Isoperla

Teslenko, Valentina A. & Zhiltzova, Lidiya A., 2006, Nymphs of the genus Isoperla Banks (Plecoptera, Perlodidae) from the Eastern Palaearctic Region, Zootaxa 1130, pp. 1-33 : 30-31

publication ID

https://doi.org/ 10.5281/zenodo.171865

DOI

https://doi.org/10.5281/zenodo.6491147

persistent identifier

https://treatment.plazi.org/id/E13FB458-3659-FFCF-FEFC-FDADFACDCD62

treatment provided by

Plazi

scientific name

Isoperla
status

 

Key to nymphs of the East Palaearctic Isoperla View in CoL species

1. Head with irregular and medially more or less widely interrupted occipital spinule row. Cerci, in apical half with dorsal, or both dorsal and ventral, silky hair fringes ( Figs. 27–28 View FIGURES 23 – 28 ; 13–14). Setal whorls of terminal cercal segments with one dorsal and (or) one ventral setae longer than others ( Figs. 28 View FIGURES 23 – 28 , 48 View FIGURES 43 – 48 , 41 View FIGURES 36 – 41 , 60 View FIGURES 55 – 60 ) .................................... 3

­ Head with complete occipital spinule row. Cerci, without silky hair fringe ( Fig. 7 View FIGURES 2 – 7 , 21 View FIGURES 16 – 21 ). Setal whorls of terminal cercal segments with one ventral seta longer than others ( Figs. 7 View FIGURES 2 – 7 , 21 View FIGURES 16 – 21 ) ................................................................................................................... 2

2. Abdomen with single, wide pale stripe surrounded by brown pigment ( Fig. 1)............. ................................................................................................................ I. altaica View in CoL Sámal

­ Abdomen with alternating light and dark bands ( Fig. 15) ... I. eximia View in CoL Zapekina­Dulkeit

3. Apical half of cerci with fringe of long silky hairs on dorsal side only ( Fig. 41 View FIGURES 36 – 41 ). Lacinia triangular ( Fig. 36 View FIGURES 36 – 41 ) ........................................................................................... 4

­ Apical half of cerci with fringes of long silky hairs on both dorsal and ventral sides ( Figs. 13–14 View FIGURES 9 – 14 ). Lacinia ( Fig. 9 View FIGURES 9 – 14 ) subquadrate ........................................ I. asiatica View in CoL Raušer

4. Apical cercal whorl of terminal segments with one vental setae longer than others (sometimes only twice the others) ( Figs. 40–41 View FIGURES 36 – 41 ; 59–60).............................................. 5

­ Apical cercal whorl of terminal segments with one dorsal and one ventral setae longer than others ( Figs. 47–48 View FIGURES 43 – 48 )............................................................................................... 8

5. Galea tip reaches base of subapical lacinial tooth ( Fig. 55 View FIGURES 55 – 60 ).......................................... 6

­ Galea tip does not reach a base of subapical lacinial tooth ( Fig. 36 View FIGURES 36 – 41 )............................ 7

6. Head ( Fig. 54) pale, U­shaped spot of frontoclypeus open anteriorly; occiput mostly pale. Pronotum ( Fig. 54) with medial, pale, cross­shaped spot. Abdominal terga ( Fig. 54) with medial pale stripe composed of a row heart­shaped spots................................ ....................................................................................................... I. obscura View in CoL Zetterstedt

­ Head ( Fig. 49 View FIGURES 49 – 53 ) with pale spot of frontoclypeus closed anteriorly, or nearly so, by a thin transverse dark stripe; occiput mostly dark. Pronotum ( Fig. 49 View FIGURES 49 – 53 ) without cross­shaped stripe, pattern more complicated. Abdominal terga ( Fig. 49 View FIGURES 49 – 53 ) with paired rounded pale spots surrounding a brown median stripe ................................... I. mongolica View in CoL Zhiltzova

7. Frontoclypeus with U­shaped, dark spot curved anterior to anterior ocellus ( Fig. 35), lateral margins of this spot do not reach antennal bases; occiput with curved transverse darken band between compound eyes narrowed medially ( Figs. 35) ............................. ......................................................................................................... I. lunigera View in CoL Klapálek

­ Head with brown M­band connecting antennal bases and limited to anterior of epicra­

nial suture ( Figs. 29 View FIGURES 29 – 34 ); occiput completely pale ................................... kozlovi View in CoL Zhiltzova 8. Dark M­band limited anteriorly by a well defined pale M­line, large pigmented areas in anterior of frontoclypeus ( Figs. 22; 61) .................................................................... 9

­ Dark M­band limited anteriorly by a well defined pale M­band, large unpigmented areas in anterior of frontoclypeus ( Figs. 42, 68) ......................................................... 10

9. Frontoclypeus ( Fig. 22) darker than general body color, with dark­brown M­band and distinct, pale M­line. Lacinia ( Fig. 23 View FIGURES 23 – 28 ) with small rounded subapical projection. Tip of galea reaches the base of subapical tooth ( Fig. 23 View FIGURES 23 – 28 ) .... I. flavescens View in CoL Zhiltzova & Potikha

­ Frontoclypeus ( Fig. 61) brownish, pigment more diffuse and does not contrast with general body color, M­line pale, indistinct. Lacinia ( Fig. 62 View FIGURES 62 – 67 ) triangular, without subapical projection. Galea small its tip does not reach the base of subapical tooth ( Fig.62 View FIGURES 62 – 67 ). ........................................................................................................... I. ornata View in CoL Zhiltzova

10. Pronotum ( Fig. 42) with pale cross­shaped spot. Frontoclypeus without spots. Abdomen ( Fig. 42) with distinct, dark, median stripe and alternating rows of contrasting dark and pale stripes. Cerci without clothing hairs ( Fig. 46–48 View FIGURES 43 – 48 ) .................................... ....................................................................................................... I. maculata View in CoL Zhiltzova

­ Pale pronotum ( Fig. 68) spot not cross­shaped; anterior of frontoclypeus with two pale spots ( Fig. 68). Medial stripe of abdomen ( Fig. 68) consisting of a wide, pale, mesal longitudinal row of rounded spots, with a faintly darker median line. Cerci ( Figs. 72– 74 View FIGURES 69 – 74 ) covered with thin clothing hairs ........................................ I. pseudornata View in CoL Zhiltzova

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Perlodidae

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