日本産鉤頭蟲類の數種に就て
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概要
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1. Filisoma japonicum N. sp. Body cylindrical, 11.5-12.5mm long, 0.93mm wide at the point 5mm caudad from the cephalic end and posteriorly tapers abruptly, the slender end being 0.42mm wide. Body without spines. Proboscis cylindrical, long ad slender. Size 0.64×0.1mm. Hooks of the proboscis in 1-12 rows, 25 hooks in each row. The length of the 10 anterior hooks 33.34-37.78 μ, and that of the 17 posterior ones 20.0-1.2, the last ones the smallest. Proboscis sheath 0.79mm long, 0.15mm wide, double walled, Ganglion ellipsoidal, situated at the posterior end of the sheath, 0.19mm long and 0.05mm wide. Retinacula paired. Lemnisci very long, club-shaped, 1.79mm long and 0.13mm wide. Ovary spherical or ellipsoidal in shape, 0.15mm long and 0.19mm wide, arranged along the ligament. Genital pore terminal, slightly turned ventral. Without papillae around the genital pore. Material. 2 females. Host. Hexagrammos otakii (a kind of marine fish): intestine. Locality. Aichi Prefecture. March 1936. This species closely resembles F. indicum VAN CLEAVE, but body is much smaller, lemnisci are very long and the host fish is marine. These points are sufficient to distinguish this from F. indicum. 2. Porrorchis ogatai n. sp. Body spindle-shaped. Size 4.9×1.1mm in type male and 8×1.76mm in type female. 4.6×1.0mm in a female without eggs. Body without spines. Neck short, without spines. Proboscis cylindrical, the anterior end slender and rounded, 0.64-0.77mm long and 0.19-0.23mm wide. Hooks of the proboscis in 18 rows, 14-15 hooks in each row. The length of the middle hooks 70.21 μ, that of the anterior and the posterior ones 51.06-63083 μ. The size of the proboscis sheath 1.53-1.66×0.26-0.38mm. The wall double and the ganglion situated in the middle. Size of the ganglion 0.19×0.08mm. Lemnisci paired, slender, posterior part somewhat moniliform. Size 2.17×0.12mm. Testes ellipsoidal, arranged tandem. The anterior testis overlapped with proboscis sheath, and larger than the posterior one. cement glands 4 in number, cylindrical, very long, the anterior ends being very close to the posterior testis. Eggs: Size 66.67×25.53 μ. The middle shell without polar swellings. Material. 2 females and 1 male. Host. Merula pallida (a kind of bird): intestine. Licality. Chiba Prefecture. May 1936. This species belongs Porrorchis FUKUI, 1929 and resembles the only species P. elongatus FUKUI, but the body is markedly small, proboscis cylindrical, rows of hooks few, testes not widely separated each other. These points are enough to separate this species from the latter. We dedicate this to the collector Mr.T.OGATA.
- 1936-10-15
著者
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