Trichorhina crassisetae, 2011
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publication ID |
https://doi.org/ 10.1590/S0073-47212011000200012 |
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DOI |
https://doi.org/10.5281/zenodo.4386558 |
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persistent identifier |
https://treatment.plazi.org/id/03C987F0-7E77-E444-FF02-D8CFFD0EFEA4 |
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treatment provided by |
Carolina |
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scientific name |
Trichorhina crassisetae |
| status |
sp. nov. |
Trichorhina crassisetae sp. nov
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( Figs 2 View Figs 1–7 ; 25–43 View Figs View Figs )
Type material. Holotype ♂, BRAZIL, Mato Grosso do Sul: Três Lagoas ( Sucuriú river, Corredeira Chupão ), in the forest along the river, in the leaf mold, VI.1964, without collector ( MNRJ 4113 ). Paratypes: 8♂, 8♀, same data as holotype ( MNRJ 4114 ).
Diagnosis. Pigmentation of body dark brown. Eyes with eight black ommatidia. Peduncle of antenna with conspicuous bristles. Exite of maxillulae with four teeth in the outer group, one very small. Pereopod Iof malewith setaebifurcated in carpus. Endopodof pleopod Iof male with row of small setae in inner border. Measurements. Male, length: 3.18 mm, width: 1.19 mm; female, length: 2.52 mm, width: 1.06 mm.
Description. Pigmentation of body dark brown; lighter in head (with small dark brown spots) ( Fig. 25 View Figs ), antennae, sides of pereon and of pleon and uropods. Eyes black with eight ommatidia. Pereonite Iwith anterior margins reaching the eyes. Cephalic lateral lobes small, shorter than median lobe which has rounded apex and straight sides ( Fig. 26 View Figs ). Eyes with eight ommatidia. Pleon outline continuous with pereon; pleonites III–V with well developed epimera. Pereon, pleon and telson covered with fan-shaped scale-setae ( Fig. 27 View Figs ). In the posterior margins of pereonites, scalesetae large and wide intercalate with small and narrow, and in the lateral margins small. Fan-shaped scale-setae more or less rounded and with four shafted frame. Nodulilaterales withfeaturelessbase. Pereonite VII with only one nodulus lateralis on each side. Position of noduli laterales as illustrated ( Fig. 2 View Figs 1–7 ). Distal joint of antennula with five aesthetascs ( Fig. 28 View Figs ). Antenna ( Fig. 29 View Figs ) stretched reaches posterior margin of pereonite II. Second joint of antennal peduncle without dorsal keel nor crest in outer border. Second joint of antennal flagellum without groove. Left mandible ( Fig. 30 View Figs ) without rods between molar and incisory processes. Six penicils in molar process of left mandibles ( Fig. 30 View Figs ), right four ( Fig. 31 View Figs ). Outer group of exite of maxillulae with four teeth, one much smaller. Inner group of exite of maxillulaewith four teeth: two bifid ( Fig. 32 View Figs ). Maxilla with inner lobe narrower than outer lobe. Sensilla on the inner lobe ( Fig. 33 View Figs ). Endite of maxilliped without small teeth in outer distal border, and with inner distal border smooth ( Fig. 34 View Figs ). Pleopods without respiratory areas.
Male. Pereopod I ( Fig. 35 View Figs ) with bifurcate setae in carpus, contrasting to that of female ( Fig. 37 View Figs ); pereopod VII ( Fig. 36 View Figs ) without prominent sexual dimorphism, compared to that of female ( Fig. 38 View Figs ). Pleopod Iwith exopod subrectangular ( Fig. 39 View Figs ); endopod with a row of small setae parallel to the inner border ( Fig. 40 View Figs ). Pleopod II with triangular exopod ( Fig. 41 View Figs ); endopod with distal half slender ( Fig. 42 View Figs ). Pleopod Vwith exopod subrectangular ( Fig. 43 View Figs ).
Remarks. Trichorhina crassisetae sp. nov. is distinguished from species with eight to twelve ommatidia as follows: from T. amazonica Souza-Kury, 1997 by 1) molar process of left mandible with six penicils (four in T. amazonica ); 2) maxillulae with eight teeth, two bifid (in T. amazonica seven, two bifid). From T. atlasi by 1) absence of frontal line (frontal line very thin in T. atlasi ); 2) sexual dimorphism in pereopod I of male: carpus with remarkable bifurcate setae (males without particular features, see VANDEL 1959:101, for T. atlasi ); 3) pleonites three to five with well developed points (blunt in T. atlasi ). From T. kribensis Ferrara & Schmalfuss, 1983 by 1) antenna without aesthetascs; 2) exite of maxillulae with eight teeth, two bifid (nine undivided in T. kribensis ); 3) pereopod VII of male without dimorphism. From T. marianii Arcangeli, 1930 by 1) tegument smooth (granulous in T. marianii ); 2) sexual dimorphism in pereopod Iof male: carpus with bifurcate setae (sexual dimorphism only in length and width of merus and carpus in T. marianii ). From T. pubescens (Dollfus, 1893) by 1) antenna with joints II–V of peduncle without inferior groove; 2) exite of maxillulae with eight teeth, of which two bifid (all teeth undivided in T. pubescens ). Promptly distinguishable from all other species of the genus by eyes with eight ommatidia.
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Etymology. From Latin crassus = thick + seta = bristle, due to the stout bristles in antenna.
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