Kaaetecarcinia karaja Cardoso, Bento & Ferreira, 2026, gen. et sp. nov.

Kaaetecarcinia karaja gen. et sp. nov. urn:lsid:zoobank.org:act: 0999CA88-F3B7-4B8A-96F5-EB14E90F0E54 Figs 1, 8E–G, 9–11C Diagnosis Male pleopod I uniramous with ramus long, styliform, longer than pleopod II; male pleopod II uniramous with ramus robust, ramus basal part as wide as apex, with one seta, apex with one acute lobe directed inward. Etymology The specific epithet ‘ karaja ’ refers to the indigenous tribe that inhabits the region that bears the same name, Serra de Carajás (Carajás Mountain Range). Type material Holotype BRAZIL – Pará State • ♂; Parauapebas municipality, Serra Norte plateau, N5S_057 cave; 6.1084° S, 50.1325° W; 25 Aug.–3 Sep. 2009; R Andrade leg.; ISLA, ISLA96902. Paratypes BRAZIL – Pará State • 1 ♂; same data as for holotype; ISLA, ISLA96901 • 2 ♀♀; same data as for holotype; N5S52/53 cave; 6.1074° S, 50.1332° W; 25 Aug.–3 Sep. 2009; R Andrade leg.; ISLA, ISLA96903 • 1 ♀; same data as for holotype; N4E89 cave; 6.0330° S, 50.1517° W; 19 Feb.–4 Mar. 2010; R Andrade leg.; ISLA, ISLA96904. Description Maximum body length of 2 mm, approximately 3 × as long as wide (Figs 8E, 9A). Pereonites subtrapezoidal, with rounded posterior margins, seven setae on lateral margins, pereonite IV widest (Fig. 9A, C). Pleonites II and III about 50% and 90% of pereonite VII length, respectively, pleonites III–V with three setae laterally (Fig. 9A). Pleotelson (Figs 8F, 9A) length 20% of body length and about 60% longer than pleon, as wide as long, with 13 setae laterally, apex with two sets of four setae. Antennula (Fig. 9B) longer than peduncle of antenna, peduncle of three articles, flagellum of one article with one simple seta and aesthetasc, shorter than flagellum. Antenna (Fig. 9B) long, about 50% of body length, reaching pereonite VI, peduncle of five articles, flagellum with 16–19 articles. Mandibles (Fig. 9D) lacinia mobilis with denticulate apex, right and left incisor with four teeth, spine row reduced to one seta, pars molaris as tuft of setae with five branches. Maxillula (Fig. 9E) endite with two robust simple setae and two robust pappose setae; exite margin with one robust seta plus four robust serrate setae and three robust simple setae. Maxilla (Fig. 9F) endite, apex setose with one serrate seta; exite medial and lateral rami with 12 and 13 serrate setae respectively. Maxilliped (Fig. 9G) endite proximal lobe with eight pappose setae, apex with two pappose setae, medial margin with two pappose setae and four pappose on lateral margin; palp of five articles, first article fused with maxilliped body, articles with long simple setae, article 5 smallest, with tuft of setae distally. Pereopod I (Fig. 10A) stocky; propodus 2.5 × as long as carpus, inferior margin with three serrate setae; carpus with serrate setae on inferior margin and on anterodistal angle; dactylus ½ of propodus length, reaching distal margin of carpus, unguis shorter than dactylus length. Pereopod II (Fig. 10B) carpus longer than propodus, anterodistal angle with one plumose seta; dactylus shorter than propodus. Pereopod VII (Fig. 10C) 2 × as long as pereopod I, merus with cuspidate setae with accessory seta; propodus longer than carpus with cuspidate setae with accessory seta; unguis as long as dactylus length. Mature male (Figs 8G, 10D–E) Body length of 1.6 mm. Antennal flagellum with 16–17 articles. Genital papilla (Fig. 10D) with one lobe on articulating membrane between pereonite VII and pleonite I. Pleopod I (Figs 8G, 10D) uniramous, base rectangular, endopod long, styliform, longer than pleopod II. Pleopod II (Figs 8G, 10D–E) uniramous, protopodite rectangular; endopod robust, basal part as wide as apex, with one medial seta, apex with one acute lobe directed inward. Pleopods III–IV exopods ovoid, progressively longer than wide, with 4–5 plumose setae distally. Immature male (Fig. 10F–H) Body length of 2 mm. Antennal flagellum with 19 articles. Pleopod I (Fig. 10F) base rectangular, longer than wide, biramous; inner ramus short, with one plumose seta; exopod longer than wide, with four plumose setae on apex. Pleopod II (Fig. 10G) base rectangular, biramous; endopod short, with one plumose seta; exopod ovoid, distal margin with four plumose setae. Pleopods III–V (Fig. 10G) exopods ovoid, progressively longer than wide, with 4–5 plumose setae distally.