PBDB Taxon

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

Sphaerexochus calvus

Trilobita - Phacopida - Cheiruridae

Taxonomy

Sphaerexochus calvus was named by Mc Coy (1846).

Sister species lacking formal opinion data

S. arcuatus, S. dimorphis, S. filius, S. lanei, S. lorum

Synonyms

Sphaerexochus mirus was named by Beyrich (1845). It is the type species of Sphaerexochus.

It was synonymized subjectively with Sphaerexochus calvus by Warburg (1925).
Sphaerexochus angustifrons was named by Angelin (1854).

It was synonymized subjectively with Sphaerexochus calvus by Warburg (1925).
Sphaerexochus latirugatus was named by Reed (1896).

It was synonymized subjectively with Sphaerexochus calvus by Warburg (1925).

Synonymy list

Year	Name and author
1845	Sphaerexochus mirus Beyrich
1846	Sphaerexochus calvus Mc Coy
1854	Sphaerexochus angustifrons Angelin
1896	Sphaerexochus latirugatus Reed

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Ecdysozoa	Aguinaldo et al. 1997
—	Panarthropoda
phylum	Arthropoda	Latreille 1829
subphylum	Artiopoda	(Hou and Bergstrom)

Rank	Name	Author
class	Trilobita	Walch 1771
order	Phacopida	Salter 1864
suborder	Cheirurina	Harrington and Leanza 1957
family	Cheiruridae	Hawle and Corda 1847
subfamily	Sphaerexochinae	Opik 1937
genus	Sphaerexochus	Beyrich 1845
species	calvus	Mc Coy 1846

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.

†Sphaerexochus calvus Mc Coy 1846

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Invalid names: Sphaerexochus angustifrons Angelin 1854 [synonym], Sphaerexochus latirugatus Reed 1896 [synonym], Sphaerexochus mirus Beyrich 1845 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

low Mg calcitec

Composition 2:

chitinc

Entire body:

yesg

Adult length:

10 to < 100g

Adult width:

10 to < 100g

Spines:

minorg

Ontogeny:

molting, addition of partsc

Environment:

marinec

Locomotion:

fast-movingc

Life habit:

low-level epifaunalc

Diet:

carnivoref

Vision:

well-developedg

Created:

2009-06-09 12:26:29

Modified:

2010-01-10 03:55:17

Source: g = genus, f = family, c = class

References: Aberhan et al. 2004, Hendy 2009, Harrington et al. 1959

Age range: base of the Rawtheyan to the top of the Ludfordian or 448.80000 to 422.70000 Ma

Collections (20 total)

Time interval	Ma	Country or state	Original ID and collection number
Katian	452.8 - 445.2	Sweden (Dalarna)	Sphaerexochus calvus (124939)
Katian - Hirnantian	452.8 - 443.1	Sweden (Dalarne)	Sphaerexochus calvus (73413)
Pirgu	449.5 - 445.2	Sweden	Sphaerexochus calvus (161788)
Pirgu - Hirnantian	449.5 - 443.1	Sweden (Dalarne)	Sphaerexochus calvus (73408 73414)
Pirgu - Porkuni	449.5 - 443.1	Sweden (Dalarne)	Sphaerexochus calvus (73462)
Cautleyan - Hirnantian	449.2 - 443.1	Ireland	Sphaerexochus calvus (161780)
Rawtheyan	448.8 - 445.2	United Kingdom (England)	Sphaerexochus calvus (161737)
Llandovery	443.1 - 432.9	Ukraine	Sphaerexochus mirus (23343)
Sheinwoodian	432.9 - 430.6	Czech Republic	Sphaerexochus mirus (14096)
Wenlock	432.9 - 426.7	Ukraine	Sphaerexochus mirus (23350 23364)
Wenlock	432.9 - 426.7	Czech Republic	Sphaerexochus mirus (14091)
Homerian	430.6 - 426.7	Canada (Northwest Territories)	Sphaerexochus mirus (497)
Homerian	430.6 - 426.7	Czech Republic	Sphaerexochus mirus (14065 14095 14097 14098)
Ludfordian	425.0 - 422.7	Uzbekistan	Sphaerexochus mirus (216475 216476)