Distribution of Polychaetous Annelid Worms from Ulnung-do Coast

울릉도 연안의 갯지렁이류 분포

Distributional patterns of Ulnung-do's Polychaetous annelid worms comprising 64 species out of 53 genera were divided into four zoogeographical groups with reference to the distribution of the world's polychaetous annelid worms; cosmopolitan, northern, temperate and tropical types. It was found out that there were 25 species of cosmopolitan type taking up $39\%$, 20 species of northern type, $31\%$, and 19 species of temperate type, $30\%$, but tropical type was not found. When compared with the polychaetous annelid worms of the neighboring coastal areas of the Yellow Sea, the east coast of U.S.S.R., Korea and Japan, those of Ulnung-do island were shown to have highest similarity to those of Yellow Sea follwed by the areas in the order named.

울릉도산 갯지렁이류 총 25과 53속 64종을 1) 갯지렁이의 세계적 분포를 참고로 범세계종, 북방종, 온대종 및 남방종의 4분포형으로 나누었다. 2) 범세계형이 25종으로 $39\%$였고, 북방형이 20종으로 $31\%$이고, 온대형이 19종으로 $30\%$의 순으로 나타나고 남방형은 출현되지 않았다. 3) 인접해역인 한국, 일본, 소련의 동해안 및 황해의 갯지렁이상과 비교한 결과 그 유사도는 일본${\cdot}$한국 소련 및 황해의 순이었다.