Nuttycombe JW 1931 (citation)- Marcus E 1945 (citation)- illustration and description from Brazil. Marcus E 1945 (citation)- gives cross section, figure 22, details discussing in many places. Marcus E 1946 (citation)- p 123 mentions. Correa DD 1949 (citation)- mentions digestion in p 188. Kolasa J 1977 (citation)- gives first record of this from Poland.
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