Clarification of the diagnosis of the genus Loxosoma s.l. (Entoprocta; Loxosomatidae) based on morphological and molecular dataстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.
Аннотация:Loxosomatidae are solitary entoprocts associated with various types of invertebrate hosts. Two genera are distinguishedin the family Loxosomatidae, Loxosomella and Loxosoma, that have clear morphological differences in the attachmentstructures. Loxosoma attaches to the substratum by a muscular sucking pedal disk, which allows moving. Both kidneysand adults are thought to have a pedal disc throughout their lives. In August 2021, several specimens of loxosomatidswere found in the White Sea at a depth of 30–70 m on a polychaete Laonice sp. (Spionidae), which were investigatedusing light and electron microscopy as well as molecular phylogenetic analysis. These loxosomatids were identified asLoxosomella aripes Nielsen, although a stalk of large buds of the specimens from the White Sea terminate with a pedal disctypical of Loxosoma. Molecular phylogenetic analysis of two markers [28S rRNA (~380bp) and 18S rRNA (in three partstotaling ~1850bp)] confirms the affinity of the species to Loxosoma s.l. and does not confirm monophyly of the generaLoxosoma and Loxosomella, indicating that the entire system of loxosomatids requires revision. Here, we redescribethe species Loxosomella aripes as Loxosoma s.l. aripes. The diagnosis of the genus Loxosoma s.l. is supplemented withthe observation that the structure of the attachment organ can change after anchoring to the substrate. A list of speciescurrently assigned to Loxosomella that may in fact belong to the genus Loxosoma s.l. is also given.