Abstract
Benthic morphotypes with an organic shell of unknown systematic affiliation are constantly registered in the bottom sediments of deep-water hydrogen sulfide zone of the Black Sea. The work offers a brief description with illustrations of these morphotypes, which are identified as “Form 3,” “Form 4,” “Form 5,” “Form 6,” and “Form 11.” Hypotheses are proposed concerning their origin. In addition, this paper gives an opinion on the unexplained role of the morphotype accumulations in the formation of deep-sea sediments and the importance of these objects in sedimentology and micropaleontology. The use of the accepted term azoic or lifeless is discussed in relation to the hydrogen sulfide zone of the Black Sea.
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