鯉に寄生せるDermocystidium屬の一新種

抄録

Dermocystidium koi sp. nov.
This species is found as a parasite; in one case it is parasiting to the integument and in another to the muscle of each separate Cyprinus carpis L.
The specimen of the former was captured at the Yamada Fish Culture Farm (Locality-Yamada Village, Hyogo Pref., Date-July 23, 1940), and that of the latter obtained from the Seto Fish Culture Farm. (Locality-Vicinity of Odawara City, Kanagawa Pref., Date-May 11, 1959). In the case of integumentary parasitim, the parasites grow between the epidermis and the cutis in uarious places of the body surface without scales; and the characteristic lesions a e formed arising from the integument, due to the increase of the parasites and host's tissues such as fibrous connective tissueand blood vessels. (see text-fig. 1 and 2, A, B.) The muscular parasitism occurs when the parasites are parasitic to the scaley host; and in this case the parasites grow in the muscle near the body surface; on the infected parts, the large and hard tumor like inflammatory swelling arise from the increase of the parasites and the same host's tissues as the former.
The parasite is filiform in external character; its transuerse section is round; the diameter 0.04-0.30mm., and it contains innumerable spares.
Spare subspherical, 6-14μ in diameter; the diameter of the large characteristic spherical enclosure is 4.5-10.0μ. The details are compiled in the table 1. The spares are figured in text-fig. 3, NOS. 1-9.
The present species is distinguishable from all other known species, in external form of the parasite or the cyst, the modus parasitic, and the dimension of the spare etc. The lesions may be ruptured naturally in a certa'n period; and the contents fall out from them; and then they seem to be healed gradually. Therefore, the host should not suffer great influence from the parasite. But the histological reactions of the host are marked, which are chiefly proliferocis inflammation, rarely accompanied with phagocytosis. (Text.-fig. 3, No. 10).