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Syspacephalus crassus

Artiopoda - Ptychopariida - Ptychopariidae

Taxonomy
Syspacephalus crassus was named by Rasetti (1951).

Sister species lacking formal opinion data
S. kamyschovae, S. laevigatus, S. perola, S. uncus

Synonymy list
YearName and author
1951Syspacephalus crassus Rasetti pp. 246 - 247 figs. pl. 9, figs. 12-16
2003Syspacephalus crassus Sundberg and McCollum p. 355

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—EcdysozoaAguinaldo et al. 1997
—Panarthropoda
phylumArthropodaGravenhorst 1843
RankNameAuthor
classArtiopodaHou and Bergstrom
classTrilobitaWalch 1771
subclassLibristoma
orderPtychopariidaSwinnerton 1915
familyPtychopariidaeMatthew 1887
genusSyspacephalusPoulson 1927
speciescrassusRasetti 1951

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.

†Syspacephalus crassus Rasetti 1951
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Entire body: yesg
Adult length: 1.0 to < 10g
Adult width: 1.0 to < 10g
Spines: noneg
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingc
Life habit: low-level epifaunalc
Diet: carnivorec
Vision: well-developedf
Created: 2009-06-09 21:28:10
Modified: 2009-06-09 23:28:10
Source: g = genus, f = family, c = class
References: Aberhan et al. 2004, Hendy 2009

Age range: base of the St Davids to the top of the Delamaran or 506.50000 to 505.30000 Ma

Collections (10 total)


Time interval Ma Country or state Original ID and collection number
Delamaran509.7 - 505.3USA (Nevada) Syspacephalus crassus (10589)
Middle Cambrian506.5 - 497.0Canada (British Columbia) Syspacephalus crassus (188658)
St Davids506.5 - 497.0USA (Nevada) Syspacephalus crassus (50094 50095 50108 50113 50114 50293 50294 50331)