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Androdeloscia bicornuata sp. nov. (Figs 1–4, 13A) Material examined. Holotype: Male (INPA 2535), Brazil, Amazonas, Manaus, Reserva Florestal A. Ducke: solid ground, 2º55’S, 59º59’W, Sep. 8, 1982, J. Adis et al. col. Paratypes: 2 males, 5 females (LABISO-UECE 0085), same locality as for holotype, Jun. 9, 1983; 2 males, 1 female (MZUSP 41606), same data as for holotype; 1 male (LABISO-UECE 0086), same locality as for holotype, Aug. 9, 1983; 1 male (INPA 2536), same locality as for holotype, Aug. 9, 1983; 1 male (INPA 2537), same locality as for holotype, Oct. 13, 1982; 1 male (INPA 2538), same locality as for holotype, Dec. 18, 1981; 1 male, 2 females, 2 young individuals (CRUST. UFPB 7403), same locality as for holotype, Mar. 13, 1983; 1 male, 4 females (INPA 2539), same locality as for holotype, Aug. 9, 1983; 3 males, 1 female (INPA 2540), same locality as for holotype, Jul. 11, 1983. Etymology. The species name is reference to two apical horn-shaped lobes in male pleopod I endopod. Diagnosis. Eyes with eight light brown ommatidia. First antenna distal article with two apical aesthetascs separated by wide gap from group of six subapical aesthetascs. First maxilla outer endite with 4 simple + 4 bifid teeth, lateral margin fringed with setae, concavity absent. Left mandible with 4 penicils and right mandible with 5 penicils on molar process. Male pleopod I endopod distal portion complex, apex with two horn-like tips and hyaline lamellae; exopod with inner margin straight, rounded portion expanded proximally. Male pleopod V exopod with elongate tip. Description. Largest male (Fig. 1B), 3 mm in length, 1 mm in width; largest non-ovigerous female, 3.5 mm long, 1 mm wide. Habitus narrow, pigmented light brown (Fig. 13A). Cephalothorax not involved by pereonite 1; frontal and lateral lobes slightly developed; linea frontalis absent; linea supraantennalis bent downwards in middle (Fig. 1A); eyes with eight light brown ommatidia. Pereon with noduli laterales flagelliforms, peak of coordinates b/c and d/c on coxal plate 4 (Fig. 1E). Pereonite 1 with anterior margin nearly straight; pereonite coxal plates 6–7 with conspicuous tips. Pleon narrower than pereon (Figs 1B, 13A). Pleon epimera 3–5 with very small tips (Figs 1B, 13A). Pleotelson triangular with rounded apex, lateral margins slightly convex (Figs 1B, 13A). First antenna three-jointed (Fig. 1C), distal article with two apical aesthetascs separated by wide gap from group of six subapical aesthetascs. Second antenna (Fig. 1D) with flagellum of three articles, subequal in length, apical organ longer than third article. Mandibles hairy lobe with two conspicuous setae, two penicils on left mandible (Fig. 2A) and one penicil on right mandible (Fig. 2B); one penicil between molar and incisive processes; molar process with four-branched penicils on left mandible (Fig. 2A), five-branched penicils on right mandible (Fig. 2B). First maxilla inner endite (Fig. 2D) with two penicils, small spine-like seta on laterodistal corner; outer endite (Fig. 2C) with 4 simple + 4 bifid teeth. Second maxilla (Fig. 2E) inner and outer lobes hairy; inner lobe detached from outer lobe, with eight thick setae; outer lobe with three thick setae close to inner lobe. Maxilliped (Fig. 2F) basis with some conspicuous setae and sulcus lateralis; palp with one large seta on proximal article; endite subrectangular, setose, with two setae in distal portion and without penicil. Pereopods with strong and slender spine-like setae; dactylar seta simple; inner claw very short. Pereopod I (Fig. 4A, C) merus with one trifid seta; carpus with antennal brush, ornamental sensory spine serrate, and three trifid setae. Pleopod exopod respiratory areas not discernible. Pleopod V exopod (Fig. 3F, H) triangular, bearing conspicuous transversal field of setae and hairy groove along medial margin. Uropod endopods smaller than exopods, endopods inserted proximally. Male. No apparent sexual dimorphism on pereopod I and VII (Fig. 4A–D), except for small differences in size, number and topology of spine-like setae. Pleopod I endopod (Fig. 3B, C) with complex distal portion, bearing two projected tips (Fig. 3C), bent laterally and “hyaline lamellae” lobed and crenulated; there is big lateral lobe distally directed in half length (Fig. 3B); exopod (Fig. 3A) inner margin straight; rounded portion expanded proximally (expanded latero-distally in female; Fig. 3G). Pleopod II endopod (Fig. 3D) distal half flagelliform; exopod (Fig. 3E) subtriangular, longer than wide, two simple setae on outer margin, several pectinate setae on inner and distal portion. Pleopod V exopod (Fig. 3F) distally elongated into pronounced tip (not in female; Fig. 3H); hairy groove along inner margin for fitting endopod of pleopod II and two simple setae (bifurcate in female; Fig. 3H) on outer margin. Remarks. Androdeloscia bicornuata sp. nov. differs from all other species of genus by distinct morphology of complex distal portion of male pleopod I endopod bearing two horn-like tips. |
