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Nervous system development in Spinicaudata and Cyclestherida (Crustacea, Branchiopoda)--comparing two different modes of indirect development by using an event pairing approach.
J Morphol. 2012 Jul; 273(7):672-95.JM

Abstract

Cladocera are the ecologically most important group within the Branchiopoda. They are unquestionably branchiopods but their evolutionary origin remains unclear. One favored explanation of their origin is that they evolved from a reproductive larva of a clam shrimp-like ancestor. To reveal a transformation and identify (potential) changes in chronology (heterochrony), we investigated and compared the development of representatives of two clam shrimp taxa, one of the Spinicaudata (Leptestheria dahalacensis) and one of the Cyclestherida (Cyclestheria hislopi), the sister group of Cladocera. Both taxa develop indirectly although the exact modes are quite different. The development of the nervous system, labeled and analyzed using immunohistochemical techniques and confocal microscopy, and that of the external morphology, scanned with an electron microscope, was investigated. L. dahalacensis hatch as a free-swimming nauplius and the nervous system and external morphology develop gradually. In C. hislopi, on the other hand, several internal and external structures develop before the hatching of a nonswimming embryo-like larva which is still carried in a dorsal brood pouch. The development in L. dahalacensis is directed from anterior to posterior, whereas in C. hislopi a more synchronous anterior and posterior differentiation is present. A comparison of both developmental sequences gives us the first indications of the evolutionary transformation which the Cladocera may have undergone from a clam shrimp-like ancestor.

Authors+Show Affiliations

Universitaet Rostock, Institut für Biowissensschaften, Allgemeine und Spezielle Zoologie, Universitaetsplatz 2, D-18055 Rostock, Germany. martin.fritsch@uni-rostock.deNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22460765

Citation

Fritsch, Martin, and Stefan Richter. "Nervous System Development in Spinicaudata and Cyclestherida (Crustacea, Branchiopoda)--comparing Two Different Modes of Indirect Development By Using an Event Pairing Approach." Journal of Morphology, vol. 273, no. 7, 2012, pp. 672-95.
Fritsch M, Richter S. Nervous system development in Spinicaudata and Cyclestherida (Crustacea, Branchiopoda)--comparing two different modes of indirect development by using an event pairing approach. J Morphol. 2012;273(7):672-95.
Fritsch, M., & Richter, S. (2012). Nervous system development in Spinicaudata and Cyclestherida (Crustacea, Branchiopoda)--comparing two different modes of indirect development by using an event pairing approach. Journal of Morphology, 273(7), 672-95. https://doi.org/10.1002/jmor.20014
Fritsch M, Richter S. Nervous System Development in Spinicaudata and Cyclestherida (Crustacea, Branchiopoda)--comparing Two Different Modes of Indirect Development By Using an Event Pairing Approach. J Morphol. 2012;273(7):672-95. PubMed PMID: 22460765.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Nervous system development in Spinicaudata and Cyclestherida (Crustacea, Branchiopoda)--comparing two different modes of indirect development by using an event pairing approach. AU - Fritsch,Martin, AU - Richter,Stefan, Y1 - 2012/03/28/ PY - 2011/11/02/received PY - 2011/12/15/revised PY - 2012/01/29/accepted PY - 2012/3/31/entrez PY - 2012/3/31/pubmed PY - 2012/10/6/medline SP - 672 EP - 95 JF - Journal of morphology JO - J Morphol VL - 273 IS - 7 N2 - Cladocera are the ecologically most important group within the Branchiopoda. They are unquestionably branchiopods but their evolutionary origin remains unclear. One favored explanation of their origin is that they evolved from a reproductive larva of a clam shrimp-like ancestor. To reveal a transformation and identify (potential) changes in chronology (heterochrony), we investigated and compared the development of representatives of two clam shrimp taxa, one of the Spinicaudata (Leptestheria dahalacensis) and one of the Cyclestherida (Cyclestheria hislopi), the sister group of Cladocera. Both taxa develop indirectly although the exact modes are quite different. The development of the nervous system, labeled and analyzed using immunohistochemical techniques and confocal microscopy, and that of the external morphology, scanned with an electron microscope, was investigated. L. dahalacensis hatch as a free-swimming nauplius and the nervous system and external morphology develop gradually. In C. hislopi, on the other hand, several internal and external structures develop before the hatching of a nonswimming embryo-like larva which is still carried in a dorsal brood pouch. The development in L. dahalacensis is directed from anterior to posterior, whereas in C. hislopi a more synchronous anterior and posterior differentiation is present. A comparison of both developmental sequences gives us the first indications of the evolutionary transformation which the Cladocera may have undergone from a clam shrimp-like ancestor. SN - 1097-4687 UR - https://www.unboundmedicine.com/medline/citation/22460765/Nervous_system_development_in_Spinicaudata_and_Cyclestherida__Crustacea_Branchiopoda___comparing_two_different_modes_of_indirect_development_by_using_an_event_pairing_approach_ L2 - https://doi.org/10.1002/jmor.20014 DB - PRIME DP - Unbound Medicine ER -