434 
PACIFIC SCIENCE, Vol. XX, October 1966 
discussion: This genus is very closely re- 
lated to Allopseudaxinoides Yamaguti, 1965, 2 
in general internal anatomy, but differs from 
it in the arrangement of clamps and in posses- 
sing septate oral suckers but no reticular anas- 
tomosis of the anteriormost vitelline ducts. 
On the basis of these differences I prefer to 
create the new genus Cypselurobranchitrema, 
for which a new subfamily Cypselurobranchi- 
trematinae is suggested, because this genus can- 
not be assigned to Allopseudaxininae Yamaguti, 
1963. 
Cypselurobranchitrematinae n. subfam. 
subfamily diagnosis: Axinidae. Body elon- 
gate, moderately wide. Opisthohaptor twisted 
fan-shaped, attached on ventral side of body 
proper at its posterior end, fringed with a 
number of stalked clamps in semicircular row. 
Oral suckers paired, septate, within oral cavity. 
Intestine strongly ramified. Testes numerous, 
pre- and paraovarian. Genital atrium enclosing 
armature of complex structure, opening mid- 
ventrally. Ovary tubular, in midregion of body. 
Genito-intestinal duct present. Eggs filamented. 
Paired vaginae rudimentary or absent. Vitellaria 
coextensive with intestine and its branches. Gill 
parasites of marine fishes. 
Cypselurobranchitrema n. g. 
generic diagnosis: Axinidae, Cypseluro- 
branchitrematinae. Body moderately large, 
abruptly tapered anteriorly. Opisthohaptor 
asymmetrical, arising from posterior midventral 
region of body proper, with a twisted semi- 
circular body fold, which is followed by a 
fan-shaped fold fringed with a semicircular 
row of a number of stalked clamps; clamp 
skeleton similar to that of Allopseudaxinoides 
Yamaguti, 1965. Caudal appendage with an- 
chors of different shape and size on stalk of 
last clamp. Intestinal limbs with short inner 
and longer outer branches. Testes small, ar- 
ranged in two longitudinal rows, pre- and para- 
2 The original diagnosis of this genus is emended 
as follows: "Vaginae rudimentary, opening dorso- 
submarginally at about level of genital pore or absent. 
Anteriormost vitelline ducts of two sides with reticu- 
lar anastomosis.” 
ovarian. Prostate cells around distal end of vas 
deferens; ejaculatory duct enclosed in muscle 
bulb. Cirrus represented by a cylinder of very 
fine acicular spines, surrounded basally by a 
ring of hooks, which in turn is enclosed in 
atrial bulb with thick walls of radial muscle 
fibers. Genital atrium opening ventral to esoph- 
agus. Ovary inverted U-shaped, submedian, 
in midregion of body. Genito-intestinal duct 
opening into right intestinal limb. Eggs with 
rigid filament at each pole. Vitelline follicles 
small, largely coextensive with intestine and 
its branches, with which they extend into the 
stalk of clamps. Vaginae indistinct or opening 
symmetrically on ventral submarginal surface 
a little behind level of genital pore. Parasitic on 
gills of marine teleosts. 
type species: C. spilonotopteri n. sp., on 
Cypselurus spilonotopterus ; Hawaii. 
REFERENCES 
Caballero y C. E., M. Bravo Hollis, and 
R. G. Grocott. 1954. Helmintos de la 
Republica de Panama. XII. Descripcion de 
dos nuevos trematodos monogeneos, parasitos 
de peces marinos comestibles del Oceano 
Pacific© del Norte. Ciencia, Mexico 14(4-6) : 
81-86. 
Johnston, T. H. 1931. New trematodes from 
the subantarctic and antarctic. Australian J. 
Exp. Biol. Med. Sci. 8:91-98. 
Tripathi, Y. R. 1959. Monogenetic trematodes 
from fishes of India. Indian J. Helminthol. 
9(1-2): 1-149. 
Unnithan, R. V. 1962. On the functional 
morphology of a new fauna of Monogenoidea 
on fishes from Trivandrum and environs. 
Part II. Opisthogynidae fam. nov. (Gastro- 
cotyloidea) and Abortipedinae subf. nov. 
(Protomicrocotyloidea) . Parasitology 52: 
315-351. 
Yamaguti, S. 1943. Verzeichnis der ektopara- 
sitischen Trematoden der japanischen Fische. 
Published by author. 3 pp. 
1963. Systema Helminthum, Vol. IV. 
Monogenea and Aspidocotylea. Interscience 
Publishers, New York. 699 pp. 
— 1965. New monogenetic trematodes 
from Hawaiian fishes, I. Pacific Sci. 19(1): 
55-95. 
