Chimarra antsymeloka, Gibon, 2015

Gibon, François-Marie, 2015, The Chimarra minima group in West Africa and Madagascar (Trichoptera, Philopotamidae), Zoosystema 37 (2), pp. 333-350 : 336-339

Chimarra antsymeloka n. sp.

( Fig. 5 A-F)

TYPE MATERIAL. — Holotype: Madagascar, Ambatandrano River (tributary of the Namorona) at Ambatandrano, 47°26’32”E, 21°14’45”S, 775 m. a.s.l., 17.IV.1994, 1 ♂ (2 slides: Phallic apparatus / abdominal segments VII-X, head and thorax in alcohol) ( MNHN).

Paratypes: Same data, 4 ♂ (ethanol). – RN25 between Ranomafana and Ifanadiana on the Namorona, 47°31’46”E, 21°16’40”S, 580 m. a.s.l., 21.IV.1994, 8 ♂ (ethanol) ( CBGP).

TYPE LOCALITY. — Madagascar, Ambatandrano River (tributary of the Namorona) at Ambatandrano, 47°26’32”E, 21°14’45”S, 775 m. a.s.l.

A

B

C

DISTRIBUTION. — Madagascar.

ETYMOLOGY. — Named after the Malagasy words antsy = knife and meloka = curved, in reference to the shape (sickle) of tergum X in dorsal view.

DIAGNOSIS. — The two Malagasy species, C. antsymeloka n. sp. and C. vulgaris n. sp., belong to subgroup 1, with a latero-ventral lobe sheet or leaf-shaped. Both have an endothecal spine, straight (not curved as in continental species. The two lateral rods of the phallotheca are smaller than in the other species; they are thick with a wrinkled appearance in C. antsymeloka n. sp., thinner and spine-shaped in C. vulgaris n. sp. The apex of the latero-dorsal lobes of the tergum X are acute in C. antsymeloka n. sp., truncate in C. vulgaris n. sp.

DESCRIPTION

Size: forewing 4.5 mm, hindwing 3.7 mm. Preanal appendages small, setose, wineskin-shaped. Inferior appendages massive in lateral view, dorsal branch strong, short, triangular when viewed dorsally; internal process long and narrow, inserted just below the dorsal branch. Latero-dorsal lobe of tergum X strong, distal part curved, with pointed distal extremity; small pointed projection inserted at mid-length on the outer edge; sickle-shaped when viewed dorsally. Latero-ventral lobe of tergum X sheet like, long, somewhat triangular on lateral view. Lateral rods of Phallotheca short, strong, curved ventrad with a wrinkled appearance. Endothecal spine present small, straight. Phallotremal sclerite large; when dorsally viewed, trident-shaped with two symmetric latero-dorsal branches and one slightly shorter, centro-ventral branch.

Figures

FIG. 5. — A-F, Chimarra antsymeloka n. sp.: A, inferior appendage, dorsal view; B, segments IX and X, lateral view; C, tergum X, dorsal view; D, Chimarra antsymeloka n. sp., specimen from the Efaho River (near Ifarantsa), tergum X, dorsal view; E, Chimarra antsymeloka n. sp., specimen from the Menarandra River (near Tranoroa), tergum X, dorsal view; F, phallic apparatus, lateral view; G, Chimarra ambaja Mosely, 1939, segments IX and X, lateral view. Scale bar: 0.1 mm.