New Monogenetic Trematodes from Hawaiian Fishes, I 1 
Satyu Yamaguti 
The present report is based on the collec- 
tions made by my technical assistant, Mr. Shunya 
Kamegai, in 1963. The source of material was 
chiefly from the Honolulu Fish Market, and 
partly from the University Aquarium at Waikiki 
Beach. I am particularly indebted to the director 
of the Aquarium, Prof. S. W. Tinker, for his sup- 
ply of frozen fish material from which my first 
collections of monogenetic forms were made. I 
wish to express my appreciation also to Prof. 
W. A. Gosline, Department of Zoology, Univer- 
sity of Hawaii, who identified the fish; Prof. 
G. W. Chu, Department of Microbiology, for his 
official sponsorship on behalf of the University 
of Hawaii; Mr. S. Kamegai for collecting para- 
sites and drafting the figures of the parasites; 
and Mrs. S. Yamaguti for finishing the figures, 
preparing the plates, and typing the manuscript. 
The monogenetic trematodes of the Hawaiian 
fishes have so far remained unexplored, so that 
special attention was directed to this group of 
trematodes. It is surprising that Hawaiian fishes 
are very commonly infested with monogenetic 
trematodes and that the parasites so far ex- 
amined are all, with some exceptions, new to 
science. It will take, therefore, a long series of 
years to report all the findings. For this reason I 
have decided to report here only those new 
species representing new genera, before describ- 
ing the large numbers of species which remain 
to be published in a later monograph. Some of 
the new genera represent new subfamilies, or 
even new families, as indicated in the list given 
below. The holotype specimens and some of the 
paratypes mounted on the same slides as the 
holotype will be deposited in the Helmintho- 
logical Collection of the United States National 
Museum at Beltsville, Maryland, and the para- 
types will be deposited along with described 
species in the Meguro Parasitological Museum in 
1 Contribution from Department of Microbiology, 
University of Hawaii, supported by a grant (GB- 78 ) 
from the National Science Foundation. Manuscript 
received April 25, 1963. 
Meguro, Tokyo, where I shall be in active re- 
search service after completing my research 
project in the United States. 
The new genera described below are assigned 
to different families as follows: 
I. CAPSALIDAE Baird, 1853 
Benedeniinae Johnston, 1931 
1. Dioncopseudobenedenia kola n. g., n. 
sp.^ 
2. Oligoncobenedenia nasonis n. g., n. sp. 
Pseudonitzschiinae n. subf. 
3. Pseudonitzschia uku n. g., n. sp. 
II. MONOCOTYLIDAE Taschenberg, 1879 
Monocotylinae Gamble, 1896 
4. Diploheterocotyla dasyatis n. g., n. sp. 
III. DACTYLOGYRIDAE Bychowsky, 1933 
Ancyrocephalinae Bychowsky, 1937 
5. Neohaliotrema mao mao n. g., n. sp. 
6. Pseudempleurosoma carangis n. g., n. 
sp. 
IV. DIPLECTANIDAE Bychowsky, 1957 
7. N asobranchitrema pacificum n. g., n. 
sp. 
V PSEUDODICLIDOPHORIDAE n. fam. 
Pseudodiclidophorinae n. subf. 
8. Pseudodiclidophora decapteri n. g., n. 
sp. 
Allopseudodiclidophorinae n. subf. 
9. Allopseudodiclidophora opelu n. g., 
n. sp. 
VI. DISCOCOTYLIDAE Price, 1936 
Opisthogyninae Unnithan, 1962 
10. Pseudopisthogyne lepidocybii n. g., 
n. sp. 
11. Allopseudopisthogyne constricta n. 
g, n. sp. 
12. P seudopistho gynopsis lepidocybii n. 
g, n. sp. 
Pseudodiscocotylinae n. subf. 
13. Pseudodiscocotyla opakapaka n. g., 
n. sp. 
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