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Zygospira lebanonensis

Rhynchonellata - Atrypida - Anazygidae

Taxonomy
Zygospira lebanonensis was named by Cooper (1956) [= Zygospira saffordi Winchell and Schuchert, HALL and CLARKE, Pal. New York, vol. 8, pt. 2, pl. 83, figs. 36-38, 1893.]. Its type specimen is USNM 111377a, a valve (brachial valve), and it is a 3D body fossil. Its type locality is Shelbyville, which is in a Blackriveran shallow subtidal carbonate/mudstone in the Lebanon Limestone Formation of Tennessee.

Sister species lacking formal opinion data

Synonymy list
YearName and author
1956Zygospira lebanonensis Cooper pp. 671 - 672 figs. Plate 142, C, figures 11-15

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
Lophophorata
PanbrachiopodaCarlson and Cohen 2020
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderAtrypidaRzhonsnitskaya 1960
suborderAnazygidinaCopper 1996
superfamilyAnazygoideaDavidson 1883
familyAnazygidaeDavidson 1883
subfamilyAnazyginaeDavidson 1883
genusZygospira
specieslebanonensis

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.

Zygospira lebanonensis Cooper 1956
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Diagnosis
ReferenceDiagnosis
G. A. Cooper 1956Shell of about usual size for the genus, subcircular to subpentagonal in outline; length and width about equal; posterior margins straight forming an obtuse angle of II0° with the beak; sides rounded; front margin somewhat truncated to gently rounded. Surface costate, costae numbering I8 to 23 with 5 occupying the sulcus and 4 on the fold.

Pedicle valve moderately and evenly curved in lateral profile with the greatest curvature at about the middle; umbo somewhat carinated; fold strong, extending from the umbo to the front margin, formed of 4 costae about the same level and 2 additional ones on the slope of the fold; flanks moderately concave and with steep slopes to the margins. Beak suberect.

Brachial valve slightly less deep than the pedicle valve, moderately and evenly convex in lateral profile with the greatest convexity at about the center; sulcus originating just anterior to the umbo which is slightly convex, deepening and widening anteriorly where it occupies a little more than half the valve width. The 3 inner costae of the sulcus are depressed below the outer 2, which in turn are slightly depressed below the costae forming the margin of the sulcus. Flanks slightly convex and with moderate slopes to the margins.
Measurements
No measurements are available
Composition: low Mg calcitep
Entire body: yesg
Adult length: 10 to < 100g
Adult width: 1.0 to < 10g
Adult height: 1.0 to < 10g
Folds: minorg
Ribbing: majorg
Spines: noneg
Internal reinforcement: noneg
Environment: marineuc
Locomotion: stationaryg
Attached: yesg
Epibiont: yesg
Life habit: epifaunalg
Diet: suspension feederg
Vision: blindc
Created: 2009-06-02 14:08:57
Modified: 2009-07-20 15:29:41
Source: g = genus, c = class, p = phylum, uc = unranked clade
References: Aberhan et al. 2004, Nesnidal et al. 2013, Hendy 2009

Age range: base of the Mohawkian to the top of the Richmondian or 457.50000 to 443.70000 Ma

Collections (74 total)


Time interval Ma Country or state Original ID and collection number
Blackriveran460.9 - 449.5USA (Tennessee) Zygospira lebanonensis (type locality: 165268)
Blackriveran - Rocklandian460.9 - 449.5USA (Illinois, Iowa) Zygospira lebanonensis (23795)
Caradoc460.9 - 449.5USA (Virginia) Zygospira lebanonensis (85661 85662 85663 85666 85675 85676 85677 85678 85679 85680 85681 85682 85683 85684 85685 85686 85687 85688 85689 85690 85694 85700 85708 85709 85710 85711 85712 85713 85714 85715 85716 85717 85718 85719 85720 85721 85722 85723 85724 85726)
Rocklandian - Kirkfieldian460.9 - 449.5USA (Illinois, Iowa) Zygospira lebanonensis (23796)
Rocklandian - Shermanian460.9 - 449.5USA (Minnesota) Zygospira lebanonensis (23277 23290)
Mohawkian457.5 - 452.5USA (Kentucky) Zygospira lebanonensis (85817)
Mohawkian457.5 - 452.5USA (Virginia) Zygospira lebanonensis (85578 85579 85589 85591 85595 85596 85599 85600 85603 85605 85606 85607 85608 85609 85610 85611 85612 85613 85614 85615 85617 85618 85619 85620 85621 85622 85624)
Richmondian449.5 - 443.7USA (Idaho) Zygospira lebanonensis (183358)