72 
PACIFIC SCIENCE, Vol. XIX, January 1965 
DESCRIPTION (based on seven whole mounts) : 
Body markedly attenuated anteriorly, 2. 9-4.6 
mm in length exclusive of anchor-bearing caudal 
appendage, with maximum width of 0.96-1,8 
mm in testicular region. Opisthohaptor sym- 
metrical, consisting of four pairs of small sessile 
clamps about 10/x in diameter, extending along 
posterior margin of body, with caudal appendage 
between. Clamp skeleton similar to that of Pseu- 
dodiclidophora decapteri with A-shaped acces- 
sory piece; the left dorsal sclerite is slender and 
jointed, whereas the right ventral sclerite is 
slender and unjointed, so that the lateral sclerites 
are asymmetrical; median spring bifid at both 
ends, dorsal prong longer than ventral. Caudal 
appendage 0. 5-1.0 X 0.1-0.12 mm, provided at 
its somewhat swollen distal end with three pairs 
of hook-shaped anchors; outer anchor 45-50g 
long, with very prominent guard; middle anchor 
similar In shape, 18/a long; inner anchor 20-22/a 
long, also with prominent guard and recurved 
root. Head rather pointed, about 0.09-0.12 mm 
wide. Prohaptoral oral suckers paired, rounded, 
aseptate, unspined, 30-45/a In diameter; pharynx 
bulbous, 35 X 30 /a in the type; esophagus 0.7- 
1.5 mm long, intestinal limb with short inner 
and longer outer branches, apparently united 
with each other at posterior end of body proper. 
Testes transversely elongated, irregular in 
outline, 12 — 30 in number, occupying whole post- 
ovarian interintestinal field in two longitudinal 
rows; vas deferens middorsal, distended with 
sperm and strongly winding in one of the para- 
types, but very narrow and straight in the type. 
Cirrus terminating in form of a sclerotized cylin- 
der projecting into genital atrium. This cirrus is 
supported dorsally by a pair of apically incurved 
rods 35/a long, a pair of also apically incurved 
lateral rods 48-50/a long and a pair of nearly 
parallel, apically enlarged, dorsal rods. Genital 
atrium 55-62/a long by 40-5 0/x wide, with wall 
of circular muscle fibers. Genital pore midven- 
tral, 0.25-0.68 mm from head end. 
Ovary inverted U-shaped, 0.4-0.8X0.15-0.2 
mm, situated at junction of middle with pos- 
terior third of body, with both ends directed 
backwards; genito-Intestinal canal crossing dis- 
tal end of ovary and opening into right intestinal 
limb. One uterine egg observed, 0.17 X 0.07 mm, 
with rigid filament 0.16 mm long at one pole 
and another 0.2 mm long at the other pole. 
Vitellaria co-extensive with intestinal branches; 
vitelline reservoir Y-shaped, nearly midventral; 
its arms widely divergent, each connected with 
seminal receptacle of its own side. Paired semi- 
nal receptacles elongate fusiform, 0.2-0.43 mm 
long, containing abundant yolk cells and sperm, 
situated one on each side of ovary at level of 
junction of middle with posterior third of body. 
Vaginae symmetrical, funnel-shaped at base, 
opening ventrolaterally by a small round pore at 
a distance of 0.4-1. 2 mm from head end; the 
vaginal duct arising from the bottom of the 
vaginal funnel proceeds medioposteriad to unite 
with Its fellow of the other side, the resulting 
unpaired median duct runs backward and ap- 
parently empties into the vitelline reservoir at 
junction of the two arms. It is worth while to 
note that sperm are seen scattered in various 
parts of the vitelline ducts. This fact may be ac- 
counted for by the presence of paired semi- 
nal receptacles connected with the arms of the 
Y-shaped vitelline reservoir. 
DISCUSSION: Although this genus differs 
markedly from Pseudodididophora (loc. cit.) in 
general body shape, it agrees completely with 
the latter in the most important characters such 
as clamp structure and internal anatomy, par- 
ticularly in possessing paired receptaculum 
seminis vitellariorum. The presence of a long 
anchor-bearing caudal appendage, however, pre- 
vents its being assigned to the same genus. I 
would rather consider this character combined 
with the symmetrical arrangement of the opistho- 
haptoral clamps to be of subfamily importance, 
hence a new subfamily Allopseudodiclidophori- 
nae Is proposed. 
Allopseudodiclidophorinae, n. subf. 
SUBFAMILY DIAGNOSIS: Pseudodiclidophori- 
dae: Opisthohaptor symmetrical, with 4 pairs of 
Fig. 9. Allopseudodiclidophora opelu n. g„, n. sp. 9 A, Holotype, ventral view; 9B, clamp, ventral view; 
9C-E, caudal anchors; 9F, male terminal genitalia, ventral view. 
