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New early Cambrian sponges of the Siberian platform and the origins of spiculate crown‐group demospongesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Kolesnikov Kirill A., Botting Joseph P., Ivantsov Andrey Yu, Zhuravlev Andrey Yu
- Журнал: PAPERS IN PALAEONTOLOGY
- Том: 10
- Номер: 4
- Год издания: 2024
- Первая страница: 1
- Последняя страница: 18
- Номер статьи: e1582
- DOI: 10.1002/spp2.1582
- Аннотация: Sponges are among the most common anddiverse Cambrian fossils. However, the origin of the crown groups of the extant sponge classes constitutes the principal problem in the understanding of the evolution of theselower metazoans. New intact spiculate sponges from the lower Cambrian Stage 3–Stage 4 Sinsk Lagerst€atte of the Siberian Platform enable a better understanding of the early evolution of crown-group demosponges. The skeletons ofNeomenispongia plexa and N. diazoma gen. et sp. nov. consist mostly of simple oxeas, which are organized in relatively regular tufts that are additionally strengthened by sigmoidalspicules. The C-shaped elements of N. diazoma are megascleres in their size range but have sigmoidal shapes similar to sigma microscleres of extant demosponges; the sigmoidal spicules of N. plexa fully accord with microscleres and are the smallest spicules in known Cambrian demosponges.Together with an unnamed early Cambrian demospongefrom the Sirius Passet biota (Greenland) and middle Cambrian Ulospongiella from the Burgess Shale (Canada), the new species represent the earliest heteroscleromorph demospongesand indicate an evolutionary origin of microscleres from megascleres. The thin, homogenous skeleton of Keithospongos loricatus gen. et sp. nov. is built of small, spirallyarranged oxeas corresponding to the skeletal structure of the primitive Hazeliidae, which have been interpreted as the ancestral skeletal organization of demosponges. These new sponges therefore provide a link from extant spiculatedemosponge groups to their more familiar Cambrianancestors.
- Добавил в систему: Колесников Кирилл Артурович