PBDB Taxon

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

Megatrigonia (Apiotrigonia) condoni

Bivalvia - Trigoniida - Trigoniidae

Taxonomy

Trigonia condoni was named by Packard (1921). Its type specimen is Condom Museum type number 3, a shell, and it is a 3D body fossil.

It was recombined as Megatrigonia (Apiotrigonia) condoni by Jones (1960).

Sister species lacking formal opinion data

Apiotrigonia minor, Apiotrigonia postonodosa, Apiotrigonia minor, Apiotrigonia postonodosa, Apiotrigonia granosa, Apiotrigonia himenourensis, M. longa, M. turkestanensis

Synonyms

Trigonia packardi was named by Anderson (1958). It is a 3D body fossil. Its type locality is CAS loc. 1345, Texas Springs, on road leading to Centerville, which is in an Albian marine horizon in the Budden Canyon Formation of California.

It was synonymized subjectively with Megatrigonia (Apiotrigonia) condoni by Jones (1960).

Synonymy list

Year	Name and author
1921	Trigonia condoni Packard p. 28 figs. pl. 8, fig. 2
1958	Trigonia packardi Anderson p. 108 figs. pl. 1, fig. 5
1960	Megatrigonia (Apiotrigonia) condoni Jones p. 158

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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)

Rank	Name	Author
infraclass	Heteroconchia	(Gray 1854)
—	Uniomorphi	Gray 1854
—	Unioni	Gray 1854
—	Unionata	Gray 1854
order	Trigoniida	(Dall 1889)
superfamily	Trigonioidea	(Lamarck 1819)
family	Trigoniidae	Lamarck 1819
genus	Megatrigonia	van Hoepen 1929
subgenus	Apiotrigonia
species	condoni	()

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.

†Megatrigonia (Apiotrigonia) condoni Packard 1921

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Invalid names: Trigonia packardi Anderson 1958 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

aragonitef

Environment:

marinef

Locomotion:

fast-movingf

Life habit:

shallow infaunalf

Diet:

suspension feederf

Vision:

blindf

Created:

2025-05-16 13:05:25

Modified:

2025-05-16 13:05:25

Source: f = family

References: Aberhan et al. 2004, Ros-Franch et al. 2014

Age range: base of the Early/Lower Albian to the top of the Cenomanian or 113.20000 to 93.90000 Ma

Collections (9 total)

Time interval	Ma	Country or state	Original ID and collection number
Early/Lower Albian	113.2 - 110.1	USA (California)	Trigonia packardi (176021)
Early/Lower Albian	113.2 - 110.1	USA (Oregon)	Megatrigonia condoni (88612 88615)
Albian	113.2 - 100.5	USA (Oregon)	Megatrigonia condoni (88611 88613 88614 88616 88617)
Cenomanian	100.5 - 93.9	USA (California)	Apiotrigonia condoni (220368)