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Zygospira lebanonensis
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
| Year | Name and author |
|---|---|
| 1956 | Zygospira lebanonensis Cooper pp. 671 - 672 figs. Plate 142, C, figures 11-15 |
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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
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell 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. |