The Chimarra minima group in West Africa and Madagascar (Trichoptera, Philopotamidae) Author Gibon, François-Marie text Zoosystema 2015 2015-06-30 37 2 333 350 http://dx.doi.org/10.5252/z2015n2a3 journal article 10.5252/z2015n2a3 1638-9387 5155852 urn:lsid:zoobank.org:pub:CF42741C-5316-48DF-B2FF-F85540EFF5C0 Chimarra sanagae n. sp. ( Fig. 7 A-D) TYPE MATERIAL. — Holotype : Cameroon , Sanaga River at Sakbayémé , 4°2’3”N , 10°32’44”E , 9.III.1989 , F.-M. Gibon , 1 ♂ (2 slides: wings and phallic apparatus / head, thorax and abdomen) ( MNHN ). Paratypes : Small tributary of the Sanaga River between Sakbayémé and Song-Loulou, 4°4’42”N , 10°25’20”E , 10.III.1989 , F.-M. Gibon, 1 ♂ (3 slides: phallic apparatus / abdomen / head and thorax) ( CBGP ). - Sanaga at Song-Loulou, 4° 5’20.45”N , 10°27’19.89”E , 6.XII.1989 , F.-M. Gibon, 1 ♂ (ethanol) ( CBGP ). TYPE LOCALITY. — Cameroon , Sanaga River at Sakbayémé, 4°2’3”N , 10°32’44”E . ADDITIONAL MATERIAL. — Cameroon , Ngoué River near Pouma (Nyong River bassin), 3°61’7.60”N, 10°31’26.35”E , 17.XII.1989 , F.-M. Gibon, 8 ♂ (ethanol) ( CBGP ). DISTRIBUTION. — Cameroon . ETYMOLOGY. — Named after the Sanaga River (central Cameroon ). DIAGNOSIS. — Chimarra loffae n. sp. belongs to the subgroup 1, with a latero-ventral lobe sheet or leaf-shaped. It is distinguished from C. prodhoni , the other species of the subgroup, by the wide base of the latero-ventral lobe of tergum X and by the absence of an endothecal spine. DESCRIPTION. Size: forewing 3.9 mm , hindwing 3.2 mm . Preanal appendages small, setose with wrinkled aspect. Inferior appendages massive, dorsal branch strong, elongate, with a line of stout setae; internal process protruding, ventrally inserted, small but larger than in C. loffae n. sp. Latero-dorsal lobes of tergum X stout, hook-shaped, curved outward, shorter than latero-ventral lobe. Latero-ventral lobes of tergum X: base wide, almost triangular in lateral view, apically extending as a sclerotized, slightly ventrad curved, finger-shaped rod. Lateral rods of phallotheca, long, stout, strongly curved ventrad, distal third with a wrinkled appearance. Endothecal spine absent. Phallotremal sclerite small, with indiscernible structure.