PBDB Taxon

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

Eoanditrigonia

Bivalvia - Trigoniida - Megatrigoniidae

Taxonomy

Anditrigonia (Eoanditrigonia) was named by Leanza (1993). Its type is Trigonia literata keideli.

It was reranked as Eoanditrigonia by Cooper and Leanza (2019).

It was assigned to Anditrigonia by Leanza (1993); and to Megatrigoniinae by Cooper and Leanza (2019).

Subtaxa

Anditrigonia (Eoanditrigonia) keideli, E. chacaicoensis

Synonymy list

Year	Name and author
1993	Anditrigonia (Eoanditrigonia) Leanza pp. 46 - 47
2019	Eoanditrigonia Cooper and Leanza pp. 22 - 23

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Bivalvia
—	Eubivalvia
subclass	Autobranchia	(Groblen 1894)
infraclass	Heteroconchia	(Gray 1854)

Rank	Name	Author
—	Uniomorphi	Gray 1854
—	Unioni	Gray 1854
—	Unionata	Gray 1854
order	Trigoniida	(Dall 1889)
superfamily	Myophorelloidea	(Kobayashi 1954)
—	Megatrigonioidae	van Hoepen 1929
—	Megatrigoniitae	van Hoepen 1929
family	Megatrigoniidae	van Hoepen 1929
subfamily	Megatrigoniinae	van Hoepen 1929
genus	Eoanditrigonia	()

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.

G. †Eoanditrigonia Leanza 1993

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†Anditrigonia (Eoanditrigonia) keideli Weaver 1931

†Eoanditrigonia chacaicoensis Lambert 1944

Diagnosis

Reference	Diagnosis
H. A. Leanza 1993	Shell medium to large in size, pyriform. Umbones prominent, very anteriorly located. Anterior flank ornamented by up to 40, very narrow, subconcentric costae that form on the posterior flank a ventrally directed V- or L-shaped inflection with a posterior set of costae. But these are fewer, thicker, and in inverse relation to those of Anditrigonia sensu stricto. Area narrow and smooth, with submedian groove. Marginal carina only defined in the umbonal region. Escutcheon narrow and smooth.

Measurements

No measurements are available

Composition:

aragonitec

Locomotion:

facultatively mobileo

Life habit:

infaunalo

Diet:

suspension feedero

Vision:

blindc

Created:

2004-02-28 12:34:20

Modified:

2004-02-28 14:34:20

Source: o = order, c = class

Reference: Aberhan et al. 2004

Age range: Early/Lower Bajocian or 170.90000 to 168.60000 Ma

Collections: one only

Time interval	Ma	Country or state	Original ID and collection number
Early/Lower Bajocian	170.9 - 168.6	Argentina	Anditrigonia keideli (25416)