Skinner, Ernest B. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XIV, Part I (1902)
Marshall, W. S.
Entocythere cambaria (nov. gen. et nov. spec.), a parasitic Ostracod, pp. -Plate XIII ff.
ENTOCYTHERE CAMBARIA (nov. gen. et nov. spec.), A PARASITIC OSTRACOD. BY WM. S. MARSHALL, Assistant Professor of Zoology. University of Wisconsin. While examining a number of branchiae taken from recently killed crayfish, I noticed on one of them a small crustacean, which upon examination with a microscope', proved to be an Ostracod. The peculiarity of its habitat at once struck me as anomalous, and desiring to procure more specimens, I adopted the following method which I found very satisfactory. When any specimens of the Ostracod were wanted a crayfish was killed, the branchiae removed and placed in a large watch-glass partially filled with water. The Contents of this glass being examined a few minutes later, the Ostracods, if present, were found near the edge of the water at the side farthest from the light, to which they appear very sensitive. As soon as the branchiae were placed in the water the parasites would leave themN and reaching the glass would crawl along it until they came to the edge of the water, where they would remain as far from the source of light as possible. The first crayfish (different species of Cainbarus) examined were from, the vicinity of [adison; of these, nearly half were infected. Other cravfish were obtained through a dealer and varied considerably in their infection; some localities yielding nearly as high a percentage as those near Madison, while cray- fish from other localities appeared to be entirely free. The dealer obtained this material from different parts of Wiscon- sin, but I could get no definite locality other than Madison. At no season of the year were the parasites entirely absent although
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