Studies on the Helminth Fauna of Kyushu Part 3. Three species of Hymenolepididae cestodes from anserine birds in Oita Prefecture (With 2 Plates)

奈良教育大学学術リポジトリNEAR

Studies on the Helminth Fauna of Kyushu Part 3. Three species of Hymenolepididae cestodes from anserine birds in Oita Prefecture (With 2 Plates)

著者 SAWADA Isamu, KUGI Giiti journal or

publication title

奈良教育大学紀要. 自然科学

volume 24

number 2

page range 5‑11

year 1975‑11‑15

URL http://hdl.handle.net/10105/2576

Bull. Nara Univ. Educ, Vol. 24, No. 2, (cult. & soc.) 1975

Studies on the Helminth Fauna of Kyushu

Part 3. Three species of Hymenolepididae cestodes

from anserine birds in Oita Prefecture (With 2 Plates)

Isamu SAWADA

(Biological Laboratory, Nara University of Education, Nara 630, Japan) and

Giiti KUGI

(Beppu City, Oita 874, Japan)

(Received March 22, 1975)

Abstract

Hymenolepis ( Weinlandia) tenuicollis n. sp., Haploparaxis japonensis Yamaguti, 1935 and Fimbriaria fasciolaris (Pallas, 1781) from mallard, Anas platyrhynchos platyrhyn- chos, are described. The present species closely resembles Hymenolepis looodshole.i Fuhrmann, 1932, but it differs from the latter in the shape of rostellar hooks and in the arrangement of testes.

Three species of mallards, Anas platyrhynchos platyrhynchos, were collected by

Kugi at Koganohara, Beppu City on November 8, 1973. After each mallard was killed,

it was dissected for internal study. The small intestines were opened in saline solu-

tion and with the use of a dissecting microscope, a thorough examination of the int-

estinal wall followed. All mallards harbored cestodes. These cestodes were fixed in

5 per cent formaline and they were placed between the two slide glasses and pressed

enough so as to make them as flat and thin as possible, and then stained with Heiden-

hain's hematoxylin. As the result of investigation, the present specimens have been

identified with Haploparaxis japonensis, Fimbriaria fasciolaris and a new species be-

longing to the genus Hymenolepis. All measurements are given in millimeters.

Hymenoleqis (Weinlandia) tenuicollis n. sp.

The length of the specimens is 70 to 82 and themaximum width 1.5to 1.8. Thesco-

lexis 0.21 long and 0.21 to 0.27 wide, The invaginated rostellum measures 0. 168 long

and 0.070 wide; the rostellar sac is 0.196 long. The rostellum carries ten hooks

which have a shape like figure 2, Plate 1 and which are 0.039 in length; the guard

is prominent but shorter than the blade. The unarmed suckers are rounded and have

5

6 Isamu SAWADAand Giiti KUGI

a diameter of 0.091 to 0.112. The tenuous neck measures 0.07 long and 0.13 wide.

Segmentation begins at immediately behind the scolex. The genital pores are unilateral

and situated in the anterior half of each segment margin. The genital ducts pass dor-

sally to the excretory canals. The cirrus sac is elongate and runs along the anterior

margin of the segment to the middle line. It measures up to 0.567 long and 0.138 to

0.152 wide and an invaginated cirrus is armed with very fine spines. The external

and internal seminal vesicles are extremely prominent; the former is transversely

oval, measuring 0.304 by 0.180 to 0.194 and the latter is pretty small, measuring

0.207 by 0.152 to 0.156. The three testes are arranged in a triangular position; two

of the testes are on the aporal side of the median line, one lying in the poral of the

segment. The testes, when fully developed, are transversely oval, measuring 0.138 to

0.180 by 0.235 to 0.249. The vagina is armed with the accessory sac-like terminal

swelling. At its proximal end the vagina expands into a large seminal receptacle. It is

usually transversely oval and measures 0. 138 by 0.097. The ovary lies ventrally to

the testes. In the early stage of its development it is more or less triangular in out-

line, but as development proceeds it expands laterally on both sides. When fully deve-

loped, the ovary measures 0.498 to 0.539 wide, and its margins are slightly lobed.

The vitelline gland is triangular or sub-globular, measuring 0.083 to 0.111 by 0.069

and situated in the middle line of the segment. In gravid segments the uterus is sac-

cate, and extend laterally beyonds the excretory canals. The mature eggs are rounded,

measuring 0.070 to 0.088 in diameter, while the onchospheres are 0.021 in diameter.

The embryonic hooks are about 0.007 long.

Discussion

Under the species for the reception of hymenolepids having the vagina with armed

the accessory sac-like terminal swelling, as far as can be assertained from the written

description, about 12 species are recorded.

In comparing the present new species with the 12 species, it closely resembles

Hymenolepis woodsholei Fuhrmann, 1932 from Colymbus auritus, C. holbelli and C.

grisegena. But, it is easily distinguished from H. woodsholei in the shape of rostellar

hooks and in the arrangement of testes.

Host : Anas platyrhynchos platyrhynchos Habitat : Small intestine

Locality and date : Koganohara, Beppu City, Oita Prefecture; November 8, 1973

Type depository : Biological Laboratory, Nara University of Education, Nara, Japan

Haploparaxis japonensis Yamaguti, 1935

Strobila length 150 to 168 in length and 1.6 to 2.1 in width. Scolex 0.42 long and

Studies on the Helminth Fauna of Kyushu '

0.315 to 0.326 wide; rostellum well developed, 0.182 by 0.133 and rostellar sac 0.392

in length, Rostellum armed with a single of 10 hooks, 0.060 long. Neck very slender,

0.210 long and 0.098 wide. Genital pores unilateral, located at anterior part of middle

of proglottid margin. Testis one in number, measuring 0.084 to 0.098 by 0.063. Ovary

0.056 to 0.070 by 9.035 to 0.016. Vitelline gland located in middle line of segment,

0.053 by 0.066 to 0.070. Seminal vesicle prominent, sub-globular, measuring 0.056 by

0.056 to 0.063.

F/mbr/ar/a fasciolaris (Pallas, 1781)

Strobila length 150 to 250; greatest width 3.2 to 5.4. Scolex very small, 0.158 to

0.175 long and 0. 112 wide and pseudoscolex well developed, containing no genitalpri-

mordia. Sucker round, 0.035 by 0.046. Rostellum 0.105 long and 0.053 wide.Rostellum

armed with a single of 10 hooks, 0.021 length. External segmentation lacking and in-

ternal segmentation obscure. Onchosphere 0.018 to 0.021 in diameter.

References

Fuhrmann, 0. 1932 Les Tenias des oiseaux. Memories de 1'University de Neuchatel.

8 ; 381pp.

Hughes, R. C. 1940 The genus Hymenolepis Weinlandia, 1858. Oklahoma Agr.Exp.

Sta.Tech.Bull. 8 : 1-42.

Hughes, R. C. 1941 A key to the species of tapeworms in Hymenolepis. Trans. Amer.

Micro. Soc. 60 : 378-414.

Linton, E.1927 Notes on cestode parasites of birds. Proc. U. S. Nat. Mus. 70: 1-73.

Spassky, A. A., and L. P.Spasskaya. 1954 Systematic structure of the hymenolepids

parasitic birds.(Russian text). Trudy Gem. lab., Akad. Nauk SSSR. 7 : 55-119.

Spassky, A.A. 1963 Hymenolepididae tapeworms of wild and domestic birds.(Russian

text). Academy Sci. USSR. Vol. 2., 418 pp. Moscow.

Yamaguti, S. 1935 Studies on the helminth fauna of Japan. Part 6. Cestodes of birds

1. Jap.J.Zool. 6:183-232.

1955. Systema Helminthum. Vol. ll. The cestodes of vertebrates.

New York.

Isamu SAWADA and Giit; KUGI

Plate I. Figs. 1-10. Hymenolepis (Weinlandia) tenuicollis n. sp.

1. Scolex (x80)

2. Rostellar hooks (x580)

3. Early immature segments (x65)

4. Immature segments (x65)

5. Mature segments (x65)

6. Gravid segments (x65)

7. Cirrus sac and seminal receptacle (xl40)

8. Genital organ system (xl20)

9. Senile segments (x50)

10. Egg containing onchosphere (x750)

10 Isamu SAWADA and Giiti KUGI

Plate II. Figs. 1-4. Haploparaxis japonensis.

1. Scolex (XHO)

2. Mature segments (x50)

3. Early gravid segments (x40)

4. Senile segments (x50) S

Figs. 5-9. Fimbriaria fasciolaris

5. Pseudoscolex (xl3)

6. Scolex (x270)

7. Rostellar hooks (xlOOO)

8. Immature segments (x30)

9. Mature segments (xl8)