Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)

Junzeng Xue; Yan Liu; Neil Cumberlidge; Huixian Wu

doi:10.1007/s00343-013-2210-3

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Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)

OriginalPaper | Updated：2023-05-16

- Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)
- Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)
- 海洋湖沼学报（英文） 2013年31卷第3期页码：542-551
- Affiliations：
  
  1. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources Shanghai Ocean University
  2. Department of Biology Northern Michigan University
- Author bio：
- Funds：
  
  Supported by the Leading Academic Discipline Project of Shanghai Municipal Education Commission (No. J50701)
- DOI：10.1007/s00343-013-2210-3
  中图分类号：
- 网络首发：2013-05-08，
  
  纸质出版：2013
- Accepted：
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Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)[J]. 海洋湖沼学报（英文）, 2013,31(3):542-551.

Xue, J., Liu, Y., Cumberlidge, N. et al. Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)., Chin. J. Ocean. Limnol. 31, 542–551 (2013). https://doi.org/10.1007/s00343-013-2210-3
Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)[J]. 海洋湖沼学报（英文）, 2013,31(3):542-551. DOI： 10.1007/s00343-013-2210-3.

Xue, J., Liu, Y., Cumberlidge, N. et al. Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)., Chin. J. Ocean. Limnol. 31, 542–551 (2013). https://doi.org/10.1007/s00343-013-2210-3 DOI：

摘要

Abstract

This study expands on recent reports that direct development in the Chinese potamid freshwater crab Sinopotamon yangtsekiense involves the completion of all brachyuran larval stages (nauplius

zoea

and megalopa) inside the egg case during embryonic development. Detailed studies of embryonic development in this species revealed the presence of an additional larval stage (the egg-juvenile) between the megalopa and the free-living hatchling crab. We described and compared the appendages of the head

thorax

and abdomen of the egg-juvenile with those of the hatchling crab in S. yangtsekiense. Significant differences were found between most of the appendages of these two stages with a soft exoskeleton in the egg-juvenile

no joint articulation

a slimmer appearance

and a lack of setae when compared with the newly emerged free-living hatchling crab. These modifications of the appendages are related to the confinement within the egg case of the egg-megalopa and egg-juvenile during direct development

and the need for the free-living hatchling freshwater crab to move

feed

and respire. In marine crabs

the megalopa gives rise to the first crab stage whereas in freshwater crabs the egg-juvenile follows the megalopa and immediately precedes the free-living first crab stage.

关键词

Keywords

references

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