PBDB Taxon

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

Heterelasma

Rhynchonellata - Terebratulida - Cryptonellidae

Taxonomy

Heterelasma was named by Girty (1909).

It was reranked as Dielasma (Heterelasma) by Reed (1944).

It was assigned to Dielasma by Reed (1944); and to Cryptonellinae by Williams et al. (2006).

Species

Dielasma (Heterelasma) semitarium, H. angulatum, H. biplexiforme, H. concavum, H. contortum, H. contrerasi, H. geniculatum, H. gibbosum, H. glansfagea, H. leganyii, H. lenticularia, H. magnum, H. ngariensis, H. pentagonum, H. quadratum, H. shumardianum, H. solidum, H. sulciplicatum, H. venustulum

Synonymy list

Year	Name and author
1909	Heterelasma Girty p. 337
1944	Dielasma (Heterelasma) Reed p. 160
2006	Heterelasma Williams et al. p. 2025

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
—	Lophophorata
—	Panbrachiopoda	Carlson and Cohen 2020
phylum	Brachiopoda	Cuvier 1805

Rank	Name	Author
subphylum	Rhynchonelliformea	Williams et al. 1996
class	Rhynchonellata	Williams et al. 1996
order	Terebratulida
suborder	Terebratulidina
superfamily	Cryptonelloidea	Thomson 1926
family	Cryptonellidae	Thomson 1926
subfamily	Cryptonellinae	Thomson 1926
genus	Heterelasma

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. †Heterelasma Girty 1909

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†Dielasma (Heterelasma) semitarium Reed 1944

†Heterelasma angulatum Cooper and Grant 1976

†Heterelasma biplexiforme Schréter 1963

†Heterelasma concavum Cooper and Grant 1976

†Heterelasma contortum Cooper and Grant 1976

†Heterelasma contrerasi Cooper 1953

†Heterelasma geniculatum Stehli 1954

†Heterelasma gibbosum Cooper and Grant 1976

†Heterelasma glansfagea Cooper and Grant 1976

†Heterelasma leganyii Schréter 1963

†Heterelasma lenticularia Stehli 1954

†Heterelasma magnum Cooper and Grant 1976

†Heterelasma ngariensis Hu 1990

†Heterelasma pentagonum Cooper and Grant 1976

†Heterelasma quadratum Cooper and Grant 1976

†Heterelasma shumardianum Girty 1909

†Heterelasma solidum Cooper and Grant 1976

†Heterelasma sulciplicatum Cooper and Grant 1976

†Heterelasma venustulum Girty 1909

Diagnosis

No diagnoses are available

Measurements

part	N	mean	minimum	maximum	median	s.d.
shell height	93	4.79	1.40	14.0	4.50	2.38

Composition:

low Mg calcitep

Environment:

marineuc

Locomotion:

stationaryo

Attached:

yesp

Life habit:

low-level epifaunalo

Diet:

suspension feedero

Vision:

blindc

Created:

2004-02-28 14:14:12

Modified:

2018-11-10 17:47:38

Source: o = order, c = class, p = phylum, uc = unranked clade

References: Nesnidal et al. 2013, Aberhan et al. 2004

Age range: base of the Artinskian to the top of the Spathian or 290.10000 to 247.20000 Ma

Collections (118 total)

Time interval	Ma	Country or state	Original ID and collection number
Artinskian	290.1 - 279.3	USA (Texas)	H. gibbosum (43596) H. sp. (44566 75931) H. sp. 2 (75885)
Artinskian	290.1 - 279.3	China (Xizang)	H. sp. A, H. sp. B, H. ngariensis (97292)
Kungurian	279.3 - 272.3	USA (Texas)	H. angulatum (105849 105981) H. angulatum, H. gibbosum (105687) H. contortum, H. gibbosum (43491) H. geniculata, H. lenticularia (81848) H. geniculatum, H. quadratum (75865) H. gibbosum (43492 43494 43510 43516 43582 81638 101785 101811 106037 106121) H. glansfagea (43495 105931) H. quadratum (75864 75881) H. sp. (81943 81949 102623 105935 106165) H. sp. 3 (75961) H. sp. 4 (43497) H. sp., H. gibbosum (43515) H. sp., H. sulciplicatum (105988) H. sulciplicatum (81635)
Kungurian	279.3 - 272.3	USA (New Mexico)	H. sp. (94875)
Roadian	272.3 - 268.8	USA (Texas)	H. concavum (81645 81650 81693 102602 102605 102614 105592 105726 105887) H. concavum, H. pentagonum, H. solidum (43553) H. concavum, H. solidum (43551) H. glansfagea (43518 43554 43563 43613 44242 81671 101781 101782 101805 105805 105873 105927) H. magnum (105875) H. solidum (105743) H. sp. (102607 102621 106021 106109) H. sp., H. concavum (101767) H. sp., H. concavum, H. pentagonum, H. solidum (43548) H. sp., H. glansfagea (101783 102610)
Roadian - Capitanian	272.3 - 259.51	USA (Texas)	H. venustulum (108835)
Wordian	266.9 - 264.28	Pakistan	Dielasma semitarium (125835)
Wordian	266.9 - 264.28	USA (Texas)	H. concavum (81709) H. concavum, H. pentagonum (105764) H. shumardianum (81586 81622 105899 106108 106138 106244 106245 106299) H. sp. (102619) H. sp., H. concavum, H. pentagonum, H. solidum (43550) H. sp., H. shumardianum (101867) H. sp., H. venustulum (105896) H. venustulum (81939)
Wordian	266.9 - 264.28	Mexico (Sonora)	H. contrerasi (40810 40813 40815 40816 40821 40846)
Capitanian	264.28 - 259.51	USA (Texas)	H. shumardianum (105895 105904 105993 105994 106242 106243 106248 106249 106250 106251 108831) H. shumardianum, H. venustulum (101798 101809 102618 102624 108812) H. venustulum (105893 105894)
Capitanian	264.28 - 259.51	USA (New Mexico)	H. shumardianum (81968 102622 102625)
Capitanian	264.28 - 259.51	Mexico (Coahuila)	H. shumardianum (62912)
Wuchiapingian	259.9 - 254.17	Hungary	H. sp., H. biplexiforme, H. leganyii (131451)
Wuchiapingian	259.9 - 254.17	USA (Nevada)	H. n. sp. A (39519)
Changhsingian	254.17 - 252.17	Nepal	H. sp. (43194)
Spathian	251.3 - 247.2	Russian Federation	H. sp. (191396)