PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Modiolus (Modiolus) fountainensis

Bivalvia - Mytilida - Mytilidae

Taxonomy

Modiola fountainensis was named by Weller (1916). It is a 3D body fossil.

It was recombined as Modiolus (Modiolus) fountainensis by Hoare (2007).

Synonymy list

Year	Name and author
1916	Modiola fountainensis Weller pp. 251 - 252 figs. pl. 16 f. 19
2007	Modiolus (Modiolus) fountainensis Hoare p. 71 figs. 3.12 – 3.23

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Bivalvia
—	Eubivalvia

Rank	Name	Author
subclass	Autobranchia	(Groblen 1894)
infraclass	Pteriomorphia	(Beurlen 1944)
—	Mytilomorphi	Ferussac 1822
order	Mytilida	(Rafinesque 1815)
superfamily	Mytiloidea	Rafinesque 1815
family	Mytilidae	Rafinesque 1815
genus	Modiolus	(Lamarck 1801)
subgenus	Modiolus	Lamarck 1799
species	fountainensis	()

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Modiolus (Modiolus) fountainensis Weller 1916

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Diagnosis

Reference	Diagnosis
R. D. Hoare 2007	Small, thin shelled, narrowly elongately spatulate in form; beaks near anterior margin, not prominent; dorsal margin straight before curving with broad convexity into narrowly convex posterior margin; ventral margin nearly straight; anterior margin short, convex; surface with only faint comarginal growth lines; interior features not observed. Specimens range in size from 14.3 mm long, 6.2 mm high to 7.3 mm long, 3.7 mm high. The narrow, elongate shape and less prominent comarginal ornamentation distinguish M. (M.)fountainensis from other species of the subgenus.