Miroculis ( Ommaethus ) misionensis Domínguez 2007

Miroculis ( Ommaethus) misionensis Domínguez 2007

Figures 8 View FIGURES 7–10 ; 12 View FIGURES 11–12

Miroculis ( Ommaethus) misionensis Domínguez, 2007: 99 (male and female imago).

Diagnosis. The nymph of Miroculis ( O.) misionensis differs from the remaining species of Miroculis by the following combination of characters: 1) labrum with anterolateral margin rounded; 2) maxilla with 53 pectinate setae along subapical margin; 3) posterolateral spines on abdominal segments V–IX, more developed from VII to IX; and 4) gills broad, with the lateral lobes present and trachea unbranched.

Description. Mature nymph (exuviae)—in alcohol.

MEASURES (mm). Body: 5.9. Thorax: fore leg: 3.0; middle leg: 2.8; hind leg: 3.1. RATIOS. Mouthparts: segment III of maxillary palp 0.3× segment II; segment II 1.2× segment I; segment III of labial palp 0.5× segment I; (segment I of labial palp damaged). Legs: width of fore femur 0.4× length; width of hind-femur 0.4× length. Abdomen: width of lamella of gill in its wider part 0.17× length of gill ( Fig. 12 View FIGURES 11–12 ); length of medial filament of gill 0.8× length of gill body. COLORATION. Body. Thorax: pattern of marks as in male imago, with posterior margin of all segments dark, terga II–VII with U-shaped lateral marks on each segment and tergum VII with submedial longitudinal lines. Legs: pattern of marks as in male imago, except for sub-basal band on tibiae; femora with no subapical marks on dorsal and ventral surfaces. Abdomen: pattern of marks as in male imago ( Domínguez, 2007). Gills with inner margin of membrane darker than outer margin. MORPHOLOGY. Head: clypeus anteriorly concave; anterolateral margin of labrum rounded ( Fig. 8 View FIGURES 7–10 ); maxilla with 53 pectinate setae along subapical margin. Abdomen: posterolateral spines present on segments V–IX, more developed on VII–IX. Gills broad, with lateral lobes present and length of inner and outer margin of lamella subequal; with trachea unbranched ( Fig. 12 View FIGURES 11–12 ).

Male imago. Properly described by Domínguez (2007) with the additional information: RATIOS. Forceps with segment III 0.9 × segment II; forceps with segment II 0.4 × segment I; styliger plate with lateral length 0.5 × medial width; penis length 0.8 × length of forceps segment I. MORPHOLOGY. Styliger plate with anterior margin straight; forceps segment II darker than segment I; 1/4 basal of forceps segment I broad narrowing abruptly toward apex.

Material examined. BRAZIL: Santa Catarina: 1 male imago and nymphal exuviae, Erval Velho municipality, 27°19’54.1’’S, 51°19’21.2’’W, 760m, 18.ix.2011, Pes, A.; Boldrini, R.; Cruz, P.; Hamada, N. col, reared GoogleMaps .

Distribution. ARGENTINA: Misiones. BRAZIL: Santa Catarina.

Biological aspects. Originally collected in a protected area (Parque Provincial de Urugua-í, Misiones, Argentina; Domínguez 2007; Manzo et al. 2014), and in low altitudes (from 271 to 410 m.a.s.l.), the nymph collected in Brazil was found in a medium order river surrounded by agricultural areas with relatively higher altitude ( 760 m. a.s.l.). The substrate was rocky and with particulate organic matter. The species, so far, is distributed in the Atlantic Forest biome.