Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Semiinvoluta
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Cassidulinacea
Family:
Involutinidae
Formal Genus Name and Reference:
Semiinvoluta KRISTAN, 1957, *1057, p. 276
Type Species:
S. clari, OD
Images
(Click to enlarge in a new window)
Fig. 609,1-3. *S. clari, 1a-c, opposite sides and edge views of holotype, 2 , axial sec., 3 , equat. sec., all X35 (*1057)
Synonyms
Geographic Distribution
Aus.
Age Range
Beginning Stage in Treatise Usage:
U.Trias.(Rhaet.)
Beginning International Stage:
Rhaetian
Fraction Up In Beginning Stage:
0
Beginning Date:
205.74
Ending Stage in Treatise Usage:
U.Trias.(Rhaet.)
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Intermediate in character between Trocholina and Involutina, test similar to Trocholina in having umbilical pillars on one side only but with coiling nearly planispiral, as in Involutina, and with secondary thickening also on spiral side, aperture at open end of tube
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Cassidulinacea
Family:
Involutinidae
Formal Genus Name and Reference:
Semiinvoluta KRISTAN, 1957, *1057, p. 276
Type Species:
S. clari, OD
Images
(Click to enlarge in a new window)
Fig. 609,1-3. *S. clari, 1a-c, opposite sides and edge views of holotype, 2 , axial sec., 3 , equat. sec., all X35 (*1057)
Synonyms
Geographic Distribution
Aus.
Age Range
Beginning Stage in Treatise Usage:
U.Trias.(Rhaet.)
Beginning International Stage:
Rhaetian
Fraction Up In Beginning Stage:
0
Beginning Date:
205.74
Ending Stage in Treatise Usage:
U.Trias.(Rhaet.)
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Intermediate in character between Trocholina and Involutina, test similar to Trocholina in having umbilical pillars on one side only but with coiling nearly planispiral, as in Involutina, and with secondary thickening also on spiral side, aperture at open end of tube