Cestode Parasites of Hawaiian Fishes 
Satyu Yamaguti 1 
The cestode parasites of Hawaiian fishes 
have never been investigated by previous work- 
ers. The specimens on which the present report 
is based have been collected along with para- 
sites of other groups during our survey of 
Hawaiian fish trematodes. In this collection are 
represented four new genera, two of which be- 
long to the Amphicotylidae, and the others to 
the Parabothriocephalidae and Ptychobothriidae, 
respectively; the other already-known species 
are redescribed and figured in order to supple- 
ment earlier inadequate descriptions. All the 
larval forms, the identification of which is not 
easy, are reserved for a future study. The species 
described herein are listed below: 
Amphicotylidae Ariola, 1899 
1. Pseudeubothrium xiphiados n. g., n. sp. 
2. Pseudeubothrioides lepidocybii n. g., n. 
sp. 
Bpthriocephalidae Blanchard, 1849 
3. Bothriocephalus carangis n. sp. 
4. Bothriocephalus manubriformis Linton, 
1889 
Parabothriocephalidae Yamaguti, 1959 
5. Metabothriocephalus menpachi n. g., 
n. sp. 
Ptychobothriidae Liihe, 1902 
6. Alloptychobothrium spilonotopteri n. 
g., n. sp. 
Lecanicephalidae Braun, 1900 
7. Cephaloboth rium aetobatidis Shipley 
et Hornell, 1906 
I wish to express my appreciation to the 
National Science Foundation for its extended 
financial support (GB-4480), to the professors 
of the University of Hawaii, and to Mr. Shunya 
Kamegai and Mrs; Ikuko Yamaguti, who helped 
me complete the present research. 
1 Hawaii Institute of Marine Biology, University 
of Hawaii. Present address: Beltsville Parasitological 
Laboratory, USD A, ARS, Beltsville, Maryland 20705. 
Manuscript received October 25, 1966. Contribution 
No. 275 from Hawaii Institute of Marine Biology, 
University of Hawaii. 
amphicotylidae Ariola, 1899 
1. Pseudeubothrium xiphiados n. g., n. sp. 
Fig. 1 A-H 
habitat: Intestine of Xiphias gladius; 
Hawaii. 
holotype : U. S. Nat. Mus. Helm. Coll., 
S. Y. No. 372. 
description (based on two immature and 
two gravid specimens; one of the latter was 
cut into serial sections) : Unless otherwise indi- 
cated, the following description is based on the 
gravid whole mount and serial sections. The 
largest specimen preserved in formol-alcohol 
is about 320 mm long by 6 mm wide. The 
type (which was fixed under cover glass pres- 
sure in Schaudinn’s solution, stained with 
Heidenhain’s hematoxylin, and mounted in 
balsam) is 40 mm in length, with maximum 
width of 4 mm in the greater posterior part, 
with the tapering posterior extremity appreciably 
truncated. In the immature paratypes the scolex 
is of the Bubothrium type in general appear- 
ance, 1.5-2. 5 mm long by 2. 1-3.0 mm wide, 
with a distinct apical disc notched on the 
median margin both dorsally and ventrally; 
each surficial bothrium is elongate oval to el- 
liptical, 1.8 X 1-1 mm, widest at the posterior 
half, with a wide longitudinal median furrow 
tending to deepen posteriorly; its lateral mar- 
gins may be distinctly crenulated. In the type 
the strongly flattened scolex is 3.8 mm long by 
1.5 mm wide, its apical disc is about 1.0 mm 
in transverse diameter, and its median marginal 
notch is hardly recognizable. The neck is dis- 
tinct, about 7 mm long by 1.5 mm wide in the 
type, more or less irregularly corrugated trans- 
versely. Proglottides are short, craspedote, with 
most of the cortex expanded transversely in the 
form of lamellae, 226 in number in the type, 
at the posterior extremity of which the last seg- 
ment is only 0.28 mm long by 1.0 mm wide and 
contains paired, excretory vesicles 0.1 mm wide. 
In an immature paratype this last segment is 
0.45 mm long by 0.7 mm wide, and is oc- 
21 
