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Ischyrotoma

Trilobita - Proetida - Dimeropygidae

Taxonomy
Ischyrotoma was named by Raymond (1925) [Sepkoski's age data: O Aren-l O Llvi-u Sepkoski's reference number: 388,795]. Its type is Ischyrotoma twenhofeli.

It was assigned to Solenopleuridae by Raymond (1925); to Proetida by Sepkoski (2002); and to Dimeropygidae by Fortey and Droser (1999), Jell and Adrain (2002) and Fortey and Bruton (2013).

Synonymy list
YearName and author
1925Ischyrotoma Raymond p. 54
1999Ischyrotoma Fortey and Droser p. 191
2002Ischyrotoma Jell and Adrain p. 388
2002Ischyrotoma Sepkoski
2013Ischyrotoma Fortey and Bruton

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
RankNameAuthor
phylumArthropodaLatreille 1829
subphylumArtiopoda(Hou and Bergstrom)
classTrilobitaWalch 1771
orderProetidaFortey and Owens 1975
familyDimeropygidaeHupe 1953
genusIschyrotoma

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. †Ischyrotoma Raymond 1925
show all | hide all
Ischyrotoma anataphra Fortey 1979
Ischyrotoma borealis Fortey 1980
Ischyrotoma eos Kobayashi 1955
Ischyrotoma juabensis Adrain et al. 2001
Ischyrotoma parallela Boyce 1989
Ischyrotoma sila Loch 2007
Ischyrotoma twenhofeli Raymond 1925
Ischyrotoma wahwahensis Adrain et al. 2001
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Adult length: 10 to < 100g
Adult width: 10 to < 100g
Adult height: 1.0 to < 10g
Spines: noneg
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingc
Life habit: low-level epifaunalc
Diet: deposit feedero
Vision: well-developedf
Comments: BODY SIZE: Data from Harrington et al. (1959).g
Created: 2009-06-10 08:14:46
Modified: 2009-06-10 10:14:46
Source: g = genus, f = family, o = order, c = class
References: Aberhan et al. 2004, Fortey and Owens 1999, Hendy 2009, Alvarez et al. 2008

Age range: base of the Blackhillsian to the top of the Darriwilian or 478.60000 to 458.40000 Ma

Collections (91 total)


Time interval Ma Country or state Original ID and collection number
Tremadoc485.4 - 477.7Canada (Alberta) I. eos (10994 10995)
Tulean485.4 - 471.8Norway (Spitsbergen) I. parallela (189832 189837)
Tulean - Blackhillsian485.4 - 471.8Canada (Newfoundland and Labrador) I. anataphra (195776) I. parallela (196381) I. sp. (196503)
Tulean - Blackhillsian485.4 - 471.8Canada (Newfoundland) I. anataphra (196385) I. sp., I. anataphra (195770 196380)
Jeffersonian485.4 - 468.1Canada (Newfoundland and Labrador) I. parallela (133147)
Jeffersonian485.4 - 468.1USA (Oklahoma) I. sila (106580 106597 106598 106600 106604 106606 106608 106609 106610 106612 106613 106614 106617 106730 106734 106737 106866 106870 106875 106877 106927 106930)
Jeffersonian485.4 - 468.1Canada (Newfoundland) I. anataphra, I. parallela (195756 195785)
Blackhillsian478.6 - 471.8Norway (Spitsbergen) I. sp. (189838 189839)
Blackhillsian478.6 - 471.8Canada (Newfoundland) I. sp. (195777)
Blackhillsian478.6 - 471.8USA (Nevada) I. sp. (77181 104431 104549 104554 104630)
Cassinian478.6 - 468.1Canada (Newfoundland) I. anataphra (195757 195758 195782 195784)
Cassinian478.6 - 468.1Canada (Quebec) I. sp. (50060 50062)
Cassinian478.6 - 468.1Canada (Newfoundland and Labrador) I. anataphra (69196 103540 106241 133127 133140) I. anataphra, I. parallela (106239) I. parallela (106238)
Cassinian478.6 - 468.1USA (Oklahoma) I. sila (106743 106941) I. sp. (106778 106800) I. sp. 1 (106764 106765) I. sp. 1, I. sila (106952)
Cassinian478.6 - 468.1United Kingdom (Scotland) I. stubblefieldi (75589)
Arenig478.6 - 466.0USA (New York) I. sp. (55243)
Arenig478.6 - 466.0Greenland I. anataphra (221130)
Arenigian - Llanvirnian478.6 - 460.9Canada (Northwest Territories) I. sp. (25285)
Floian477.7 - 470.0Canada (Newfoundland) I. sp., I. anataphra (195748)
Rangerian471.8 - 468.1USA (Nevada) I. sp. (104448 104565) I. stubblefieldi, I. stubblefieldi (104653)
Rangerian471.8 - 468.1USA (California) I. sp. (104638)
Rangerian471.8 - 468.1USA (Utah) I. sp. (37452) I. stubblefieldi (37454 37462 37464 37465)
Rangerian - Whiterockian471.8 - 457.5USA (California) I. sp. (104640)
Whiterockian471.8 - 457.5USA (Nevada) I. stubblefieldi (37481 37482)
Whiterockian471.8 - 457.5Canada (Newfoundland and Labrador) I. twenhofeli (104752)
Whiterockian471.8 - 457.5USA (Utah) I. wahwahensis (106373 106374 106375)
Whiterockian471.8 - 457.5Norway (Spitsbergen) I. twenhofeli, Ischyrophyma borealis (106480)
Dapingian470.0 - 467.3USA (California) I. sp. (104639)
Chazyan468.1 - 460.9Canada (Newfoundland and Labrador) I. sp. (104861)
Darriwilian467.3 - 458.4China (Xinjiang) I. sp. (188380)
Llanvirn466.0 - 460.9Canada (Newfoundland and Labrador) I. sp. (78097) I. twenhofeli (78099)
Chatfieldian - Edenian460.9 - 449.5Canada (Nunavut) I. raymondi (24116)