Magadacerina forcipata, 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 : 217-220

Magadacerina forcipata , new species

Figures 1–8

Male body. Colour yellowish brown (in alcohol). Head with two prominent dorsolateral sulci, midcranial sulcus absent; anteromedian setal wart subtriangular, with one small, almost circular mediolateral setal wart at each posterior corner; oblong dorsolateral setal warts following eye margin, almost merging with posterolateral setal warts ( Fig. 1 ); maxillary palps missing (broken), labial palps each with 3 segments. Pronotum with pair of lateral setal warts; mesonotum with pair of dorsolateral lines consisting of setiferous punctures, nearly in continuation with punctures on mesoscutellum. Tibial spur formula 2,2,2.

Male wings. Forewing length 6–7 mm (broken), light straw colour, narrow. R1 basally indistinct, reaching wing margin closer to R2 than to Sc; discoidal cell almost as long as thyridial cell; forks I and V present; fork I petiolate, stalk almost as long as R2; crossvein r-m emerging slightly more than its length basad of crossvein s, directed posterad, joining M1+2 shortly after split from M3+4, bifurcation of M sessile; nygma located close to M1+2, almost in line with bifurcation of fork I; crossvein m-cu emerging at about 1/4th its length into M3+4, slightly slanted; Cu2 slightly sigmoid ( Fig. 2 ).

Hind wing 5 mm long (broken), narrow, more than 3 times longer than wide, R1 meeting wing margin close to R2, forks I and V present; fork I petiolate, with stalk longer than fork; discoidal cell absent; bifurcation of M sessile, crossvein r-m emerging at about half its length into R4+5, meeting M at about twice its length into M1+2; nygma located close to M1+2; Cu1 dividing shortly basad of bifurcation of M ( Fig. 3 ).

Male genitalia. Segment IX (IX) slightly wider dorsally, somewhat produced posterad at mid-ventral part ( Fig. 4 ), excised at anterior margin mid-ventrally ( Fig. 6 ) and mid-dorsally ( Fig. 5 ). Preanal appendages (PA) setose, fused with segment IX, expanded anteroventrally, almost reaching mid-height of segment IX; well developed posterad, forming pair of digitate extensions, apices curving ventrad, each apex with dense patch of setae present anteroventrally ( Fig. 4 ). Tergum X (X) long, directed posteroventrad at dorsobasal 1/3rd before turning posterad ( Fig. 4 ); apical half divided into 2 distinct lateral lobes ( Fig. 6 ), each lobe dorsally setose, excised laterally before ending in dorsally curving, slightly thickened knob without setae; ventrolateral bases fused, produced anterad into segment IX, sclerotised ( Fig. 4 ); fused base almost parallel-sided in lateral view ( Fig. 4 ), anterior apex produced dorsad and somewhat “human foot”-like, fused to thin, sclerotised structures originating mesally of preanal appendages; fused base almost parallel-sided in ventral view ( Fig. 6 ), slightly narrowing apically, apex blunt, somewhat concave. Inferior appendages (IA) wide basally, almost flat in ventral view ( Fig. 6 ); each with short basoventral bulge in lateral view ( Fig. 4 ), narrowing dorsoapically; posteromedially with small, posterad-directed protuberance (IA.pr); each appendage apicodorsally with medial and lateral lobes; medial lobe (IA.dm) tapering at base before widening to slightly knobbly, club-shaped apex; lateral lobe (IA.dl) tapering into acute apex, with rightangled lateral bend at mid-length ( Fig. 6 ); basal plate (IA.b.p) curving ventrad, forming semicircle in lateral view ( Fig. 4 ), fused medially to ventral ridge; apex concave in ventral view ( Fig. 6 ). Phallus sinuous, basal part directed anterodorsally, bending sharply at basal 2/5th, apical half tubular; paramere spines (p.s.) strong, tapering, originating about at mid-length ( Fig. 7 ); phallothremal sclerite (p.sc.) oval, hollowed, indistinct; phallobase (Ph.b.) covering basal 1/5th; phallic shield (Ph.sh.) almost enveloping phallobase, posterobasally apparently articulating with basal plate of inferior appendages, in ventral view widening anteriorly, almost rectangular ( Fig. 8 ), dorsal apex forming stout, spine-like process in lateral view, articulating with anteriorly produced ventral base of tergum X ( Figs 3, 7 ).

Holotype male: Madagascar: Finarantsoa Prov., Ranomafana, Malaise trap near river in tropical forest, 12–20.xii.1999, 1150 m, 21.2554°S, 47.4552°E [M.E. Irwin & E.I. Schlinger]

1 male paratype: Madagascar: Fianarantsoa, Matsiatra Ambony, Ranomafana NP, Namorona river, 1.8 km from Vohiparara, - 21.24032°S, 47.39186°E, 1130 m, 30.x.2011, 22W black light, stony river bank, Field# MAD11- 61, Leg. J. Bergsten, R. Bukontaite, T. Ranarilalatiana, & J.H. Randriamihaja. Collecting Permit: No 250/11/MEF/ SG/DGF/DCB.SAP/SCB. Export Permit: No 143N-EA11/MG11

Etymology. Forcipata , from Latin “ forceps ”, named after the pincer-like appearance of the preanal appendages together with tergum X.

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.