Naslov
New Dasyclads from the Anisian of Lika (Croatia)

Autori
Grgasović, Tonči ; Sokač, Branko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
5th Regional Symposium of the International Fossil Algae Association, Abstracts / Fugagnoli, Anna ; Bassi, Davide - Ferrara : Museologia Scientifica e Naturalistica, Ferrara, 2005

Skup
5th Regional Symposium of the International Fossil Algae Association

Mjesto i datum
Ferrara, Italija, 30.08.2005. - 31.08.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Dasycladales; Triassic; Croatia

Sažetak
Two new species of dasycladal algae are described from the Anisian limestone of Lika region in Croatia. The first one is Anisoporella susnjara n. sp. dedicated to the memory on our colleague Ante Šušnjara from Zagreb. It is characterized by very small cylindrical thallus and vesiculiferous branches arranged in close whorls. In consecutive whorls branches are positioned one above the other. Dimensions: D=0, 25-0, 32mm, d=0, 10-12mm, d/D=0, 36-0, 44, h=0, 05-0, 06, p=0, 04, w=12-14, α =90 o. It differs from other species by smaller dimensions and arrangement of the branches. Anisoporella occidentalis BOTTERON has much larger thallus with relatively thin calcareous sheet, and more spaced whorls. Branches in a whorl have chevron-like arrangement. A. anisica (ZANIN BURI) also has larger thallus with wider central cavity, and more spaced whorls made of two rows of branches, as in Oligoporella PIA. The new species has been found with typical Anisian assemblage: algae Macroporella alpina PIA, Poncetella helvetica (PIA) and Pseudodiplopora proba (PIA), as well as foraminifera Meandrospira dinarica KOCHANSKY-DEVIDÉ & PANTIĆ and Pilammina densa PANTIĆ. The second one is Palaeodasycladus primus n. sp., named after being the oldest representative of the genus (latin primus = the first one). Unfortunately, there is only one specimen of the new taxon, so description can not be detailed. P. primus has cylindrical thallus with whorls of inclined branches up to third order. Primary branches are not completely calcified, producing so called intusannulation. Trichophorous or tubular secondary branches bear bundles of thin, probably trichophorous, tertiary branches. Dimensions: D=1, 82mm, d=0, 36mm, d/D=0, 20, h=0, 71mm, p=0, 23mm, l=0, 34mm, w=?11, p'=0, 09mm, l'=0, 54mm, w'=?3, p''=0, 05mm, l''=0, 32mm, w''=?4-5, α =54o. Distinguishing from the Jurassic taxa of the genus is not easy, due to the high morphological variability of the genus Palaeodasycladus. The most similar is P. mediterraneus (PIA), that differs by phloiophorous secondary and tertiary branches. The new species has been found with typical Anisian assemblage: algae Teutloporella tabulata PIA, Macroporella alpina PIA and Scinderella scopuliformis GRGASOVIĆ & SOKAČ, as well as foraminifera Meandrospira dinarica KOCHANSKY-DEVIDÉ & PANTIĆ.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA