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Table 1 Maturity stage assessment definitions for male and female whelk using visual assessment methods.

From: Timing of the reproductive cycle of waved whelk, Buccinum undatum, on the U.S. Mid-Atlantic Bight

StageMaleFemaleMature
Immature (I)No obvious differentiation between digestive gland and gonad (testis). Vas deferens invisibleNo obvious differentiation between digestive gland and gonad (ovary)0
Developing (II)Some visible differentiation between the anterior edge of digestive gland and gonad (testis), possibly a visible vas deferensSome visible differentiation between the anterior edge of digestive gland and gonad (ovary), possibly a visible pallial oviduct1
Mature (III)Full differentiation between digestive gland and gonad (testis) obvious, visible vas deferens in malesFully differentiation between digestive gland and gonad (ovary), visible enlarged pallial oviduct1