Isoperla, OF

Sandberg, John B. & Kondratieff, Boris C., 2013, The Isoperla Of California (Plecoptera: Perlodidae); Updated Male Descriptions And Adult Keys For 18 Western Nearctic Species, Illiesia 9 (5), pp. 34-64 : 37-39

publication ID

https://doi.org/10.5281/zenodo.4760870

publication LSID

lsid:zoobank.org:pub:150B2555-91E3-4110-8BBC-25F1AAC0E6B2

DOI

https://doi.org/10.5281/zenodo.4766390

persistent identifier

https://treatment.plazi.org/id/1B32387A-8314-B27D-F676-A7E5FA3FA3DC

treatment provided by

Felipe

scientific name

Isoperla
status

 

Keys to the Isoperla of California (including I. rainiera , I. tilasqua and I. umpqua )

Males

1 Pronotum checkered black on yellow; aedeagus without sclerotized process; paraprocts abruptly tapering to blunt apical tips, usually secondarily barbed ventrally; vesicle a broadly rounded lobe, wider at base then apex ( Figs. 11 View Figs a-d) ..…... I. pinta

1’ Pronotum without checkered pigment pattern, aedeagus, paraprocts and vesicle variable …..... 2

2 Aedeagus without posterior sclerotized process ( Figs. 1 View Figs , 3 View Figs , 9-12 View Figs View Figs , 15 View Figs , 17 View Figs ) ………..……....…………. 3

2’ Aedeagus with variable posterior sclerotized process ( Figs. 2 View Figs , 4-8 View Figs View Figs View Figs , 13-14 View Figs , 16 View Figs , 18 View Figs ) ………...……. 9

3(2) Vesicle absent or weakly produced ( Figs. 9d View Figs , 15d View Figs ).………………...….………….……………… 4

3’ Vesicle present and variably shaped ( Figs. 1d View Figs , 3d View Figs , 10d View Figs , 13d View Figs , 18d View Figs ) …………..……..………………….. 5

4(3) Aedeagal posterior margin with a median patch of spinulae ( Figs. 15 View Figs a-c); apex usually with two small, pointed lobes ( Figs. 15 View Figs a-c) …………………………………………….. I. sobria

4’ Aedeagal posterobasal margin with a median patch of spinulae concentrated into two distinct longitudinal bands ( Figs. 9 View Figs a-b); and a second posteroapical patch of spinulae above posterior lobe ( Figs. 9a, c View Figs ) …………………….….. I. miwok

5(3) Ninth tergum with short stout spinulae (sometimes arranged in a bipartite patch) or ninth and tenth terga with distinct patches of long stout setae near posterior margins ( Figs. 1c View Figs , 10c View Figs , 12c View Figs ) …………………………….…………………....….. 6

5’ Ninth and tenth terga without spinulae, long setae usually scattered ……………...………..….. 8

6(5) Vesicle rounded apically, base broader than apex, occasionally appearing constricted at middle; paraproct length if straightened, subequal to combined length of first two cercal segments, tapering gradually to blunt apices; posterolateral margins of ninth and tenth terga with patches of long stout setae, fewer and smaller on tergum ten ( Figs. 12 View Figs a-d) ……………...…... I. quinquepunctata

6’ Vesicle truncated or rectangular apically; paraproct length and shape variable; ninth and tenth terga with scattered fine setae, ninth tergum with mesal patches of short stout spinulae ( Figs. 1 View Figs , 10 View Figs ) ………………………………………...…...... 7

7(6) Vesicle rectangular, length half as long as wide ( Fig. 1d View Figs ); apical 1/3 of aedeagus tube-like, directed ventrally, covered with minute spinulae and a posterior pair of finer spinule patches divided or joined apically, apex a complex nipplelike tip ( Figs. 1 View Figs a-c); paraproct length if straightened greater than combined length of first and second cercal segments, tapering gradually to sharp apices ( Fig. 1c View Figs ) …………………..… I. acula

7’ Vesicle trapezoid shaped, about as long as wide ( Fig. 10d View Figs ); apical 1/2 of aedeagus tube-like, directed posteriorly, covered with minute spinulae and concentrated somewhat above bilobed tip ( Figs. 10 View Figs a-c); paraproct length if straightened subequal to combined length of first two cercal segments, tapering gradually to blunt apices ( Fig. 10c View Figs ) ..................................... I. mormona

8(5) Abdomen yellow; when everted live and fixed in hot water, aedeagus with one large patch of spinulae concentrated below posterobasal lobe ( Fig. 3b View Figs ), a long thin patch along posteroapical margin ( Fig. 3c View Figs ), apex bulbous, deeply inverted, and without a pair of short apicolateral lobes; when cleared in KOH, apex with a single inverted tube-like process ( Fig. 20a View Figs ), CA-Domingo Spring …………………………...……...…...... I. baumanni

8’ Abdomen dark; when everted live and fixed in hot water, aedeagus with one large patch of spinulae concentrated below posterobasal lobe ( Fig. 17b View Figs ), a long thin patch along posteroapical margin ( Fig. 17c View Figs ), apex bulbous, deeply inverted, and usually with one pair of short sharp apicolateral lobes near apex (similar to I. sobria ); when cleared in KOH, apex with two inverted tube-like processes ( Fig. 20f View Figs ), OR, WA …………………………………………... I. tilasqua

9(2) Vesicle a broadly rounded lobe, wider at base then apex ( Figs. 6d View Figs , 8d View Figs , 14d View Figs , 16d View Figs ) …………...…. 10

9’ Vesicle pedunculate, width subequal to length, constricted near base with curved lateral margins, and apex variable ( Figs. 2d View Figs , 4d View Figs , 5d View Figs , 7d View Figs , 13d View Figs , 18d View Figs ) ……………..………………………………..….… 13

10(9) Aedeagus with at least one patch of stout spinules above sclerotized process ( Figs. 6a View Figs , 8b View Figs , 15a View Figs ); apex of sclerotized process rounded in lateral view ( Figs. 6a View Figs , 8a View Figs , 15a View Figs ), distal margin either thin or expanded in posterior view ( Figs. 6b View Figs , 8b View Figs , 15b View Figs ) ………………………………..………...…..… 11

10’ Aedeagus without a spinule patch above sclerotized process ( Fig. 16a View Figs ); apex of sclerotized process expanded, flattened and projecting dorsally in lateral view ( Fig. 16b View Figs ), bifurcate subapically with two ventrally directed rounded lobes in posterior view ( Fig. 16b View Figs inset), width of lobes 0.18-0.20 mm …………………..... I. sordida

11(10) A single patch above sclerotized process composed of fine pale spinules; apex of sclerotized process rounded in lateral view ( Figs. 8 View Figs a-b), distal margin thin and blade-like in posterior view ( Fig. 8b View Figs ) ….…………. I. marmorata

11’ Spinule patch either single or triple and usually dark ( Figs. 6c View Figs , 14c View Figs ); apex of expanded sclerotized process rounded in lateral view ( Figs. 6a View Figs , 14a View Figs ), distal margin expanded slightly in posterior view ( Figs. 6c View Figs , 14c View Figs ) …………………………………..... 12

12(11) A single spinule patch above sclerotized process ( Figs. 6a & c View Figs ) ..…………………… I. fulva

12’ One bi-hemispherical shaped spinule patch above sclerotized process and a pair of smaller rounded patches laterally ( Figs. 14 View Figs a-c) ……… I. roguensis

13(9) Aedeagal sclerotized process bifurcate in posterior view ( Figs. 4-5 View Figs View Figs ) …………...…………. 14

13’ Aedeagal sclerotized process not bifurcate in posterior view ( Figs. 2 View Figs , 7 View Figs , 13 View Figs , 18 View Figs ) ……………….. 15

14(13) Sclerotized process with long apically pointed bifurcate arms; length of projecting process greater than 0.5 mm ( Fig. 4a View Figs ); abdomen mostly brown ……………………..…………... I. bifurcata

14’ Sclerotized process with short rounded bifurcate lobes; length of projecting process less than 0.5 mm ( Figs. 5 View Figs a-b); width of bifurcate apicolateral lobes 0.09-0.10 mm; abdomen mostly yellow ………………………………………....... I. denningi

15(13) Posterior margin of aedeagus with elliptical shaped patch of long stout spinulae separated from and above sclerotized process; sclerotized process digitate, with nearly parallel dorsal and ventral margins in lateral view, apex narrowly rounded ( Figs. 7 View Figs a-c) ..……………….….. I. laucki

15’ Posterior margin of aedeagus without a patch of long stout spinulae; sclerotized process otherwise ( Figs. 2 View Figs , 13 View Figs , 18 View Figs ) ………….………………...…….... 16

16(15) Sclerotized process crescent shaped in dorsal and ventral views ( Figs. 13 View Figs b-c); paraprocts gradually tapering to sharp apices ( Fig. 13c View Figs ) OR, WA.………………………….………...…. I. rainiera

16’ Sclerotized process clavate; paraprocts tapering gradually to blunt apices; OR, CA ...….……… 17

17(16) Wings hyaline; aedeagus with one distinct lobe ( Fig. 18a View Figs ); sclerotized process length approximately 0.50 mm ( Figs. 18 View Figs a-c); mesoposterior area of 8th and 9th terga with bipartite patches of stout spinulae and long fine scattered setae ( Fig. 18c View Figs ), OR ...………... I. umpqua

17’ Wings tinted; aedeagus with four distinct lobes in lateral view ( Fig. 2b View Figs ); sclerotized process length approximately 0.25 mm ( Fig. 2b View Figs ), spinule patches absent on terga 8-9, CA ….…………….. I. adunca

Females

1 Subgenital plate usually with invagination along apical margin ( Figs. 19 View Figs b-c, 19l-m, 19q-s) .........…. 2

1’ Subgenital plate usually not invaginated ( Figs. 19a, 19 View Figs d-k, 19n-p) ..…………………………….… 9

2(1) Subgenital plate with deep median invagination, the apex 3–4 times wider than depth ( Figs. 19b, 19r View Figs ) ………………………………........ 3

2’ Subgenital plate with shallow median invagination, the apex 8–10 times wider than depth ( Figs. 19c, 19 View Figs l-m, 19q, 19s) ..…………….... 4

3(2) Subgenital plate length less than half the width at base ( Fig. 19b View Figs ) …………...…………..… I. adunca

3’ Subgenital plate length approximately half the width at base ( Fig. 19r View Figs ) ………..…….… I. tilasqua

4(2) Subgenital plate apex truncated, with nearly parallel lateral margins ( Fig. 19c View Figs ); deflected ventrally in lateral view, CA-Domingo Spring ……………………………………...…. I. baumanni

4’ Subgenital plate apex rounded and not deflected ventrally in lateral view ( Figs. 19 View Figs l-m, 19q, 19s) ………………………………………………........... 5

5(4) Subgenital plate width at base approximately half the width of segment 8 and nearly twice that of the subgenital plate length ( Fig. 19m View Figs ) ………………………………...... I. quinquepunctata

5’ Subgenital plate width at base greater than half the width of segment 8 ( Figs. 19l, 19q, 19s View Figs ) …… 6

6(5) Subgenital plate lateral margins broadly rounded ( Fig. 19q View Figs ) ………….…….…… I. sordida

6’ Subgenital plate with short, nearly parallel lateral margins ( Figs. 19l, 19s View Figs ) ………………….…..……. 7

7(6) Pronotum with checkerboard pattern ( Fig. 12d View Figs inset) …………………………...……………. I. pinta

7’ Pronotum without checkerboard pattern …….... 8

8(7) Apical margin of subgenital plate sometimes invaginated (broadly rounded in Fig. 19j View Figs ), apex reaches approximately mid-length of ninth sternum (CA) ………………… I. miwok (in part)

8’ Apical margin of subgenital plate typically invaginated ( Fig. 19s View Figs ), apex not reaching midlength of ninth sternum (OR) ………... I. umpqua

9(1) Subgenital plate with lateral margins nearly parallel ( Figs. 19j, 19p View Figs ) ........................................ 10

9’ Subgenital plate with lateral margins not nearly parallel ( Figs. 19a, 19 View Figs d-i, 19k, 19n-o) ................... 11

10(9) Subgenital plate width nearly as wide as segment 8 ( Fig. 19j View Figs ) …………...…………. I. miwok

10’ Subgenital plate width distinctly less than width of segment 8 ( Fig. 19p View Figs ) ……..……...…… I. sobria

11(9) Subgenital plate triangular ( Figs. 19g, 19o View Figs ) …..………………….. I. fulva , I. roguensis (in part)

11’ Subgenital plate rounded ( Figs. 19a, 19 View Figs d-g, 19h-i, 19k, 19n) ………….…………………..……….…. 12

12(11) Subgenital plate width at base approximately 4-5 times that of the length ( Figs. 19 View Figs d-f, 19i, 19n) ………………………………………….……….... 13

12’ Subgenital plate width at base approximately 2-3 times that of the length ( Figs. 19a, 19h, 19k View Figs ) …………………………………………………...... 16

13(12) Subgenital plate completely suffused with dark pigment ( Fig. 19n View Figs ) ………………. I. rainiera

13’ Subgenital plate partially patterned with pigment or completely light ( Figs. 19 View Figs d-f, 19i) ……….…. 14

14(13) Subgenital plate partially patterned with pigment ( Figs. 19d, 19 View Figs f-g).…. I. bifurcata , I. fulva

14’ Subgenital plate completely light ( Figs. 19e, 19i View Figs ) …………………………………………………...... 15

15(14) Subgenital plate width at base approximately 3-4 times the length ( Fig. 19e View Figs ) ………… I. denningi

15’ Subgenital plate width at base 6-7 times the length ( Fig. 19i View Figs ) …………………….……… I. marmorata

16(12) Subgenital plate width at base approximately 3 times as wide than length; apex slightly truncated or broadly rounded ( Fig. 19k View Figs ) ...…… I. mormona

16’ Subgenital plate width at base approximately twice that of the length ( Figs. 19a, 19h View Figs ) …..…. 17

17(16) Subgenital plate darkly pigmented ( Fig. 19h View Figs ) ……………………………………..……………. I. laucki

17’ Subgenital plate not darkly pigmented ( Fig. 19a View Figs ) ……………………………………………... I. acula

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Perlodidae