- Tytuł:
- A crustoid graptolite lithoimmured inside a Middle Ordovician nautiloid conch from northern Estonia
- Autorzy:
-
Vinn, Olev
Wilson, Mark A.
Toom, Ursula - Powiązania:
- https://bibliotekanauki.pl/articles/191686.pdf
- Data publikacji:
- 2019
- Wydawca:
- Polskie Towarzystwo Geologiczne
- Tematy:
-
Encrustation
graptolites
nautiloids
cryptic fauna
Darriwilian
Baltica - Opis:
- A light grey nautiloid conch has a dark brown colony attached to its internal surface. This colonial fossil resembles hederellids and bryozoans, but is in fact a crustoid graptolite (Hormograptus? sp.). The colony has been lithoimmured inside this nautiloid conch by early cementation. Crustoid graptolites were a part of the encrusting communities in the Middle Ordovician of Baltica, but their abundance among encrusters of biogenic substrates reached a peak in the middle Sandbian. The cryptic mode of life appeared very early in the evolution of the crus- toids. The discovery of this crustoid graptolite in a nautiloid conch indicates that the Baltic Middle Ordovician cryptic communities were taxonomically more diverse than was known previously. The nautiloid conch studied is sparsely encrusted with an encrustation density that is similar to those of other Middle Ordovician cryptic surfaces described from Estonia.
- Źródło:
-
Annales Societatis Geologorum Poloniae; 2019, 89, 3; 285-290
0208-9068 - Pojawia się w:
- Annales Societatis Geologorum Poloniae
- Dostawca treści:
- Biblioteka Nauki
Artykuł