Megarcys irregularis ( Banks 1900 )

Stewart, Kenneth W. & Kondratieff, Boris C., 2012, Larvae Of The Nearctic Species Of The Stonefly Genus Megarcys Klapálek (Plecoptera: Perlodidae), Illiesia 8 (3), pp. 16-36 : 20-23

publication ID

https://doi.org/ 10.5281/zenodo.4760667

DOI

https://doi.org/10.5281/zenodo.4762541

persistent identifier

https://treatment.plazi.org/id/C250BC3D-FFBC-FF9C-FC0C-3D40FDE94119

treatment provided by

Felipe

scientific name

Megarcys irregularis ( Banks 1900 )
status

 

Megarcys irregularis ( Banks 1900) View in CoL

( Figs. 12 View Figs , 24 View Figs , 30 View Figs , 36 View Figs , 42 View Figs , 48 View Figs , 60 View Figs , 70 View Figs , 84 View Figs a-b, Table 1 View Table 1 )

Distribution. Pacific Northwest; Coastal and Cascade Mountains of Washington, British Columbia.

Material examined. Washington: Pierce Co., Fryingpan Creek, Sunrise Road , Mount Rainier National Park , 13-VII-2003, B. Kondratieff, J. Schmidt, 1♂, 2♀ larvae; 14-VII-2004, B. Kondratieff, 5♀; Nisqually River , Longmire, Mount Rainier National Park, 28-V-1997, B. Kondratieff, 2♂, 1♀, 2♂ larvae; White River , Hwy. 410, Mount Rainier National Park, B. Kondratieff, 8♂, 1♀, 3♂ larvae, 3♀ larvae, 1♂ exuvium, 2♀ exuviae; 20-VI-2003, B. Kondratieff, R. Zuellig, J. Schmidt, 2♀.

Characters. Head capsule width ♂ 3.06-3.30mm, ♀ 3.90-4.62mm; pronotal width ♂ 2.88-3.12mm, ♀ 3.36- 4.08mm; body length ♂ 18.3-19.5mm, ♀ 19.5-24.0mm ( Table 1 View Table 1 ). Color and pigmentation ( Figs. 12 View Figs , 24 View Figs , 30 View Figs , 36 View Figs , 42 View Figs , 48 View Figs ), lacinia, and dorsomesal band of erect silky white hairs typical of genus. Wingpads of ♂ and ♀ macropterous. Gill number and arrangement typical of genus ( Fig. 70 View Figs ). Submental gill length ♂ 0.12- 0.42mm, ♀ 0.36-0.45mm; anterior supracoxal gill length ♂ 0.27-0.42mm, ♀ 0.36mm ( Table 1 View Table 1 ). Legs ( Fig. 30 View Figs ) with setation typical of genus as described by Stewart & Stark (2002).Y-arms of mesosternum ( Fig. 36 View Figs ) typical of genus. Cercal segments ♂ 24-26 ( Table 1 View Table 1 ), with setation typical of genus. Developing membranous, windsocklike process of male epiproct ( Figs. 42 View Figs , 48 View Figs , 70 View Figs ) evident in late instar individuals, and pointed posteroventrally in lateral view ( Fig. 79 View Figs ).Developing female subgenital plate of 8 th sternum ( Figs. 49 View Figs , 84a, b View Figs ) shallowly notched mesally.

Comments. The generic characters proposed by Stewart & Stark (2002), based solely on M. signata , are reaffirmed in this species, and color and pigmentation fit the generic pattern illustrated herein for M. signata . The measured gill lengths and shapes were greatly variable in this species ( Table 1 View Table 1 ), and otherwise similar to M. signata .

R

Departamento de Geologia, Universidad de Chile

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Perlodidae

Genus

Megarcys

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF