Monogenetic Trematodes, I — Yamaguti 
71 
receptacles filled with sperm, occasionally also 
with a mass of yolk cells, connected with arms 
of vitelline reservoir just medial to intestine, 
that of the same side as the vas deferens lies be- 
tween the vas deferens and the intestine of that 
side. I propose to call this receptacle "recep- 
taculum seminis vitellariorum.” Vagina funnel- 
shaped, symmetrical, marginal, 0.28-0.6 mm 
from head end, nearer to genital pore than to 
intestinal bifurcation; vaginal ducts of two sides 
joining together in form of V, but no duct com- 
municating with the vitelline reservoir has been 
detected. 
DISCUSSION: This genus apparently belongs 
to Diclidophoroidea Price, 1936, but cannot be 
placed in any known families of this super- 
family because of the constant peculiar asym- 
metry of the opisthohaptor and the presence of 
symmetrical seminal receptacles connected with 
the arms of the vitelline reservoir in full-grown 
specimens. That the vaginal ducts are united and 
have connection neither with the vitelline res- 
ervoir nor with the seminal receptacles is worth 
noting. 
Pseudodiclidophorinae n. subf. 
SUBFAMILY DIAGNOSIS: Pseudodiclidophori- 
dae: Opisthohaptor asymmetrical, with four 
pairs of clamps along posterolateral margin of 
body. No anchor-bearing caudal appendage. 
PSEUDODICLIDOPHORIDAE n. fam. 
FAMILY DIAGNOSIS: Diclidophoroidea: Opis- 
thohaptor developed on posterior lateral part of 
body as marginal frills carrying 4 pairs of asym- 
metrical or symmetrical sessile clamps; each 
clamp with accessory sclerites. Caudal appendage 
present or absent. Symmetrical prohaptoral suck- 
ers in buccal cavity. Intestinal crura with nu- 
merous branches, confluent posteriorly. Testes 
postovarian, variable in number. Copulatory or- 
gan complex in structure. Common genital pore 
median, esophageal. Ovary turned back on it- 
self, pretesticular. Genito-intestinal duct present. 
Symmetrical seminal receptacles connected with 
vitelline reservoir. Vagina present. No commu- 
nication between vagina and vitelline reservoir. 
Vitellaria entirely co-extensive with intestinal 
crura. Parasites of marine fishes. 
TYPE GENUS: Pseudodiclidophora n. g. 
This family includes two subfamilies, Pseudo- 
diclidophorinae n. subf. and Allopseudodiclido- 
phorinae. These subfamilies can be distinguished 
one from the other by the opisthohaptor being 
symmetrical or asymmetrical, by the presence or 
absence of an anchor-bearing caudal appendage. 
Pseudodiclidophora n. g. 
GENERIC DIAGNOSIS: Pseudodiclidophoroidae, 
Pseudodiclidophorinae: Body markedly tapered 
anteriorly. Clamps sessile, 4 on each side of pos- 
terior part of body, arranged asymmetrically, the 
fourth clamp wider apart from the third than 
the second is from the third, especially on one 
side; clamp skeleton consisting of 2 pairs of 
lateral sclerites, an unpaired median piece, ac- 
cessory sclerites and small basal sclerites. Pro- 
haptoral suckers aseptate, unarmed. Esophagus 
simple, long. Intestinal crura confluent posteri- 
orly. Testes numerous, confined to postovarian 
interintestinal field. Cirrus forming a small 
sclerotized cylinder, ventral to semicircle of ar- 
ticular rods which is enclosed in the genital 
atrium of very fine circular muscle fibers. Com- 
mon genital pore ventromedian, far anterior to 
intestinal bifurcation. Ovary inverted U-shaped, 
in midregion of body, with both ends directed 
backwards. Genito-intestinal duct long, opening 
into right intestinal crus. Symmetrical seminal 
receptacles connected with both arms of vitel- 
line reservoir, very conspicuous in full-grown 
specimens. Eggs with filament at each pole. 
Vagina symmetrical, vaginal ducts united to- 
gether, without any connection with vitelline 
reservoir or seminal receptacles. Vitellaria co- 
extensive with intestine and its branches. Vitel- 
line reservoir Y-shaped. Gill parasites of marine 
teleosts. 
type species: P. decapteri n. sp., on Decap- 
terus pinnulatus; Hawaii. 
9. Allopseudodiclidophora opelu n. g., n. sp. 
Fig. 9 
HABITAT: Gills of De cap ter us pinnulatus 
(local name "opelu”); Hawaii. 
HOLOTYPE: U. S. Nat. Mus. Helm. Coll., S.Y. 
No. 9. 
Fig. 8. Pseudodiclidophora decapteri n. g., n. sp. 8A, Holotype, ventral view; 8B, clamp, ventral view; 
8C, male terminal genitalia, ventral view; 8D, egg. 
