PBDB Taxon

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

Hedstroemina fragilis

Strophomenata - Strophomenida - Rafinesquinidae

Taxonomy

Hedstroemina fragilis was named by Bancroft (1929) [= ?1883 Strophomena Callawayiana Davidson, p. 193, pl. 16, figs 6–7. Lectotype selected by Cocks (1978, p. 112)]. Its type specimen is BB 14380, a shell (ventral internal mould), and it is a 3D body fossil. It is the type species of Hedstroemina.

Sister species lacking formal opinion data

H. zakeenensis

Synonyms

Hedstroemina parva was named by Bancroft (1929) [lectotype selected by Cocks (1978, p. 112).]. Its type specimen is BB 14385, a valve (ventral internal mould), and it is a 3D body fossil.

It was synonymized subjectively with Hedstroemina fragilis by Cocks (2010).
Strophomena callawayiana was named by Davidson (1883) [Strophomena Callawayiana].

It was recombined as Dactylogonia callawayiana by Cocks (1978); it was replaced with Hedstroemina fragilis by Cocks (2010).
Hedstroemina robusta was named by Bancroft (1929).

It was synonymized subjectively with Hedstroemina fragilis by Cocks (2010).

Synonymy list

Year	Name and author
1883	Strophomena callawayiana Davidson p. 193 figs. pl. 16, figs 6–7
1929	Hedstroemina fragilis Bancroft p. 34 figs. Pl. 2, figs. 1-3
1929	Hedstroemina parva Bancroft p. 57 figs. pl. 2, figs 4–5
1929	Hedstroemina fragilis Bancroft p. 58 figs. Pl. 2, figs. 1-3
1929	Hedstroemina robusta Bancroft p. 59 figs. pl. 2, figs 6–7
1978	Dactylogonia callawayiana Cocks p. 119
2010	Hedstroemina fragilis Cocks p. 1166 figs. Plate 2, figures 9–14

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

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	Strophomenata	Williams et al 1996
order	Strophomenida	Opik 1934
superfamily	Strophomenoidea	King 1846
family	Rafinesquinidae	Schuchert 1893
subfamily	Rafinesquininae	Schuchert 1893
genus	Hedstroemina	Bancroft 1929
species	fragilis	Bancroft 1929

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.

†Hedstroemina fragilis Bancroft 1929

show all | hide all

Invalid names: Hedstroemina callawayiana Davidson 1883 [replaced], Hedstroemina parva Bancroft 1929 [synonym], Hedstroemina robusta Bancroft 1929 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

low Mg calcitep

Entire body:

yesg

Adult length:

10 to < 100g

Adult width:

10 to < 100g

Folds:

noneg

Ribbing:

minorg

Spines:

noneg

Internal reinforcement:

noneg

Environment:

marineuc

Locomotion:

stationaryf

Attached:

yesp

Life habit:

epifaunalf

Diet:

suspension feederf

Vision:

blindc

Created:

2009-06-10 12:18:24

Modified:

2009-06-10 14:18:24

Source: g = genus, f = family, c = class, p = phylum, uc = unranked clade

References: Hendy 2009, Hendy et al. 2009, Aberhan et al. 2004, Nesnidal et al. 2013

Age range: base of the Caradoc to the top of the Streffordian or 458.40000 to 449.50000 Ma

Collections (6 total)

Time interval	Ma	Country or state	Original ID and collection number
Caradoc	458.4 - 449.5	United Kingdom (Wales)	Hedstroemina fragilis (173777 173778)
Cheneyan - Marshbrookian	452.5 - 454.0	United Kingdom (Shropshire)	Hedstroemina fragilis (173796)
Cheneyan - Marshbrookian	452.5 - 454.0	United Kingdom (Wales)	Hedstroemina fragilis (173793)
Streffordian	451.3 - 449.5	United Kingdom (Shropshire)	Hedstroemina fragilis (173744)
Streffordian	451.3 - 449.5	United Kingdom (Wales)	Hedstroemina fragilis (173799)