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Hemithecella expansa

Polyplacophora - Mattheviidae

Taxonomy
Hemithecella expansa was named by Butts (1941) [Hemithecella expansa Ulrich &Bridge in Butts 1941]. It is not a trace fossil. Its type locality is Just north of De Busk Mill, 3 miles south of Glade Spring, which is in a Demingian carbonate limestone in the Chepultepec Formation of Virginia.

Synonymy list
YearName and author
1941Hemithecella expansa Butts pp. 19 - 20 figs. pl. 68 f. 6
1979Hemithecella expansa Runnegar et al. p. 1389 figs. pl. 1 f. 31-32
1995Hemithecella expansa Stinchcomb and Darrough pp. 58 - 60 figs. 6.7-6.15, 8.13, 8.14
2004Hemithecella expansa Vendrasco and Runnegar figs. 13.1-13.4

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
—Serialia
classPolyplacophorade Blainville 1816
subclassPaleoloricata()
familyMattheviidae
genusHemithecella
speciesexpansa

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.

†Hemithecella expansa Butts 1941
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: aragonitec
Entire body: yesf
Adult length: 10 to < 100f
Adult width: 1.0 to < 10f
Adult height: 1.0 to < 10f
Ribbing: minorf
Spines: nonef
Environment: marine, brackishc
Locomotion: facultatively mobilec
Attached: yesc
Life habit: epifaunalc
Diet: grazerc
Vision: limitedc
Created: 2009-02-26 06:51:14
Modified: 2009-02-26 08:51:14
Source: f = family, c = class
References: Hendy 2009, Kiessling 2003

Age range: base of the Tremadoc to the top of the Demingian or 486.40000 to 483.40000 Ma

Collections (7 total)


Time interval Ma Country or state Original ID and collection number
Demingian486.85 - 483.4USA (Virginia) Hemithecella expansa (type locality: 56651)
Gasconadian486.85 - 477.1USA (Missouri) Hemithecella expansa (64584)
Tremadocian486.85 - 477.1USA (Virginia) Hemithecella expansa (78881)
Tremadoc486.4 - 477.1USA (Missouri) Hemithecella expansa (8939 8940) Hemithecella sp. (8941 8943)