ON THE FIRST ZOEA OF Cyrtomaia owstoni TERAZAKI(DECAPODA, MAJIDAE) REARED IN THE LABORATORY

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  • オーストンガニCyrtomaia owstoni TERAZAKI(Decapoda, Majidae)初期幼生の形態
  • オーストンガニ Cyrtomaia owstoni TERAZAKI Deca

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The First zoeas obtained from egg beared female of Cyrtomaia owstoni were reared in the laboratory. Three parent crabs trowled from Suruga-Bay,300m depth, off Heda, Shizuoka prefecture on Dec.26, 1983. Among them, one egg beared crab was found 45 days after, and hatching occured 100 days after catching. The first zoea was 2.8mm in length rostrum to dosal spine. Zoeal featurs as follows ; dosal spine comparetively long; antennal exopod ends three forked; endopod of maxillule 2 segmented with bearing 4 teminal plus 2 setae and I setae each: endopod of maxilla beared 4 terminal setae, basal and coxal endite bilobed; endopod of 1st, maxilliped 5 segmented with setation 3-2-1-2-5 and endopod of 2nd. maxilliped 3 segmented with setation 0-1-4. Those features were very similar to C.hispida first zoea reported by WEAR and FIELDER (1985).

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