Sweltsa Yurok (Plecoptera: Chloroperlidae), A New Stonefly From California, U. S. A.
Author
Stark, Bill P.
and Richard W. Baumann & Box 4045, Department of Biology, Mississippi College, Clinton, Mississippi, U. S. A. 39058 E-mail: stark @ mc. edu
stark@mc.edu
Author
Baumann, Richard W.
Department of Integrative Biology, Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT 84602 E-mail: richard _ baumann @ byu. edu
richard_baumann@byu.edu
text
Illiesia
2007
2007-08-20
3
10
95
101
journal article
http://doi.org/10.5281/zenodo.4758605
74d05919-70e4-4a9f-b08b-24752e372338
1854-0392
4758605
Sweltsa yurok
,
sp. n.
(
Figs. 13-22
)
Material examined.
Holotype
♂
and
♀
paratype
from
California
,
Humboldt Co.
,
2.3 miles
E Berry Summit
,
Hwy
299,
20 May 2001
,
B. Stark
,
K.W. Stewart
, deposited in the United States National Museum (
USNM
).
Additional paratypes: California:
Humboldt Co.
,
Captain Creek
,
Chezam Rd
,
13 May 2006
,
J.J. Lee
,
8 ♂
,
1 ♀
(
BYU
).
Humboldt Co.
, unnamed stream,
Redwood Creek
Trailhead
, near
Orick
,
Redwood National Park
,
1 June 1991
,
R.W. Baumann
,
B.P. Stark
,
2 ♂
,
4 ♀
(
BYU
).
Same
site,
20 May 2006
,
J.J. Lee
,
2 ♂
(
BYU
).
Humboldt Co.
,
Willow Creek
,
Hwy
299,
2.7 miles
E Berry Summit
,
19 May 1998
,
B.P. Stark
,
C.R. Nelson
,
S.W. Szczytko
,
I. Sivec
,
2 ♂
,
2 ♀
(
BPS
,
BYU
).
Humboldt Co.
, tributary seeps
Willow Creek
,
Hwy
299,
2.4 miles
E Berry Summit
,
19 May 1998
,
B.P. Stark
,
C.R. Nelson
,
S.W. Szczytko
,
I. Sivec
,
50 ♂
,
29 ♀
(
BPS
,
BYU
,
SWS
).
Humboldt Co.
, tributary seeps
Willow Creek
,
Hwy
299,
2.5 miles
E Berry Summit
,
19 May 1998
,
B.P. Stark
,
C.R. Nelson
,
S.W. Szczytko
,
I. Sivec
,
2 ♂
,
5 ♀
(
BYU
,
SWS
).
Humboldt Co.
,
Spring
stream,
Hwy
299, mile 31.33,
upper Willow Creek
drainage,
13 May 2006
,
J.J. Lee
,
14 ♂
,
7 ♀
(
BYU
).
Same
site,
19 May 2006
,
J.J. Lee
,
13 ♂
,
5 ♀
(
BYU
).
Same
site,
3 July 2007
,
J.J. Lee
,
6 ♂
,
4 ♀
(
BYU
).
Humboldt Co.
,
Slide Creek
, near
Fish Lake
,
Rd
13
N01,
23
June 2005,
J.J. Lee
,
3 ♂
,
5 ♀
(
BYU
).
Humboldt Co.
, unnamed creek, mile 4.1 near
Fish Lake
,
Rd
13
N01,
20
April 2006,
J.J. Lee
,
8 ♂
,
4 ♀
(
BYU
).
Humboldt Co.
, seep near
Fish Lake
,
Rd
13N01,
0.25 miles
from
Hwy
96,
20 April 2006
,
J.J. Lee
,
1 ♂
(
BYU
).
Humboldt Co.
,
Mason Gulch Creek
,
Hwy
299, mile 29.68, near junction
Willow Creek
,
3 July 2007
,
J.J. Lee
,
21 ♀
(
BYU
).
Lake Co.
,
East Fork Middle Creek
,
0.5 mile
above Middle Creek Campground
,
23 April 1987
,
R.W. Baumann
,
B.P. Stark
,
C.R. Nelson
,
S.A. Wells
,
3 ♂
,
1 ♀
(
BYU
).
Adult habitus.
General color pale yellow brown with dusky brown markings on head and pronotum (
Fig. 13
). Head and pronotal disk setae with brown freckle spots around base. Legs pale, wings transparent with pale brown veins; M and CuA veins darker. Dark brown median abdominal stripe extends through tergum 7 on female and to anterior margin of tergum
8 in
male.
13
16
Figs. 13-16.
Sweltsa yurok
.
13. Head and pronotum, 14. Male terminalia, dorsal, 15. Male terminalia, lateral, 16. Female terminalia, ventral.
Figs. 17-22.
Sweltsa yurok
(17, 22: tributary Willow Creek, 2.4 miles E Berry Summit, Humboldt Co., CA; 18-20: Mile 4.1, Rd 13N01, Humboldt Co., CA; 21: Slide Creek, Humboldt Co., CA). 17. Dorsal aspect male epiproct, 18. Lateral aspect epiproct, 19. Epiproct apex, lateral aspect, 20. Epiproct base, dorsal aspect, 21. Female terminalia, ventral, 22. Egg.
Male.
Forewing length 8.0-9.0 mm. Bare epiproct tip rounded or triangular in dorsal aspect, wide basally and narrowed apically (
Figs. 14
,
17-18
); lateral margins slightly curved beyond midlength in some specimens; dorsal and much of lateral surfaces clothed with dense pile of golden brown setae except for tip (
Figs. 17-19
); apex of epiproct foot shaped in lateral aspect and upturned near tip, but without setae on “heel” and on ventrolateral surface (
Fig. 19
); ventral margin strongly narrowed and blade like; epiproct base wider with bare shoulders (
Figs. 17, 20
); stalk of epiproct densely hairy. Tergum 9 with a median, bare knob near anterior margin (
Fig. 15
). Aedeagus membranous but with a pair of small, ventroapical lobes bearing a few setae.
Female.
Forewing length 9.0-10.0 mm. Subgenital plate outline triangular, apex entire or with a shallow apical notch (
Figs. 16
,
21
). Plate extends over basal third of sternum 9.
Egg.
Length about
0.31 mm
, width about
0.25 mm
. Outline oval, collar absent, but a bare low knob is present in the collar region. Chorion coarsely punctate throughout; pit size variable but largest pits about
4-5 µm
in diameter (
Fig. 22
). Micropylar orifices small and strongly slanted.
Larva.
Unknown.
Etymology.
The species name, used as a noun in apposition, honors the Yurok people of
California
.
Diagnosis.
The new species is most similar to
S. tamalpa
but males of these species are distinguished on the basis of epiproct shape and setation. In
S. tamalpa
the epiproct base is usually completely bare, and the epiproct tip is not bent dorsad at the “ankle” region, whereas in
S. yurok
the epiproct base has a setose band extending between the bare lateral shoulders to the base, and in lateral aspect the epiproct apex is distinctly foot shaped with tip upturned at the “ankle”. The third member of the group,
S. pisteri
,
differs from both species in lacking the foot shaped apical region of the epiproct, and in having more-or-less parallel margins for most of the dorsal length of the epiproct. Females of these species may be inseparable based on subgenital plate morphology, however the eggs of
S. pisteri
(
Fig. 6
) have much more prominent and numerous chorionic punctations than do those of
S. yurok
(
Fig. 22
) and
S. tamalpa
(
Fig. 12
), and the latter species has a more conspicuous non-punctate apical area than
S. yurok
.
The following key is offered to assist in identification of males of this group.