PBDB Taxon

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

Paltechioceras tardecrescens

Cephalopoda - Ammonitida - Echioceratidae

Taxonomy

Ammonites tardecrescens was named by Buckman (1914). It is a 3D body fossil.

It was recombined as Paltechioceras tardecrescens by Blau (1998), Blau et al. (2000), Rakús and Guex (2002), Meister and Friebe (2003), Edmunds et al. (2003) and Vitón et al. (2024).

Sister species lacking formal opinion data

P. aplanatum, P. boehmi-favrei, P. harbledownense, P. harbledownensis, P. herbici, P. tardecescens

Synonyms

Caloceras aplanatum was named by Hyatt (1889).

It was synonymized subjectively with Paltechioceras tardecrescens by Blau (1998) and Blau et al. (2000).
Euechioceras insigne was named by Trueman and Williams (1925).

It was synonymized subjectively with Paltechioceras tardecrescens by Blau (1998) and Blau et al. (2000).

Synonymy list

Year	Name and author
1889	Caloceras aplanatum Hyatt p. 179 fig. 23,24
1925	Euechioceras insigne Trueman and Williams
1998	Paltechioceras tardecrescens Blau p. 212 figs. Pl 10, figs 1-6,9,15; pl 14, fig 4
2000	Paltechioceras tardecrescens Blau et al. p. 266 figs. 11.1-11.3, 11.5
2002	Paltechioceras tardecrescens Rakús and Guex p. 88 figs. Pl 13, figs 5,6,10; text-fig 69
2003	Paltechioceras tardecrescens Edmunds et al. fig. 5.2
2003	Paltechioceras tardecrescens Meister and Friebe
2024	Paltechioceras tardecrescens Vitón et al. p. 73 figs. 5, 6A-E, 7A

Is something missing? Join the Paleobiology Database and enter the data

Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Cephalopoda	Cuvier 1797

Rank	Name	Author
subclass	Ammonoidea	()
order	Ammonitida
suborder	Ammonitina	Hyatt 1889
superfamily	Psiloceratoidea	(Hyatt 1867)
family	Echioceratidae	Buckman 1913
genus	Paltechioceras	Buckman 1924
species	tardecrescens	(Buckman 1914)

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.

†Paltechioceras tardecrescens Buckman 1914

show all | hide all

Invalid names: Caloceras aplanatum Hyatt 1889 [synonym], Euechioceras insigne Trueman and Williams 1925 [synonym], Plesechioceras typus Buckman 1927 [synonym]

Diagnosis

No diagnoses are available

Measurements

part	N	mean	minimum	maximum	median	s.d.
shell height	6	9.34	4.60	15.1	10.6	4.54
shell diameter	6	36.0	18.9	65.0	37.9	18.5
shell inflation	6	18.6	10.2	40.5	17.5	13.6

Composition:

aragoniteo

Environment:

marinec

Locomotion:

fast-movingo

Life habit:

nektonico

Diet:

carnivoreo

Vision:

well-developedc

Created:

2005-01-28 02:27:03

Modified:

2009-10-08 14:14:55

Source: o = order, c = class

References: Kiessling 2004, Kiessling 2003

Age range: base of the Obtusum to the top of the Oxynotum or 196.50000 to 189.60000 Ma

Collections (67 total)

Time interval	Ma	Country or state	Original ID and collection number
Early/Lower Sinemurian - Late/Upper Sinemurian	196.5 - 189.6	Mexico (Hidalgo)	Paltechioceras tardecrescens (208369)
Late/Upper Sinemurian	196.5 - 189.6	France	Paltechioceras tardecrescens (199713 199720)
Late/Upper Sinemurian	196.5 - 189.6	Slovakia	Paltechioceras tardecrescens (195486)
Late/Upper Sinemurian	196.5 - 189.6	Morocco	Paltechioceras tardecrescens (200552 200605 200606 200617 200618 200619) Plesechioceras delicatum (200538 200550 200585 200587 200597 200610 200611)
Late/Upper Sinemurian	196.5 - 189.6	Mexico (Hidalgo)	Paltechioceras tardecrescens (208371 208514 208530 208549)
Obtusum - Raricostatum	196.5 - 189.6	Hungary (Veszprém Megye)	Plesechioceras delicatum (78410)
Oxynotum	196.5 - 189.6	Tunisia	Plesechioceras delicatum (170505)
Oxynotum - Raricostatum	196.5 - 189.6	Hungary (Veszprém Megye)	Plesechioceras delicatum (78408 81576)
Raricostatum	196.5 - 189.6	Germany	Paltechioceras tardecrescens (189120)
Raricostatum	196.5 - 189.6	Austria	Paltechioceras tardecrescens (189193 189194 189195 189196 189198 189199 189200)
Raricostatum	196.5 - 189.6	Portugal	Paltechioceras tardecrescens (237681 237682 237683 237684 237685 237699 237700 237701 237702 237703 237704 237705 237706 237709 237710 237713 237714 237732 237733 237735)
Raricostatum	196.5 - 189.6	United Kingdom (England)	Paltechioceras tardecrescens (33363 33364)
Raricostatum	196.5 - 189.6	Spain	Paltechioceras tardecrescens (133576 202206 237671 237674 237675 237676 237677 237678)
Raricostatum	196.5 - 189.6	France	Paltechioceras tardecrescens (159078)
Raricostatum	196.5 - 189.6	Tunisia	Paltechioceras tardecrescens (170513)
Late/Upper Sinemurian - Late/Upper Pliensbachian	196.5 - 183.0	Austria	Paltechioceras tardecrescens (218910 218932)