Comparative Parasitology 67(1) 2000 - Peru State College

the gill baskets of some hosts were fixed in hot
(~90°C) 4% formalin according to methods presented
by Scholz and Hanzelova (1998); specimens fixed in
hot formalin had extended or relaxed peduncles, while
those fixed in ambient formalin (=30°C) had contracted
peduncles. Measurements, all in micrometers, were
made with a filar micrometer according to procedures
of Mizelle and Klucka (1953), except that length of
the inale copulatory organ is an approximation of total
length obtained by using a calibrated Minerva curvimeter
on camera lucida drawings; average measurements
are followed by ranges and the number (n) of
specimens measured in parentheses; unstained flattened
specimens mounted in Hoyer's or Malmberg's
media were used to obtain measurements of hooks,
anchors, and the copulatory complex; all other measurements
were obtained from unflattened specimens
stained with Gomori's trichrome or Mayer's carmine
and mounted in Canada balsam. Voucher specimens of
helminths collected during this study were deposited
in the United States National Parasite Collection
(USNPC), Beltsville, Maryland, U.S.A., and the helminth
collections of the University of Nebraska State
Museum (HWML), Lincoln, Nebraska, U.S.A.; the Institute
dc Biologfa, Universidad Nacional Autonoma
de Mexico (UNAM), Mexico City, Mexico; the Parasitology
Laboratory, Center for Investigation and Advanced
Studies of the National Polytechnic Institute
(CINVESTAV-IPN) (CHCM), Mcrida, Mexico, and
the Institute of Parasitology, Academy of Sciences of
the Czech Republic (IPCAS), Ceske Budejovice,
Czech Republic, as indicated in the following redescriptions.
For comparative purposes, the following
specimens were examined: 2 voucher specimens of U.
chavarriai (USNPC 73178) and 3 voucher specimens
of U. travassosi (USNPC 73179), both lots deposited
by Molnar et al. (1974); holotype and 9 paratypes of
Urocleidoides robustus Mizelle and Kritsky, 1969
(USNPC 71009, 73565, HWML 22941); and a voucher
specimen of Philocorydoras sp. (probably =U. margolisi
Molnar, Hanek, and Fernando, 1974) (USNPC
88965).
Results
Class Monogenoidea Bychowsky, 1937
Order Dactylogyridea Bychowsky, 1937
Dactylogyridae Bychowsky, 1933
Ameloblastella gen. n.
DIAGNOSIS: Body fusiform, slightly flattened
dorsoventrally, comprising cephalic region,
trunk, peduncle, haptor. Tegument smooth. Two
terminal, 2 bilateral cephalic lobes; 3 bilateral
pairs of head organs; cephalic glands unicellular,
lateral or posterolateral to pharynx. Eyes absent;
accessory eye granules subspherical. Mouth subterminal,
midventral, anterior to pharynx; pharynx
muscular, glandular; esophagus present; 2
intestinal ceca confluent posterior to gonads,
lacking diverticula. Genital pore midventral near
level of intestinal bifurcation. Gonads intercecal,
KRITSKY BT AL.—DACTYLOGYRIDS FROM MEXICAN CENOTES 77
overlapping; testis dorsal to germarium. Vas deferens
looping left intestinal cecum; seminal vesicle
a dilation of vas deferens. Copulatory complex
comprising basally articulated male copulatory
organ, accessory piece. Male copulatory
organ tubular, coiled; coil with counterclockwise
rings (see Kritsky et al., 1985). Accessory piece
with complex distal region serving as guide for
male copulatory organ, articulation piece extending
within rings to base of male copulatory
organ. Seminal receptacle pregermarial; vaginal
aperture sinistral; vitellaria coextensive with intestine.
Haptor globose to subhexagonal, armed
with dorsal, ventral anchor/bar complexes, 7
pairs of similar hooks; hook distribution ancyrocephaline
(Mizelle, 1936; see Mizelle and
Price, 1963). Ventral bar with posteromedial
projection. Hook with shank comprising 2 subunits;
proximal subunit expanded. Parasites of
the gills of neotropical pimelodid catfishes (Siluriformes).
TYPE SPECIES: Ameloblastella chavarriai
(Price, 1938) comb. n. ( = Cleidodiscus chavarriai
Price, 1938) from R. rogersi (Regan), R.
guatemalensis (Giinther), Rhamdia sebae (Valenciennes,
1840), and R. quelen (Quoy and Gaimard)
in Costa Rica, Mexico, and Trinidad, respectively.
OTHER SPECIES: Ameloblastella tnamaevi
(Kritsky and Thatcher, 1976) comb. n. (= Urocleidoides
mamaevi Kritsky and Thatcher,
1976) from Cephalosilurus zungaro (Humboldt,
1833) in Colombia, South America.
Ameloblastella platensis (Suriano and Incorvaia,
1995) comb. n. ( — Vancleaveus platensis
Suriano and Incorvaia, 1995) from Pirnelodus
clarias maculatus (Lacepede, 1803) in Argentina,
South America.
ETYMOLOGY: The generic name is from
Greek (amel/o — neglected + blast/o = germ,
branch) appended to the diminutive ending
(-ella), and refers to the long period before recognition
of generic placement of its members.
REMARKS: Ameloblastella gen. n. is primarily
characterized by dactylogyrids with 1) overlapping
gonads (testis dorsal to germarium); 2)
subspherical accessory eye granules; 3) a basally
articulated male copulatory organ and accessory
piece; 4) a coiled male copulatory organ with
counterclockwise rings; 5) a ventral bar with a
medial process; 6) a seminal vesicle formed by
a simple dilation of the vas deferens; 7) inflated
hook shanks, each composed of 2 subunits
Copyright © 2011, The Helminthological Society of Washington