樺太産馴鹿の咽頭腔に寄生せるCephenomyia trompe MODEERの幼蟲に就きて
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概要
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In July 1912 Prof. OGURA K. found seven larvae belonging to Oestridae in the pharyngeal cavity of the Karafuto reindeer, and directed me to determine the species of the same. Comparing these larvae with those of Cephenomyia, studied by BERGMAN, HADWER, MODEER, BAU and others, it was proved that they were the third stage larvae of the Cephenomyia trompe. Together with the larva of Oedemagena tarandi LINNAEUS, previously detected by the author (1) in the subcutaneous connective tissue of the Saghalien reindeer, the present larva is awfully injurious to the reindeer, and, in Japan, both were first found by us. A description on the morphological characteristcs of this larva is as follows: 1.The body is cylindrical in form (29mm×8mm), yellowish white in color, and has eleven segments. With the exception of the dorsal surface of the first segment, sharp spines appear in rows upon both ventral and dorsal surfaces of all the segments (Fig.1, 2). As shown in Fig. 4 and 5, it is possible to differentiate the ventral surface from the dorsal by the lateral line, and we are also able to distinguish clearly the first and second segment of the Cephenomyia trompe. 2.The first segment specifically has no spines upon its dorsal aurface. There, however, are many markings of a blackish color in the form of Patella toreuma (0.08mm-0.18mm), and as BERGMAN states, this first segment is almost square in shape (0.3mm×0.3mm). 3.On both sides of the boundary line between the first and the second segment, on the dorsal face, there are small brownish yellow spiracles (0.15mm×0.1mm). 4.In the middle of the ventral surface of the first segment are two mouthhooks (1.1mm×0.15mm), brownish black in color, and bent to right and left. Above these, there are thick antennae, milky in color. At the base, each mouth-hook and its corresponding antenna are united (Fig.3). Behind the antennae, there is a slight fleshy process. Around this process and mouthhooks are found numerous spines. Sometimes this process is mistaken for the ventral surface of the first segment, but as the lateral line in Fig.4 shows, it is possible to distinguish them clearly. That is, Fig.4 shows nothing more than the ventral view of the process of the first segment. 5.In addition, on both sides of the dorsal surface of segments 4 to 8, there are several short spines (Fig.1). 6.On the ventral surface of segments 4 to 10, there are each two tubercles (Fig.2, 3), in shape of melon seed (1mm×0.5mm). 7.On the dorsal surface of the 11th segment, there is a stigmatic cavity, within which are two stigmal (reniform) plates (1mm×0.8). There are black in color, and are bordered with a slightly waving line. In closing, I wish to express my deep respect for Prof. OGURA K. and my warm gratitude to Prof. ICHIKAWA K. for his obliging guidance in this study.
- 1927-02-15