PBDB Taxon

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

Pachecoa

Bivalvia - Arcida - Arcidae

Taxonomy

Pachecoa was named by Harris (1919) [Sepkoski's age data: T Eo-l T Eo-u Sepkoski's reference number: 700]. It is not extant.

It was assigned to Trinacriinae by Vokes (1980) and Moore (1983); and to Arcoida by Sepkoski (2002).

Species

P. (Pachecoa), P. (Stenzelia), P. decisa, P. declivis, P. ellipsis, P. hornii, P. pulcra, P. sabinica

Species lacking formal opinion data

P. concentrica, P. decisca, P. ovalis

Synonymy list

Year	Name and author
1919	Pachecoa Harris
1980	Pachecoa Vokes p. 18
1983	Pachecoa Moore p. A48
2002	Pachecoa Sepkoski

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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	Pteriomorphia	(Beurlen 1944)
—	Ostreomorphi	Ferussac 1822
—	Arcioni	Gray 1854
order	Arcida	(Stoliczka 1871)
superfamily	Arcoidea	(Lamarck 1809)
family	Arcidae	Lamarck 1809
subfamily	Noetiinae	Stewart 1930
tribe	Trinacriini	(MacNeil 1937)
genus	Pachecoa	Harris 1919

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. †Pachecoa Harris 1919

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Subg. †Pachecoa (Pachecoa)

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†Pachecoa (Pachecoa) decisa Conrad 1833

†Pachecoa (Pachecoa) hornii elusa Clark and Woodford 1927

Subg. †Pachecoa (Stenzelia) MacNeil 1954

†Pachecoa decisa

†Pachecoa declivis

†Pachecoa ellipsis

†Pachecoa hornii Gabb 1864

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†Halonanus hornii hornii Gabb 1864

†Pachecoa pulcra Gabb 1860

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†Pachecoa (Pachecoa) pulcra Gabb 1860

†Pachecoa sabinica Harris 1919

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†Pachecoa (Pachecoa) sabinica Harris 1919

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

aragonitef

Entire body:

yesf

Adult length:

10 to < 100f

Adult width:

10 to < 100f

Adult height:

10 to < 100f

Thickness:

intermediatef

Folds:

minorf

Ribbing:

majorf

Spines:

nonef

Internal reinforcement:

nonef

Ontogeny:

accretionf

Environment:

lagoonal, coastal, inner shelf, outer shelf, oceanic, brackish, freshwaterf

Locomotion:

facultatively mobilef

Attached:

yesf

Life habit:

epifaunalf

Diet:

suspension feederf

Vision:

limitedf

Created:

2008-11-18 16:46:55

Modified:

2010-02-18 01:07:43

Source: f = family

Reference: Mikkelsen and Bieler 2008

Age range: base of the Early/Lower Eocene to the top of the Bartonian or 55.80000 to 38.00000 Ma

Collections (143 total)

Time interval	Ma	Country or state	Original ID and collection number
Ypresian	56.0 - 47.8	USA (California)	Arca hornii (52426 52428 52429 52430 52434 122294 122337) Trigonodesma hornii (122656)
Ypresian	56.0 - 47.8	USA (Alabama)	P. microcancellata (90609 92375)
Ypresian	56.0 - 47.8	USA (Texas)	P. concentrica (7788 7789 83950) P. microcancellata (91844) P. ovalis (89949) P. pulchra (98709 98746)
Ypresian - Lutetian	56.0 - 41.3	USA (Alabama)	P. catonis (83757 83802 90602) P. catonis, P. sp. (83804)
Ypresian - Bartonian	56.0 - 38.0	USA (Texas)	P. pulchra (98838 99029)
Eocene	56.0 - 33.9	USA (California)	Arca hornii (91476 207112)
Early/Lower Eocene - Middle Eocene	55.8 - 37.71	USA (Texas)	P. pulchra (91106)
Lutetian	47.8 - 41.3	USA (Oregon)	Halonanus hornii (201035)
Lutetian	47.8 - 41.3	USA (Texas)	P. adamsi (90888) P. concentrica (205520 205521 205533) P. pulchra (92226 98839) P. pulchra, P. smithvillensis (90455) P. smithvillensis (205442 205496 205527 205532 205544) P. sp. (205436 205440 205454) P. sp., P. smithvillensis (205503)
Lutetian	47.8 - 41.3	USA (South Carolina)	P. sp. (52344)
Lutetian	47.8 - 41.3	USA (California)	P. hornii (200737 200754 200763 200764 200766) Trigonodesma hornii (202094)
Lutetian	47.8 - 41.3	USA (Alabama)	P. decisa (1436 1437 1438 1439 1442 1443 1444) P. declivis (81211 81258) P. ellipsis (81254) P. lisbonensis (81238) P. ovalis, P. declivis (81253) P. pulchra, P. declivis, P. ellipsis (81224) P. sp. (1441) P. sp., P. decisa (1440) P. sp., P. decisa, P. declivis (1435)
Lutetian	47.8 - 41.3	USA (Mississippi)	P. catonis (2414) P. declivis (99673)
Lutetian	47.8 - 41.3	USA (Virginia)	P. sp., P. decisa, P. ellipsis (1445 1446 1447 1448)
Lutetian - Bartonian	47.8 - 38.0	USA (Louisiana)	P. pulchra (90470)
Lutetian - Bartonian	47.8 - 38.0	USA (Texas)	P. pulchra (41439 41441) P. pulchra, P. sabinica (41426 41436 41443) P. sabinica (2412 2413 41433)
Lutetian - Bartonian	47.8 - 38.0	USA (Alabama)	P. declivis (205439) P. declivis, P. pulchra (205420) P. sp., P. pulchra (205490)
Bartonian	41.3 - 38.0	USA (Alabama)	P. ellipsis, P. ledoides, P. pectuncularis, P. decisa, P. perplana (90600) P. lisbonensis, P. declivis, P. ellipsis, P. decisa (90469) P. ovalis (205489) P. ovalis, P. declivis, P. decisa (98355) P. perplana (205438) P. pulchra (2453 2454) P. sp. (2416 2417 2418 2419 2420 2421 2422 2443 6788)
Bartonian	41.3 - 38.0	USA (Texas)	P. decisa (90886 91839 98729 99035 205267 205480 205481 205531) P. decisca, P. pulchra (205430) P. ellipsis (205429) P. ovalis, P. sp., P. decisa (205483) P. pulchra (90656 91797 91838 91895 92208 98868 99027 205410) P. pulchra, P. sabinica (41427) P. sabinica (7437 7439 99039) P. sabinica, P. pulchra (7438) P. sp. (205433 205515) P. sp., P. pulchra (205414 205415 205485) P. sp., P. sabinica, P. ellipsis, P. pulchra (205422)
Bartonian	41.3 - 38.0	USA (Arkansas)	P. corvamnis (99180)
Bartonian	41.3 - 38.0	USA (Mississippi)	P. declivis (90709) P. pulchra (2451)
Bartonian	41.3 - 38.0	USA (California)	Halonanus horni (52803 52827)
Bartonian	41.3 - 38.0	USA (Louisiana)	P. decisa (92272 92356) P. ellipsis (98771) P. pulchra (98769)
Bartonian	41.3 - 38.0	USA (South Carolina)	P. ellipsis, P. ledoides, Trinacria decisa, P. decisa (92308) P. ledoides, Trinacria decisa (92355) P. pulchra (92378) Trigonarca decisa (92487)