Cited by 76Developmental Biology and Gene RegulationEchinoderm biology and ecologyMarine Invertebrate Physiology and Ecology

DEVELOPMENT OF A "PRIMITIVE" SEA URCHIN (EUCIDARIS TRIBULOIDES:) IRREGULARITIES IN THE HYALINE LAYER, MICROMERES, AND PRIMARY MESENCHYME

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SCHROEDER, THOMAS E.·1981·The Biological Bulletin

Abstract

The normal embryonic development of the cidaroid sea urchin Eucidaris tribuloides from fertilization to the late two-armed larval stage is described with the aid of light and electron microscopy. Unusual developmental features include a virtual absence of a hyaline layer, irregularities in the number and size of micromeres, and a total lack of early mesenchyme (the so-called primary mesenchyme). These and other features are unlike developmental characters in the euechinoids ("modern" sea urchins). They are discussed with reference to the phylogeny of sea urchins. Eucidaris tribuloides may exhibit "primitive" developmental patterns representative of the cidaroid ancestor which was common to all living sea urchins.

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Crossref · 10.2307/1541114

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  • Among echinoderms, only modern sea urchins (euechinoids) generate a precociously specified embryonic micromere lineage that ingresses before gastrulation and then secretes the biomineral embryonic skeleton.

    “Of the five echinoderm classes, only the modern sea urchins (euechinoids) generate a precociously specified embryonic micromere lineage that ingresses before gastrulation and then secretes the biomineral embryonic skeleton.”
  • The euechinoid skeletogenic micromere lineage and its embryonic skeletal structures are a derived euechinoid character that appeared in the euechinoid common ancestor probably not long after 250 mya.

    “The euechinoid skeletogenic micromere lineage and its embryonic skeletal structures thus may be considered a derived euechinoid character that appeared in the euechinoid common ancestor probably not long after 250 mya.”

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Authors
SCHROEDER, T. E.
Affiliations
University of Washington (US)
Corresponding author
SCHROEDER, THOMAS E.
Venue
The Biological Bulletin
Published
1981-08
Volume
161
Issue
1
Pages
141-151
ISSN
  • 0006-3185 (ISSN-L)
  • 1939-8697
OpenAlex
W2465544092
Cited by
76
References
10
Citations by year
2024: 1 · 2022: 3 · 2020: 1 · 2019: 6 · 2018: 3 · 2017: 2 · 2016: 4 · 2015: 6 · 2014: 1 · 2013: 2 · 2012: 2
FWCI
0.51
Type
journal article
Language
en
Licence
cc-by-nc-sa
Locations
  • Biological Bulletin (publishedVersion)
  • Biodiversity Heritage Library (Smithsonian Institution) (submittedVersion, cc-by-nc-sa)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Echinoderm biology and ecology
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
Keywords
Eucidaris tribuloides, embryonic development, hyaline layer, micromeres, primary mesenchyme, larval development, evolutionary developmental biology

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