Home Plot Diversity Curves Tree of Life About Admin Login

Welcome to the Treatise on Invertebrate Paleontology!

Please enter a genera name to retrieve more information.

Search By:
and Class
and Order

Nonion

Classification

    Phylum:  
Protista
    Subphylum:  
Sarcodina
    Class:  
Reticularea
    Subclass:  
Granuloreticulosia
    Order:  
Foraminiferida
    Suborder:  
Rotalina
    Superfamily:  
Cassidulinacea
    Family:  
Nonionidae
    Subfamily:  
Nonioninae
    Formal Genus Name and Reference:  
Nonion de MONTFORT, 1808, *1305, p. 210
    Type Species:  
Nautilus incrassatus Fichtel & MOLL, 1798, *716, p. 38, OD


Images

(Click to enlarge in a new window)
Fig. 612,1. *N. incrassatus (Fichtel & Moll), Mio., Albania, 1a,b, side, edge views, X100 (*2019).


Synonyms

Nonionia


Geographic Distribution

cosmop


Age Range

    Beginning Stage in Treatise Usage:  
U.Cret., Paleoc.
    Beginning International Stage:  
Cenomanian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
100.5
    Ending Stage in Treatise Usage:  
Rec.
    Ending International Stage:  
Meghalayan
    Fraction Up In Ending Stage:  
100
    Ending Date:  
0


Description

Test free, planispiral and involute, slightly compressed, biumbonate, periphery rounded, peripheral outline lobulate, chambers numerous, increasing gradually in size as added, sutures distinct, depressed, radial, slightly curved, wall calcareous, finely perforate, granular in structure, surface smooth, umbonal region filled with secondarily deposited calcite, either as granules or solid boss, aperture an arched, equatorial, interiomarginal slit. [Differs from Melonis in having a filled, rather than open, umbilicus, thinner and more finely perforate and monolamellar walls (*1530). Many species previously included in Nonion should be referred to Melonis or Florilus.)




References

Montfort, Denys de, 1808, Conchyliologie systématique et classification methodique des coquilles: v. 1, 1xxxvii+409 p.


Museum or Author Information