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Marsupial Developmental Stages in Americamysis bahia (Mysida: Mysidae)

Jennifer L. Wortham-Neal and W. Wayne Price
Journal of Crustacean Biology
Vol. 22, No. 1 (Feb., 2002), pp. 98-112
Published by: on behalf of The Crustacean Society
Stable URL: http://www.jstor.org/stable/1549611
Page Count: 15
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Marsupial Developmental Stages in Americamysis bahia (Mysida: Mysidae)
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Abstract

The marsupial development of a population of Americamysis (= Mysidopsis) bahia from the Gulf of Mexico was examined at 16°C, 20°C, and 29°C from oviposition to the juvenile stage. Three phases of development, divided into five stages, occurred during in vitro culture of larvae. The embryonic phase (Stage 1) is spherical and surrounded by the egg membrane. The nauplioid phase begins with hatching from the egg membrane and consists of an early (Stage 2) and late (Stage 3) stage. The early nauplioid stage, which is divided into three substages, elongates into a comma-shaped larva and ends with the appearance of thoracic chromatophores. Stage 3 begins with the formation of eye pigment and ends with the shedding of the naupliar cuticle. The subsequent postnauplioid phase has two stages. Stage 4 is characterized by the formation of a yolk protuberance anterodorsal to the carapace. Stage 5 begins with enclosure of the yolk in the carapace and ends with release of the larvae from the marsupium and a molt to the juvenile stage. Following liberation of young at night, the female molts, and usually mates and extrudes another brood of eggs. Survival rates of A. bahia larvae in vitro increased with age and with decreasing temperature. Average brood durations of larvae were 15.5 days at 16°C, 10.4 days at 20°C, and 4.6 days at 29°C. Observations of brood release, spatial organization within the marsupium, and adoption of larvae are discussed.

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