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T. mutabilis. Histological sections of the gonads of small (≤20 mm) male and female specimens. (a to d): female with increasing shell length (a 10 mm, b 14 mm, c 16 mm, d 18 mm) (e to h), male with increasing shell length (e 13 mm, f 14 mm, g 16 mm, h 17 mm). Dg Digestive gland, Gon Gonads. nu nucleoli (two or three nucleoli are visible in (a) a 10 mm female), Sz Mature Spermatozoa. Scale bars = 100μm.
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