Dorjes J 1968 (citation)- p 114 lists as type, p 340-344 description and illustration. Dorjes J 1968 (citation)- on ecololgy of in Germany 87, 94, 98. Apelt G 1969 (citation)- p 304 and 313 on eggs and early development. Faubel A 1974 (citation)- reports from Sylt, illustration of entire animal. Faubel A 1976 (citation)- notes shift in location beach in winter p 256- is continuously sexually ripe; p 257- 8-10 generations per year p 258; life cycle p 353-358; also p 319, 320, 275, 277, 287, 291, 295-298, 256. Faubel A 1977 (citation)- lists p 61, in beach slop p 64-66 in Table 1 in sand-mud flat p 67 found in transition zone p 70. Ax P 1977 (citation)- life cycle in p 17 in table p 14. Ehlers U, Doerjes J 1979 (citation)- on numbers of p 65,66, and 69.
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