Early records for the developmental period of the slug egg tend to be unreliable as the environmental conditions are not generally specified. According to Taylor (1902–1907) the eggs of most Limax spp. take about a month to hatch, but rather longer in the case of Limax flavus (40–60 days). Similar periods are required by eggs of A. ater (30–50 days), A. hortensis (20–40 days) and A. intermedins (3 weeks). Eggs of D. reticulatum hatch in three to four weeks while those of the related D. laeve may take longer (20–40 days). Milax gagates eggs hatch in less than a month. Taylor gives no information about environmental conditions except that these hatching times vary with weather conditions. The developmental period for T. haliotidea of 10–12 days is shorter than for other slugs while 20–36 days for T. scutulum and T. maugei is much shorter than the figure of 144–201 days recorded by Barnes and Stokes (1951) for T. scutulum kept in a cellar as near natural conditions as possible. The developmental period of six to eight weeks given by Taylor for Geomalacus maculosus was derived from Simroth in Taylor (1902–1907) and Rogers (1900) and appears to be the only record for this species. The eggs of T. sowerhyi take about four weeks to hatch (Miles et al., 1931).
KeywordsLife Span Developmental Period Digestive Gland Mature Phase Juvenile Phase
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