Two Neanurid Species of Collembola (Insecta) from Korea with Polytene Chromosomes in Salivary Glands

唾腺에 巨大多絲染色體를 갖는 韓國産 혹무늬톡톡이 (곤충강) 2種의 報告

Two Neanurid species of Collembola, Lobella minuta n. sp., and Morulina triverrucosa Tanaka, 1978 were identified from collections of South-Western part of Korea. They were, in addition, confirmed to be genera of new record to the country. From their common structure of simple mouth parts it was postulated that they may have both hypertrophy and polytene development of salivary glands in the light of early evidences by Cassagnau. These assumptions were tested for the above two Korean species using cytological and histological techniques. The results of the investigations have proved to be positive for the postulations, thus supporting hypothetical correlations of simple mouth parts with polytene development, irrespective of taxa, not limited to Neanurini as indicated in early works. However the structurization of the polytene chromosomes was shown of different extent between the two, i.e., in Lobella minuta, clearly more differentiated than in Morulina triverrucosa in spite of the strong similarity of mouth parts, which are to be seen as a distinct convergence from two tribes, Neanurini and Morulini. It remains to be studied consequently to know whether there as any factor other than mouth part structure affecting polytene development and also if the parallelism among a few different taxa of mouth parts would be the case with polytene development of salivary glands either.

전북의 수개 산지에서 채집된 혹무늬톡톡이 가운이 한국 미기록속으로 Lobella minuta n.sp.가 신종으로 확인되었기에 이를 기재, 보고한다. 또한 한국 미기록속, 미기록종으로 이미 그의 타선염색체에 관해 보고된 바 있는 (Lee, 1980) Morulina triverrucosa Tanaka, 1978의 한국산 표본에 대해 추가 기재한다. 저자는 위 신종의 구기가 매우 단순화되어 있음을 관찰하고 Cassagnau의 보고 (1966$\\sim$1978)에 비춰 타선의 비대화와 거대다사염색체의 발달 가능성을 추정하게 되었고 이를 검증하기 위해 세포 및 조직학적 조사를 시행한 바 위의 추정이 사실임이 확인되었으므로 그 결과를 발표한다.