Pictetiella lechleitneri (Plecoptera: Perlodidae), a new species from Mount Rainier National Park, Washington, U.S.A

2004·1.9 MB·

by  Bill P Stark

PROC. ENTOMOL. SOC. WASH.
106(4), 2004. pp. 747-750
PICTETIELLA LECHLEITNERl (PLECOPTERA: PERLODIDAE), A NEW
SPECIES FROM MOUNT RAINIER NATIONAL PARK, WASHINGTON,
U.S.A.
Bill P. Stark and Boris C. Kondratieff
(BPS) Department of Biology, Box 4045, Mississippi College, Clinton, MS 39058,
U.S.A. (e-mail: [email protected]): (BCK) Department of Bioagricultural Sciences and Pest
Management, Colorado State University, Fort Collins, CO 80523, U.S.A. (e-mail:
[email protected])
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Abstract. Pictetiella lechleitneri, new species, is described from a male, female, and
nymphal specimen collected in Mt. Rainier National Park. Washington. U.S.A. The new
species is compared with P. expansa (Banks), the only other Nearctic species oi Pictetiella
lilies.
Key Words: U.S.A.. Washington, Mount Rainier National Park, stonefly. Perlodidae.
Pictetiella
Pictetiella was proposed by lilies (1966) Pictetiella lechleitneri Stark and
as a replacement name for Pictetia (Banks Kondratieff, new species
1947), when the latter was found to be a (Figs. 1-9)
secondary homonym. The genus was —
Types. Holotype 6 (reared) from
thought to be monotypic and endemic to the
Washington, Pierce Co., Carbon River at
U.S. Rocky Mountains until Zwick and
Carbon River entrance. Mount Rainier Na-
Levanidova (in Zwick et al. 1971), and
tional Park. 12 July 2003 (emerged 21
Zhiltzova (in Levanidova and Zhiltzova &
July), B.C. Kondratieff J. Schmidt; same
1976), described the Asian species, P. asia-
data 9 allotype (reared). Deposited in the
1
tica Zwick and Levanidova and P. zM'icki National Museum of Natural History,
Zhiltzova. The Nearctic species, P. expansa Smithsonian Institution, Washington, DC.
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(Banks), remained poorly known until Bau- Additional material. nymph collected
1
mann (1973) redescribed the species and with the holotype and allotype.
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clarified its nomenclature. This species is Adult habitus. Submental gills obscure.
now known from scattered localities in Col- General color dark brown to black pat-
orado, Idaho, Montana. Utah, and Wyo- terned with yellow. Head black over pos-
ming (Baumann et al. 1977), but its full dis- terior region but with trilobed yellow patch
tribution is probably under reported due to covering occiput mesally and extending
its late summer adult emergence. Recently, into ocellar triangle (Fig. 1): black patch
one of us (BCK) and a colleague, Jason P. covering area lateral to mesal yellow to an-
Schmidt, collected nymphs of a second Ne- tennal bases and terminating at anterior
arctic Pictetiella from Mount Rainier Na- ocellus: anterior frons and clypeus yellow.
tional Park, Washington, and reared a single Pronotum with a broad mesal yellow band
male and female described below. and scattered dark rugosities and pale areas
PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
748
Figs. 1-5. Pictetiella lechleitneri. 1, Adult head and pronotum. 2, Male terminalia, dorsal. 3, Epiproct, dorsal.
4, Female subgenital plate. 5, Nymphal head and pronotum.
on disc. Mesosternum with dark brown patches on sterna 5-9; patches on sterna 7-
transverse band covering basisternum and 8 large, covering much of segment; sterna
additional brown pigment lining stem and 5-8 with small mesal lobes, that on seg-
Y-arms and partially filling area between ment 7 largest. Epiproct outline broad near
furcal pits; mesosternal grooves typical of apex and with a small mesoapical nipple-
genus. Wing membrane transparent, veins like process (Figs. 2-3); dorsal and ventral
dark brown but paler in costal region. Fem- surfaces mostly membranous but covered
ora banded; dark brown in a dorsomesal with densely packed, backward directed,
patch which expands on anterior surface to small sharp spines; dorsal sclerite wide at
femoral base; yellow patches occur distally base and tapered to base of apical nipple,
and on dorsobasal surface. Tibiae and tarsi becoming less distinct near apex; ventral
%
dark brown. sclerite extends for of epiproct length,
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Male. Macropterous. Forewing length unarmed. Cowl of epiproct covered with
16 mm. Abdominal sterna dark brown but dense pile of fine setae; paragenital plates
with broad yellow U-shaped, posteromesal sclerotized, lateral stylets absent (Fig. 2).
VOLUME NUMBER
106. 4 749
Figs. 6-9. Pictetiella lechleitneri, SEM micrographs of eggs. 6, Entire egg. 7, Lateral view of lid. 8. Dorsal
view of lid. 9, Chorionic detail with micropyle.
Hemiterga broadly rounded and sparsely brown patterned with yellow. Head mostly
armed with short, triangular sensilla basi- pale on occiput and in a patch forward of
conica. median ocellus (Fig. 5); pronotum mostly
Female (specimen with unexpanded brown with iiTegular pale areas scattered on
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wings). Subgenital plate large and broadly disc. Abdominal terga 2-10 with large
rounded; apex almost as wide as base (Fig. paired pale spots, narrowly separated by
4). Sternum 9 essentially bare in mesal median brown band; posterior fringe in-
field, but with an irregular marginal row of cludes several long setae and mixed short
short bristles. thick ones. Femora banded with narrow
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Egg. Crudely three sided but somewhat brown median band. Mandibles typical of
turtle shaped with collar covered by lid genus, lacinia with a pair of prominent bris-
(Figs. 6-9); chorion smooth on ventral side tles near base of secondary tooth and an
surrounding collar but granular over rest of incomplete row of minor setae on basal
surface (Figs. 6-9). Axillary lateral ridges third of margin.
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and cross poorly defined. Micropyles in ir- Etymology. The patronym honors Dr.
regular equatorial rows; micropylar orifices Richard A. Lechleitner. Mount Rainier Na-
oval and set on smooth linear ridges (Fig. tional Park. Washington. Rich has provided
9). — generous assistance and guidance in the
Nymph (male). Preemergent body study of the aquatic insects gf Mount Rain-
length 17 mm. Submental gills slightly lon- ier National Park, a remarkable pristine
ger than basal diameter. General color landscape.
L
750 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
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Diagnosis. The epiproct of P. lechleit- Other perlodine stoneflies collected and
neri (Figs. 2-3) is shorter and broader near reared with P. lechleitneri included Megar-
the apex than in P. expansa, and the color cys irregularis (Banks) and Kogotus nonus
pattern is more striking with conspicuous (Needham and Claassen), with the former
femoral bands and broad U-shaped poster- being especially abundant.
omesal sternal patches on abdominal seg-
Acknowledgments
ments 5-8. The female subgenital plate
structure (Fig. 4) is very similar to P. ex- We thank Jason P. Schmidt, Colorado
pansa, but the female can probably be sep- State University, for his assistance in the
arated by the banded femoral character. July field collections. Dr. Richard A. Lech-
Eggs are distinctive in collar form. Those leitner facilitated studying the aquatic in-
of P. expansa have the lid expanded into a sects of Mount Rainier National Park, and
hoodlike structure (Baumann 1973, hgs. E- accompanied the junior author on many en-
H), that is much smaller in P. lechletnieri. joyable and productive collecting trips.
In addition, the ventral concavity around
Literature Cited
the collar orifice is completely smooth in
the new species (Fig. 7), but has a cluster Banks, N. 1947. Some characters in the Perhdae. Psy-
of irregular ridges in P. expansa. The che 54: 266-29
nymph differs from P. expansa most con- Baumann, R. W. 1973. Studies on Utah stoneflies (Ple-
coptera). Great Basin Naturalist 33: 91-108.
spicuously by the paired pale tergal patches
Baumann, R. W. and A. R. Gaufin. 1969. The stone-
on abdominal segments 2-10.
— flies ofthe Wasatch Mountains. Proceedings ofthe
Discussion. Kondratieff and Lechleit- Utah Academy of Sciences 46: 106-1 13.
ner (2002) listed 82 species of stoneflies Baumann. R. W., A. R. Gaufin, and R. F. Surdick.
from Mount Rainier National Park, but no 1977. The stoneflies (Plecoptera) of the Rocky
Mountains. Memoirs of the American Entomolog-
specimens of Pictetiella were available for
ical Society, Number 3 1. 208 pp.
study despite relatively intensive collecting Kondratieff, B. C. and R. A. Lechleitner. 2002. Stone-
of adult Plecoptera. Typically, Pictetiella flies (Plecoptera) of Mount Rainier National Park,
emerges late in the season, often as late as Washington. Western North American Naturalist
October (Baumann and Gaufin 1969), and 62: 385-404.
lilies, J. 1966. Katalog der rezenten Plecoptera. Das
adults are difficult to find in the field. Re-
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cent collecting of immature aquatic insects Levanidova, I. M. and L. A. Zhiltzova. 1976. Stone-
in July revealed a striking perlodine nymph flies of the Chukotka Peninsula. Freshwater Fauna
occurring in the Carbon River, a large of the Chukotka Peninsula. Trudy Biologo-pods-
drainage on the west side of the Park. De- vennogo Instituta 368(139): 15-37.
spite much effort only a few nymphs were Zwick, P., I. M. Levanidova. and L. A. Zhiltzova.
1971. On the fauna of Plecoptera from the Soviet
collected and returned to Colorado State Far East. Entomologicheskoe Obozrenie 50: 849-
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