Androdeloscia paraleilae Grangeiro & Souza & Christoffersen 2021, sp. nov.

Androdeloscia paraleilae sp. nov.

(Figs 5−8, 13B)

Material examined. Holotype: Male (INPA 2541), Brazil, Amazonas, Manaus, Januari lake: mixed water, 3º20’S, 60º17’W, May 16, 1988, J. Adis et al. col. Paratypes: 2 males (INPA 2542), same data as for holotype; 1 male, 3 females, 1 young (INPA 2543), same locality as for holotype, May 31, 1988; 2 males, 2 females (LABISO-UECE 0087), same locality as for holotype, May 31, 1988; 1 female (MZUSP 41607), same locality as for holotype, Jun 31, 1988; 1 male (MZUSP 41608), Brazil, Amazonas, Manaus, Tarumã Mirim river: secondary forest, 3º02’S, 60º17’W, Jun 15, 1988, J. Adis et al. col.; 1 male (CRUST. UFPB 7404), same data as before.

Etymology. The species name is reference to A. leilae since they both present similar concavity on lateral margin of first maxilla.

Diagnosis. Eyes with ten black ommatidia. First antenna distal article with two apical aesthetascs separated by gap from group of six subapical aesthetascs. First maxilla outer endite with 4 simple + 5 teeth (4 bifid, 1 simple, slender); concavity in lateral margin fringed with setae present. Mandibles with 6 penicils on molar process. Male pleopod I endopod distal portion simple, apex tip curved with serrate inner margin; exopod inner margin convex, rounded portion expanded laterally. Male pleopod V exopod without elongate tip.

Description. Largest male (Fig. 5B), 3.5 mm in length, 1 mm in width; largest non-ovigerous female, 5.1 mm long, 2 mm wide. Habitus narrow, pigmented dark brown (Fig. 13B). Smooth tergal surface. Cephalothorax not involved by pereonite 1; frontal and lateral lobes little developed; linea frontalis absent; linea supraantennalis straight in middle (Fig. 5A); eyes with ten black ommatidia. Pereon with noduli laterales flagelliforms, peak of coordinates b/c and d/c on coxal plates 1 and 4, respectively (Fig. 5E). Pereonite 1 with anterior margin nearly straight; pereonite coxal plates 6−7 with conspicuous tips. Pleon narrower than pereon (Figs 5B, 13B). Pleon epimera 3–5 with very small tips (Figs 5B, 13B). Pleotelson triangular with slightly rounded apex, lateral margins little convex (Figs 5B, 13B).

First antenna three-jointed (Fig. 5C), distal article with two apical aesthetascs separated by wide gap from group of six subapical aesthetascs.

Second antenna (Fig. 5D) with flagellum of three articles, distal article longest, proximal and median articles subequal in length; apical organ subequal in length to third article of flagellum; aesthetascs not seen in flagellum.

Mandibles hairy lobe with two conspicuous setae, two penicils on left mandible (Fig. 6A) and one penicil on right mandible (Fig. 6B); one penicil between molar and incisive processes; molar process with six-branched penicils (Fig. 6A, B).

First maxilla inner endite (Fig. 6D) with two penicils, small spine-like seta on laterodistal corner; outer endite (Fig. 6C) with lateral margin fringed, bearing concavity (similar to that is found in A. leilae); 4 simple + and 1 simple, slender seta (versus 4 bifid, in A. leilae).

Second maxilla (Fig. 6E) inner and outer lobes hairy; inner lobe detached from outer lobe, with eight thick setae; outer lobe with conspicuous transversal rows of pectinate scales and two thick setae, close to inner lobe.

Maxilliped (Fig. 6F) basis with some conspicuous setae and sulcus lateralis; palp with one large seta on proximal article; endite subrectangular, setose, with one seta in distal portion and without penicil.

Pereopods with strong and slender spine-like setae; dactylar seta simple; inner claw very short. Pereopod I (Fig. 8A, C) carpus with antennal brush, ornamental sensory spine serrate, and three trifid setae.

Pleopod exopod respiratory areas not discernible. Pleopod V exopod (Fig. 7E, G) triangular, bearing groove along medial margin without setae.

Uropod endopods smaller than exopods, endopods inserted proximally.

Male. Pereopod I (Fig. 8A) merus with one trifid seta (two in female; Fig. 8C). There may be small differences in size, number and topology of spine-like setae. Pereopod VII (Fig. 8B) seems more setose than in female (Fig. 8D). Pleopod I endopod (Fig. 7B) with simple distal portion, without hyaline lamellae; apex represented by small curved tip, inner margin serrate; exopod (Fig. 7A) inner margin convex (straight in female; Fig. 7F); rounded portion expanded laterally. Pleopod II endopod (Fig. 7C) distal part flagelliform; exopod (Fig. 7D) subtriangular, longer than wide, three setae on outer margin (two simple, one bifurcate) and row of small thin inconspicuous setae along inner margin. Pleopod V exopod (Fig. 7E) without elongate tip, bearing groove along inner margin for fitting endopod of pleopod II and two bifurcate setae on outer margin (Fig. 7E).

Remarks. Androdeloscia paraleilae sp. nov. differs from all other species of genus by distinct morphology of simple distal portion of male pleopod I endopod bearing small curved tip and serrate inner margin. Androdeloscia paraleilae sp. nov. and A. leilae are only two species of genus that present concavity on lateral margin of first maxilla, but A. paraleilae sp. nov. differs from A. leilae by: a) subapical aesthetascs on first antenna, six (vs. nine); b) 6 penicils on right mandible (vs. 7); c) penicils of inner endite of first maxilla setose (vs. only slightly setose); d) inner endite of first maxilla with apical tip (vs. without); e) outer endite of first maxilla with 4 simple + 5 teeth – 4 bifid and 1 simple, slender (vs. 4+4 teeth, inner set bifid); f) merus of pereopod VII without (vs. with) one lobe on distal outer region; g) exopod of pleopod V without (vs. with) elongate apex.