Abstract：
:Growth dynamics of the primary spine of the cidaroid sea urchin Phyllacanthus imperialis was assessed for the first time using pulsed (26) Mg-labeling and NanoSIMS isotopic imaging. The sea urchin was incubated twice (for 48 h) in artificial seawater with elevated level of (26) Mg. After each labeling event, the sea urchin was returned for 72 h to seawater with natural isotopic abundance of (26) Mg. NanoSIMS ion microprobe was subsequently used to visualize the labeled regions of the spine with submicrometer lateral resolution. The growth of the new skeleton was restricted to the distalmost and peripheral portions of the spine. Skeletogenesis involved mostly the deposition of continuous thickening layers and lateral growth involving bridges between previously formed trabeculae. The timescale of formation of individual thickening layers (ca. 1 µm in width) on the stereom trabeculae was on the order of 1 day. Longitudinal growth occurred mainly at the periphery in the form of small portions of the thickening deposits or more massive microspines that appeared to branch and fuse with those above and below. These microspines were found to grow at about 10 µm/day. These results reveal that the skeletal growth of a juvenile cidaroid spine is complex and highly heterogeneous, with different extension rates depending on the stage of the stereom development and/or direction of the growth fronts. The growth pattern observed here at the submicrometer scale provides direct evidence supporting the earlier suggestions that the lamellar structure of echinoderm stereom is formed by periodic deposition of continuous mineral layers.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Gorzelak P,Stolarski J,Dery A,Dubois P,Escrig S,Meibom Adoi
10.1002/jmor.20260subject
Has Abstractpub_date
2014-07-01 00:00:00pages
788-96issue
7eissn
0362-2525issn
1097-4687journal_volume
275pub_type
杂志文章abstract：:Morphology is strongly correlated with trophic mode in marine invertebrate larvae. We asked if larval morphogenesis is influenced by adelphophagy, a trophic mode in which larvae are provisioned with additional yolk in the form of extra-embryonic nurse eggs, instead of the more common increase in egg size. We used hist...
journal_title：Journal of morphology
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journal_title：Journal of morphology
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更新日期：1981-06-01 00:00:00
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pub_type： 杂志文章
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：1977-11-01 00:00:00
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更新日期：1986-12-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2015-03-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2011-04-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2011-03-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051510305
更新日期：1977-03-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/1097-4687(200009)245:3<206::AID-JMOR3>3.0.
更新日期：2000-09-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052090305
更新日期：1991-09-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20371
更新日期：2015-06-01 00:00:00
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journal_title：Journal of morphology
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doi：10.1002/jmor.1051990307
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：1995-02-01 00:00:00
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：2002-02-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：1999-05-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2002-05-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2008-09-01 00:00:00
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journal_title：Journal of morphology
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更新日期：1998-01-01 00:00:00
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更新日期：2012-01-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：1975-04-01 00:00:00
abstract：:The structure, attachment and subsequent metamorphosis of larvae of the marine bryozoan Bugula neritina were studied by light and electron microscopy. Two points of larval anatomy are of special significance to proper interpretation of the metamorphosis: 1 Two cytologically similar blastemal tissues, each laden with f...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051340307
更新日期：1971-07-01 00:00:00
