Über die bei einigen Avertebraten vorkommenden antirachitischen Provitamine

Abstract

The content of provitamin in the sterols of the invertebrates is considerably higher than in the mammalia. The provit. in the sterols of Lumbricus terrestris (22.8%) and Arion empiricorum (19-25%) is identical with ergosterol; the same is probably true for Helix pomatia (19-25%). Arion empiricorum is able to store the provit. for over half a yr. The provit. in Buccinum undatum (17-27%) is not ergosterol (as in the other mollusca), but was identified as 7-dehydro-cholesterol. This may be due to the different living conditions of the snail.