![]() The three species included in Stenopeltis by Itono & Yoshizaki () were all originally described in Yamada () and the only subsequent detailed treatments of these species were in Nozawa (,, the latter an English version of the earlier Japanese paper). When describing the genus, Itono & Yoshizaki () retained Stenopeltis in the Polyidaceae (Gigartinales), the family in which Kylin () originally placed Rhodopeltis. The type species is Stenopeltis gracilis (Yamada et Tanaka) Itono et Yoshizaki. Cystocarps form surface nemathecia in which the carposporangia are terminal and are intermixed with paraphyses. Distinguishing features of the genus include a calcified, multiaxial thallus in which the cortex is filamentous but with markedly inflated subcortical cells, lateral carpogonial branches, and (apparently) a nutritive auxiliary cell that is the basal cell of a cortical fascicle or the supporting cell of the carpogonial branch. The genus Stenopeltis was erected by Itono & Yoshizaki () for three northwestern Pacific species previously placed in Rhodopeltis Harvey. gracilis (the type), and the segregate genus Akalaphycus is proposed to accommodate S. setchelliae are distinct from those of S. LSU sequences as well as carpogonial branch and cystocarp morphology of S. ![]() The morphology and reproduction of the three species currently attributed to the genus, S. ![]() These observations are at odds with the existing taxonomic placement of the genus and a re-interpretation of earlier observations purporting to show the presence of auxiliary cells is presented. Moreover, phylogenetic analyses based on LSU (large subunit) rDNA sequences clearly place Stenopeltis in a clade with members of the Liagoraceae. Post-fertilization events in Stenopeltis gracilis (the type of the genus) include a spreading, diffuse gonimoblast arising directly from the zygote ( = post-fertilization carpogonium), and no auxiliary cells, features characteristic of the Liagoraceae. A morphological and gene sequence study has shown the red algal genus Stenopeltis to be a member of the Liagoraceae (Nemaliales), not the Polyidaceae (Gigartinales) where it was placed after being segregated from Rhodopeltis.
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