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Trocholina

Classification

    Phylum:  
Protista
    Subphylum:  
Sarcodina
    Class:  
Reticularea
    Subclass:  
Granuloreticulosia
    Order:  
Foraminiferida
    Suborder:  
Rotalina
    Superfamily:  
Cassidulinacea
    Family:  
Involutinidae
    Formal Genus Name and Reference:  
Trocholina PAALZOW, 1922, *1404, p. 10
    Type Species:  
Involutina conica Schlumberger, 1898, *1659, p. 151, SD CUSHMAN, 1933, *461, p. 234


Images

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Fig. 610,1,2. *T . conica (SCHLUMBERGER), M.Jur., Ger. (1), M.Jur.(Bathon.), Fr. (2); 1a-c, spiral, umbilical, and edge views, X 66 (*2117); 2, axial sec. of holotype, X113 (*1525). - -Fig. 610,3,4. T. valdensis (REICHEL), L.Cret.(Valangin.), Switz.; 3a,b, umbilical and edge views, X64 ('1525); 4, axial sec. showing umbilical pillars, X66 (*1525). -- Fig. 610,5-7. T. crassa KRISTAN, U.Trias.(Rhaet.), Eu.(Aus.); 5, umbilical view; 6, edge view of different specimen; 7, axial sec.; all X24 (*1057)


Synonyms

Neotrocholina


Geographic Distribution

Eu.-USA-Carib.-Afr.- M.East


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.Cret.( Cenoman.)
    Ending International Stage:  
Cenomanian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
93.9


Description

Test free, conical, consisting of globular proloculus and spirally enrolled tubular second chamber, which is dorsally evolute with all whorls visible, ventral umbilical region completely filled with coarse calcite crystals, appearing as irregularly arranged pillars, nodes or beads on surface; wall calcareous, dorsally coarsely perforate, ventrally more finely perforate, granular in structure, surface smooth or with elevated spiral suture, ventral surface of final whorl may show somewhat curved faint growth striae, which end in pustules at umbilical margin; aperture at open end of tube.




References



Museum or Author Information