Pteronarcys, Newman, 1838

Myers, L. W. & Kondratieff, B. C., 2017, Larvae Of North American Species Of Pteronarcys (Plecoptera: Pteronarcyidae), Illiesia 13 (16), pp. 192-224 : 201-202

publication ID

https://doi.org/10.5281/zenodo.4752933

publication LSID

lsid:zoobank.org:pub:68D355B3-CD8A-4699-AC4E-94527D18FE24

DOI

https://doi.org/10.5281/zenodo.4762128

persistent identifier

https://treatment.plazi.org/id/03C087BC-815E-FFD1-FD83-FB19DEE81BFE

treatment provided by

Felipe

scientific name

Pteronarcys
status

 

KEY TO MATURE LARVAE

1 Abdominal segments with conspicuous lateral projections ( Figs. 13, 14 View Fig , 17 View Fig , 25 View Fig , 27 View Fig , 50, 51, 53 View Fig , 54 View Fig , 58, 59, 61 View Fig , 62 View Fig , 66 View Fig ) ………………………………… 5

1’ Abdominal segments without lateral projections ( Figs. 18 View Fig , 23 View Fig , 28 View Fig , 36 View Fig , 37 View Fig , 44 View Fig , 45 View Fig , 49 View Fig ) ……………... 2

2 Supra-antennal plate developed into a semicircular ridge ( Figs. 16 View Fig , 30 View Fig , 39 View Fig , 46 View Fig , 48 View Fig , 55 View Fig , 60 View Fig , 63 View Fig ); APP weakly developed, APPMH/APPBW <1, and with rounded apices ( Figs. 31 View Fig , 36 View Fig , 40 View Fig , 44 View Fig , 47 View Fig , 49 View Fig ) ………………………………………………… 3

2’ Supra-antennal plate developed into a pointed semi-lunate conical projection visible dorsally ( Figs. 19 View Fig , 22 View Fig ); APP strongly developed APPMH/APPBW> 1, with pointed apices ( Figs. 20, 21 View Fig , 23 View Fig ) …………………………… P. californica

3 APP oriented laterally occasionally appearing reflexed distally ( Figs. 31 View Fig , 32, 33, 34 View Fig 32-34 , 36 View Fig , 40 View Fig , 41, 42 View Fig , 44 View Fig ) ……………………………………………........ 4

3’ APP oriented anterolateral at a 45° angle ( Figs. 47 View Fig , 49 View Fig ) ……………………………….….. P. princeps

4 Convex bulge on lateral margin of pronotum sometimes present but does not exceed the level of pronotal projections ( Figs. 40 View Fig , 41 View Fig , 44 View Fig ); 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 View Fig , 43 View Fig ) ……..…. P. pictetii

4’ Convex bulge on lateral margin of pronotum produced often exceeding level of pronotal projections ( Figs. 32 View Fig 32-34 , 36 View Fig ); 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 View Fig , 35 View Fig ) ………………………………….......... P. dorsata

5 Prominent acute process on each mesothoracic wingpad lateral margin ( Figs. 24 View Fig , 27 View Fig ); supraantennal plate developed into pointed, semilunate conical projections ( Fig. 26 View Fig ); abdominal projections with curved inner margins strongly developed on segments 1-8 ( Figs. 25 View Fig , 27 View Fig ), pronotal projections well developed with curved margins and sharp apices.; APPMH/APPBW ≥ 1.19 ( Figs. 24 View Fig , 27 View Fig ) ……………………………...…………. P. comstocki

5’ Prominent acute process absent from each mesothoracic wingpad, lateral margins smooth ( Figs. 15 View Fig , 17 View Fig , 57 View Fig , 66 View Fig ); supra-antennal plate developed into a low semi-circular ridge ( Figs. 16 View Fig , 55 View Fig , 60 View Fig , 63 View Fig ); APP not strongly developed, apices bluntly rounded; APPMH/APPBW ≤ 1.16 ( Figs. 15 View Fig , 17 View Fig , 52 View Fig , 57 View Fig , 65 View Fig , 66 View Fig ) ………………….…... 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 View Fig , 57 View Fig , 65 View Fig , 66 View Fig ) …….……. 7

6’ Lateral abdominal projections conspicuous and well developed on AB1-8, AB8 POM/SW ≥ 0.13 ( Figs. 1 View Fig , 13, 14 View Fig ); 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 View Fig ) ………………………………….... 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 View Fig ) or lateral abdominal projections of AB5-7 nearly indiscernible, projecting past the posterior margin of the segment minimally in lateral view ( Figs. 58, 61 View Fig ) ………………………….……….......................….. 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 View Fig , 54 View Fig , 57 View Fig ); 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 View Fig ), antennae with a distinctive medial yellow band ( Figs. 56 View Fig , 57 View Fig ) …………………………………………… P. proteus

8’ In dorsal view lateral abdominal projections of AB1-7 less developed, outer margins of largest projections nearly straight ( Figs. 59 View Fig , 62 View Fig , 66 View Fig ), lateral abdominal projections of AB5-7 nearly indiscernible, projecting past the posterior margin of the segment minimally in lateral view ( Figs. 58, 61 View Fig ), antennae lacking distinctive yellow band ( Figs. 64 View Fig , 66 View Fig ) …...............…. P. scotti (in part)