Review of some Hystricosporites representatives from Bolivia
DOI:
https://doi.org/10.4072/rbp.2024.1.0431Abstract
A taxonomic study of megaspores with bifurcate-tipped processes from the Devonian–Carboniferous transition of Bolivia was performed. Megaspore specimens were isolated from palynological samples of the Pando X1 and Manuripi X1 boreholes. Their morphological characteristics and wall structures were described and illustrated with transmitted optical light, ultraviolet fluorescence, and scanning electron microscopy. This megaspore assemblage comprised six fossil species of Hystricosporites (H. costatus, H. delectabilis, H. elongatus, H. expandus, H. furcatus and H. spiralis). The morphologic features of their sporoderms confirm that these megaspores with bifurcate-tipped processes could have had a botanical affinity related to lycopsids. Additional future studies of wall ultrastructure using transmission electron microscopy will provide more information about their phylogenetic relationships with fossil and extant lycopsids.
Keywords: megaspores, lycopsids, Carboniferous, Devonian.
Resumo – Foi realizado um estudo taxonômico de megásporos com processos de pontas bifurcadas da transição Devoniano–Carbonífero da Bolívia. Espécimes de megásporos foram isolados de amostras palinológicas dos furos Pando X1 e Manuripi X1 e suas características morfológicas e estruturas de parede foram descritas e ilustradas com luz óptica transmitida, fluorescência ultravioleta e microscopia eletrônica de varredura. Esta associação de megásporos era composta por seis espécies fósseis de Hystricosporites (H. costatus, H. delectabilis, H. elongatus, H. expandus, H. furcatus e H. spiralis). As características morfológicas de seus esporodermos confirmam que esses megásporos com processos com pontas bifurcadas poderiam ter tido uma afinidade botânica relacionada às licopsídeas. Futuros estudos de ultraestruturas de parede, utilizando microscopia eletrônica de transmissão permitirão obter mais informações sobre suas relações filogenéticas com licopsídeas fósseis e existentes.
Palavras-chave: megásporos, licopsídeas, Carbonífero, Devoniano.
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