Pteronarcys Newman 1838
Creators: name: Myers, L. W.
name: Kondratieff, B. C.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Pteronarcyidae
Pteronarcys

description: 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 &lt;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&gt; 1, with pointed apices (Figs. 20, 21, 23) …………………………… <i>P. californica</i> 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) ……………………………….….. <i>P. princeps</i> 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&gt; 50° (63.91 ± 13.16) (Figs. 38, 43) ……..…. <i>P. pictetii</i> 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 &lt;39 (33.11 ± 5.16) (Figs. 29, 35) ………………………………….......... <i>P. dorsata</i> 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) ……………………………...…………. <i>P. comstocki</i> 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 &lt;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 &lt;55° (Figs., 15, 17) ……………………….……….......……. <i>P. biloba</i> 7 Measured in dorsal view AB4 POM/SW &lt;0.15; AB6 POM/SW &lt;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) ………………………………….... <i>P. scotti</i> (in part) 7’ Measured in dorsal view AB4 POM/SW ≥ 0.15; AB6 POM/SW&gt; 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) …………………………………………… <i>P. proteus</i> 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) …...............…. <i>P. scotti</i> (in part)
description: Published as part of <i>Myers, L. W. &amp; Kondratieff, B. C., 2017, Larvae Of North American Species Of Pteronarcys (Plecoptera: Pteronarcyidae), pp. 192-224 in Illiesia 13 (16)</i> on pages 201-202, DOI: 10.5281/zenodo.4752933