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Melonis

Classification

    Phylum:  
Protista
    Subphylum:  
Sarcodina
    Class:  
Reticularea
    Subclass:  
Granuloreticulosia
    Order:  
Foraminiferida
    Suborder:  
Rotalina
    Superfamily:  
Cassidulinacea
    Family:  
Anomalinidae
    Subfamily:  
Anomalininae
    Formal Genus Name and Reference:  
Melonis de MONTFORT, 1808, *1305, p. 66
    Type Species:  
Metmscus=Nautilus pompilioides FICHTEL & MOLL, 1798, *716, p. 31; OD


Images

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Fig. 627,1. *M. pompilioides (Fichtel & Moll), Plio., Eu.(Albania), 1a,b, side, edge views, X100 (*2019). -- Fig. 627,2,3. M. zaandami (van Voorthuysen), Rec., Greenl., 2a,b, 3a,b, side and apert. views, X75 (*1162).


Synonyms

Melossis


Geographic Distribution

cosmop.


Age Range

    Beginning Stage in Treatise Usage:  
U.Cret.(Maastricht.), Paleoc.
    Beginning International Stage:  
Maastrichtian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
72.17
    Ending Stage in Treatise Usage:  
Rec.
    Ending International Stage:  
Meghalayan
    Fraction Up In Ending Stage:  
100
    Ending Date:  
0


Description

Test free, early stage slightly trochospiral, adult planispiral, symmetrical and involute, deeply biumbilicate, with umbilicus commonly bordered by rim of nonperforate skeletal material, periphery broadly rounded; about 9 to 12 chambers per whorl; sutures flush to slightly depressed, radiate, straight to slightly curved, septa double, bilamellar (*946); wall calcareous, coarsely perforate, granular in structure, apertural face, septa, and umbilical thickened rim imperforate, surface smooth; aperture an elongate interiomarginal, equatorial slit, extending laterally to umbilicus on both sides of test.




References

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


Museum or Author Information