Dorjes J 1968 (citation)- p 249-253 description and illustration. Dorjes J 1968 (citation)- on ecology and distribution of in beach at Sylt in Germany, p 112. yearly cycle of etc.- this species studied extensively, see references, also p 87. Ax P 1968 (citation)- on distribution in sand at Sylt. Apelt G 1969 (citation)- p 303 and 313 on early embryology of. Faubel A 1974 (citation)- reports from Sylt - illustration of entire animal. Faubel A 1976 (citation)- in discussion p 38. Faubel A 1976 (citation)- on ecology- moves up and down beach with seasons p 256. on life cycles p 257-8, 328, 353, 8 to 10 generations per year, in beach 257, 279, 283-287, 292, 293, 294, 319, 320. Ax P 1977 (citation)- life cycles in p 13, 16, 17 in table p 14. Fauble A 1977 (citation)- distribution and ecology list p 61 in beach slope p 65-66 and 64 in sand and mud flat, p 65, 67 as a transitional species p 70, 71 - in talbe 1 also and sublittoral p 70. Dorjes J 1979 (citation)- protozoan and mesozoan parasites in. Ehlers U, Doerjes J 1979 (citation)- on abundance of p 69. Watzin MC 1984 (citation)- p 324, notes number of eggs and development from Apelt 1969 (citation).
Notes for the valid (accepted) taxonomic name
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