Larvae Of North American Species Of Pteronarcys (Plecoptera: Pteronarcyidae) Author Myers, L. W. Lake Champlain Research Institute, SUNY Plattsburgh, Plattsburgh, NY 12901, U. S. A. E-mail: myerslw @ plattsburgh. edu myerslw@plattsburgh.edu Author Kondratieff, B. C. Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, Colorado, 80523, U. S. A. E-mail: boris. kondratieff @ colostate. edu boris.kondratieff@colostate.edu text Illiesia 2017 13 16 192 224 journal article http://doi.org/10.5281/zenodo.4752933 5cb57102-4f5e-4d1a-90ce-cbe06dc4b57d 1854-0392 4752933 68D355B3-CD8A-4699-AC4E-94527D18FE24 KEY TO MATURE LARVAE 1 Abdominal segments with conspicuous lateral projections ( Figs. 13, 14 , 17 , 25 , 27 , 50, 51, 53 , 54 , 58, 59, 61 , 62 , 66 ) ………………………………… 5 1’ Abdominal segments without lateral projections ( Figs. 18 , 23 , 28 , 36 , 37 , 44 , 45 , 49 ) ……………... 2 2 Supra-antennal plate developed into a semicircular ridge ( Figs. 16 , 30 , 39 , 46 , 48 , 55 , 60 , 63 ); APP weakly developed, APPMH/APPBW <1, and with rounded apices ( Figs. 31 , 36 , 40 , 44 , 47 , 49 ) ………………………………………………… 3 2’ Supra-antennal plate developed into a pointed semi-lunate conical projection visible dorsally ( Figs. 19 , 22 ); APP strongly developed APPMH/APPBW> 1, with pointed apices ( Figs. 20, 21 , 23 ) …………………………… P. californica 3 APP oriented laterally occasionally appearing reflexed distally ( Figs. 31 , 32, 33, 34 , 36 , 40 , 41, 42 , 44 ) ……………………………………………........ 4 3’ APP oriented anterolateral at a 45° angle ( Figs. 47 , 49 ) ……………………………….….. P. princeps 4 Convex bulge on lateral margin of pronotum sometimes present but does not exceed the level of pronotal projections ( Figs. 40 , 41 , 44 ); male larvae with rearward projecting process on abdominal sternum 9 triangular in shape and with sides nearly converging, resulting angle> 50° (63.91 ± 13.16) ( Figs. 38 , 43 ) ……..…. P. pictetii 4’ Convex bulge on lateral margin of pronotum produced often exceeding level of pronotal projections ( Figs. 32 , 36 ); male larvae with rearward projecting process on abdominal sternite 9 rectangular and with nearly parallel sides, resulting angle <39 (33.11 ± 5.16) ( Figs. 29 , 35 ) ………………………………….......... P. dorsata 5 Prominent acute process on each mesothoracic wingpad lateral margin ( Figs. 24 , 27 ); supraantennal plate developed into pointed, semilunate conical projections ( Fig. 26 ); abdominal projections with curved inner margins strongly developed on segments 1-8 ( Figs. 25 , 27 ), pronotal projections well developed with curved margins and sharp apices.; APPMH/APPBW ≥ 1.19 ( Figs. 24 , 27 ) ……………………………...…………. P. comstocki 5’ Prominent acute process absent from each mesothoracic wingpad, lateral margins smooth ( Figs. 15 , 17 , 57 , 66 ); supra-antennal plate developed into a low semi-circular ridge ( Figs. 16 , 55 , 60 , 63 ); APP not strongly developed, apices bluntly rounded; APPMH/APPBW ≤ 1.16 ( Figs. 15 , 17 , 52 , 57 , 65 , 66 ) ………………….…... 6 6 Lateral abdominal projections on AB7 and AB8 reduced and inconspicuous, AB8 POM/SW <0.13; APPA relatively obtuse ≥ 55° and with rounded corners ( Figs. 52 , 57 , 65 , 66 ) …….……. 7 6’ Lateral abdominal projections conspicuous and well developed on AB1-8, AB8 POM/SW ≥ 0.13 ( Figs. 1 , 13, 14 ); APPA more acute <55° (Figs., 15, 17) ……………………….……….......……. P. biloba 7 Measured in dorsal view AB4 POM/SW <0.15; AB6 POM/SW <0.12, lateral abdominal projections of AB5-7 nearly indiscernible, projecting past the posterior margin of the segment minimally in lateral view ( Figs. 58, 61 ) ………………………………….... P. scotti (in part) 7’ Measured in dorsal view AB4 POM/SW ≥ 0.15; AB6 POM/SW> 0.12, lateral abdominal projections of AB5-7 well defined, rugose and triangular shaped in lateral view, the dorsal edge projecting caudally parallel to the lateral surface of the segment ( Figs. 50, 53 ) or lateral abdominal projections of AB5-7 nearly indiscernible, projecting past the posterior margin of the segment minimally in lateral view ( Figs. 58, 61 ) ………………………….……….......................….. 8 8 In dorsal view abdominal projections of AB1-7 well developed with the largest projections possessing a convex outer margin, appearing hook-shaped in dorsal view ( Figs. 51 , 54 , 57 ); AB5-7 well defined, rugose and triangular shaped in lateral view, the dorsal edge projecting caudally parallel to the lateral surface of the segment ( Figs. 50, 53 ), antennae with a distinctive medial yellow band ( Figs. 56 , 57 ) …………………………………………… P. proteus 8’ In dorsal view lateral abdominal projections of AB1-7 less developed, outer margins of largest projections nearly straight ( Figs. 59 , 62 , 66 ), lateral abdominal projections of AB5-7 nearly indiscernible, projecting past the posterior margin of the segment minimally in lateral view ( Figs. 58, 61 ), antennae lacking distinctive yellow band ( Figs. 64 , 66 ) …...............…. P. scotti (in part)