A new species of Hydropsyche (Trichoptera: Hydropsychidae) from Alabama, with notes on H. frisoni ross and an unusual Hydropsyche from Florida

2006·3.8 MB·

by  Paul K Lago

PROC. ENTOMOL. SOC. WASH.
108(3), 2006, pp. 559-564
A NEW SPECIES OF HYDROPSYCHE (TRICHOPTERA:
HYDROPSYCHIDAE) FROM ALABAMA, WITH NOTES ON #H. FRISONI
ROSS AND AN UNUSUAL HYDROPSYCHE FROM FLORIDA
PAUL K. LAGO AND STEVEN C. HARRIS
(PKL) Department of Biology, University of Mississippi, University, MS 38677,
U.S.A. (e-mail: [email protected]); (SCH) Department of Biology, Clarion
University, Clarion, PA 16214, U.S.A.
Abstract.4Hydropsyche fenestra, n. sp., belonging to the scalaris group and
collected in central Alabama, is described and illustrated. Variation in Hydropsyche
frisoni Ross is discussed with illustrations provided to facilitate identifications. In
addition, figures of a deformed Hydropsyche from northern Florida, which appears
to represent an undescribed species, are presented.
Key Words: WHydropsychidae, Hydropsyche scalaris group, Alabama, Florida
The genus Hydropsyche is well repre- ter examining the holotype and numer-
sented in the southeastern United States, ous paratypes of H. frisoni, we concluded
with 24 species reported, or about half of that we were dealing with one variable
all known North American members of species. By providing additional illustra-
the genus. Our ongoing caddisfly studies tions, we hope to facilitate the identifi-
in the region have uncovered a distinctive cation of H. frisoni in the southeastern
new species from Alabama, where 23 United States.
species have been previously recorded Finally, in processing a number of
(Harris et al. 1991). The new species was caddisfly collections taken by Andy
collected in the west-central part of the Rasmussen in the panhandle region of
state near the juncture of the Cumber- Florida, we encountered two specimens
land Plateau and East Gulf Coastal Plain of a deformed Hydropsyche that appear
physiographic provinces. to represent a new species. The male
A second Hydropsyche encountered in specimens were unusual in that one side
our Alabama collections, Hydropsyche of the genitalic structures were entire; the
frisoni Ross, appeared to show distinct other side appeared contorted and mal-
differences from the Illinois specimens formed. With no complete individuals,
illustrated by Ross (1944). After exam- we are unwilling to assign a species name
ining over a thousand specimens from at this time. We have, however, provided
Alabama, we decided that either the illustrations and a brief description hop-
Alabama material represented a new, ing this might assist recognition as
but closely related, species or that H. additional material becomes available.
frisoni exhibited considerable variation. Morphological terminology follows
Since Alabama represents the southern- that of Schmid (1980). The holotype of
most range of this species, either of the the new species will be deposited in the
above scenarios seemed reasonable. Af- National Museum of Natural History,
560 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
Hydropsyche fenestra
lanes, le Hydropsyche fenestra, male terminalia. a, Lateral view. b, Tergum IX & X, dorsal view. c,
Inferior appendage, caudal view. d, Apex of phallic apparatus, ventral view. f, Apex of phallic apparatus,
dorsal view.
Washington, DC. The specimens of the (2:3.5). Abdominal segment IX with
Florida Hydropsyche are deposited in the pronounced median dorsal crest. Tergum
personal Gcollectionvol S» ©¬x Haris at X with dorsoapical corner bluntly
Clarion University, PA. Type material of rounded in lateral view, apex truncate;
Hydropsyche frisoni are deposited at the apex in dorsal view with parallel sided,
Illinois Natural History Survey, Cham- rather shallow notch; preanal appendage
paign, IL. Additional material is de- appears as a triangular setiferous wart
posited in the collections of the authors. near posteroventral corner. Inferior ap-
pendage, in caudal aspect, with basal
Hydropsyche fenestra Lago and Harris,
segment moderately long and straight;
new species
apical segment relatively long, nearly
(Eies 1)
one-half as long as base (3:7) and angled
Holotype.4Male. Alabama: Tusca- mesad, tapering slightly from base to
loosa County, Big Sandy Creek off Co. apex; in lateral view, basal segment
Hwy 59, on Gulf States Power property, tapering from narrow base to broader
6 km S>Coaling; 16 8August 1991, <s: apex; apical segment gradually enlarged
Harris (NMNH). in basal half, then abruptly tapering to
Male.4Forewing length 10.2 mm, yel- acute, upturned point. Phallic apparatus
lowish brown in alcohol. Wings mottled tubular, straight in ventral view and
with yellowish spots on brown back- distinctly constricted before apex, this
ground, spots larger and coalescing, constriction also apparent in lateral view:
causing the wing to appear lighter, in apex wider than phallobase, with lateral
apical half. Eyes, in dorsal view, more lobes evenly tapered apically and with
than half as wide as interocular distance ventral edge very slightly sinuate and
VOLUME 108, NUMBER 3 561
concave; lateral flange upturned slightly; these specimens. Fig. 2 provides critical
mesal dome strongly arched and ending views of both Alabama and _ Illinois
before apex of lateral lobe; mesal cavity specimens. The following notes on var-
deep, about 80% open ventrally. lation were made. Variation in size is
Female.4 Unknown. quite apparent within the Alabama series
Etymology.4Latin, fenestra (window), re-examined. Forewing length varies
referring to the unusual <<window=9 seen from 7.7 to 9.9 mm, with a mean of 9.0
between the lateral lobes and the top of (n = 86). In dorsal view, the apex of
the mesal dome of the phallic apex. tergum X is rounded, lacking lateral
Discussion.4The highly arched mesal corners in Alabama_ specimens, but
dome will separate H. fenestra from almost squarely truncate in Illinois speci-
other species of the sca/aris group, except mens, and with a fairly deep, tapering,
H. frisoni. Beyond this character, there 1s rounded notch medially, which extends
little fenestra has in common with the approximately % to % the length of
latter. The notched apex of tergum X tergum X. The notch is relatively longer
in southern specimens. The _ preanal
(dorsal view) actually resembles that of
appendage are somewhat longer than
H. rossi Flint, Voshell and Parker, as
wide and distinctly emarginate on dorso-
does the general shape of the lateral
posterior corner in most Alabama speci-
phallic lobes. However, 1n lateral view,
mens, but more nearly rounded and
the thickened dorsal walls of the mesal
irregularly emarginate to evenly mar-
dome contact the lateral lobes much like
gined dorsally in northern specimens.
a curved forefinger and straight thumb
The apex of the phallic apparatus has the
meeting, leaving a thin walled <window=
mesal dome strongly arched throughout
between them. Within the sca/aris species
the range of the species, but somewhat
group, this configuration is unique to H.
more strongly so in southern specimens,
fenestra.
with the mesal plates extending as small
rounded lobes posteriorly (lateral view4
Hydropsyche frisoni Ross
the individual illustrated in Fig. 2 d-A
(Figs 2)
shows maximum development of this
Hydropsyche_ frisoni was described character) in better developed Alabama
from Illinois by Ross (1938). Since that specimens. No Illinois specimens exam-
time, the species has been reported from ined have this posterior development of
numerous central states, ranging from the mesal plates. In dorsal view, the
Minnesota and Michigan, south to Ala- mesal plates are gradually and distinctly
bama (Harris et al. 1991). Recent con- expanded basally, together nearly tear-
cern about the accuracy of our initial drop shaped. Variation occurs in the
identification of this species led us to width of these plates, but this did not
examine individuals belonging to the seem to be correlated with range. The
type series, and based on our compari- edges of the ventral cavity are evenly
sons, we concluded that Alabama speci- rounded in most specimens, but are
mens do, indeed, represent H. frisoni. slightly angulated in some Alabama
The differences apparent to us initially specimens.
faded during the re-examination of Material examined.4Holotype. IL:
nearly 170 specimens collected from Oakland, along Salt Fork River, 24 April
northern Alabama. In order to facilitate 1925.) TucBrson, .¢3 (paratypes: same
recognition of this species, it seemed locality, 6 July 1927, T. Frison, 5 2.
appropriate to detail some of the varia- AL: Bibb Co. Little Cahaba River @
tion that first brought our attention to Bulldog Bend, 13 May 1981, S.C. Harris,
562 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
Hydropsyche frisoni
o&f FXpi,hg a.ld lo2ir.cs ala Hpypvdairreaow.tp ussyc,c, hIedn ofrefrsriaiolsr o nviai,pe wpm.ea nldea gtee,r micnaauldiaal. viAe w= . Adl,a bAapmeax, ofI =p haIlllliicno isa.p paa,r aLtautse,r alv evniterwa.l bv.i eTwe. rgf,u mA peIxX
P. O9Neal, 46 4; same location, 12 Sept. Fork @ Cleveland, 15 May 1988, P.
1981, Sie, Harris, P. O7 Neal, 15:4 same O9Neal, T. Shepard, 38 ¢: Jefferson Co.
location, 10 May 1982, S.C. Harris, 4 2: Cahaba River @ Camp Coffman, 24
Little Schultz Creek @ Schultz Creek May 1981, S.C. Harris, P. O9Neal, 15 ¢@:
Church, 6.6 mi N Centerville, S.C. Har- same locality, 13 Sept. 1981, S.C. Harris,
ris, | 4; same location, 13 April 1982, P. O9Neal, 1 &; Turkey Creek nr.
S.C. Harris, 17 ¢; Blount Co. Locust Morris, 26 June 1985, P: O9Neal, 15 ¢@:
VOLUME 108, NUMBER 3
NnO O eS)
Hydropsyche sp.
Fig. 3. Hydropsyche sp., male terminalia. a, Lateral view. b, Tergum IX & X, dorsal view. c, Inferior
appendage, caudal view. d, Apex of phallic apparatus, ventral view. f, Apex of phallic apparatus,
dorsal view.
Tuscaloosa Co. Mud Creek @ Tannahill and H. rossi (A. Rasmussen, personal
Statesrank,. 20 June 1991, S.C. Harris, 13 communication).
3S; Shelby Co. Cahaba River @ Helena, Male.4Forewing length 10 mm, mot-
17 Sept. 1991, S.C. Harris, 9 ¢. tled yellowish brown in alcohol, with
region between R>,3 an M, nearly devoid
Hydropsyche sp. of brownish coloration, except distally,
(i19,-3) thus producing a clear window. Eyes, in
dorsal view, half as wide as interocular
During a recent survey of caddisflies
width. Abdominal segment IX with pro-
conducted at the Apalachicola Bluffs
nounced median dorsal crest. Tergum X
and Ravine Preserve, Liberty County,
somewhat difficult to describe because of
Florida, two specimens of an unrecog-
nized species of Hydropsyche (scalaris deformity, but left side in best developed
specimen with dorsal apical corner
group) were collected, one in May, the
other in October. The specimens, both rounded in lateral view giving the im-
males, were deformed on the right side of pression that a median cleft exists
the abdominal apex, the deformity af- (similar to the condition seen in various
fecting the inferior appendage and the members of the group, such as H.
tergum of the tenth segment. The left scalaris Hagen and H. frisoni); preanal
side in both cases, however, was intact, appendage appears as a rounded setifer-
as was the phallic apparatus in each. The ous wart near posteroventral corner.
two specimens bear only vague resem- Inferior appendage, in caudal view, with
blance to the only additional members of basal segment moderately long and
the scalaris group known to occur in the straight, slightly enlarged apically, apical
area, Hydropsyche incommoda Hagen segment rounded apically and one-third
564 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON
length of base; in lateral view, basal Hopefully, specimens without deformi-
segment tapering from narrow base to ties will be obtained through continued
broader apex, apical segment slightly collecting in the area and the identity of
constricted in basal half, apical half these unusual individuals can be ascer-
evenly convex on posterior margin and tained.
diagonally truncate on anterior margin, Material examined.4FL: Liberty Co.
tapering to distinct point. Phallic appa- Little Sweetwater Creek, Apalachicola
ratus tubular, nearly straight in ventral Bluffs and Ravine Preserve, 5km N.
view, phallobase slightly inflated in Bristol, N30.2821-W84.5908, 26 Oct
apical two-thirds and distinctly con- 1995, M. Pescador, A. Rasmussen, | 2;
stricted before apex; in lateral view, same locality, but label includes <8site 6,=
sinuate, swollen ventrally before apex; 19 May 1994, M. Pescador, A. Rasmus-
apex approximately as wide as phallo- sen, SiC. Hanssy lc.
base; lateral lobes tapered apically,
ACKNOWLEDGMENTS
slightly convex on dorsal 4 surface,
straight ventrally, without mesal dome, Colin Favret and Kathy Methven
mesal cavity very deep, approximately Zeiders of the [linois Natural History
85% open ventrally. Survey, Champaign, were very helpful in
Discussion.4 Although obviously be- providing specimens of Hydropsyche
longing to the scalaris group, these frisoni for this study. We thank Andy
specimens do not resemble to any extent Rasmussen, Florida A&M _ University,
previously described species, and we Tallahassee, for bringing the Florida
believe they represent a new species. specimens to our attention.
There is a temptation to simply dismiss
the specimens as deformed individuals of LITERATURE CITED
H. incommoda, the species most com- Flint, O. S., Jr., J. R. Voshell, Jr., and C. R. Parker.
monly collected in the study area, based 1979. The Hydropsyche scalaris group in
on the shape of tergum X and the Virginia, with the description of two new
species (Trichoptera: Hydropsychidae). Pro-
inferior appendages. The length propor-
ceedings of the Biological Society of Washing-
tions of the inferior appendage segments
ton 92: 837-862.
are, however, quite different, being 4: 1 Haris. S) ©. PEs © Neilvand) Bakes acousSSir
in H. incommoda and 3:1 in the de- Caddisflies of Alabama. Geological Survey of
formed individuals. Differences 1n phallic Alabama, Bulletin 142: 1-442.
Ross, H. H. 1938. Descriptions of Nearctic caddis
structure are also apparent, with the
flies (Trichoptera) with special reference to the
phallobase being somewhat more sinu-
Illinois species. Illinois Natural History Sur-
ous in the deformed specimens (compare vey, Bulletin 21: 1014183.
Pics sowith Pic lin Plintyetvalei979): . 1944. The caddis flies, or Trichoptera, of
The mesal cavity in H. incommoda is Illinois. Illinois Natural History Survey, Bul-
letin 23: 1-326.
shallow, but is very deep in the speci-
Schmid, F. 1980. Genera des Trichopteres du
mens in question; however, the ventral
Canada et Etats adjacents, part 7. In Les
opening does not differ significantly in insectes et arachnides du Canada. Agriculture
either shape or extent to which it is open. Canada, Ottawa, 296 pp.