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Morphology of the Pachygrapsus gracilis (De Saussure, 1858) megalopa (Brachyura, Grapsidae) reared in the laboratory

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[This study describes the morphology of the megalopa stage of Pachygrapsus gracilis in detail and compares it with that of other species collected in the Camaronera Lagoon inlet of the Alvarado Lagoon system, Veracruz, Mexico. The biological material was collected with a conical net (1.0 m length, 0.75 m width, 243 μm mesh opening). Rearing was conducted in a vertical re-circulating system. We find that the numbers and types of setae to differentiate the megalopa of P. gracilis are on the following structures: antennula, basal and coxal endite of the maxillule, basal endite and scaphognathite of the maxilla, protopodite and epipodite of the first maxilliped, fifth segment of the endopod of the second maxilliped, fourth and fifth segment of the endopod and the epipodite of the third maxilliped, and the number of setae of the pleopods. The P. gracilis megalopa has the largest-sized carapace of all the megalopae of the crab species of the Camaronera lagoon inlet. En este estudio se realizó la descripción morfológica de la megalopa de Pachygrapsus gracilis y se comparó con otras especies colectadas en la boca de la laguna Camaronera del Sistema Lagunar de Alvarado, Veracruz, México. El material biológico fue colectado con una red cónica (1.0 m de longitud, 0.75 m de ancho y 243 μm de abertura de malla). El cultivo se realizó en un sistema de re-circulación vertical. Nosotros encontramos que el número y tipo de setas para diferenciar a la megalopa de P. gracilis están sobre las siguientes estructuras: anténula, endito basal y endito coxal de la maxílula, endito basal y escafognatito de la maxila, protopodito y epipodito del primer maxilípedo, quinto segmento del endópodo del segundo maxilípedo, cuarto y quinto segmento del endópodo y el epipodito del tercer maxilípedo y el número de setas de los pleópodos. P. gracilis presentó la talla más grande respecto a otras especies colectadas en la boca de la laguna Camaronera., This study describes the morphology of the megalopa stage of Pachygrapsus gracilis in detail and compares it with that of other species collected in the Camaronera Lagoon inlet of the Alvarado Lagoon system, Veracruz, Mexico. The biological material was collected with a conical net (1.0 m length, 0.75 m width, 243 μm mesh opening). Rearing was conducted in a vertical re-circulating system. We find that the numbers and types of setae to differentiate the megalopa of P. gracilis are on the following structures: antennula, basal and coxal endite of the maxillule, basal endite and scaphognathite of the maxilla, protopodite and epipodite of the first maxilliped, fifth segment of the endopod of the second maxilliped, fourth and fifth segment of the endopod and the epipodite of the third maxilliped, and the number of setae of the pleopods. The P. gracilis megalopa has the largest-sized carapace of all the megalopae of the crab species of the Camaronera lagoon inlet. En este estudio se realizó la descripción morfológica de la megalopa de Pachygrapsus gracilis y se comparó con otras especies colectadas en la boca de la laguna Camaronera del Sistema Lagunar de Alvarado, Veracruz, México. El material biológico fue colectado con una red cónica (1.0 m de longitud, 0.75 m de ancho y 243 μm de abertura de malla). El cultivo se realizó en un sistema de re-circulación vertical. Nosotros encontramos que el número y tipo de setas para diferenciar a la megalopa de P. gracilis están sobre las siguientes estructuras: anténula, endito basal y endito coxal de la maxílula, endito basal y escafognatito de la maxila, protopodito y epipodito del primer maxilípedo, quinto segmento del endópodo del segundo maxilípedo, cuarto y quinto segmento del endópodo y el epipodito del tercer maxilípedo y el número de setas de los pleópodos. P. gracilis presentó la talla más grande respecto a otras especies colectadas en la boca de la laguna Camaronera.]

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/content/journals/10.1163/156854007779696442
2007-01-01
2016-08-24

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