The Academy of Natural Sciences, Philadelphia

Malacolog Version 4.1.1

A Database of Western Atlantic Marine Mollusca

The Academy of Natural Sciences, Philadelphia

Gastropoda: : Pyramidelloidea: Odostomiinae

Mumiola gradatula (Mörch, 1876)

Range: 28°N to 20.8°S; 87°W to 32.4°W
Depth: 0 to 238 m
Maximum Reported Size: 2.8  mm


Rissoa gradatula Mörch, 1876
Alvania gradatula (Mörch, 1876) 
Rissoa toroensis Olsson & McGinty, 1958
Odostomia toroensis (Olsson & McGinty, 1958) 
Chrysallida toroensis (Olsson & McGinty, 1958) 
Rissoina toroensis (Olsson & McGinty, 1958) 


Rissoa gradatula Mörch, 1876a, p. 53-54, [Faber 2005b, figs. 3-8]
[Basis of the current name]
Type Locality: St. Thomas
Range: 26°N to 20.8°S; 87°W to 32.4°W
Maximum Reported Size: 2.4 mm
Distribution: Honduras, Bahamas: Abaco (Great or Little); Turks and Caicos, Jamaica, Dominican Republic; Virgin Islands: St. Thomas, Tortola; Brazil: Fernando de Noronha, Pernambuco, Abrolhos Islands, Espirito Santo
References: Faber (2005b) cNWM; Pimenta, Absalao & Miyaji (2009) SE
Combining Genera:  Alvania

Rissoa toroensis Olsson & McGinty, 1958, p. 26, pl. 4, fig. 5
Type Locality: Bocas Island, Panama
Range: 28°N to 4°S; 83.07°W to 33.8°W
Depth: 0 to 238 m
Maximum Reported Size: 2.8 mm
Distribution: USA: Florida: West Florida; Costa Rica, Panama; ABC Islands: unlocalized; Brazil: Atol das Rocas
References: Houbrick (1968) dW; Jong & Coomans (1988); Faber & Moolenbeek (1999); Faber (2005b) s
Combining Genera:  Chrysallida Odostomia Rissoina

Partial List of References

Mörch, O. A. L. 1876. Synopsis molluscorum marinorum Indiarum occidentalium imprimis insularum danicarum Malakozoologische Blätter 23 45-58, 87-143.
Olsson, A. A. and T. L. McGinty. 1958. Recent marine mollusks from the Caribbean coast of Panama with the description of some new genera and species Bulletins of American Paleontology 39 1-58, pls. 1-5. [Stated date: 10 Dec 1958.]

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