Description of the Limnephilus granti (Nimmo) female with a redescription of the male (Trichoptera: Limnephilidae)

2007·1.9 MB·

by  David E Ruiter

PROC. ENTOMOL. SOC. WASH.
109(1), 2007, pp. 86-89
DESCRIPTION OF THE LIMNEPHILUS GRANTI (NIMMO) FEMALE WITH
A REDESCRIPTION OF THE MALE (TRICHOPTERA: LIMNEPHILIDAE)
David E. Ruiter
6260 South Grant Street, Centennial, CO 80121, U.S.A. (e-mail: druiter@
msn.com)
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Abstract. Description ofthe female and redescription ofthe male o^Limnephilus
granti (Nimmo 1991) are provided. Additional Arizona collection localities are
presented.
Key Words: Trichoptera, Limnephilidae, Lunnephilus granti, Arizona, caddisfly
Limnephihis granti (Nimmo 1991) was or L. hamifer. Therefore, L. granti
described from a single male (AZ: Gra- should still be considered incertae sedis.
ham County, Grant Creek, Hospital Flat Limnephilusgranti is apparently extreme-
Campground, Graham Mountains). ly rare and all specimens have been
Nimmo (1991) indicated similarity with collected from springs and their immedi-
Schmid's (1955) L. assimilis group, in ate outlets in the ponderosa pine region
particular L. parvuhis (Banks) while of eastern Arizona. Additional efforts to
Ruiter (1995) indicated a questionable preserve these rare habitat types and
affinity with L. roJnveri (Banks). Discov- survey their aquatic communities should
ery ofthe female does not support either continue. The following description is
conclusion although the reduced spur based on one male and three females.
count is found in some members of
Schmid's L. assimilis group. The L. Limnephilus granti (Nimmo 1991)
granti spur count is reduced from 1-3-4 (Figs. 1-7)
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in both sexes. The female can be Adult. Head yellow orange with
distinguished from other Limnephilus by dark brown blotches surrounding ocelli
the combination of low spur count; and anterior warts; antenna about 0.7
completely sclerotized subgenital plate; length of forewing, between 60 and 70
9th segment with distinct tergite and segments, scape about 4 times length of
distinct ventromesal separation; and 2"d segment, 3rd segment about twice
tubular lOt^ segment. The reduced spur length of2nd segment, 4th segment about
count of L. granti leads to couplet 10 {L. 1.5 length of 2nd segment, remaining
solidus (Hagen) and L. hamifer Flint) in segments subequal to mid-antenna then
Ruiter (1995). The laterally and ventrally gradually decreasing in length to apex; 3
divided 9th segment also support this ocelli, lateral ocelli subequal to pre-ocelli
association. However, numerous charac- wart; lateral ocelli located one ocelli
teristics ofthe female 9th tergite and 10th width closer to eye than medial suture,
segment, and the male 9th tergal strap located mid-length of head; eye large,
and aedeagal parameres, do not support width equal to distance between medial
a close relationship with either L. solidus suture and eye; medial suture complete;
VOLUME NUMBER
109, 1 87
Figs. 1-7. Limnephilus granti. 1, Male genitalia, lateral aspect. 2, Male aedeagus, lateral aspect. 3,
Mjvaialiee gg^geenniiitaalniaa,, daoorrssaali aassppeecctt.. 4'*,, Mivaialiee ggeenniitiaalniaa,, ppoosstteerriioorr aassppeecctt., 5j, Female genitalia, lateral aspect. 6,
Female genitalia, dorsal aspect. 7, Female genitalia, ventral aspect.
PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
posterior warts oval, width about 2 times apical cells; larger hyaline stripes in
length, with about 12 macrosetae; head thyridial cell and at base of cell V; setae
surface with numerous small, hairlike on veins slightly upright, not particularly
setae between and slightly behind lateral strong; setae on wing membrane recum-
ocelli, most setae with small, pale, single, bent, fine, hairlike, same color as un-
basal warts, single pair of large macro- derlying membrane, i.e., white on white,
setae located between and slightly behind orange on orange. Hind wing pale
lateral ocelli; facial warts consisting of 2 yellow, darker along costal area; setae
subequal, lateral pairs; mesal wart not on veins pale, upright, fine, sparse; setae
obvious, mesal area covered with macro- on membrane pale, recumbent, fine,
setae; postocular wart relatively narrow, sparse at base, denser towards apex.
linear, as long as eye height; maxillary Venation similar in both sexes; distal
palpus three-segmented in male and margins smoothly rounded. Forewing
five-segmented in female, male propor- with R1-R2 separate throughout length,
tions = 0.4:1:1, female proportions = narrowed and slightly curved at ptero-
0.3:1:1:0.6:0.8; labial palpus 3-segmented stigma; apical forks I, II, III, and V, all
in both sexes, proportions = 0.5:0.7:1, cells sessile; anastomosis staggered, R3-
basal 2 segments flattened tear-shaped, discoidal cell common boundary slightly
oval, flattened mesally; labrum 2 times as longer than tl, less than discoidal cell
long as widest portion, widest portion at height; discoidal cell about 1.5 length of
basal swelling; anterior genal projection RS; tl linear, about twice length t2; tl
present; temporal suture inconspicuous. and t2 not parallel; t3 long, originating
Pronotum yellow orange, with single pair on Cul, nearly perpendicular to thyridial
dorsomesal warts, separated mesally; cell, curved posteriorly; three anal cells,
lateral pronotal area with several in- cells Al andA3 small, A2 about 0.5
dividual macrosetae. Mesonotum yellow length of A1+2+3. Hindwing with en-
orange, with pair of linear setal areas, larged anal area; distal margin at Cu not
each comprised of 4-6 macrosetae, dis- strongly incised; hooked setae along
tinct warts absent; scutellar setal area anterior margin absent; R1~R2 separate
dark brown with 3^ isolated macrosetae throughout length, touching near base,
arranged linearly on each side. separating towards apex, curved at pter-
Legs yellow orange, darkening towards ostigma; apical forks I, II, III, and V
tarsi, spines black, tibial spurs orange. present, all cells sessile; anastomosis
Male forefemur with basal black spicules staggered; R3-discoidal cell common
reaching mid length of femur. Tibia and boundary equal or shorter than tl, less
first four tarsal segments with numerous than discoidal cell height; discoidal cell
black spines. Apical tarsal segments with about twice RS; tl linear, about equal
single pair of dark spines on ventral in length to t2; tl and t2 not parallel;
surface. Male and female foretarsal pro- t3 long, originating on Cul, strongly
portions = 1:0.6:0.4:0.3:0.3. Tibial spurs oblique to wing length; posterior 3 anal
variable in female; 1-2-2 in male, 1-2-2 cells with long, hairlike setae.
or 1-2-4 in female; evidence ofa 1-2-3 and Abdomen orange, becoming brown
1-3-4 spur count usually present with dorsally; setae fine, inconspicuous except
reduced basal pits at point of typical stronger on male 8th; 5th segment gland,
spur attachment. kidney shaped, large, surface of 5th
Wing length 13-14 mm. Forewing five tergite finely reticulate over entire sur-
times as long as widest portion; brightly face; ventral spurs absent.
contrasted coloration, base color pale Male genitalia (Figs. 1—4).- Tergite 8
orange; hyaline speckling in radial and with small posteromesal spinate patch,
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109, 1
Spines appressed. Segment 9 with very of spermatheca with minute spicules,
narrow, tall tergite. Superior appendages without obvious addi—tion markings.
roughly quadrate laterally; thick and Material examined. ^ARIZONA: Apa-
widely separated mesally. Intermediate che County, Government Spring, about
appendages longer than superior appen- 2 miles south of Greer, along West Fork
dages, narrowed apically to slightly Little Colorado River, Dean W. Blinn, 8
downturned apex. Inferior appendages June 2003, 2$; same, 9 June 2003, \$;
broadly separated ventromesally; direct- light trap, Rosey Creek at Highway 373,
ed caudad with nearly acute apex, near Greer, Dean W. Blinn, 2 July 2003,
extending caudally as far as intermediate 1 2. Rosey Creek female designated allo-
appendages. Parameres extending be- type and deposited at California Acade-
yond endophallus; apical 1/4 expanded my of Sciences, San Francisco, CA, with
with marginal fringe of strong setae. holotype. Remainder of material placed
Female genitalia (Figs. 5 7).' Median in author's collection.
lobe of subgenital plate subequal to
lateral lobes; narrowest at apex; apex Acknowledgments
narrow, nearly acute. Lateral lobes of
subgenital plate roughly parallel; separat- I thank Dean W. Blinn for his contin-
ed laterally from 8th segment. Subgenital ued search for, and collecting at, these
small isolated habitats and providing the
plate broad. Ventral lateral lobes ofninth
large, quadrate, distinctly separated from material onwhichthis paperisbased. The
Ohio Biological Survey kindly provided
tergum, nearly fused mesally. Ninth
tergum broad dorsally; ventrolaterally permission for reuse ofthe male figures. I
slightly separated from IQth. Tenth seg- also thank three reviewers for comments
ment strongly sclerotized, comprised of which improved this paper.
a complete cylinder; dorsal lateral appen-
dages separated from 10th; apex of IQth Literature Cited
with bladelike dorsal lateral lobes, dor- Nimmo, A. P. 1991. Seven new species of
somesal margin concave, ventromesal Limnephihis from western North America with
margin, acutely convex. Spermatheca description of female of L. pallens (Banks)
(Trichoptera: Limnephilidae, Limnephilinae,
with spermathecal vestibule globular,
Limnephilini). Proceedings ofthe Entomolog-
smoothly merged with spermathecal ical Society ofWashington 93(2): 499-508.
body, with constriction at confluence of Ruiter, D. E. 1995. The adult Limnephihis Leach
vestibule with body; chitinous spermathe- (Trichoptera: Limnephilidae) of the New
cal ring tapered, cap-like; no constriction World. Ohio Biological Survey Bulletin, New
below chitinous ring; additional sper- Series 11(1): iv + 200 pp.
Schmid, F. 1955. Contribution a I'etude des
mathecal gland located about one width
Limnophilidae (Trichoptera). Mitteilungen
of spermathecal vestibule from sper- der Schweizerischen Entomologischen Gesell-
mathecal vestibule; entire inner surface schaft 28: 1-245.