Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Utilization and regeneration of seletected appendages of the marine isopod idotea resecata (Stimpson)
Student Author(s): Sameshima, Steven S.
Faculty Advisor(s): Abbott, Donald P.
Pages: 31
Location: Final Papers Biology 175H
Date: June 1973
Keywords: Isopoda
Abstract: The marine isopod Idotea resecata is found on the brown kelp, Macrocystis. The utilization of selected appendages of I. resecata was studied. The second antennae probe the environment and may be used in feeding in conjunction with the first peraeopods. They act as pivot points in righting and in alighting on kelp while swimming. The first peraeopods are used in grooming the second antennae in a manner suggesting a feeding mechanism. They are associated with the mouth parts and are used for locomotion only in compensation behavior. The second, third, and fourth peraeopods are oriented forward. Along with the fifth pair, they are the main ambulatory legs. The first three peraeopods are used for grabbing kelp when the animal is swimming. The last three peraeopods are used for gripping the substrate and are used as water brakes in swumming behavior. They are also used for removing the anterior molt. The uropods direct water flow throught he pleotelson. The pleopods show functional differentiation. The first two pleopods posses hairs and are natatory. The fourth and fifth pleopods are probably used mainly for respiration. The correlation between the rate that the pleopods beat and the rate of heart beat suggest that the pleopods play a role in circulation. Observations on regeneration were done.