PBDB Taxon

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Plagiochasma

Echinoidea - Nucleolitidae

Taxonomy

Plagiochasma is a genus. It is not extant.

It was assigned to Nucleolitidae by Kier (1962) and Kier (1966); and to Cassiduloida by Sepkoski (2002).

Species

P. cruciferum (syn. Nucleolites analis, Pyrina freucheni, Trematopygus analis), P. lammersmaxi, P. olfersii, P. orientalis

Synonyms

Trematopygus was named by d'Orbigny (1857).

It was synonymized objectively with Plagiochasma by Smith (2009).

It was assigned to Nucleolitidae by Clark and Twitchell (1915); and to Echinoneidae by Cooke (1942).
Dochmostoma was named by Duncan (1891).

It was synonymized subjectively with Plagiochasma by Kier (1962).

Synonymy list

Year	Name and author
1857	Trematopygus d'Orbigny p. 374
1891	Dochmostoma Duncan
1915	Trematopygus Clark and Twitchell p. 71
1942	Trematopygus Cooke p. 10
1962	Plagiochasma Kier p. 89\
1966	Plagiochasma Kier p. U505
2002	Plagiochasma Sepkoski

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
—	Ambulacraria
phylum	Echinodermata
subphylum	Eleutherozoa
—	Echinozoa	()
class	Echinoidea	()

Rank	Name	Author
subclass	Euechinoidea	Bronn 1860
superorder	Acroechinoidea	()
—	Carinacea
—	Irregularia	()
—	Microstomata
—	Neognathostomata
family	Nucleolitidae
genus	Plagiochasma

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. †Plagiochasma

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†Plagiochasma cruciferum Morton 1830

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Invalid names: Nucleolites analis Agassiz 1857 [synonym], Pyrina freucheni Desor 1926 [synonym], Trematopygus analis dOrbigny 1855 [synonym]

†Plagiochasma lammersmaxi Jagt and Ham 2000

†Plagiochasma olfersii Agassiz 1836

†Plagiochasma orientalis Fourtau 1921

Invalid names: Dochmostoma Duncan 1891 [synonym], Trematopygus d'Orbigny 1857 [objective synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

high Mg calcitec

Ontogeny:

accretion, addition of partsp

Environment:

marinep

Locomotion:

actively mobilec

Life habit:

epifaunalc

Diet:

grazerc

Diet 2:

deposit feederc

Vision:

limitedc

Dispersal:

waterp

Dispersal 2:

planktonicp

Created:

2004-02-28 12:05:24

Modified:

2010-02-12 04:00:29

Source: c = class, p = phylum

References: Kiessling 2004, Aberhan 1992

Age range: base of the Hauterivian to the top of the Thanetian or 132.90000 to 56.00000 Ma

Collections (41 total)

Time interval	Ma	Country or state	Original ID and collection number
Early/Lower Hauterivian	136.4 - 130.0	France	P. olfersii (68934 68940 68943 68994 68995 68997 69007 69020 69022 69063 69067 69079 69081 69082 69494 69745 69763 69776 69781 69782 69783 69785 69786 69794)
Late/Upper Hauterivian	136.4 - 130.0	Switzerland (Neuchatel)	P. olfersii (31986)
Hauterivian	132.9 - 129.4	Portugal	P. excentricum (65876)
Early/Lower Cenomanian	99.6 - 93.5	Egypt	P. orientalis (220862)
Late/Upper Maastrichtian	70.6 - 66.0	Netherlands (Limburg)	P. lammersmaxi (32167)
Late/Upper Maastrichtian - Danian	70.6 - 61.6	Netherlands	P. lammersmaxi (32160)
Danian	66.0 - 61.6	USA (Georgia)	Rhopostoma cruciferum (155919)
Danian	66.0 - 61.6	USA (Alabama)	Rhopostoma cruciferum (2813 2814 2838 2839 2840 2841 2842 155921)
Danian	66.0 - 61.6	Austria	P. cruciferum (47930)
Danian	66.0 - 61.6	Denmark	Pyrina freucheni (89866)
Thanetian	59.2 - 56.0	USA (New Jersey)	P. crucifer, Trematopygus cruciferus (3113)