著者
川本 信之 三上 進
出版者
日本貝類学会
雑誌
貝類学雑誌 (ISSN:00423580)
巻号頁・発行日
vol.37, no.4, pp.230-239, 1978-11-30 (Released:2018-01-31)

It is reported that the Nautilus makes a diel vertical migration from a depth of about 500 m up to the near-surface of the sea. However, it is axiomatic that such a long-ranged migration within a short period of the time cannot be managed by only water-jet propulsion through the hyponome. There has been a number of early works for elucidating how the animal is possible to make this migration, but no satisfactory solution has been obtained so far. Through an anatomical observation on muscle part of Nautilus macromphalus, we could speculate that two major retractors, namely, funnel and cephalic, may be involved in downward migration. Our hypothesis is that the contraction of these two retracting muscle will create a pressure in a sea water intaken in the mantle cavity and this pressure may be transmitted (through unknown mechanism) to the siphuncle. If so, the gas contained in other chamber could be compressed and makes the specific gravity of animal increased.

言及状況

外部データベース (DOI)

Twitter (5 users, 5 posts, 12 favorites)

https://t.co/lslweb9891 飼育していたオウムガイの遺体を解剖した研究を拝見。軟体部と貝殻はあまり繋がっていないとの事。アンモナイトとは違うようです。殻の蓋をぎゅっと閉めた状態で死亡したようです。この時私の推測… https://t.co/oqPbLjG1Js

収集済み URL リスト