The manca stages of Porcellio dilatatus Brandt (Crustacea, Isopoda, Oniscidea)

Brum, Pedro Erê Disconzi; Araujo, Paula Beatriz

doi:10.1590/s0101-81752007000200030

Cited by 19 publications

(20 citation statements)

References 5 publications

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“…This contradicts the general view of only one marsupial manca stage (Araujo et al 2004;Brum and Araujo 2007). Interestingly, in both manca stages-neither in SEM nor with nuclei staining-no indication for the outgrowth of the seventh pereopod is given.…”

Section: Manca Stages and Post-marsupial Developmentmentioning

confidence: 58%

“…They cover the soft-skinned gills of pleopods 3 to 5. These tufts of hairy setae are already described for Porcellio dilatatus and are probably an adaptation to life inside the marsupium (Brum and Araujo 2007). Whether this structure gets lost by moulting or the juveniles just lose it during further development is not clear.…”

Section: Manca Stages and Post-marsupial Developmentmentioning

confidence: 87%

“…It could be an indication that these hairy structures get lost without a moult, or it is just an artefact during SEM preparation. Other characteristics like the increasing number of sensory setae at the distal segments of antenna 2 and the extension of the distal article of antenna 2 display typical features during postembryonic development in isopods (Brum and Araujo 2007;Tomescu and Craciun 1987).…”

Section: Manca Stages and Post-marsupial Developmentmentioning

confidence: 99%

“…Interestingly, in both manca stages-neither in SEM nor with nuclei staining-no indication for the outgrowth of the seventh pereopod is given. Studies about manca development (Araujo et al 2004;Brum and Araujo 2007) show that a differentiation of a seventh pereopod takes place in two consecutive postmarsupial stages. This is a support for two real marsupial manca stages instead of just one "real" marsupial manca stage and one manca stage-already bearing the anlage of the seventh pereopod-which is going to leave the marsupium.…”

Section: Manca Stages and Post-marsupial Developmentmentioning

confidence: 99%

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The embryonic development of the malacostracan crustacean Porcellio scaber (Isopoda, Oniscidea)

Wolff

2009

Dev Genes Evol

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To examine the evolution of development and put it into a phylogenetic context, it is important to have, in addition to a model organism like Drosophila, more insights into the huge diversity of arthropod morphologies. In recent years, the malacostracan crustacean Porcellio scaber Latreille, 1804 has become a popular animal for studies in evolutionary and developmental biology, but a detailed and complete description of its embryonic development is still lacking. Therefore, the embryonic development of the woodlouse P. scaber is described in a series of discrete stages easily identified by examination of living animals and the widely used technique of nuclei staining on fixed specimens. It starts with the first cleavage of the zygote and ends with a hatched manca that eventually leaves the mother's brood pouch. Classical methods like normal light microscopy, scanning electron microscopy and fluorescence microscopy are used, in addition to confocal LCM and computer-aided 3D reconstruction in order to visualise important processes during ontogeny. The purpose of these studies is to offer an easy way to define the different degrees of development for future comparative analyses of embryonic development amongst crustaceans in particular, as well as between different arthropod groups. In addition, several aspects of Porcellio embryonic development, such as the mouth formation, limb differentiations and modifications or the formation of the digestive tract, make this species particularly interesting for future studies in evolutionary and developmental biology.

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Section: Manca Stages and Post-marsupial Developmentmentioning

confidence: 58%

Section: Manca Stages and Post-marsupial Developmentmentioning

confidence: 87%

Section: Manca Stages and Post-marsupial Developmentmentioning

confidence: 99%

Section: Manca Stages and Post-marsupial Developmentmentioning

confidence: 99%

See 2 more Smart Citations

The embryonic development of the malacostracan crustacean Porcellio scaber (Isopoda, Oniscidea)

Wolff

2009

Dev Genes Evol

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“…They were individually placed in plastic recipient (9 cm diameter) containing damp piece of filter paper and some cotton to maintain humidity. Litter from sampling area was offered as food (Helden & Hassall, 1998;Brum & Araujo, 2007). Animals were kept at a constant temperature of 20±1°C, with moisture of 50±2% and a day length of 14 hours.…”

Section: Laboratory Proceduresmentioning

confidence: 99%

Reproductive Patterns of Terrestrial Isopods (Crustacea, Isopoda, Oniscidea) from Uruguay

Waller

Verdi

2016

IJB

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Armadillidium vulgare (Latreille, 1884) and Armadillidium nasatum (Schultz, 1961) are among the most common species of terrestrial isopods in Uruguay. The reproductive pattern of these species was studied, for first time, on a natural population at Department of San Jose (Uruguay) from June 2010 to July 2011. A total of 9136 individuals were sampled, of these 7010 were A. vulgare and 2126 were A.nasatum. Adults of A. vulgare were present throughout the year and juveniles appeared from February to November. Juveniles and adults of A. nasatum appeared from January to October, and practically disappeared from November to December. For both species ovigerous females were collected from spring to summer (October to March), this would indicate a seasonal reproduction followed by a sexual rest. In A. vulgare reproductive females cephalothorax width that varied between 1.7 to 3 mm, average fecundity was equal to 39 ± 5 eggs and average fertility was equal to 27 ± 4. In A. nasatum cephalothorax width of reproductive females oscillated between 1.5 to 2.9 mm and the average fecundity was 44 ± 5 eggs. For both species, fecundity and fertility were positively correlated with the size of the females. The incubation period ( ̅ = 13 days) and the mancas born ( ̅ = 21) were similar for both species.

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Effects of thermal and oxygen conditions during development on cell size in the common rough woodlice Porcellio scaber

Antoł

Łabęcka

Horváthová

et al. 2020

Ecology and Evolution

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During development, cells may adjust their size to balance between the tissue metabolic demand and the oxygen and resource supply: Small cells may effectively absorb oxygen and nutrients, but the relatively large area of the plasma membrane requires costly maintenance. Consequently, warm and hypoxic environments should favor ectotherms with small cells to meet increased metabolic demand by oxygen supply. To test these predictions, we compared cell size (hindgut epithelium, hepatopancreas B cells, ommatidia) in common rough woodlice (Porcellio scaber) that were developed under four developmental conditions designated by two temperatures (15 or 22°C) and two air O2 concentrations (10% or 22%). To test whether small‐cell woodlice cope better under increased metabolic demand, the CO2 production of each woodlouse was measured under cold, normoxic conditions and under warm, hypoxic conditions, and the magnitude of metabolic increase (MMI) was calculated. Cell sizes were highly intercorrelated, indicative of organism‐wide mechanisms of cell cycle control. Cell size differences among woodlice were largely linked with body size changes (larger cells in larger woodlice) and to a lesser degree with oxygen conditions (development of smaller cells under hypoxia), but not with temperature. Developmental conditions did not affect MMI, and contrary to predictions, large woodlice with large cells showed higher MMI than small woodlice with small cells. We also observed complex patterns of sexual difference in the size of hepatopancreatic cells and the size and number of ommatidia, which are indicative of sex differences in reproductive biology. We conclude that existing theories about the adaptiveness of cell size do not satisfactorily explain the patterns in cell size and metabolic performance observed here in P. scaber. Thus, future studies addressing physiological effects of cell size variance should simultaneously consider different organismal elements that can be involved in sustaining the metabolic demands of tissue, such as the characteristics of gas‐exchange organs and O2‐binding proteins.

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The manca stages of Porcellio dilatatus Brandt (Crustacea, Isopoda, Oniscidea)

Cited by 19 publications

References 5 publications

The embryonic development of the malacostracan crustacean Porcellio scaber (Isopoda, Oniscidea)

The embryonic development of the malacostracan crustacean Porcellio scaber (Isopoda, Oniscidea)

Reproductive Patterns of Terrestrial Isopods (Crustacea, Isopoda, Oniscidea) from Uruguay

Effects of thermal and oxygen conditions during development on cell size in the common rough woodlice Porcellio scaber

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