Dorjes J 1968 (citation)- p 193-198, long description and good illustration. Dorjes J 1968 (citation)- on ecology of in Germany p 98 and 94. Rieger RM, Tyler S 1974 (citation)- notes caudal type at posterior end. Ehlers U, Doerjes J 1979 (citation)- in comparisons p 25. Faubel A 1977 (citation)- on distribution and ecology. lists p 62 in mud and sandy mud and beach slopes p 66, 68. Hellwig M 1987 (citation)- ecology.
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