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Lockhartia

Classification

    Phylum:  
Protista
    Subphylum:  
Sarcodina
    Class:  
Reticularea
    Subclass:  
Granuloreticulosia
    Order:  
Foraminiferida
    Suborder:  
Rotalina
    Superfamily:  
Rotaliacea
    Family:  
Rotaliidae
    Subfamily:  
Rotaliinae
    Formal Genus Name and Reference:  
Lockhartia DAVIES, 1932, *561, p. 406
    Type Species:  
Dictyoconoides haimei DAVIES, 1927, *559, p. 280, OD


Images

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Fig. 485,1-3. *L. haimei (DAVIES), Paleoc., India; 1a-c, opposite sides and edge view of topotype, X26 (*2117); 2, axial sec. showing umbilical pillars, X30; 3, diagram. sec. (*561)


Synonyms



Geographic Distribution

Asia(lndia-Arabia-Iraq)-E. Afr.-S. Am.


Age Range

    Beginning Stage in Treatise Usage:  
Paleoc.
    Beginning International Stage:  
Danian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
66.04
    Ending Stage in Treatise Usage:  
M.Eoc.
    Ending International Stage:  
Bartonian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
37.71


Description

Test conical to lenticular, trochospiral, chambers forming outer layer of cone, leaving wide umbilical area, chamber walls curving inward toward umbilicus leaving open only marginal slit which opens into cavity between outer wall laminae may result in irregular buttresses or pillars, which fill umbilical area, appearing as granules at umbilical surface, may be labyrinthic; wall calcareous, of laminated radially fibrous calcite, coarsely perforate, aperture an interiomarginal slit. [Lockhartia has numerous intercommunicating umbilical cavities into which the cortical chambers open, and which open to the exterior as large pores on the umbilical side. Rotalia differs in having a solid umbilical plug or fissured one with a spiral canal beneath the chambers and tributary canals connecting to them. Dictyoconoides is similar to Lockhartia, but has intercalary whorls into the spire.]




References



Museum or Author Information