DEVELOPMENT AND GROWTH IN DOGIELINOTID AMPHIPODS ON SANDY BEACHES IN SOUTHERN HOKKAIDO, JAPAN

Abstract

This paper deals with the development and growth of two dogielinotid amphi-pods in southern Hokkaido, Japan. The early developmental stages of Haustorioides, japonicus and H. munsterhjelmi were observed, and five ~learJy defined stages were regognized within the brood pouch of female by morphological characteristics.' The characteristics of juveniles just after hatching were observed in detail, and compare~ , with those of adult specimens. From these observation, it ,was clear that these juveniles could be identified imme~iatory to the species level. Loss of 'embryos in brood pouch was about 18-41% just before hatching,-and 37-56% just before releace from the brood pouch of H. japonicus. High mortality during early development were observed between stage III and stage IV, and between stage V and stage VI.