Redescription of Vandellia beccarii (Siluriformes: Trichomycteridae) from Guyana

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234

COPEIA, 1987, NO. 1
AND
D. B.
SUTHERLAND. 1965, Respiratory
metabolism of pumpkinseed
(Lepomis gibbossus)
in
relation to swimming speed.
Ibid.
22:405-409.
CRAWSHAW,
L. I., D. E.
LEMONS,
M.
PARMER AND
J.
M.
MESSING.
1982. Behavioral and metabolic as-
pects of low temperature dormancy in the brown
bullhead,
Ictalurus nebulosus.
J. Comp. Physiol. 148:
4
1-47.
GORDON,
M. S., I.
BOETIUS,
D. H.
EVANS,
R. Mc-
CARTHY AND
L. C.
OGLESBY.
1969. Aspects of the
physiology of terrestrial life in amphibious fishes I.
The mudskipper, Periophthalmus sobrinus.
J. Exp.
Biol. 50:141-149.
GRAHAM,
J. B. 1973. Terrestrial life of the amphib-
ious fish
Mnierpes macrocephalus.
Mar. Biol. 23:83-
91.
HILLMAN,
S. S.,
AND M.
S.
LEA.
1983. Aerial activity
oxygen consumption during metamorphis of the
bullfrog,
Rana catesbeiana.
Copeia 1983:407-410.
SEYMOUR,
R. S. 1973. Physiological correlates of
forced activity and burrowing in the spadefoot toad,
Scaphiopus hammondii. Ibid.
1973:103-115.
TAMURA,
S. 0., H.
MoRn AND M. YUZURIHA.
1976.
Respiration of the amphibious fishes
Periophthal-
mus cantonensis
and
Boleopthalamus chinensis
in water
and on land. J. Exp. Biol. 65:97-107.
TEAL,
J. M.,
AND
F. G.
CAREY.
1967. Skin respiration
and oxygen debt in the mudskipper
Periophthalmus
sobrinus.
Copeia 1967:677-679.
WITHERS,
P. C. 1980. Oxygen consumption of pleth-
odontid salamanders during rest, activity, and re-
covery.
Ibid.
1980:781-787.
AND
S. S.
HILLMAN.
1981. Oxygen con-
sumption of
Amphiuma means
during forced activity
and recovery. Comp. Biochem. Physiol. 69A:141-
144.
STANLEY S. HILLMAN AND PHILIP C. WITHERS,
Department of Biology, Portland State University,
P0
Box 751, Portland, Oregon 97207.
Accepted
21 April 1986.
Copeia,
1987(1), PP. 234-237
© 1987 by the American Society of
Ichthyologists and Herpetologists
REDESCRIPTION OF
VANDELLIA BECCA-
RII
(SILURIFORMES: TRICHOMYCTERI-
DAE) FROM GUYANA.-Five species of tn-
chomycterid fishes have been reported from
Guyana by Eigenmann (1912) and Schmidt
(1985). A poorly known sixth species,
Vandellia
beccarii
di Caporiacco (1935), is the subject of
this paper. The holotype from vicinity of Rock-
stone in the Essequibo River, Guyana was the
sole basis of the original description. This paper
supplements that description on the basis of
more extensive material and corrects errors in
the original description.
Materials and methods.
-Meristic and morpho-
metric characters chosen were those reported
by di Caporiacco (1935) for the holotype, with
some proportions recalculated from his data.
Dimensions for body proportions were mea-
sured to nearest 0.1 mm with a pair of dividers.
Preorbital and interorbital distances, eye di-
ameter, and maxillary barbel length were mea-
sured under a stereo microscope with an ocular
micrometer. Maxillary barbel length was mea-
sured from the posterior rictus to the barbel
tip. All other measurements followed Hubbs
and Lagler (1964). Skeletal structures, tooth
counts, and tooth arrangement were examined
in five alizarin stained specimens, one cleared
and four uncleared.
The holotype was examined by Dr. Maria
Luisa Azzaroli (Museo Zoologica de "La Spe-
cola,,, Firenze, Italy). All other specimens are
in the American Museum of Natural History
(AMNH): AMNH 55625-14 specimens: "Brit-
ish Guiana," no other data, 44.0-59.2 mm SL,
including four alizarin stained; and AMNH
55625SW-same locality, 1 specimen cleared
and alizarin stained. AMNH 72082-5 speci-
mens: Guyana, Essequibo District, South Bank
Cuyuni River at Batavia Landing of Guyana
Sawmills, 36-40 mm SL. AMNH 72371-2
specimens, Guyana, Essequibo District, North
Bank Cuyuni River at sandbar just upstream of
Caowry Creek mouth, 33-34.5 mm SL.
Description.-Meristics
and morphometnics for
the holotype are presented first, followed by
range and mean of 21 other specimens in pa-,
rentheses. Standard length (mm): 57 (33.0-59.2,
44.1); dorsal-fin rays: 8(7-10,8.3); anal-fin rays:
6 (6-7, 6.8); pectoral-fin rays: 6 (6); pelvic-fin
rays: 5 (5); SL/head length: 9.5 (7.2-8.8, 8.1);
SL/body depth: 10.4(7.9-19.8, 12.4); SL/pre-
dorsal length: 1.4 (1.3-1.6, 1.4); SL/preanal
length: 1.3 (1.2-1.5, 1.3); SL/prepelvic length:
1.6 (1.5-1.7, 1.6); head length/head width: 1.1
(1.0-1.5, 1.2); preorbital length/eye diameter:
1.3 (1.0-2.1, 1.4); maxillary barbel length/head
length: 0.4 (0.2-0.4, 0.3); and interorbital dis-
tance/eye diameter: 1.0 (0.6-1.1, 0.8).
Most meristic and morphometric measure-
ments from the AMNH specimens closely
matched those of the holotype (di Caponiacco,
1935). di Caporiacco (1935) used the presence

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COPEIA, 1987, NO. 1
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transparent but become white in formalin and
alcohol. In recently collected specimens, two
bands of melanophores on the caudal peduncle
extend onto the caudal fin (Fig. 3). The dor-
solateral band originates anterior of the base of
the dorsal fin and extends along the dorsal mar-
gin of the peduncle at the base of the accessory
caudal-fin rays. The ventrolateral band origi-
nates anterior of the base of the anal fin and
extends along the ventral border of the pedun-
cle. Both bands converge slightly on the caudal
fin. The bands are connected by a vertical line
of melanophores on the caudal fin (visible only
under a microscope). This pigmentation pat-
tern is faintly visible on the holotype (M. L.
1.

/..
Azzaroli, pers. comm.). Specimens with black,
distended intestines show a scattering of sub-
cutaneous ovoid light-colored bodies (possibly
containing fats) over the lateral surface of the
gut (Fig. 3).
Diagnosis. —V. beccarii
can be distinguished from
-!
all other vandellfines by the following combi-
nation of characters: caudal fin square or slight-
ly emarginate; distinctive color pattern of two
dark bands that extend from dorsal and anal fin
converging onto caudal fin; anal-fin rays 6-7;
pectoral-fin rays 6.
Ecology.
—The black flocculent material in the
•

.

..
intestines of several specimens (Fig. 3) is prob-
ably blood.
V.
beccarii,
therefore, is probably
parasitic on larger fishes like all other vandel-
•

.

.

•
limes.. Recent specimens were all free swimming
=
when collected in seines from tidal fresh water
with no indication of what their hosts may be.
Acknowledgments.
—Collecting
in Guyana was
made possible by the consent and encourage-
ment of the Guyanese government. I thank M.
Collins, our friends .in Guyana, and A. Pappan-
•

....
toniou and K. Schmidt for making my collecting
trips successful. Thanks also go to M. Azzaroli
•
..

/
for examining the holotype, C. Ferraris and G.
Benz for reading an early draft of the manu-
i(ii7
..
script, C. Ferraris for clearing and staining spec-
•
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•
imens, K. Schmidt for drawing the illustrations,
•
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and A. Feoli-Keseru for helping translate the
Fig. 3. Lateral view of
Vandellia beccarii,
AMNH
b 1
72082, 38.0 mm SL, showing color pattern and gut
distended with blood. The white flecks on the gut
may be fat deposits.

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