Trematodes of the family Heterophyidae (Digenea) in Mexico: a review of species and new host and geographical records
Author
Scholz, T.
Author
Aguirre-Macedo, M. L.
Author
Salgado-Maldonado, G.
text
Journal of Natural History
2001
2001-12-31
35
12
1733
1772
http://www.tandfonline.com/doi/abs/10.1080/00222930152667087
journal article
10.1080/00222930152667087
1464-5262
5275922
Ascocotyle
(
Ascocotyle
)
leighi
Burton, 1956
Metacercaria
Morphology
.
Sogandares-Bernal and Lumsden (1964)
did not describe metacercariae found in
Mexico
.
Second intermediate hosts
.
Belonesox belizanus
Kner
,
Poecilia sphenops
Valenciennes
in Cuvier and Valenciennes (
Poeciliidae
).
Site
of infection
. Heart.
Distribution
. YucataÂn (Progreso).
References from
Mexico
.
Sogandares-Bernal and Lumsden (1964)
.
Specimens deposited
. None.
Comments
.
Sogandares-Bernal and Lumsden (1964)
found metacercariae of
A.
(
A.
)
leighi
in two poeciliid ®sh from Progreso, YucataÂn, most probably from CheleÂm lagoon. However, the authors did not provide any data on the morphology of metacercariae.
Metacercariae of
A.
(
A.
)
leighi
are encysted exclusively in the heart and they have been found in poeciliid and cyprinodonti d ®sh in the
USA
and
Mexico
(
Burton, 1956
;
Sogandares-Bernal and Bridgman, 1960
;
Sogandares-Bernal and Lumsden, 1964
). They diOEer from those of
A.
(
A.
)
tenuicollis
encysted in the heart as well mainly in the number of circumoral spines (
48±52 in
total, i.e.
24±26 in
each row, in the former taxon versus 32, i.e. 161
16 in
A.
(
A.
)
tenuicollis
) (
Burton, 1956
,
1958
;
Scholz
et al
., 1997a
).
Salgado-Maldonad
o and Kennedy (1997)
, and Salgado-Maldonad
o
et al
. (1997)
reported metacercariae of
A.
(
A.
)
leighi
from the gills, mesenteries, heart and kidney of several species of cichlids from southeastern
Mexico
. Although few reference specimens were preserved and available to the present authors, it is possible to assume that most, if not all, metacercariae previously reported as
A. leighi
were misidenti®ed and belonged to other species of the
Ascocotyle-
complex. Metacercariae from internal organs of cichlid, characid and poeciliid ®sh were conspeci®c with
A
. (
P
).
nana
and those encysted in the gills of cichlids with
A.
(
A.
)
nunezae
. Metacercariae encysted in the heart of ®sh of diOEerent families might belong to
A.
(
A.
)
leighi
but all voucher specimens examined were conspeci®c with
A.
(
A
.)
tenuicollis
.
Adult trematodes of
A.
(
A.
)
leighi
are not known from
Mexico
because specimens found in the intestine of
Casmerodius albus
from PaÂtzcuaro Lake (MichoacaÂn), identi®ed by G. PeÂrez Ponce de LeoÂn as
A
.
leighi
(
Lamothe-Argumedo
et al.
, 1997
; CNHE 1532), belonged in fact to
A
. (
A
.)
tenuicollis
(®gure 2).