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

Arruda, Danielle Cristina Bulhões; Abrunhosa, Fernando Araújo

doi:10.1590/s1984-46702011000400008

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…In an Amazon estuary, P. gracilis and other brachyurans (principally ocypodids and grapsoids) suffer high rates of predation by the Pemecou sea catfish Sciades herzbergii (Bloch, 1794), known locally as the guribu, which uses Amazonian mangroves as nurseries and feeds predominantly on brachyurans throughout its life cycle (Giarrizzo and Saint-Paul, 2008). The available data on P. gracilis include studies of the development of its larvae (Ingle, 1987;Brossi-Garcia and Rodrigues, 1993), megalopae juveniles (Arruda and Abrunhosa, 2011), megalopal transport mechanisms , the abundance of the larvae (Vieira, 2006), the production of spermatophores and seminal fluid (Tiseo et al, 2014;, hull fouling (Cuesta et al, 2016) and general occurrence records (Hartnoll, 1965;Powers, 1977;Coelho and Ramos-Porto, 1980;Melo, 1996;Almeida and Coelho, 2008;Melo, 2008;Gain et al, 2017;Briones-Fourzan et al, 2020).…”

Section: Spatio-temporal Variation Of Pachygrapsus Gracilismentioning

confidence: 99%

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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Section: Spatio-temporal Variation Of Pachygrapsus Gracilismentioning

confidence: 99%

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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“…In addition, the decapods of the Brazilian state of Pará have been the subject of a relatively small proportion of these studies, despite the fact that the region they inhabit is a large aquatic ecosystems with an abundant and diverse decapod fauna (but see CINTRA et al 2003a, b, VIANA et al 2003, BARROS & PIMENTEL 2001, SILVA et al 2005, 2012, NEVIS et al 2009, ARRUDA & ABRUNHOSA 2011, BENTES et al 2011, MACIEL et al 2011, OLIVEIRA et al 2012a, b, PIRES et al 2008, CORRÊA & MARTINELLI 2009, SIMITH et al 2010. The scarceness of information extends to the area surrounding Belém, the state capital and home to major scientific research institutions.…”

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Biodiversity of decapod crustaceans in the estuarine floodplain around the city of Belém (Pará) in Brazilian Amazonia

Cavalcante¹,

Bentes²,

Martinelli-Lemos³

2012

Zoologia (Curitiba)

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ABSTRACT. The present study focused on the decapod fauna of the fluvial-estuarine environment of the Guajará Bay, in Milne-Edwards, 1853). While no significant differences were found in the ecological indices of diversity with respect to season, site, or trap size, a tendency for increased abundance and species richness was found during the dry season (August-November), in particular at some sites, apparently reflecting the influence of the estuary's saline wedge.

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Exceptional preservation of mid-Cretaceous marine arthropods and the evolution of novel forms via heterochrony

et al. 2019

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Evolutionary origins of novel forms are often obscure because early and transitional fossils tend to be rare, poorly preserved, or lack proper phylogenetic contexts. We describe a new, exceptionally preserved enigmatic crab from the mid-Cretaceous of Colombia and the United States, whose completeness illuminates the early disparity of the group and the origins of novel forms. Its large and unprotected compound eyes, small fusiform body, and leg-like mouthparts suggest larval trait retention into adulthood via heterochronic development (pedomorphosis), while its large oar-like legs represent the earliest known adaptations in crabs for active swimming. Our phylogenetic analyses, including representatives of all major lineages of fossil and extant crabs, challenge conventional views of their evolution by revealing multiple convergent losses of a typical “crab-like” body plan since the Early Cretaceous. These parallel morphological transformations may be associated with repeated invasions of novel environments, including the pelagic/necto-benthic zone in this pedomorphic chimera crab.

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

Cited by 3 publications

References 8 publications

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

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

Biodiversity of decapod crustaceans in the estuarine floodplain around the city of Belém (Pará) in Brazilian Amazonia

Exceptional preservation of mid-Cretaceous marine arthropods and the evolution of novel forms via heterochrony

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