<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442021000500550</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v69isuppl.1.46394</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[How can an infaunal brooding echinoid be maintained in the laboratory? A case study with Cassidulus mitis (Echinoidea: Cassiduloida)]]></article-title>
<article-title xml:lang="es"><![CDATA[¿Cómo se puede mantener un equinoide infantil en el laboratorio? Un estudio de caso con Cassidulus mitis (Echinoidea: Cassiduloida)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rezende-Ventura]]></surname>
<given-names><![CDATA[Carlos-Renato]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sousa-Pinto-de-Oliveira]]></surname>
<given-names><![CDATA[Monalisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Rio de Janeiro  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>69</volume>
<fpage>550</fpage>
<lpage>557</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442021000500550&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442021000500550&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442021000500550&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Cassiduloids play a prominent role in echinoid evolutionary history because they probably are the ancestral group of clypeasteroids. Some extant species are brooding and rare in the environment. Consequently, there are no studies on their maintenance in the laboratory.  Objective:  Establish an efficient aquarium system for C. mitis, endemic to Brazil, for ontogenetic studies.  Methods:  Four aquarium systems were built, with 3 replicates each one: (1) with seawater flow [F]; (2) with seawater flow and air injection into sediment [FA]; (3) without seawater flow but with air injection into the sediment [A]; and (4) without both seawater flow and air injection into the sediment [C]. Each experimental aquarium (three per treatment) had two adults. Each of the two sets of experiments lasted about 60 days.  Results:  We observed low mortality in the first 30 days in all systems and, after 30 days, it was higher in those with air-pumped into the sediment (system A in the first set of experiments, and system FA in the second one).  Conclusions:  For experiments lasting 30 days, our four systems are suitable. For longer periods, we recommend aquaria with seawater flow and without air-pumps into the sediment.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Los casiduloides desempeñan un papel destacado en la historia evolutiva de los equinoides porque probablemente son el grupo ancestral de clipeasteroides. Algunas especies existentes son inquietantes y raras en el medio ambiente. En consecuencia, no existen estudios sobre su mantenimiento en laboratorio.  Objetivo:  Establecer un sistema de acuario eficiente para C. mitis, endémica de Brasil, para estudios ontogenéticos.  Métodos:  Se construyeron cuatro sistemas de acuarios, con 3 réplicas cada uno: (1) con flujo de agua de mar [F]; (2) con flujo de agua de mar e inyección de aire en el sedimento [FA]; (3) sin flujo de agua de mar pero con inyección de aire en el sedimento [A]; y (4) sin flujo de agua de mar ni inyección de aire en el sedimento [C]. Cada acuario experimental (tres por tratamiento) tenía dos adultos. Cada uno de los dos conjuntos de experimentos duró aproximadamente 60 días.  Resultados:  Observamos una baja mortalidad en los primeros 30 días en todos los sistemas y, después de 30 días, fue mayor en aquellos con aire bombeado al sedimento (sistema A en el primer conjunto de experimentos y sistema FA en el segundo).  Conclusiones:  Para experimentos de 30 días, nuestros cuatro sistemas son adecuados. Para períodos más largos, recomendamos acuarios con flujo de agua de mar y sin bombas de aire en el sedimento.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[experimental model-species]]></kwd>
<kwd lng="en"><![CDATA[closed aquarium system]]></kwd>
<kwd lng="en"><![CDATA[survival rate]]></kwd>
<kwd lng="en"><![CDATA[sand-bottom]]></kwd>
<kwd lng="en"><![CDATA[echinoid deposit feeder]]></kwd>
<kwd lng="es"><![CDATA[modelo-especie experimental]]></kwd>
<kwd lng="es"><![CDATA[sistema de acuario cerrado]]></kwd>
<kwd lng="es"><![CDATA[tasa de supervivencia]]></kwd>
<kwd lng="es"><![CDATA[fondo de arena]]></kwd>
<kwd lng="es"><![CDATA[depósito alimentador de equinoides]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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