Macrogynoplax matogrossensis Bispo & Neves 2005

Rippel, Mellis Layra Soares, Novaes, Marcos Carneiro & Krolow, Tiago Kütter, 2019, First records of Kempnyia and Macrogynoplax (Plecoptera: Perlidae) from Tocantins State, Brazil with description of the immatures and the adult female, Zootaxa 4700 (4), pp. 471-478 : 472-473

Macrogynoplax matogrossensis Bispo & Neves 2005

Figs. 1 A–C, 2A–E, 3A

Macrogynoplax matogrossensis Bispo & Neves 2005 in Bispo et al. (2005) : 4 .

Froehlich 2010: 184; Ribeiro & Gorayeb 2016: 434.

Material examined. BRASIL ( BRA) , Tocantins State (TO), municipality of Palmas, Taquaruçú do Porto, Fazenda Encantada , Ribeirão Taquaruçú Grande , (-10.244856, -48.123867), Malaise trap, 1 male, 09–16.xi.2012, Krolow, T. K. & Lima, H. ( CEUFT) ; light trap, 1 male, 26–27.viii.2017, Krolow, T. K. ( CEUFT) ; light pan trap, 2 females, 26.viii.2017, Krolow, T. K. & team ( CEUFT) , 1 male, 28.viii.2017, Krolow, T. K. & team ( CEUFT) ; Malaise G&G, 1 female and 1 male, 26–31.viii.2017, Krolow, T. K. & team ( CEUFT) ; D-net, 1 nymph, 31.vii.2017, Krolow, T. K. & team ( MZUSP) . BRA, TO, municipality of Palmas, Taquaruçú do Porto, Cachoeira do Evilson , Ribeirão Taquaruçú Grande , (-10.23193, -48.123289), D-net, 1 nymph, 30.viii.2017, Boldrini, R ( CLBA) ; light trap, 1 female and 3 males, 18–19.x.2017, Rippel, MLS & Fernandes , AS ( CEUFT) , 1 female, 19–20.x. 20117, Rippel, MLS & Fernandes , AS ( CEUFT) ; light pan trap, 1 male, 19–20.x. 20117, Rippel, MLS & Fernandes , AS ( CEUFT) . BRA, TO, municipality of Palmas, Taquaruçú do Porto, Roncadeira , Ribeirão Taquaruçuzinho , (-10.303639, -8.138861), Dnet, 1 nymph, 28.x.2016, point 07, Andrade, ICP ( CEUFT) , 1 nymph, 28.x.2016, point 07, Andrade, ICP ( MZUSP) ; reared in stream, 1 female and exuvia, 31–01.ix.2017, Krolow, T. K. & team ( CEUFT) ; Pennsylvania trap, 2 females, 17–20.x.2017, Rippel, MLS & Fernandes , AS ( CEUFT) , 1 female, 17–20.x.2017, Rippel, MLS & Fernandes , AS ( CLBA) , 3 females and 2 males, 18–19.x.2017, Rippel, MLS & Fernandes , AS ( CEUFT) , 6 females, 19–20.x.2017, Rippel, MLS & Fernandes , AS ( CEUFT) . BRA, TO, municipality of Palmas, Taquaruçú do Porto, Sambaíba , Córrego Sambaíba , (-10.3780388889, -48.1240111111), Pennsylvania trap, 1 female, 14–15.xi.2017, Krolow, T. K. & team ( CEUFT) , 1 female, 14–15.xi.2017, Krolow, T. K. & team ( INPA) , 2 females, 15–16.xi.2017, Krolow, T. K. & team ( CEUFT) . BRA, TO, municipality of Palmas, Taquaruçú do Porto, Vale do Vai Quem Quer , Ribeirão São João (-10.394327, -48.132334), light trap, 2 females and 2 males, 13–14.xi.2017, Krolow, T. K. & team ( CEUFT) , 3 females and 3 males, 14–15.xi.2017, Krolow, T. K. & team ( CEUFT) , 1 male, 14–15.xi.2017, Krolow, T. K. & team ( CLBA) , 1 male, 14–15.xi.2017, Krolow, T. K. & team ( INPA) ; light pan trap, 2 males, 14–15.xi.2017, Krolow, T. K. & team ( CEUFT) , 1 male, 14–15.xi.2017, Krolow, T. K. & team ( MZUSP) ; Pennsylvania , 1 female, 15–16.xi.2017, Krolow, T. K. & team ( CEUFT) ; Malaise G&G, 1 female, 13–16.xi.2017, Krolow, T. K. & team ( MZUSP) ; D-net, 1 nymph, 29.xi.2018, Krolow, T. K. & team ( CEUFT) , 1 nymph, 29.xi.2018, Krolow, T. K. & team ( INPA) .

Description of nymph. General color dark yellow to ochraceous. Head dark yellow, lighter around eyes and ocelli, below post-frontal line and on frontoclypeal region, two small lighter spots above M-line; compound eyes black; ocelli with a translucent layer; post-frontal line in some specimens exceeding ocelli ( Fig. 1A ). Antennae light yellow. Clypeus dark yellow to yellow. Labrum yellow to light yellow; maxillae light yellow with lacinia yellow and galea light yellow; mandible light yellow to dark brown, with brown band in ventral base margin, 5 pointed teeth on distal margin, mostly decreasing in size toward base, but teeth 2 and 4 similar in size ( Figs. 2A, 2B and 2C ). Pronotum rectangular, with a dark brown band in the margin of pronotum, lateral band wide ( Fig. 1A ). Pronotum, mesonotum, and metanotum with brown areas and yellowish spots forming a characteristic color pattern; presence of small bristles. Thoracic filamentous gills present ( Fig. 1B ): ASC [1], PSC [1, 2, 3], AT [2, 3], PT [3]. Legs light yellow ( Fig. 2D ). Prothoracic leg raptorial. In anterior view, longitudinal row of long and thin pilosity in the extremities of femora and tibia, numerous sparse short spine-like bristles covering all the surface of femora and tibia. In posterior view, these bristles when present restricted only to the margin areas of femora. In anterior and posterior views, presence of spines in the extremities of femora and tibia. Abdomen dark yellow ( Fig. 1C ); spines covering margin of each segment. Anal gills present. Cerci light yellow ( Fig. 2E ), with long bristles and short spine-like setae in each segment.

Measurements. Female forewing length: 13.9– 16.1 mm, n= 27. Male forewing length: 11.9– 14.5 mm, n= 20. Nymphs head width: 2.6– 2.8 mm; head length: 1.6– 1.7 mm; pronotum width: 2.9– 3.1 mm; pronotum length: 1.25– 1.5 mm; wing pads width: 1.7– 2.1 mm; wing pads length: 1.5– 1.8 mm; total body length (without cerci) 9.7– 12.1 mm; n= 6.

Remarks. Adult specimens examined during this study ( Fig. 3A ) agree with the description of Bispo & Neves (2005). However, the forewing length of some males were smaller than previously reported. Additionally, the ventral cavity of the penial armature of M. matogrossensis is wider in our males, narrower in the original description, resembling the penial armature of M. pulchra Ribeiro & Froehlich, 1999 . Despite this difference, we have confidently determined our specimens as M. matogrossensis considering the above variation as intraspecific. Additionally, the nymph resembles M. delicata Ribeiro-Ferreira & Froehlich, 1999 in general color and pronotal shape ( Ferreira-Ribeiro & Gorayeb 2016). However, nymphs of M. delicata have the following configuration of gills: ASC [1, 2, 3], PSC [1, 2, 3], AT [2, 3], a pattern different from the one found in M. matogrossensis .

Nymphs of M. matogrossensis were collected from pristine streams with frequent riffle areas with fast current. In these streams, substrate varied with submerged logs, roots, leaf packs, macrophytes, rocks, and gravel. A portion of the Cachoeira do Evilson (Evilson’s waterfall) is well preserved, despite some spots in pasture. The surrounding streams have been relatively little impacted. The other collecting sites are well-preserved.

Bispo & Neves (2005) described M. matogrossensis from the Municipality of Jaciara, in Mato Grosso State, Brazil. No other records for this species are known. We present first records of the genus and the species for Tocantins State, approximately 1000 km from the type locality of M. matogrossensis . Both sites are characterized by areas being mainly covered by Cerrado.

Figures

FIGURES 1 A–C. Nymph of Macrogynoplax matogrossensis: (A) head and pronotum, (B) thorax in ventral view, (C) abdominal segments and cerci. Scale bars: 1 mm.

FIGURES 2 A–E. Nymph of Macrogynoplax matogrossensis: (A) labium, (B) right mandible, (C) right maxilla, (D) pronotum left leg, dorsal view, (E) cerci in proximal, medial and distal views. Scale bars: 1 mm.

FIGURES 3 A–D. Macrogynoplax matogrossensis: (A) head and pronotum of adult female. Kempnyia goiana: (B) head and pronotum of adult female, (C) subgenital plate, (D) and egg. Scale bars: figures (A–C) 1 mm; figure (D) 0.5 mm.