Megaleuctra williamsae Hanson

Baumann, Richard W. & Stark, Bill P., 2013, The Genus Megaleuctra Neave (Plecoptera: Leuctridae) In North America, Illiesia 9 (6), pp. 65-93: 85-89

publication ID

http://doi.org/10.5281/zenodo.4760872

publication LSID

lsid:zoobank.org:pub:6FA6F27D-DBC8-4F39-8063-8BA3C5508155

DOI

http://doi.org/10.5281/zenodo.4765123

persistent identifier

http://treatment.plazi.org/id/03BFB10D-FF99-FFB9-FC60-1E203791FC54

treatment provided by

Felipe

scientific name

Megaleuctra williamsae Hanson
status

 

Megaleuctra williamsae Hanson  

( Figs. 73-84 View Fig View Figs View Figs )

Megaleuctra williamsae Hanson 1941:64   .

Holotype ♂ ( USNM). Type locality: Greenbriar Cove , Great Smoky Mountains , (Sevier Co.) Tennessee, examined   Megaleuctra williamsae: Baumann, 1973:248   . Description of ♀

Material examined. NORTH CAROLINA: Graham Co., Robinsville, 9 June 1976 G.E. Bohart, 1 ♀ ( USUC). GoogleMaps   Haywood Co. , unknown locality, 16 June 1956, H.V. Weems, Jr., 1♂ ( CUIC). GoogleMaps   Tributary, Cove Creek , near Great Smoky Mountains National Park , 19 May 1994, R.W. Baumann, R.F. Kirchner, B.C. Kondratieff, 1♂, 1♀ ( BYUC). GoogleMaps   Jackson Co. , Mull Creek , Nantahala National Forest , 23 May 1993, B.C. Kondratieff, R.F. Kirchner, 1♂, 1♀ ( CSUC). GoogleMaps   Same site, 26 May 1993, B.P. Stark, 1♀ ( BPSC). GoogleMaps   Same site, 19 May 1994, R.W. Baumann, R.F. Kirchner, B.C. Kondratieff, 1♂, 1♀ ( CSUC). GoogleMaps   Macon Co. , Robin Branch, Wayah Bald, 11 March 1990, B.P. Stark, 4 larvae ( BPSC, ROMC). GoogleMaps   Same site, 21 May 1990, B.P. Stark, J. Parham, D. Tanner, 2♂ ( BPSC). GoogleMaps   Same site, 9 June 1998, B.P. Stark, 1♀ ( BPSC). GoogleMaps   Seep, Wayah Creek , Wayah Bald, 35° 09.523’N, 83° 33.916’W, 17 May 2011, B.P. Stark, 1♀ ( BPSC). GoogleMaps   Mitchell Co. , Tributary, Little Rock Creek , Hwy 261, E Roan Mountain , 38.10112N, 82.09245W, 14 May 2010, B.C. Kondratieff, R.E. Zuellig, D.R. Lenat, R.F. Kirchner, 1♂ ( CSUC). GoogleMaps   Swain Co. , Trickle to, Oconaluftee River , 26 April 1976, H.B.N. Hynes, 1 larva ( USNM). GoogleMaps   Yancey Co. , Tributary seep, Cane Creek , Mount Mitchell , 18 May 1994, R.W. Baumann, R.F. Kirchner, B.C. Kondratieff, 1♂ ( BYUC). GoogleMaps   Crabtree Meadows, 11 June, 1967, G.W. Byers, 1♂ ( SEMC); GoogleMaps   Tributary, Rock Creek , Hwy 80. S Hamrick, 35.7527N 82.20085W, 14 May 2010, B.C. Kondratieff, R.E. Zuellig, D.R. Lenat, R.F. Kirchner, 1♂ ( CSUC). GoogleMaps   SOUTH CAROLINA: Oconee Co. , Townes Creek , Bartram Trail, 26-27 May 1980, T.R White, J.S. Weaver, 1♀ ( BPSC). GoogleMaps   Pickens Co. , Sassafras Mountain , 18 May 1937, O.L. Cartwright, 1♀ ( CUCC). GoogleMaps   TENNESSEE: Sevier Co. , Greenbriar Cove, Great Smoky Mountains , 15 May 1938, I. W. Williams, 1♂, Holotype ( USNM). GoogleMaps   10.2 mi. E Gatlinburg, Great Smoky Mountains National Park , 20 May 1970, O.S. Flint, Jr., 1♂, 1♀ ( USNM). GoogleMaps   Le Conte Trail , first stream, Great Smoky Mountains National Park , 25 May 1946, J.F. Hanson, 1♂, 2♀ ( USNM). GoogleMaps   Le Conte Lodge , Mount Le Conte , Great Smoky Mountains National Park , 9 August 1946, P. Hoff, 1♀ ( USNM). GoogleMaps   West Prong Little Pigeon River , Chimney Top Picnic Area , Great Smoky Mountains National Park , 29 April 1977, C.H. & E.S. Nelson, 1♂ ( CHNC). GoogleMaps   Ramsay Prong , Little Pigeon River , Great Smoky Mountains National Park , 20-21 May 1978, C.H. Nelson, 1♀ ( CHNC). GoogleMaps   West Prong Little Pigeon River , Hwy 441, Great Smoky Mountains National Park , 26 May 1984, R.W. Baumann, C.R. Nelson, 1♀ ( BYUC). GoogleMaps   VIRGINIA: Grayson Co. , Headwaters , Lewis Fork, Rt. 603, Lewis Fork Trail , Mount Rogers , 29 May 1982, B.C. Kondratieff, 1♂, 1♀ ( BYUC). GoogleMaps   Same site, 7 May 1983, B.C. Kondratieff, 2♀ ( VPIC). GoogleMaps   Same site, 12 May 1983, B.C. Kondratieff, 1 larva ( CSUC). GoogleMaps   Washington Co., Seeps along Whitetop Road, SW Elk Garden, 36.63939N 81.59625W, 1 June 2006, B.C. Kondratieff, R.F. Kirchner, R.E. Zuellig, 2♂, 4♀ ( CSUC). GoogleMaps  

Male. Macropterous. Length of forewing 14-15 mm; body length 11-13 mm. General color light brown. Wings hyaline, with dark stigma occupying more than half the costal space beyond the cord. Radial sector of forewing with two branches. Tergum 9 without large lobe-like processes ( Figs. 75 View Figs , 78); subgenital plate tongue-like, apex slightly emarginated ( Figs. 75 View Figs , 79); vesicle at base sternum 9 short, and narrow ( Fig. 75 View Figs ). Tergum10 without ventrobasal expansion ( Fig. 79 View Figs ). Epiproct short, forming a right angle at base in lateral aspect ( Figs. 75 View Figs , 78, 80, 82), broad at base, with middorsal groove and upturned hooks at apex ( Figs. 75 View Figs , 82). Subanal probe very long, cylindrical, directed upward and forward, usually fitting in middorsal groove of epiproct ( Figs. 74 View Figs , 77, 82), apex tapered, slightly truncate at tip ( Figs. 75 View Figs , 81, 82); cerci consist of a greatly elongate single segment ( Figs. 75 View Figs , 77, 78).

Female. Macropterous. Length of forewing 12-16 mm; body length 12-15 mm. Coloration similar to male. Head oval and somewhat flattened. Pronotum elongate, anterior corners squared off, posterior angles with large inward directed bevels ( Fig. 73 View Fig ). Radial sector of forewing with two branches. Sternum 8 formed to an ovipositor-like structure, with subgenital plate extending past tip of abdomen ( Figs. 76 View Figs , 83, 84), broadly rounded from beyond the base to almost the apex ( Figs. 76 View Figs , 83, 84); narrowing to short tip ( Fig. 84 View Figs ). Sternum 9 long and very thin ( Fig.84 View Figs ). Cerci inconspicuous ( Figs. 76 View Figs , 83).

Larva. Undescribed.

Egg. Undescribed.

Diagnosis. The male of this species is distinguished from M. flinti   , the only other eastern North American species, by its differently shaped epiproct. In M. williamsae   the epiproct is short and consists of a pair of angled processes, which form a groove that encloses the tip of the subanal probe ( Figs. 74 View Figs , 77, 78. 82), while in M. flinti   it consists of a stout triangular structure that supports the midlength portion of the subanal probe when it is fully extended ( Figs. 22 View Figs , 25, 27 View Figs ) but forms a short wing-like structure when it is located at the base ( Figs. 26, 28, 30 View Figs ). Additionally, the subanal probe of M. williamsae   lacks a median expansion ( Figs. 74, 75 View Figs , 77) whereas in M. flinti   , it is expanded at midlength ( Figs. 22 View Figs , 25-28, 30 View Figs ). The subgenital plate of the female of M. williamsae   is subequal in width from beyond the base to almost to the apex ( Figs. 83-84 View Figs ); whereas in M. flinti   this structure narrows conspicuously from the base to the apex ( Figs. 31, 32 View Figs ). Additionally, the species are allopatric, with M. williamsae   reaching its most northern range extension in southwestern Virginia, and M. flinti   reaching its southernmost range extension in northern Virginia.

CUIC

Cornell University Insect Collection

CSUC

California State University, Chico, Vertebrate Museum

SEMC

University of Kansas - Biodiversity Institute

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Leuctridae

Genus

Megaleuctra

Loc

Megaleuctra williamsae Hanson

Baumann, Richard W. & Stark, Bill P. 2013
2013
Loc

Megaleuctra williamsae: Baumann, 1973:248

Baumann, R. W. 1973: 248
1973
Loc

Megaleuctra williamsae

Hanson, J. F. 1941: 64
1941