Paleontological JournalPaleontological JournalПалеонтологический журнал0031-031X3034-5871The Russian Academy of Sciences67796510.31857/S0031031X24060053QILTVEArticlesСтатьиResearch ArticleEffect of posterior gut reduction on the evolution of rhynchonelliform brachiopodsВлияние редукции заднего отдела кишечника на эволюцию ринхонеллиформных брахиоподSelischevaА. А.СелищеваА. А.
Russian Federation
selav21@mail.ruLomonosov Moscow State UniversityМосковский государственный университет имени М.В. Ломоносова191220246375501042025Copyright ©; 2024, Russian Academy of SciencesCopyright ©; 2024, Российская академия наук2024Russian Academy of SciencesРоссийская академия наукhttps://transsyst.ru/0031-031X/article/view/677965

Brachiopods are a group of animals known since the Early Cambrian and thrived in the Paleozoic. After the Permian–Triassic extinction, there was a significant reduction in the taxonomic diversity of brachiopods. According to one hypothesis, in the Mesozoic, brachiopods with blind gut could not reinstate their numbers due to the predominance of shelly plankton. We assume that the terebratulids, the most widespread group of modern brachiopods, were able to adapt to the changed composition of food due to a more efficient filtration mechanism of the plectolophous lophophore. Extant rhynchonellids have a blind–closed bulbus end of digestive tract, which is probably used for crushing and digesting shelly plankton.

Брахиоподы – группа животных, известная с раннего кембрия и достигшая расцвета в палеозое. После пермско-триасового вымирания произошло значительное сокращение таксономического разнообразия брахиопод. По одной из гипотез, в мезозое брахиоподы со слепо замкнутым кишечником не смогли восстановить свою численность из-за преобладания в планктоне панцирных одноклеточных водорослей. Мы предполагаем, что теребратулиды, которые являются самой распространенной группой среди современных брахиопод, смогли приспособиться к изменившемуся составу питания за счет более эффективного механизма фильтрации, характерного для плектолофного лофофора. Современные ринхонеллиды на конце кишечника имеют слепое расширение, которое, по-видимому, используется для измельчения и переваривания панцирного планктона.

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