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PACIFIC SCIENCE, Vol. XIX, October 1965 
pore, bifurcating into two unequal arms ante- 
riorly at varying levels in esophageal region. 
Nerve commissure with a short anterior and a 
long posterior nerve trunk on each side, about 
0.2 mm from head end in the type. 
DISCUSSION: This genus is characterized by 
the following important features: (1) esophagus 
unusually long and winding; (2) ceca strongly 
convoluted for greater posterior part and run- 
ning in median field rather than in lateral 
fields, atrophied posteriorly and not reaching 
posterior extremity; (3) testes tubular, double, 
obliquely tandem; extending greater part of 
body; (4) genital pore definitely postpharyn- 
geal; (5) ovary single, tubular, unbranched, 
occupying greater middle portion of body; (6) 
uterus proper divided into three portions (prox- 
imal ascending, intermediate descending, and 
distal ascending); (7) no acetabulum. It bears 
a certain resemblance to Metanematobothrioi- 
des, but differs from it notably in all points 
except (5). It is defined as follows. 
Allometanematobothrioides n. gen. 
GENERIC DIAGNOSIS: Didymozoidae, Nema- 
tobothriinae. Body slender, very long, markedly 
tapered anteriorly. Oral sucker rudimentary, 
pharynx well developed. Esophagus long, nar- 
row. Ceca strongly convoluted for their greater 
posterior part, tending to atrophy posteriorly, 
not reaching posterior extremity. Acetabulum 
absent. Testes double, tubular, winding, obliquely 
tandem, occupying greater posterior part of 
body. Genital pore ventromedian, definitely 
postpharyngeal. Ovary single, tubular, un- 
branched, occupying greater middle portion of 
body. Seminal receptacle present. Uterus first 
descending for a short distance, then ascending, 
turning backward in anterior part of body, fi- 
nally turning forward at posterior extremity; 
eggs bean-shaped, small. Vitellarium tubular, 
extending from near posterior extremity to gen- 
ital junction. Excretory vesicle with terminal 
pore, bifurcating anteriorly into two short arms. 
Parasitic, free in tissues of marine teleosts. 
type SPECIES: A. lepidocybii n. sp., in Lepi- 
docybium flav o brunn eum; Hawaii. 
11. Metanematobothrioides opakapaka 
n. gen., n. sp. 
Fig. 11 A-C 
HABITAT: Submental connective tissue, inner 
surface and its opposite surface of operculum 
of Pristipomoides microlepis (local name "opa- 
kapaka”); Hawaii. 
HOLOTYPE: U. S. Nat. Mus. Helm. Coll, S.Y. 
No. 29. 
DESCRIPTION (based on six entire specimens 
and a number of fragments ) : Entire body 
length 32-44 mm in immature specimens, 247 
mm in the longest mature specimen, not com- 
pletely hermaphroditic in young individuals. 
Body slender, slightly flattened dorsoventrally; 
anterior extremity more or less acute. Oral 
sucker terminal, 62-103 X 75-117 /x; pharynx 
28-38 X 30-38 \x. Esophagus simple, 0.35-0.8 
mm long, bifurcating about halfway between 
pharynx and acetabulum. Ceca surrounded by 
gland cells at beginning for a distance of 0.2- 
0.3 mm, terminating at posterior extremity. 
Acetabulum 60-100 /x long by 80-110 \x wide, 
0.8-1. 1 mm from head end. 
Testes paired, tubular, originating at different 
levels, one at posterior extremity and the other 
far away (10-65 mm) from it, terminating at 
a distance of 2.0-4.2 mm from head end. Vas 
deferens running alongside uterus and joining 
metraterm at common opening ventral to oral 
sucker. 
Ovary winding, tubular, 15-43 mm long 
lineally, originating 4.3-10.4 mm from head 
end; distal end of ovary swollen and containing 
numerous yolk cells in the type 127 mm long; 
germiduct may be inflated as it receives the 
duct from the vitelline reservoir and then leads 
into the uterine duct which is lined with a layer 
of epithelia and surrounded by shell gland cells. 
Genital junction very variable in position, di- 
viding body in ratio of 1 : 1-6. No definite sem- 
FlGS. 11-12. 11, Metanematobothrioides opakapaka n. gen., n. sp. 11 A, anterior extremity of holotype, dor- 
sal view. 11B, region of genital junction of holotype, ventral view. 11C, posterior extremity of paratype, lateral 
view. 12, Nematobothrioides kalikali n. gen., n. sp. 12 A, anterior extremity of paratype, ventral view. 12B, 
region of genital junction of holotype, ventral view. 12C, posterior extremity of holotype, ventral view. 
