Megaleuctra

Baumann, Richard W. & Stark, Bill P., 2013, The Genus Megaleuctra Neave (Plecoptera: Leuctridae) In North America, Illiesia 9 (6), pp. 65-93 : 67-68

publication ID	https://doi.org/ 10.5281/zenodo.4760872
publication LSID	lsid:zoobank.org:pub:6FA6F27D-DBC8-4F39-8063-8BA3C5508155
DOI	https://doi.org/10.5281/zenodo.4765106
persistent identifier	https://treatment.plazi.org/id/03BFB10D-FF8F-FFA2-FF68-1D243021F9D5
treatment provided by	Felipe
scientific name	Megaleuctra
status

Treatment

Key to the Adults of Extant Nearctic Megaleuctra View in CoL

Males

1 Tip of subanal probe acute or threadlike ( Figs. 21- 22 View Figs , 25, 29 View Figs , 75 View Figs , 77, 81); known distribution Appalachian Mountains region of eastern North America.………………………………….…….… 2

1’ Tip of subanal probe enlarged and bearing a subapical notch ( Figs. 3 View Figs , 10 View Figs , 16 View Figs , 36 View Figs , 64, 68); known distribution northern Rocky Mountains, Sierra Nevada and Cascades of western North America ……………………………..……..….... 3

2 Tergum 9 bearing a small, darkly sclerotized, median, toothed process between low lateral lobes ( Figs. 21 View Figs , 28 View Figs ); subanal probe expanded above base and about mid length, tip thread-like ( Figs. 21, 22 View Figs , 25, 29 View Figs ); known from Maryland, Pennsylvania, West Virginia and Shenandoah National Park , Virginia ……………..…… M. flinti View in CoL

2’ Tergum 9 without median process or low lateral lobes ( Figs. 74 View Figs , 78); lateral aspect of subanal probe relatively uniform in diameter throughout, tip truncate ( Fig. 75 View Figs , 81); known from North and South Carolina, Tennessee and the Mount Rogers area of southwestern Virginia ..….. M. williamsae View in CoL

3 Tergum 9 bearing large pair of rounded dorsal processes near posterior margin, anterior margin of process rounded, posterior margin angled abruptly downward, lateral profile forming a broad arc ( Figs. 55 View Figs , 67), cerci short … M. stigmata View in CoL

3’ Tergum 9 bearing smaller pair of processes near posterior margin, processes thinner and pointed at apex, cerci long ( Figs.3 View Figs , 5 View Figs , 36 View Figs , 42) ..................… 4

4 Processes on tergum 9 relatively symmetrical, broad basally, narrowed apically and bluntly pointed or conical at tip ( Figs.6 View Figs , 13 View Figs ), dorsal lobe of subanal probe long, thin and pointed at tip ( Fig. 14 View Figs ), epiproct large, bearing large downward directed hooks medially when partially expanded ( Fig. 9 View Figs ), hooks extending to apex of subanal probe when fully expanded ( Fig. 8 View Figs ), ventral portion forming an elongate triangle when viewed dorsally ( Fig. 6 View Figs ) ……………………… M. complicata View in CoL

4’ Processes on tergum 9 thin, delicate, long and abruptly pointed ( Figs. 36 View Figs , 38), distal portion of subanal probe broad, and diamond shaped, with a small thin tip ( Figs. 46-47 View Figs ), epiproct extending to near tip of unexpanded subanal probe ( Fig. 42 View Figs ), but reaching far short of expanded probe ( Fig. 48 View Figs ), thin tips not very conspicuous when expanded ( Figs. 46, 50 View Figs ), hooks less obvious when extended to apex of subanal probe, ventral portion forming a stout triangle when viewed dorsally ( Fig. 35 View Figs ) ……..……………………….………….… M. kincaidi View in CoL

Females

1 Known distribution Appalachian Mountains region of eastern North America ………….…… 2

1’ Known distribution northern Rocky Mountains, Sierra Nevada and Cascade Mountains of western North America ……………….….……….……… 3

2 Subgenital plate (ovipositor) almost subequal in width from beyond base to apex ( Fig. 83 View Figs ), known distribution North and South Carolina, Tennessee and Mount Rogers area of southwestern Virginia ………..…………………..……….…. M. williamsae View in CoL

2’ Subgenital plate (ovipositor) narrowed conspicuously from base to apex; known from Maryland, Pennsylvania, West Virginia and Shenandoah National Park , Virginia.…… M. flinti View in CoL

3 Stigma beyond cord large, darkly pigmented and filling most of costal space; usually more than 3 branches of radial sector vein ( Fig. 1 View Fig ) .. M. stigmata View in CoL

3’ Stigma beyond cord small, less darkly pigmented and filling less than half of coastal space; usually 2 or 3 branches of radial sector vein ( Fig. 85 View Fig ).……….………..……….... M. complicata View in CoL / M. kincaidi View in CoL