First stage zoeal descriptions of five Galatheoidea species from Western Pacific (Crustacea: Decapoda: Anomura)

Guerao, Guillermo; Macpherson, Enrique; Samadi, Sarah; Forges, Bertrand Richer de; Boisselier, Marie-Catherine

doi:10.11646/zootaxa.1227.1.1

Cited by 16 publications

(12 citation statements)

References 51 publications

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“…All Aeglidae investigated so far have direct development (Bond‐Buckup, Bueno & Keunecke, ; Lizardo‐Daudt & Bond‐Buckup, ; Francisco, Bueno & Kihara, ; Teodósio & Masunari, ). This is in contrast to their marine relatives, which usually show normal development through four to five zoea stages and one decapodid (Anger, ; Guerao et al , ). Abbreviated planktonic development is known for the lomisid Lomis hirta (Lamarck) (Cormie, ) and the chirostylid Uroptychus politus (Henderson) (Guerao et al , ).…”

Section: Development and Brood Care In Freshwater Anomuransmentioning

confidence: 84%

Abbreviation of larval development and extension of brood care as key features of the evolution of freshwater Decapoda

2012

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The transition from marine to freshwater habitats is one of the major steps in the evolution of life. In the decapod crustaceans, four groups have colonized fresh water at different geological times since the Triassic, the freshwater shrimps, freshwater crayfish, freshwater crabs and freshwater anomurans. Some families have even colonized terrestrial habitats via the freshwater route or directly via the sea shore. Since none of these taxa has ever reinvaded its environment of origin the Decapoda appear particularly suitable to investigate life-history adaptations to fresh water. Evolutionary comparison of marine, freshwater and terrestrial decapods suggests that the reduction of egg number, abbreviation of larval development, extension of brood care and lecithotrophy of the first posthatching life stages are key adaptations to fresh water. Marine decapods usually have high numbers of small eggs and develop through a prolonged planktonic larval cycle, whereas the production of small numbers of large eggs, direct development and extended brood care until the juvenile stage is the rule in freshwater crayfish, primary freshwater crabs and aeglid anomurans. The amphidromous freshwater shrimp and freshwater crab species and all terrestrial decapods that invaded land via the sea shore have retained ocean-type planktonic development. Abbreviation of larval development and extension of brood care are interpreted as adaptations to the particularly strong variations of hydrodynamic parameters, physico-chemical factors and phytoplankton availability in freshwater habitats. These life-history changes increase fitness of the offspring and are obviously favoured by natural selection, explaining their multiple origins in fresh water. There is no evidence for their early evolution in the marine ancestors of the extant freshwater groups and a preadaptive role for the conquest of fresh water. The costs of the shift from relative r- to K-strategy in freshwater decapods are traded-off against fecundity, future reproduction and growth of females and perhaps against size of species but not against longevity of species. Direct development and extension of brood care is associated with the reduction of dispersal and gene flow among populations, which may explain the high degree of speciation and endemism in directly developing freshwater decapods. Direct development and extended brood care also favour the evolution of social systems, which in freshwater decapods range from simple subsocial organization to eusociality. Hermaphroditism and parthenogenesis, which have evolved in some terrestrial crayfish burrowers and invasive open water crayfish, respectively, may enable populations to adapt to restrictive or new environments by spatio-temporal alteration of their socio-ecological characteristics. Under conditions of rapid habitat loss, environmental pollution and global warming, the reduced dispersal ability of direct developers may turn into a severe disadvantage, posing a higher threat of extinction to freshwater crayfish, primary fresh...

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Section: Development and Brood Care In Freshwater Anomuransmentioning

confidence: 84%

Abbreviation of larval development and extension of brood care as key features of the evolution of freshwater Decapoda

2012

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“…Knowledge on larval development of squat lobsters is very limited and unfortunately there are no data for Paramunida . Other genera of the family Munididae, however, are characterized by small eggs developing into planktrotophic larvae (Guerao et al 2006; Baba et al 2011). A similar developmental mode would imply a high power of dispersal for larvae of Paramunida .…”

Section: Discussionmentioning

confidence: 99%

Deep Under the Sea: Unraveling the Evolutionary History of the Deep-Sea Squat Lobster Paramunida (Decapoda, Munididae)

et al. 2012

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The diversification of Indo-Pacific marine fauna has long captivated the attention of evolutionary biologists. Previous studies have mainly focused on coral reef or shallow water-associated taxa. Here, we present the first attempt to reconstruct the evolutionary history-phylogeny, diversification, and biogeography-of a deep-water lineage. We sequenced the molecular markers 16S, COI, ND1, 18S, and 28S for nearly 80% of the nominal species of the squat lobster genus Paramunida. Analyses of the molecular phylogeny revealed an accelerated diversification in the late Oligocene-Miocene followed by a slowdown in the rate of lineage accumulation over time. A parametric biogeographical reconstruction showed the importance of the southwest Pacific area, specifically the island arc of Fiji, Tonga, Vanuatu, Wallis, and Futuna, for diversification of squat lobsters, probably associated with the global warming, high tectonic activity, and changes in oceanic currents that took place in this region during the OligoceneMiocene period. These results add strong evidence to the hypothesis that the Neogene was a period of major diversification for marine organisms in both shallow and deep waters.

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“…Any inferences concerning the dispersion of Allogalathea are highly speculative, as knowledge of larval development in Galatheidae is scarce (e.g. Guerao et al ., 2006). The diversification of the galatheid genus Munida has been dated as Middle or Late Miocene based on general mean divergence values for the 16S rRNA and COI genes (Machordom & Macpherson, 2004).…”

Section: Discussionmentioning

confidence: 99%

Allogalathea (Decapoda: Galatheidae): a monospecific genus of squat lobster?

Cabezas

Macpherson

Machordom

2011

Zoological Journal of the Linnean Society

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The genus Allogalathea was established by Baba in 1969 to include the well-known species Galathea elegans. This species is widely distributed across the Indo-West Pacific Ocean, and is characterized by living in close association with crinoids, and by its conspicuous coloration. Although the genus is considered monospecific, different colour patterns and discrete morphological variations mainly associated with the rostrum and chelipeds have been reported. These differences could point to cryptic species, thereby questioning Allogalathea as a monotypic taxon. To address this issue, we sequenced the mitochondrial cytochrome oxidase I (COI; 658 bp) and 16S rRNA (882 bp) genes and the nuclear gene phosphoenolpyruvate carboxykinase (PEPCK; 598 bp) in numerous specimens from eight different localities, and also examined their morphological characters. DNA sequences were analysed using maximum-parsimony, maximum-likelihood, and Bayesian approaches of phylogenetic inference. The resulting trees were combined with morphological evidence to test species boundaries. Our molecular data revealed four deeply divergent clades, which can be distinguished by subtle morphological differences in the spinulation and length-: breadth ratio of the P1 carpus, spinulation of the walking legs, and shape of the rostrum. Our findings indicated that Allogalathea elegans is in fact a species complex comprising four different species, which, although genetically very distinct, are morphologically very similar. We provide morphological descriptions and a key to these four species of the genus.z oj_681 245..270

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First stage zoeal descriptions of five Galatheoidea species from Western Pacific (Crustacea: Decapoda: Anomura)

Cited by 16 publications

References 51 publications

Abbreviation of larval development and extension of brood care as key features of the evolution of freshwater Decapoda

Abbreviation of larval development and extension of brood care as key features of the evolution of freshwater Decapoda

Deep Under the Sea: Unraveling the Evolutionary History of the Deep-Sea Squat Lobster Paramunida (Decapoda, Munididae)

Allogalathea (Decapoda: Galatheidae): a monospecific genus of squat lobster?

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