Mating behavior in Thalamita picta (Brachyura: Portunidae) and comparisons with congeneric species

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Intermolt (hard shelled) female Thalamita picta, including ovigerous females, were observed to mate in the field and laboratory. Postmolt (soft shelled) stages did not initiate a mating response in males. Copulation in the laboratory lasted an average of 186.1±66.7 seconds (mean±S.D., n = 16) with no significant difference (P>0.1) in duration between pairs with ovigerous and non-ovigerous females. Further, duration of copulation did not differ significantly (P>0.1) between pairs in which the male was larger than the female and those in which the female was larger than the male. For the pre-copulatory maneuvering period (time between capture of the female and the initiation of copulation), although no significant difference was observed between ovigerous and non-ovigerous females (P>0.1), pairs in which the male was smaller than the female (248.6±180.5 sec, n = 9) differed significantly (P<0.05) from pairs in which the male was larger (75.3±39.6 sec, n = 7). Mating behaviors with the congeneric species T. sima and T. prymna are compared and discussed.
日本甲殻類学会の論文