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Amecephalus normale

Artiopoda - Ptychopariida - Alokistocaridae

Taxonomy
Alokistocare normale was named by Resser (1938). Its type specimen is USNM 95028 and is a 3D body fossil. Its type locality is Locality 37n (Pend Oreille Lake), which is in a Cambrian carbonate limestone/shale in the Lakeview Formation of Idaho.

It was recombined as Amecephalus normale by Sundberg (2020), Tortello (2022).

Sister species lacking formal opinion data
A. laticudum

Synonymy list
YearName and author
1938Alokistocare normale Resser p. 7 figs. Pl. 1, fig. 14
2020Amecephalus normale Sundberg pp. 28 - 32 figs. 24-25
2022Amecephalus normale Tortello p. 627 fig. 9.17–9.19

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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
familyAlokistocaridaeResser 1939
genusAmecephalusWalcott 1924
speciesnormale()

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.

†Amecephalus normale Resser 1938
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Diagnosis
ReferenceDiagnosis
F. A. Sundberg 2020Cranidium subtrapezoidal, moderate length frontal area (36 ± 3% cranidial length), nearly parallel anterior facial sutures, anterior border moderately wide (width 61 ± 7% cranidial width) and narrow (length 16 ± 2% cranidial length), false anterior furrow absent; genal caeca well developed on preglabellar field; palpebral lobes dorsally arched; fixigena slightly convex, gently sloping upwards; bacculae absent. Librigenae with genal caeca; genal spine relatively short (length ∼60% librigenal length), broad based with shallow lateral border furrow extending into spine. Pygidia nearly effaced, faint border furrow and anterior pleural furrow, anterior lateral corners located at the level of the posterior axial lobe, anterior margin strongly curved posterolaterally approximately 1/3 distance from axial lobe. Cranidium and librigena covered in fine granular ornamentation.
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
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingc
Life habit: low-level epifaunalc
Diet: carnivorec
Vision: well-developedf
Created: 2009-06-02 14:42:12
Modified: 2009-06-02 16:42:12
Source: g = genus, f = family, c = class
References: Hendy 2009, Aberhan et al. 2004

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

Collections (4 total)


Time interval Ma Country or state Original ID and collection number
Delamaran509.7 - 505.3USA (Utah) Alokistocare normale (10533)
Wuliuan506.5 - 504.5Argentina (Mendoza) Amecephalus normale (220535 223357)
Middle Cambrian506.5 - 497.0USA (Idaho) Alokistocare normale (type locality: 127486)