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Echinoidea source details

Smith, A. B. & Crame, J. A. 2012. Echinoderm faunas from the Lower Cretaceous (Aptian-Albian) of Alexander Island, Antarctica. Palaeontology 55, 305-324.
163858
10.1111/j.1475-4983.2012.01129.x [view]
Smith, A. B.; Crame, J. A.
2012
Echinoderm faunas from the Lower Cretaceous (Aptian-Albian) of Alexander Island, Antarctica
Palaeontology
55(2), 305-324
Publication
Strata assigned to the Fossil Bluff Group on Alexander Island, Antarctica, contain Aptian to Albian highlatitude echinoderm faunas that lived at palaeolatitudes greater than 60 degrees south. The Pluto Glacier Formation, of essentially Aptian age, yields a deep-water assemblage that includes two ophiuroids, an ophiacanthid and a representative of the ophiolepidid genus Mesophiomusium, both represented by partially articulated specimens. The echinoid fauna includes a new genus of diadematoid, Australidiadema, and a new genus of disasteroid, Notidisaster, which extend the record of both groups into the southern hemisphere. The overlying Neptune Glacier Formation, of late Albian age, yields only spatangoids which are common but rarely well enough preserved to be identified even to genus level, although at least some belong to the genus Hemiaster. Key words: Cretaceous, Aptian–Albian, ophiuroids, echinoids, new taxa, taxonomy, Antarctica.
Antarctic
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 Diagnosis

Test thin-plated; weakly imbricate especially adapically; interambulacral plates with primary tubercle and smaller ... [details]

 Diagnosis

Test thin-plated; weakly imbricate especially adapically; interambulacral plates with primary tubercle and smaller ... [details]

 Diagnosis

Test thin-plated; ovate in outline. Apical disc strongly disjunct with large interambulacral plates separating bivium ... [details]

 Diagnosis

Test thin-plated; ovate in outline. Apical disc strongly disjunct with large interambulacral plates separating bivium ... [details]

 Etymology

From the Latin australis (= southern) & -diadema [common suffix for diadematoids] [details]

 Etymology

After Alexander Island, where the material comes from. [details]

 Etymology

In honour of B.J. Taylor, for his pioneering work on the echinoderms of Antarctica. [details]

 Etymology

From the Greek notia (= southern) and -disaster [from Disaster a basal atelostomate echinoid] [details]

 Etymology

From the Latin subitus, meanin unexpected [details]

 Fossil range

Albian-Aptian [details]

 Stratigraphy

Pluto Glacier Formation, Fossil Bluff Group [details]

 Stratigraphy

Pluto Glacier Formation and Neptune Glacier Formation, Fossil Bluff Group [details]

 Stratigraphy

Pluto Glacier Formation, Fossil Bluff Group [details]

 Taxonomy

Attribution to a specific family of stem-group Atelostomata uncertain [details]

 Type locality

Keystone Cliffs and Fossil Bluff, Alexander Island, Antarctica [details]

 Type locality

Tethys Nunataks, Fossil Bluff and Mount Phoebe, Alexander Island, Antarctica [details]

 Type locality

Mount Phoebe, Mount Ariel, Fossil Bluff and Keystone Cliffs, Alexander Island, Antarctica [details]

 Type material

British Antarctic Survey (BAS) HT: BAS KG.1681.14 [part & counterpart]; PT: BAS KG.1681.15, KG.1743.23b, KG.1744.38 [details]

 Type material

British Antarctic Survey (BAS) HT: BAS KG1616.9; PT: BAS KG1616.10, KG3.127 [details]

 Type material

British Antarctic Survey (BAS) HT: BAS KG.1676.11; PT: BAS KG.2.127, KG.17.26, KG.1676.3, KG.1676.4 [details]


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