Trichorhina orensis Souza &amp; Araújo &amp; Campos-Filho 2011, sp. nov.
Creators: name: Souza, L. A.
name: Araújo, J. P.
name: Campos-Filho, I. S.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Platyarthridae
Trichorhina
Trichorhina orensis

description: <i>Trichorhina orensis</i> sp. nov. (Figs 5, 79–94) Type material. Holotype &amp;male;, BRAZIL, <b>Rio de Janeiro</b>: Ilha de Itacuruçá, Praia dos Mocambos (supra tidal line, in garbage), 15.XII.1973, A. L. Castro &amp; B. Prazeres col. (MNRJ 4119). Paratypes: 12&amp;male;, 41&amp;female;, same data as holotype (MNRJ 4120). Diagnosis. Body unpigmented. Eyes with five brown ommatidia. Molar process of mandible with one penicil. Exite of maxillulae with seven teeth, two bifid. Measurements. Male, length: 2.48 mm, width: 0.83 mm; female, length: 2.89 mm, width: 0.99 mm. Description. Body unpigmented. Eyes brown with five ommatidia. Pleon outline continuous with pereon (Fig. 79); telson subtriangular with rounded apex of sides slightly concave. Pereon, pleon and telson covered with fan-shaped scale-setae. In the posterior margins of pereonites they are large and wide, alternating with small and narrow ones, and in the lateral margins they are small. Both median axes of fan-shaped scale-setae evident, as well as the secondary supporting axioles (Fig. 83). <i>Nodulilaterales</i> with simple base (Fig. 84). Pereonite VII with one <i>nodulus lateralis</i> on each side. Position of <i>noduli laterales</i> as illustrated (Fig. 5). Uropods with a tuft of bristles in apex of exopod. Distal joint of antennula with about eight aesthetascs (Fig. 85). Second joint of antennal peduncle without crest in outer border and without dorsal keel. Second joint of antennal flagellum without groove (Fig. 82). Left mandible without rods between molar and incisory processes. Number of penicils in molar process of left mandibles one, right one (Fig. 86). Outer group of exite of maxillulae with three teeth. Inner group of exite of maxillulae with four teeth: two bifid (Fig. 87). Maxilla with inner lobe narrower than outer lobe. Sensilla on the inner lobe, with a sinuous median margin (Fig. 88). Endite of maxilliped with two small teeth in distal outer border, and with inner distal border smooth (Fig. 89). Pleopods without respiratory areas. . . Male. Carpus of pereopod Iof male (Fig. 90) with bristle field. Pereopod VII (Fig. 91) without sexual dimorphism. Pleopod Iwith endopod with distal half turned to the outside and apex slightly crenulate (Fig. 92). Pleopod II (Fig. 93) with triangular exopod; endopod with distal half strongly narrowed. Pleopod V with subtriangular exopod (Fig. 94). Remarks. <i>Trichorhina orensis</i> sp. nov. is distinguished from other species with four to six ommatidia, as follows: from <i>T. acuta</i> by molar process of mandibles with one penicil (six in <i>T. acuta</i>). From <i>T. argentina</i> by 1) body unpigmented (purplish uniform pigmentation in <i>T. argentina</i>); 2) brown ommatidia (black in <i>T. argentina</i>); 3) coxal plates without glandular pores. From <i>T. australiensis</i> by exite of maxillulae with seven teeth, of which two bifid (in <i>T. australiensis</i> nine, five bifid), and endite of maxilliped without tooth in distal inner border. From <i>T. barbouri</i> by second joint of antennal flagellum without groove and tegument smooth. From <i>T. biumbonata</i> sp. nov. by 1) second joint of antennal peduncle without crest in outer border; 2) molar process of mandibles with one penicil (with about seven in <i>T. biumbonata</i>); 3) endite of maxilliped with two teeth in distal outer border (one in <i>T. biumbonata</i>). From <i>T. hospes</i> by exite of maxillulae with seven teeth, of which two bifid (in <i>T. hospes</i> nine, two bifid). From <i>T. lenkoi</i> sp. nov. by endite of maxilliped without teeth in inner distal border, and dactylus of pereopod Iof male with inner seta larger. From <i>T. myrmecophila</i> sp. nov. by theinner group of exiteof maxillulaewith two bifid teeth (four undivided teeth in <i>T. myrmecophila</i>), and endopod of pleopod II of male without row of scale-setae. From <i>T. pallida</i> by the molar process of mandibles with one penicil (two in <i>T. pallida</i>), and endopod of pleopod Iof male with distal half turned to the outside (straight in <i>T. pallida</i>). From <i>T. papillosa</i> by the molar process of mandibles with one penicil (three in <i>T. papillosa</i>), and endite of maxilliped with two teeth in outer distal border. From <i>T. paraensis</i> byexiteof maxillulaewithseven teeth, of which two bifid (in <i>T. paraensis</i> eight, two bifid), and endite of maxilliped without teeth in inner distal border (with one tooth in inner distal border in <i>T. paraensis</i>). From <i>T. silvestrii</i> by distal joint of antennula with about eight aesthetascs (four in <i>T. silvestrii</i>), and molar process of mandibles with one penicil (three in <i>T. silvestrii</i>). From <i>T. vandeli</i> by molar process of mandibles with one penicil (with a group of many penicils in <i>T. vandeli</i>), and exite of maxillulae with seven teeth, of which two bifid (in <i>T. vandeli</i> eight, two bifid). Etymology. From Latin <i>ora</i> = beach, referring to microhabitat where the individuals were collected.
description: Published as part of <i>Souza, L. A., Araújo, J. P. &amp; Campos-Filho, I. S., 2011, The genus Trichorhina Budde-Lund in Brazil, with description of seven new species (Isopoda, Oniscidea, Platyarthridae), pp. 239-261 in Iheringia, Sér. Zool. 101 (32)</i> on pages 249-252, DOI: 10.1590/S0073-47212011000200012, http://zenodo.org/record/3574613