Podmosta obscura (Frison)

Stewart, Kenneth W. & Stark, Bill P., 2011, Further Descriptions Of Western North American Podmosta Larvae And Their Separation From Ostrocerca Larvae (Plecoptera: Nemouridae), Illiesia 7 (10), pp. 104-117 : 110

publication ID

https://doi.org/ 10.5281/zenodo.4760091

DOI

https://doi.org/10.5281/zenodo.4763687

persistent identifier

https://treatment.plazi.org/id/03A687DC-FFD3-FF96-FC74-FCEFE991A686

treatment provided by

Felipe

scientific name

Podmosta obscura (Frison)
status

 

Podmosta obscura (Frison) View in CoL

( Figs. 1 View Fig , 4, 6, 7, 13-16 View Figs , 18 View Figs , 26 View Figs , 31 View Figs , 47, 48 View Figs )

Distribution. Pacific Northwest (Oregon, Washington).

Material Examined. Oregon: Benton Co., Outgate Beck intermittent stream, 60 th Street , outskirts of Corvallis , Feb. 1997 -1999 benthos and emergence trap samples, numerous individuals of all stages, specifically 6♂, 10♀, 8♂ larvae, 3♀ larvae (only adults of this species collected in emergence traps in this stream over several years by N.H. Anderson) .

Characters. Body length ♂ 4.5-5.2 mm, ♀ 5.4-5.6 mm, light brown above with mottled dark head pattern and light mesal stripe on thorax ( Fig. 1 View Fig ). Antennal segments approximately 46, head capsule width ♂ 0.90-0.96 mm, ♀ 0.96-1.02 mm; eyes large, head wider than pronotum ( Fig. 1 View Fig ). Gills absent. Mandibles with 5 or 6 apical teeth; right mandible as described herein for P. weberi , with raised molar pad that grinds against the opposing depressed molar cup of left mandible ( Figs. 21, 22 View Figs ), molar cup with outer (dorsal) comb of curved teeth ( Figs. 20, 22 View Figs ). Laciniae triangular, palmate, with scalloped palm surface, 7-9 fingerlike apical teeth, apicodorsal comb of about 10 long, acute-pointed bristles and apicoventral comb of about 8 short, acute-pointed bristles ( Fig. 26 View Figs ). Pronotum bearing scattered short bristles and sensillae on disc, distinct lateral fringe lacking ( Fig. 31 View Figs ). Wingpads bearing scattered short bristles over surface, and tuft of short bristles on anterolateral corners ( Fig. 1 View Fig ). Femora bearing scattered short bristles and hairs over dorsal surface, longer bristles apicodorsally ( Fig. 1 View Fig ). Tibiae bearing scattered short bristles and few (5-7) posterior silky fringe hairs ( Figs. 1 View Fig , 4 View Figs ). Mesosternal Y-ridge faint, closed by anterior ridge forming a rectangular area as in Stewart & Stark (2002, Fig. 9.16E View Figs ). Abdominal terga bearing scattered microtrichia and macrotrichia scattered on intercalary surface, and forming a posterior fringe. Sexual dimorphism evident; males with developing hypoproct on sternum 9 ( Fig. 14 View Figs ) and in pharate individuals evidence of developing external genitalia ( Fig. 13 View Figs ) and raised tergum 10 ( Fig. 15 View Figs ). Cercal segments 22-24; cercomeres 1-10 bearing apical whorls of stout bristles, fine hairs and sensillae, bristles about 0.65 times length of their segment ( Fig. 47 View Figs ). Middle and anteapical cercomeres bearing whorl bristles 0.35-0.46 times length of their segment, and 3-7 fine intercalary hairs about 0.32 times length of their segment, all as seen laterally ( Fig. 48 View Figs ). Diagnostic characters: cercal setation as described ( Figs. 47, 48 View Figs ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Nemouridae

Genus

Podmosta

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