24 
PACIFIC SCIENCE, Vol. XXII, January 1968 
TABLE 1 
Differentiation of Pseudeubothrium 
from Eubothrium 
CHARACTER 
Eubothrium 
Pseudeu- 
bothrium 
Neck 
absent 
present 
Median 
surficial 
furrow of 
strobila 
present 
absent 
Vitellaria 
may extend into 
inner 
longitudinal 
muscle layer 
or even into 
peripheral 
medulla 
never extending 
into medulla 
Uterine pore 
midventral 
submedian or 
sublateral, 
ventral 
Vaginal pore 
anterior to 
cirrus pouch 
ventral to cirrus 
pouch 
the separation of the present genus from Eubo- 
thrium Nybelin, 1922. 
Pseudeubothrium n. g. 
generic diagnosis: Amphicotylidae, Amphi- 
cotylinae Liihe, 1902. Scolex with an apical 
disc and elongate simple bothria. Strobila with 
distinct neck and very short, transversely ex- 
tended, laminate, imbricated proglottides. No 
median furrow on each flat surface of strobila. 
Testes in dorsal medulla, continuous in median 
field except in ovarian region. Vas deferens 
convoluted in dorsal medulla. Cirrus pouch 
with thick muscular wall. Ejaculatory duct 
winding in cirrus pouch; cirrus swollen bul- 
bously and lined with reticular basket-like 
cuticle which is continued onto the ejaculatory 
duct, where the network becomes reduced and 
appears like spinelets or cilia in cross sections. 
In cross sections of the cirrus the lining may 
appear like spines. Genital pore lateral, alternat- 
ing irregularly. Ovary transversely elongated 
in ventral median medulla. Vitellaria confined 
to laminate cortex all around proglottis, never 
extending into medulla. Vaginal duct ciliated; 
vagina proper enlarged, with smooth cuticle, 
opening into genital atrium ventral to cirrus 
pouch. Uterine sac present, muscular; uterine 
pore ventral, submedian or sublateral. Eggs com- 
paratively thick-shelled, embryonated. Paired 
excretory vesicles very conspicuous in posterior- 
most segment. Parasitic in marine teleosts. 
type species: P. xiphiados n. sp., in Xiphias 
gladius; Hawaii. 
2. P seudeubothrioides lepidocybii n. g., n. sp. 
Fig. 2 A-C 
habitat: Intestine of Lepidocybium flavo- 
brunneum; Hawaii. 
holotype: U. S. Nat. Mus. Helm. Coll, 
S. Y. No. 373. 
description (based on a gravid type and 
two immature paratypes ) : Scolex elongate, 1.05 
mm long by 0.47 mm wide in the type, with 
apical disc 0.47 mm wide and incised dors ally 
and ventrally, and an elongate, elliptical, simple 
bothrium on each flat surface; unsegmented 
neck portion about 1.0 mm long. Proglottides 
with salient posterior border; young proglot- 
tides wider than long; gravid ones wider than 
long, or as wide as long, 1.1— 1.8 mm X U6— 
1.9 mm, nearly parallel-sided. Ventral excretory 
stem very wide throughout strobila, ventral to 
vas deferens and vagina, with transverse com- 
missure at posterior end of each proglottis. 
Testes small, round, distributed in medulla 
alongside excretory stem, confluent at posterior 
end of proglottis, very few, if any, in pre- 
ovarian median field. Vas deferens describing 
an arcuate curve along vagina, passing trans- 
versely immediately in front of uterine sac 
and then running toward cirrus pouch. Cirrus 
pouch elliptical, up to 0.35 X 0- 2 mm, lying 
obliquely between excretory stem and lateral 
margin; ejaculatory duct winding in cirrus 
pouch; no bulbous cirrus in strong contrast with 
Pseudeubothrium xiphiados n. sp. Genital 
atrium opening marginally near anterior end of 
proglottis on the same side as uterine pore, 
alternating irregularly from side to side. 
Ovary bipartite, median, immediately in front 
of transverse excretory commissure. Uterine sac 
comparatively small, on pore side of median 
line near anterior border of proglottis, with 
inconspicuous ventral pore in immature pro- 
glottides. In gravid proglottides the uterus filled 
with eggs takes an arcuate course like the vas 
deferens and vagina, and finally opens into the 
uterine sac which is now an elliptical muscular 
