470 
PACIFIC SCIENCE, Vol. XIX, October 1965 
oval to transversely elongated seminal recepta- 
cle immediately behind. Vitellaria divided into 
six or seven compact lobes, measuring 90-110 
X 130-170 /x as a whole, situated immediately 
anteroventral to ovary, partly overlapping it and 
a little to left of median line. Laurer’s canal? 
Uterus forming transverse loops between vitel- 
laria and acetabulum as well as in front of 
acetabulum, finally opening into genital atrium 
from behind; eggs oval, small, 16-19 X 10- 
12 /x. Excretory vesicle tubular, enlarged to 
form cloaca before opening terminally, divided 
dorsal to vitellaria into lateral collecting vessels, 
each of which runs forward along the lateral 
margin of the body. 
DISCUSSION: As indicated by the name this 
new genus is characterized by the ovary and 
vitellaria being divided into compact lobes and 
lying in the caudal third of the body. From an 
anatomical point of view it bears a more 
marked resemblance to Aerobiotrema Yama- 
guti, 1958 than to any of the other known 
genera, although it is different ecologically. I 
would like to propose a new family Lobatovi- 
telliovariidae with the genus as type, placing it 
near the Aerobiotrematidae. 
LOBATOVITELLIOVARIIDAE n. fam. 
FAMILY DIAGNOSIS: Digenea with large ven- 
tral acetabulum. Body small, tapering toward 
each extremity. Oral sucker and pharynx well 
developed; ceca opening into cloaca. Testes 
symmetrical, lateral, in acetabular zone. Vesic- 
ula seminalis and prostatic complex strongly 
developed. Genital pore midventral, postbifur- 
cal. Ovary and vitellaria lobate, in caudal third 
of body. Uterus forming transversely elongated 
loops, metraterm not differentiated, eggs small, 
operculate. Excretory vesicle Y-shaped in general 
pattern, cloaca well developed. Intestinal para- 
sites of marine fishes. 
TYPE GENUS: Lobatovitelliovarium n. gen. 
Lobatovitelliovarium n. gen. 
GENERIC DIAGNOSIS: Lobatovitelliovariidae. 
Oral sucker subterminal, directly followed by 
pharynx; esophagus short, with bulbous swell- 
ing posteriorly; ceca running dorsal to testes, 
opening into cloaca at posterior extremity. 
Acetabulum much larger than oral sucker, 
largely postequatorial. Testes one on each side 
of acetabulum. Seminal vesicle voluminous, 
pre-acetabular; pars prostatica surrounded by 
dense mass of prostate cells sharply delimited 
from surrounding parenchyma. No hermaphro- 
ditic duct. Genital atrium with sucker-like mid- 
ventral opening behind intestinal bifurcation. 
Ovary divided into four lobes, close to posterior 
extremity. Seminal receptacle immediately post- 
ovarian. Vitellaria consisting of several com- 
pact lobes, immediately anteroventral to ovary. 
Uterus winding just anterior and posterior to 
acetabulum; eggs numerous, small, oval. Excre- 
tory vesicle tubular, narrow, enlarged to form 
wide cloaca at posterior extremity, bifurcating 
behind acetabulum; collecting vessels not unit- 
ing anteriorly. Parasitic in intestine of marine 
teleosts. 
TYPE SPECIES: L. fusiforme n. sp., in Ablen- 
nes hians; Hawaii. 
8. Lobatocystis yaito n. gen., n. sp. 
Fig. 8 
HABITAT: Encysted in pairs in gill arch of 
Euthynnus yaito (local name "kawakawa”) ; 
Hawaii. 
HOLOTYPE: U. S. Nat. Mus. Helm. Col h, S.Y. 
No. 26. 
DESCRIPTION ( based on five whole mounts ) : 
Body flat, approximately triangular, with its 
convex side usually divided into six hemispheri- 
cal lobes, and its flat anterior edge in direct 
contact with the corresponding edge of its 
fellow-occupant of the cyst; the forebody aris- 
ing from this side is pressed flat against the 
flat surface of the hindbody, another rather flat 
side of the hindbody being on the same plane 
as the corresponding side of the other partner, 
so that the two individuals are enclosed in an 
elongated, flattened hemispherical cyst. Fore- 
body scoop-shaped, 1. 5-2.6 mm in length, with 
maximum width of 0.74-1.05 mm at level of 
intestinal bifurcation. Oral sucker prominent, 
0.11-0.16 X 0.12-0.18 mm, directly contigu- 
ous to pharynx, latter 0.14-0.2 X 0.13-0.2 
mm; the two organs appear like a single organ. 
Esophagus slender, 0.2-0. 5 mm long; ceca nar- 
row in forebody, but inflated in hindbody and 
apparently terminating near posterior extremity. 
