- Tytuł:
- Aszulcicrinus, a new genus of the Triassic crinoid family Dadocrinidae (Articulata; Encrinida) from Poland
- Autorzy:
- Hagdorn, Hans
- Powiązania:
- https://bibliotekanauki.pl/articles/1836258.pdf
- Data publikacji:
- 2020
- Wydawca:
- Polskie Towarzystwo Geologiczne
- Tematy:
-
Crinoidea
Middle Triassic
early Anisian
Upper Silesia
functional morphology
taphonomy - Opis:
- The new genus and species Aszulcicrinus pentebrachiatus of the family Dadocrinidae from the ear-ly Middle Triassic Lower Gogolin Formation of Upper Silesia Upland is described. In contrast to Dadocrinus, the second primibrachial of Aszulcicrinus is not axillary for articulation with two arms but articulates with a third primibrachial and the first pinnule. This character results in five unbranched arms, which is unique in the order Encrinida. The significance of this character is discussed and paedomorphic or ecophenotypic explanations are excluded. The presence of only five unbranched arms predominates through the ontogeneny of Aszulcicrinus from early postlarval to adult stage. Within the family Dadocrinidae (Aszulcicrinus - Dadocrinus - Carnallicrinus), a phylogenetic trend towards size increase coincident with increasing arm number and denser pinnulation is inter-preted as an improvement in filter-feeding efficiency. The sedimentological and taphonomic setting of the obru-tional conservation lagerstätte of the type locality is described.
- Źródło:
-
Annales Societatis Geologorum Poloniae; 2020, 90, 4; 381-390
0208-9068 - Pojawia się w:
- Annales Societatis Geologorum Poloniae
- Dostawca treści:
- Biblioteka Nauki
Artykuł