Riedl RJ 1959 (citation)- p 186-200, complete and full description, illustration, etc.- two examples only, littoral of Mediterranean. "body slender and tubular, length 0.5-1mm, anterior end blunt, posterior end rounded, opaque whitish, unpigmented, with large, glassy highly characteristically shaped concremets in the spaces of the basal part of outside body layer- The outer layer of the body covering is granular, with glands, without rhabdites and with short cilia- with paired, spherical shell glands laterally and compact black brown pigmented eye spots dorso caudally to the brain- Protandrically hermaphroditic- Marine." Ax P 1961 (citation)- note on pharynx of, illustration of, ovatestis in. Ax P 1963 (citation)- p 204, notes "typical hermaphroditic gonad" in. Sterrer W, Rieger RM 1974 (citation)- refers to Tyrrheniella sigillata compared to his Retronectes p 630, p 75 Rieger RM, Sterrer W 1975 (citation)- on spicules in, table 2, p 260, description p 252-3.
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