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Pacitrigonia sobrali

Bivalvia - Trigoniida - Trigoniidae

Taxonomy
Pacitrigonia sobrali was named by Leanza and Casadío (1991). Its type specimen is GHUNLPam 399, a valve, and it is a 3D body fossil. Its type locality is Barda Baya, which is in a Maastrichtian marine limestone in the Roca Formation of Argentina.

Sister species lacking formal opinion data
P. de-stefanii, P. pampeana
Entered
by F. Aspromonte (authorized by E. Vlachos) on 2023-12-19

Synonymy list
YearName and author
1991Pacitrigonia sobrali Leanza and Casadío p. 28 figs. 1-3

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classBivalvia
RankNameAuthor
subclassAutobranchia(Groblen 1894)
infraclassHeteroconchia(Gray 1854)
subclassPalaeoheterodonta()
orderTrigoniida(Dall 1889)
superfamilyTrigonioidea(Lamarck 1819)
familyTrigoniidaeLamarck 1819
genusPacitrigoniaMarwick 1932
speciessobrali

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.

†Pacitrigonia sobrali Leanza and Casadío 1991
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Diagnosis
ReferenceDiagnosis
H. A. Leanza and S. Casadío 1991Large-sized inequilateral shell. Ornamented flank with fine and raised subconcentric ribs, subparallel to the ventral edge. Presence of undulations towards the posterior part of the valve, which may lead to elongated pustules. Narrow and shallow antecarinal groove, adorned only by striae. Well-defined marginal ridge extending halfway along the valve. Narrow area, adorned by weak radial ribs. Excavated umbo, exhibiting growth striae exclusively.
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: Ros-Franch et al. 2014, Aberhan et al. 2004

Age range: Maastrichtian or 72.20000 to 66.00000 Ma

Collections (5 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Maastrichtian72.2 - 66.0Argentina (La Pampa) Pacitrigonia sobrali (5167)
Maastrichtian72.2 - 66.0Argentina (Chubut) Pacitrigonia sobrali (74123)
Maastrichtian72.2 - 66.0Argentina (La Pampa) Pacitrigonia sobrali (type locality: 5169)
Maastrichtian72.2 - 66.0Argentina (Neuquen) Pacitrigonia sobrali (1347)
Maastrichtian72.2 - 66.0Argentina (Rio Negro) Pacitrigonia sobrali (240159)