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Sphaerexochus dimorphus

Trilobita - Phacopida - Cheiruridae

Sphaerexochus dimorphus was named by Whittington and Evitt (1953). It is not extant. Its type specimen is USNM 116508.

Synonymy list
YearName and author
1953Sphaerexochus dimorphus Whittington and Evitt pp. 87-92 figs. pl. 17 f. 28-51; pl. 20; pl. 21 f. 1-4;

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
classTrilobitaWalch 1771
orderPhacopidaSalter 1864
suborderCheirurinaHarrington and Leanza 1957
familyCheiruridaeHawle and Corda 1847
subfamilySphaerexochinaeOpik 1937
genusSphaerexochusBeyrich 1845

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.

No diagnoses are available
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: Harrington et al. 1959, Aberhan et al. 2004, Hendy 2009

Age range: base of the Llandovery to the top of the Gorstian or 443.40000 to 425.60000 Ma

Collections (14 total)

Time interval Ma Country or state Original ID and collection number
Llandovery443.4 - 433.4Canada (Northwest Territories) Sphaerexochus dimorphus (26046)
Llandovery - Wenlock443.4 - 427.4Canada (Northwest Territories) Sphaerexochus dimorphus (26034 26041 26047)
Sheinwoodian433.4 - 430.5Canada (Nunavut) Sphaerexochus dimorphus (26003)
Sheinwoodian433.4 - 430.5Canada (Northwest Territories) Sphaerexochus dimorphus (26004 26005 26006)
Wenlock433.4 - 427.4Greenland Sphaerexochus dimorphus (188490)
Gorstian427.4 - 425.6Canada (Nunavut) Sphaerexochus dimorphus (26008)
Whitwellian426.2 - 425.4Canada (Northwest Territories) Sphaerexochus dimorphus (26035 26042 26048 26050)