Andersen, Kjaerandsen & Morse 1999 , for reasons stated in the Discussion section.

By having the tibial spur formula 2,2,2, the new genus is easily distinguished from most other Leptocerinae genera. It is distinguished from Poecilopsyche by having hind wings with stem of R1 fully developed, from Leptocerina by having hind wings without an expanded anal region and male genitalia with a narrow ventral part of segment IX, from Athripsodes and Ceraclea by having each forewing with a sessile fork of M, from Leptecho by having fork I present in the hind wing, from Axiocerina by having the forewing crossveins r-m and m - cu almost parallel and male genitalia without lateral bulbs on the inferior appendages, and from Blyzophilus by having male genitalia with the preanal appendages greatly produced posterad and forewings with the crossvein r-m not oblique.

Description. Male body. Colour yellowish brown (in alcohol). Head with prominent dorsolateral sulci, midcranial sulcus absent, anteromesal setal wart subtriangular with small circular mediolateral setal wart at each posterior corner ( Fig. 1 ). Tibial spur formula 2,2,2.

Male wings. Forewings narrow; R1 indistinct along the length of Sc; discoidal cell nearly as long as thyridial cell; forks I and V present, fork I petiolate; crossvein r-m and crossvein m-cu almost aligned; bifurcation of M sessile; Cu2 slightly sigmoid ( Fig. 2 ). Hind wings narrow, discoidal cell absent, forks I and V present, bifurcation of M sessile. Nygma in both wings located close to M1+2 ( Fig. 3 ).

Male genitalia. Segment IX short ventrally, slightly longer dorsally. Preanal appendages wide basally and fused with segment IX, posterodorsally produced into pair of long, digitate extensions, apically curving ventrad ( Figs 4–5 ). Tergum X directed posteroventrad before extending posterad into pair of dorsally curving lobes; fused basoventrally, greatly produced anterad into segment IX ( Fig. 6 ). Inferior appendages each with 2 dorsal lobes: medial lobe club-shaped, lateral lobe tapering to acute apex ( Fig. 4 ); basal plates merged with ventral ridge; curved anteroventrad ( Fig. 4 ; IA.b.p). Phallus sinuous in lateral view, with pair of stout paramere spines; phallobase 1/5th of total length; phallic shield covering basal part, apparently articulating with basal plate of inferior appendage, dorsal apex produced into spine-like process articulating with basoventral extension of tergum X ( Figs 7–8 ).

Etymology. Magada-, derived from Madagascar, the type country, and -cerina, from the Greek “keros” meaning “horn” (here “antenna”), following the suffix tradition of other leptocerine genera. Gender is feminine.

Figures

FIGURE 1. Magadacerina forcipata new genus, new species, male holotype. Head, pro- and mesothorax in dorsal view. Abbreviations: am. s. w. — anteromesal setal wart; d. l. s. w. — dorsolateral setal wart; l. s. — lateral sulcus; ml. s. w. — mesolateral setal wart; mn. — mesonutum; msc. — mesoscutellum; p. l. s. w. — posterolateral setal wart; pn. s. w. — pronotal setal wart.

FIGURES 2 – 8. Magadacerina forcipata new genus, new species, male holotype. 2 – 3. Right forewing (2) and hind wing (3). Abbreviations: C — costal vein, Sc — subcostal vein, R 1 – 5 — radial veins 1 – 5, M — media, M 1 + 2 — anterior median vein, MP — posterior median vein, Cu 1 – 2 — cubital veins (1 – 2), 1 – 2 A — first and second anal veins, I—apical fork 1, V—apical fork 5, Dc — discoidal cell, Tc — thyridial cell, ny—nygma, s — sectoral crossvein connecting R 2 + 3 with R 4 + 5, r – m — crossvein connecting R and M, m-cu — crossvein connecting M and Cu. 4 – 6. Genitalia in left lateral (4), dorsal (5) and ventral (6) views. Abbreviations: IX—segment IX, X—tergum X, IA—inferior appendage, IA. dl. — inferior appendage dorsolateral lobe, IA. dm. — inferior appendage median lobe, IA. b. p. — inferior appendage basal plates, IA. pr. — protuberance on inferior appendage, PA—pre-anal appendages. 7 – 8. Phallus in left lateral (7) and ventral (8) views. Abbreviations: Ph. b. — phallobase, Ph. sc. — phallothremal sclerite, Ph. sh. — phallic shield, p. s. — paramere spine.