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

Cházaro–Olvera, Sergio; Rocha–Ramírez, Arturo

doi:10.1163/156854007779696442

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The Mexican specimens of P. gracilis (CHÁRAZO-OLVERA & ROCHA-RAMÍREZ 2007) are larger than the Amazonian specimens. The carapace width of specimens from the Amazon was 1.39 ± 0.04 mm and the carapace length was 1.97 ± 0.04 mm, while in Mexican specimens the carapace length and width were 2.20 ± 0.02 mm and 1.57 ± 0.04 mm, respectively.…”

Section: Discussionmentioning

confidence: 84%

“…The appendages were extracted and transferred to another slide where they were stained with a solution of methylene blue 1% (sometimes was used). The terminology used in the descriptions follows POHLE & TELFORD (1981), GUERAO et al (1997), FLORES et al (1998), GARM (2004, and CHÁRAZO-OLVERA & ROCHA RAMÍREZ (2007). The studied specimens were deposited at the crustacean collection of Museu Paraense Emílio Goeldi, under the catalog number MPEG-817.…”

Section: Methodsmentioning

confidence: 99%

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Redescription of megalopa and juvenile development of Pachygrapsus gracilis (Decapoda: Grapsidae) from the Amazon region, reared in the laboratory

Arruda¹,

Abrunhosa²

2011

Zoologia (Curitiba, Impr.)

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Section: Discussionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Redescription of megalopa and juvenile development of Pachygrapsus gracilis (Decapoda: Grapsidae) from the Amazon region, reared in the laboratory

Arruda¹,

Abrunhosa²

2011

Zoologia (Curitiba, Impr.)

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Morphology and growth of the larval stages of Geograpsus lividus (Crustacea, Brachyura), with the descriptions of new larval characters for the Grapsidae and an undescribed setation pattern in extended developments

et al. 2010

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Running head: Morphology and growth of Geograpsus lividus larval stages 2 Cuesta, J. A. et al. 2009. Morphology and growth of the larval stages of Geograpsus lividus (Crustacea, Brachyura), with the descriptions of new larval characters for the Grapsidae and an undescribed setation pattern in extended developments. Acta Zoologica (Stockholm) AbstractAmong the eight currently recognized genera and forty species belonging to the brachyuran crab family Grapsidae (Thoracotremata), the complete larval development is only known for three species of Metopograpsus. In the present study, we investigated the larval development of Geograpsus lividus originating from Jamaica and reared under controlled conditions in the laboratory. It consists of 8 zoeal stages and the megalopa, representing the longest recorded developmental pathway for any brachyuran. Although long developments had been suggested for some species, based on specimens collected from the plankton, these were never confirmed by laboratory culture. In the present study, zoeal growth (measured as increase in body size, dry mass, and contents of carbon, nitrogen and hydrogen) is quantified, and morphological and meristic characters of the larval stages of G. lividus are described and illustrated. The development from hatching to the end of the zoeal phase took two months.During this time span, larval size (cephalothorax length) increased 4.4-fold, while the various measures of biomass increased by factors of 57-72. Morphologically, the larvae present most characters previously established for the family Grapsidae. However, the two last zoeal stages show new features which differ from the typical setation pattern known from grapsid species with only 5 zoeal stages. These were found in the number of natatory setae on the exopods of the maxillipeds, and in the setation of the basis of the first maxilliped. Other characters, which had previously only been described for zoeae of Pachygrapsus and attributed to Planes, were observed also in G. lividus and could be confirmed as common features for the Grapsidae.Moreover, the larvae of G. lividus present a spinulation on the lateral and rostral spines of the 3 cephalotorax. This character is recorded for the first time in grapsid crabs. A comparison of these observations is made with those based on terminal zoeal stages of species belonging to other brachyuran families, where similar characters have been documented.

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Spatio-temporal variation of the population structure and density of the shore crab Pachygrapsus gracilis (Grapsidae) in an estuary on the Brazilian Amazon coast

et al. 2021

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The present study investigates the spatio-temporal variation in the density of the adults and larvae of the shore crab Pachygrapsus gracilis and identifies the reproductive period and the population structure of the species in the Marapanim estuary, in northern Brazil, in order to describe the biological characteristics of this equatorial population on the Atlantic coast. Specimens were collected manually every month over the course of a year. Adults were collected at four rocky outcrops in the upper and lower mid-littoral. Larvae were sampled at six points using horizontal trawls of the surface water. The sampling points represent the inner and outer estuary, its two margins, and varying gradients of salinity. The density of the zoea I and adults were higher on the margins with the highest sediment deposition rates and salinity. Only the density of the adults correlated significantly with salinity. Although ovigerous females were only collected in the rainiest periods, the presence of juveniles throughout the year indicates that the species reproduces continuously. The population parameters indicate that the density of P. gracilis was related to salinity, and that part of the life cycle of these crabs is completed in the Marapanim estuary. This species reproduces in the estuary, exports zoea I to the coastal waters and then probably returns as megalopae, responding to local conditions through systematic shifts in its distribution and abundance over time and space. The population was relatively stable and able to adjust to the considerable variation in abiotic factors that are typical of this estuary.

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

Cited by 3 publications

References 9 publications

Redescription of megalopa and juvenile development of Pachygrapsus gracilis (Decapoda: Grapsidae) from the Amazon region, reared in the laboratory

Redescription of megalopa and juvenile development of Pachygrapsus gracilis (Decapoda: Grapsidae) from the Amazon region, reared in the laboratory

Morphology and growth of the larval stages of Geograpsus lividus (Crustacea, Brachyura), with the descriptions of new larval characters for the Grapsidae and an undescribed setation pattern in extended developments

Spatio-temporal variation of the population structure and density of the shore crab Pachygrapsus gracilis (Grapsidae) in an estuary on the Brazilian Amazon coast

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