Новый вид вымерших головоногих моллюсков — белемнитов — найден на полуострове Нордвик учеными Института нефтегазовой геологии и геофизики им. А.А. Трофимука Сибирского отделения РАН.
Белемниты — представители фауны юрского и мелового периодов, схожие с современными кальмарами, родственники осьминогов. Они имели вытянутое торпедообразное тело, крупные глаза — сложные, как у современных хищников, чернильный мешок — как у каракатиц — для защиты; использовали реактивный принцип перемещения: набирали воду в мантию и выбрасывали ее с силой. Внутри моллюск имел известковый стержень, помогавший держать равновесие при движении. Некоторые виды белемнитов достигали 4 м длины. Были хищниками, охотились на рыб и других моллюсков.
Что в итоге? Возраст нового вида белемнитов, исследованного геохимическими методами, определен в 139 млн лет, что на 6 млн лет древнее, чем считалось ранее для данного геологического слоя.
Теперь его необходимо датировать берриасским веком.
Это изменение датировок позволило ученым заново оценить возраст и видовой состав древних организмов из мелового периода с полуострова Нордвик.
Слева – Lagonibelus pseudonecopinus Efremenko, sp. nov.; справа: Фиг. 1–4. Buchia okensis (Pavlow, 1907); Фиг. 5–14. Buchia volgensis (Lahusen, 1888); Фиг. 15. Pachyteuthis acuta (Blüthgen, 1936); Фиг. 16. Arctoteuthis repentina (Sachs et Nalnjaeva, 1964); Фиг. 17. Lagonibelus necopinus (Gustomesov, 1960)
Источник: официальный канал Министерства науки и высшего образования РФ в мессенджере MAX (https://max.ru/minobrnauki/AZ7zR3u0Fk4)
Иллюстрации предоставлены сотрудниками ИНГГ СО РАН
Подробнее об исследовании – в научной статье:
Дзюба О.С., Ефременко В.Д., Урман О.С., Шурыгин Б.Н., Игольников А.Е., Ян П.А. – Уточнение возраста и видового состава некоторых раннемеловых белемнитов севера Восточной Сибири (п-ов Нордвик) // Палеонтологический журнал – № 1 – С. 44-52 – 2026
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