Algirosphaera

Cenozoic Taxa

Algirosphaera meteora

Edited by Lyndsey on Thu, 10/03/2011 - 11:18

Algirosphaera meteora (Muller 1972) Norris 1984 [Anthosphaera]

Coccosphere: monomorphic.

Coccoliths: broadly elliptical, with constriction around base of the spine; proximal surface lacks central irregular cycle.

Original description:

Geological Time Data

Geological Time Periods:

Quaternary

Biblio Reference:

Young, JR. 1998. Neogene. Calcareous nannofossil biostratigraphy. :225-265.

Notes on occurrence information:

A. meteora was described from Quaternary sediments, but rarely observed since

261 reads
Printer-friendly version
Neogene: Algirosphaera; Algirosphaera meteora
Paleogene: Algirosphaera

Algirosphaera Schlauder, 1945 emend. Norris, 1984

Edited by Scratchpad Team on Fri, 06/02/2009 - 12:13

Login or register to post comments
56 reads
Printer-friendly version
Neogene: Algirosphaera
Paleogene: Algirosphaera

Algirosphaera

Edited by Lyndsey on Thu, 10/03/2011 - 14:06

Algirosphaera Schlauder 1945 emend. Norris 1984

Coccosphere: monomorphic or with differentated CFCs.

Coccoliths: Rim and radial cycle show typical Rhabdosphaeraceae structure, but lamellar cycle is modified into/replaced by an elongate domal or double-lipped (labiatiform) protrusion, which is filled by fine rod-like elements. The species were often placed in Anthosphaera in the older literature (see Aubry 1999 for full discussion).

Remarks:

Type species: Anthosphaera oryza Schlauder 1954, which is a subjective junior synonym of Algirosphaera robusta (Lohman 1902).

Geological Time Data

Notes on occurrence information:

There are rare Neogene records of A. robusta and A. meteora and fossil species were recently described, from Tanzania, by Bown et al. (in press)

Login or register to post comments
870 reads
Printer-friendly version
Neogene: Algirosphaera; Algirosphaera robusta
Paleogene: Algirosphaera

Algirosphaera robusta

Edited by Lyndsey on Tue, 01/03/2011 - 16:58

Algirosphaera robusta (Lohmann 1902) Norris 1984 [Syracosphaera]

Coccosphere: Motile, dimorphic. Prominent flagellar opening surrounded by 3 CFCs with higher and wider protrusion.

Coccoliths: Base and protrusion elongate elliptical; protrusion has double-lipped form, especially in LM. Cycle of irregular laths covers proximal face of central area.

Original description:

Holococcolith phase: Combination coccospheres with Sphaerocalyptra quadridentata have been illustrated by Kamptner (1941) and Triantaphyllou & Dimiza (2003).

Synonyms:

Algirosphaera oryza Schlauder 1945;
Algirosphaera quadricornu (Schiller 1914) Norris 1984 [Syracosphaera];
Algirosphaera aurea (Bernard & Lecal 1960) [Anthosphaera];
Anthosphaera bicornu Schlauder 1945;

There are also others, see Kleijne (1992). Subdivisions on nature of circum-flagellar coccoliths, coccosphere shape, and shape of body coccoliths have been suggested but do not seem meaningful (Kleijne 1992, Probert et al., 2007).

Login or register to post comments
484 reads
Printer-friendly version
Neogene: Algirosphaera; Algirosphaera robusta; Syracosphaera
Paleogene: Algirosphaera

Image