<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282025000300030</article-id>
<article-id pub-id-type="doi">10.19136/era.a12n3.4623</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización morfológica de Aggregata spp. parásito del calamar Lolliguncula panamensis en el Golfo de Tehuantepec]]></article-title>
<article-title xml:lang="en"><![CDATA[Morphological characterization of Aggregata spp., a parasite of the squid Lolliguncula panamensis in the Gulf of Tehuantepec]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Garcia]]></surname>
<given-names><![CDATA[Víctor Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galicia-Jiménez]]></surname>
<given-names><![CDATA[Mónica Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nieto-Castañeda]]></surname>
<given-names><![CDATA[Irma Gisela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alejo-Plata]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Mar  ]]></institution>
<addr-line><![CDATA[Juquila Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Mar Instituto de Investigación de Genética ]]></institution>
<addr-line><![CDATA[Juquila Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad del Mar Instituto de Investigación de Ecología ]]></institution>
<addr-line><![CDATA[Juquila Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad del Mar Instituto de Investigación de Recursos ]]></institution>
<addr-line><![CDATA[San Pedro Pochutla Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>12</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282025000300030&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282025000300030&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282025000300030&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los Apicomplexa, como Aggregata, son parásitos intracelulares que infectan moluscos y crustáceos, con ciclos de vida heteroxenos (etapas asexuales en crustáceos y sexuales en cefalópodos). Este estudio caracterizó morfológicamente Aggregata spp. en el calamar Lolliguncula panamensis del golfo de Tehuantepec, México. Se analizaron 21 hembras en desove, identificando nódulos blanquecinos iridiscentes (0.02-0.92 mm) en el tracto digestivo y otros tejidos, indicando infección extraintestinal. Microscópicamente, se observaron microgametos (1.42 ± 0.06 µm, un flagelo), macrogametos (9.82 × 8.9 µm) y esporoquistes (12.83 × 10.39 µm) con dos esporozoítos (3.75 ± 0.15 µm). Comparado con otras especies, este parásito presentó diferencias clave: menor tamaño de esporozoítos y solo dos por esporoquiste (vs. 3-22 en otras). Los resultados sugieren una posible nueva especie o variante geográfica. Este es el primer registro detallado de Aggregata en L. panamensis, resaltando la necesidad de estudios moleculares para confirmar su taxonomía.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Apicomplexa, such as Aggregata, are intracellular parasites that infect mollusks and crustaceans, with heteroxenous life cycles (asexual stages in crustaceans and sexual stages in cephalopods). This study morphologically characterized Aggregata spp. in the squid Lolliguncula panamensis from the Gulf of Tehuantepec, Mexico. Twenty-one spawning females were analyzed, identifying iridescent whitish nodules (0.02-0.92 mm) in the digestive tract and other tissues, indicating extraintestinal infection. Microscopically, microgametes (1.42 ± 0.06 µm, one flagellum), macrogametes (9.82 × 8.9 µm), and sporocysts (12.83 × 10.39 µm) with two sporozoites (3.75 ± 0.15 µm) were observed. Compared to other species, this parasite presented key differences: smaller sporozoite size and only two per sporocyst (vs. 3-22 in others). The results suggest a possible new species or geographic variant. This is the first detailed record of Aggregata in L. panamensis, highlighting the need for molecular studies to confirm its taxonomy.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Apicomplexa]]></kwd>
<kwd lng="es"><![CDATA[parásitos de cefalópodos]]></kwd>
<kwd lng="es"><![CDATA[morfología parasitaria]]></kwd>
<kwd lng="es"><![CDATA[Lolliguncula panamensis]]></kwd>
<kwd lng="en"><![CDATA[Apicomplexa]]></kwd>
<kwd lng="en"><![CDATA[cephalopod parasites]]></kwd>
<kwd lng="en"><![CDATA[morphological taxonomy]]></kwd>
<kwd lng="en"><![CDATA[Lolliguncula panamensis]]></kwd>
</kwd-group>
</article-meta>
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