Trichorhina myrmecophila 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 myrmecophila

description: <i>Trichorhina myrmecophila</i> sp. nov. (Figs 4, 58–78) Type material. Holotype &amp;male;, BRAZIL, <b>São Paulo</b>: Barueri, in nest of <i>Camponotus rufipes</i> (Fabricius, 1775) (Hymenoptera, Formicidae), 14.X.1967, K. Lenko col. (MNRJ 4117). Paratypes: 3&amp;male;, 18&amp;female;, same data as holotype (MNRJ 4118). Diagnosis. Pigmentation of body pale yellow. Eyes with five black ommatidia. Pleopod Iof male with exopod slightly rounded; endopod with apex with row of micro-setae. Measurements. Male, length: 3.00 mm, width: 1.00 mm; female, length: 2.30 mm, width: 0.92 mm. Description. Pigmentation of body faint, pale yellow, with small brown spots in head. Eyes black with five ommatidia. Head partly sunken in pereonite I, anterior margins of pereonite Ireaching the eyes. Cephalic lateral lobes slightly ahead of median lobe which has apex rounded and straight sides (Figs 59, 60). Pleon slightly narrower than pereon, pleonites III–V with well developed points (Fig. 58). Body surface with hexagonal plates. Pereon, pleon and telson covered with fan-shaped scale-setae bearing two axial rods (Fig. 63). <i>Nodulilaterales</i> withfeaturelessbase (Fig. 62). Pereonite VII with only one <i>nodulus lateralis</i> on each side. Position of <i>noduli laterales</i> as illustrated (Fig. 4). Antennula with middle joint much smaller than others, distal joint with five aesthetascs (Fig. 61). Antenna (Fig. 64) stretched reaches posterior margin of pereonite II. Second joint of antennal peduncle without crest in outer border and without dorsal keel. Second joint of antennal flagellum with a slightly transversal groove. Left mandible (Fig. 65) without rods between molar and incisory processes. Number of penicils in molar process of left mandibles one (Fig. 65), right one (Fig. 66). Outer group of exite of maxillulae with three teeth. Inner group of exite of maxillulae with four simple teeth (Fig. 67). Maxilla with inner lobe narrower than outer lobe wich is apically truncate. Sensilla on the inner lobe (Fig. 68). Endite of maxilliped with two small teeth in outer distal border, and irregular inner distal border (Fig. 69). Pleopods without respiratory areas. Male. Pereopods I (Fig. 70) and VII (Fig. 71) without apparent sexual dimorphism (see pereopods I and VII of female in figures 73 and 72, respectively). Carpus of pereopod Iof male without bristle field. Pleopod Iwith exopod rounded (Fig. 74); endopod (Fig. 75) with distal half slightly turned to the outside and apex armed with a short row of micro-setae parallel to the inner border. Pleopod II with triangular exopod (Fig. 77); endopod with distal half gradually tapered (Fig. 76). Pleopod V with sub-rectangular exopod (Fig. 78). Remarks. <i>Trichorhina myrmecophila</i> sp. nov. is distinguished fromother species with eye with four to six ommatidia as follows: from <i>T. acuta</i> by 1) molar process of mandibles with one penicil (six in <i>T. acuta</i>); 2) exite of maxillulae with seven undivided teeth (two of inner group bifid in <i>T. acuta</i>). From <i>T. argentina</i> by 1) exopod of pleopod Iof male rounded (ovoid in <i>T. argentina</i>); 2) endopods of uropods relatively longer. From <i>T. australiensis</i> by 1) antennula with joints of different proportions; 2) exite of maxillulae with seven undivided teeth (in <i>T. australiensis</i> nine, five of which bifid); 3) exopod of pleopod Iof male rounded (narrowed in inner side in <i>T. australiensis</i>). From <i>T. barbouri</i> by 1) 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 upper outer margin (one in <i>T. biumbonata</i>); 4) pereopod Iof male with setae undivided (with up to four points in <i>T. biumbonata</i>). From <i>T. hospes</i> by 1) antennula with distal joint with five aesthetascs (six in <i>T. hospes</i>); 2) exiteof maxillulaewithsevenundividedteeth (in <i>T. hospes</i> nine, two bifid). From <i>T. lenkoi</i> sp. nov. by 1) pigmentation of body pale yellow (light brown in <i>T. lenkoi</i>); 2) eyes black (light brown in <i>T. lenkoi</i>); 3) pleon slightly narrower than pleon (continuous with pereon in <i>T. lenkoi</i>); 4) endopod of pleopod Iof male with row of micro-setae in apex. From <i>T. pallida</i> by 1) molar process of mandibles with one penicil (two in <i>T. pallida</i>); 2) exite of maxillulae with seven undivided teeth (in <i>T. pallida</i> seven, two bifid); 3) exopod of pleopod Iof male rounded (elliptic in <i>T. pallida</i>). From <i>T. papillosa</i> by 1) molar process of mandibles with one penicil (three in <i>T. papillosa</i>); 2) exite of maxillulae with seven undivided teeth (in <i>T. papillosa</i> seven, two bifid); 3) endite of maxilliped with two teeth in distal outer border. From <i>T. paraensis</i> by 1) pereon, pleon and telson with fan-shaped scale-setae (with ovoid scale-setae in <i>T. paraensis</i>); 2) endite of maxilliped with two teeth in outer distal border (with one tooth in <i>T. paraensis</i>). From <i>T. silvestrii</i> by 1) distal joint of antennula with five aesthetascs (four in <i>T. silvestrii</i>); 2) exite of maxillulae with seven undivided teeth (in <i>T. silvestrii</i> eight, two bifid). From <i>T. vandeli</i> by 1) distal joint of antennula with five aesthetascs (seven to eight in <i>T. vandeli</i>); 2) molar process of mandibles with one penicil (with a group of many penicils in <i>T. vandeli</i>). Etymology. Species name stems from Greek and refers to the collecting of the type series in nest of ants.
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 247-249, DOI: 10.1590/S0073-47212011000200012, http://zenodo.org/record/3574613