Larvae Of The Nearctic Species Of The Stonefly Genus Megarcys Klapálek (Plecoptera: Perlodidae) Author Stewart, Kenneth W. Department of Biological Sciences, P. O. Box 305220, University of North Texas, Denton, Texas, U. S. A. 76203 E-mail: stewart @ unt. edu stewart@unt.edu Author Kondratieff, Boris C. Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, Colorado, U. S. A. 80523 E-mail: Boris. Kondratieff @ Colostate. edu Boris.Kondratieff@Colostate.edu text Illiesia 2012 8 3 16 36 journal article 6904 10.5281/zenodo.4760667 dd6866c0-c326-4347-8419-b2e688a89062 1854-0392 4760667

Table 1. Individual or range measurements (mm) and cercal segment numbers of pre-emergent Megarcys larvae from different localities.

	Megarcys irregularis			Megarcys signata
	WA1	WA2	WA3	CO4	MT5
♂ wingpads	mac	mac	mac	mac	brac
Head capsule width	3.06-3.12	-	3.80	3.24-3.48	3.24
Pronotal width	3.12	-	2.88	2.76	2.64
Body length	18.3-19.5	-	18.72	16.20-18.48	17.40
SM gill length	0.12-0.45	-	0.30	0.36-0.48	0.36
ASC gill length	0.42	-	0.27-0.30	0.36-042	0.36
No. cercal segments	24-26	-	broken	26	26
♀ wingpads	mac	mac	mac	mac	mac
Head capsule width		4.62	3.90	4.14-4.20	4.20
Pronotal width		4.08	3.36-3.72	3.60-3.72	3.36-3.90
Body length		20.4-24.0	19.5	25.5	-
SM gill length		0.36-0.39	0.39-0.45	0.54-0.60	0.60
ASC gill length		0.36	0.36	0.48-0.60	0.45
	Megarcys subtruncata		Megarcys watertoni Megarcys yosemite
	CA6	OR7	MT8	MT9	CA10
♂ Wingpads	mac	brac	brac	mac	brac
Head capsule width	3.78-3.90	3.12-3.48	2.76-3.00	3.72	2.88-3.36
Pronotal width	3.36-3.48	2.94-3.12	2.58-2.64	3.00	2.76-3.30
Body length	17.94-21.6	15.6-16.0	16.08-17.28	20.4	17.64-20.2
SM gill length	0.39-0.54	0.27-0.30	0.24-0.27	0.54-0.57	0.27-0.36
ASC gill length	0.42-0.54	0.21-0.24	0.24-0.27	0.36	0.18-0.30
No. cercal segments	24-26	broken	26	26	24-26
♀ wingpads	mac	brac	mac	mac	brac
Head capsule width	4.68-4.74	4.20-4.22	3.48- 3.84	4.32-4.38	3.60-3.84
Pronotal width	4.20	4.02-4.26	3.36	3.90	3.54-3.66
Body length	22.2-25.5	19.5-21.2	20.9-22.2	24.30	22.4-22.9
SM gill length	0.54-0.66	0.34-0.36	0.36-0.39	0.66-0.72	0.33-0.45
ASC gill length	0.54-0.60	0.30-0.34	0.33-0.42	0.60-0.66	0.24-0.33