<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982026000200466</article-id>
<article-id pub-id-type="doi">10.17129/botsci.3751</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Flowers from Tzimol Quarry, Chiapas: Evidence of labile merism during the Late Cretaceous]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Damián]]></surname>
<given-names><![CDATA[Ana L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintanar-Castillo]]></surname>
<given-names><![CDATA[Angélica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubalcava-Knoth]]></surname>
<given-names><![CDATA[Marco A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cevallos-Ferriz]]></surname>
<given-names><![CDATA[Sergio R.S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Paleontología]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,aff2  ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2026</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2026</year>
</pub-date>
<volume>104</volume>
<numero>2</numero>
<fpage>466</fpage>
<lpage>480</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982026000200466&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982026000200466&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982026000200466&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: The Cretaceous Terrestrial Revolution represents a key interval in the evolutionary history of major terrestrial groups, including angiosperms. In recent years, the worldwide record of Cretaceous flowers has increased substantially, providing valuable information on the evolution, as well as the ecological and phylogenetic relationships of the early flowering plants; however, reports from low latitudes of North America are still scarce.  Questions: Do the flowers from Tzimol, Chiapas, Mexico, support the idea of diversification and differentiation of the angiosperms during the Late Cretaceous?  Studied species: Kanalflorum variabilis.  Study site and dates: Tzimol Quarry (Fm. Angostura), Chiapas, Mexico 2023-2024.  Methods: Using light microscopy, we described and identified the fossil flowers by comparing them with extant angiosperms. Furthermore, to explore their potential phylogenetic relationships, we used a morphological matrix which was analyzed through parsimony optimization.  Results: Kanalflorus variabilis is proposed as a new extinct genus and species based on bisexual flowers, pedicelled, with an enlarged receptacle, and a reduced calyx, apopetalous corolla with 5-6 concave petals, alternipetalous stamens, basifixed anthers, a nectarial ring disk, and a half-inferior ovary. Its floral structure is similar to eudicots, especially with extant members of the Apiales order, due to the meristic variation of the perianth.  Conclusions: Kanalflorus variabilis exhibits a labile meristic pattern, providing evidence of the diversity and morphological complexity of angiosperms during the Late Cretaceous.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: La Revolución Terrestre Cretácica representa un período clave en la historia evolutiva de los principales grupos terrestres, incluidas las angiospermas. En los últimos años, el registro mundial de angiospermas fósiles del Cretácico ha aumentado sustancialmente, aportando información valiosa sobre la evolución, así como de las relaciones ecológicas y filogenéticas de las primeras plantas con flor. Sin embargo, los registros provenientes de latitudes bajas de América del Norte siguen siendo escasos.  Preguntas: ¿Las flores cretácicas de Tzimol, Chiapas, México apoyan la idea de diversificación y diferenciación de las angiospermas durante el Cretácico Tardío?  Especies de estudio: Kanalflorum variabilis.  Sitio y años de estudio: Cantera Tzimol (Fm. Angostura), Chiapas, México 2023-2024.  Métodos: Usando microscopía óptica, describimos e identificamos las flores fósiles comparándolas con angiospermas actuales. Además, para explorar sus potenciales relaciones filogenéticas se empleó la matriz morfológica, la cual se analizó a través del criterio de optimización por parsimonia.  Resultados: Kanalflorus variabilis se propone como un nuevo género y especie extinta con base en flores bisexuales, pediceladas, con receptáculo extendido, y un cáliz reducido, corola apopétala con 5-6 pétalos cóncavos, estambres alternipétalos, anteras basifijas, y un ovario semiínfero. Su estructura floral es similar al de las eudicotiledóneas, y especialmente con miembros actuales del orden Apiales, debido a la variación merística del perianto.  Conclusiones: Kanalflorus variabilis presenta un patrón merístico lábil, proporcionando evidencia de la diversidad y complejidad morfológica de las angiospermas durante el Cretácico Superior.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Campanian]]></kwd>
<kwd lng="en"><![CDATA[eudicots]]></kwd>
<kwd lng="en"><![CDATA[fossil flowers]]></kwd>
<kwd lng="en"><![CDATA[meristic pattern]]></kwd>
<kwd lng="es"><![CDATA[Campaniano]]></kwd>
<kwd lng="es"><![CDATA[eudicotiledóneas]]></kwd>
<kwd lng="es"><![CDATA[flores fósiles]]></kwd>
<kwd lng="es"><![CDATA[patrón merístico]]></kwd>
</kwd-group>
</article-meta>
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