Atractyliopsis cumberlandensis

Name

Atractyliopsis cumberlandensis

Rank

Species

Generic Name

[Genus] Atractyliopsis

Authors (Pub.)

Rich M.  

Publication

Upper Mississippian (Carboniferous) Calcareous Algae from Northeastern Alabama, South-Central Tennessee, and Northwestern Georgia [1974/4]

Journal

Journal of Paleontology

Volume

48

Issue

2

Page number

367

Year

1974

Parent Taxon

[Genus] Atractyliopsis

Fossil Status

thallus (calcareous)

Stratigraphy

Visean

Strat. comment

Monteagle Limestone

Location

Locality HV-6b5-1, NW1/4 sec. 15, SW1/4 sec. 10, N1/2 sec. 9, and boundary between secs. 4 and 5, T4S, R1E, along U. S. Highway 431 and road leading to top of Monte Sano Mountain, Huntsville Quadrangle (71/2'), Madison County, Alabama, USA

Paleoregion

Laurussia (Laurentia)

Data for Holotypus

Repository

National Museum of Natural History, Smithsonian Institution, Washington, USA

Repository Number

USNM 203547

Diagnosis

Thallus cylindrical, probably terminating in a rounded tip, and consisting of a long unsegmented central tube generally filled with a mosiac of spar resulting from infilling and or recrystallization. The clear calcite wall contains numerous spherical to subspherical pores or globules now filled with relatively dark finely crystalline calcite. The pores or globules opened outward, inward, or in both directions. Spacing of the pores is uniform in sagittal, longitudinal, and tangential sections. Longitudinal sections appear as parallel-sided rods with marginal rows of dark pores or globules. Width of the thallus is 0.425 to 0.725 mm; length of the thallus in one incomplete specimen (P1. 2, fig. 5) is 3.755 mm. Spacing between centers of adjacent pores is 0.090 to 0.150 mm; diameters of pores range from 0.062 to 0.100 mm. The number of pores in one subcircular cross-section is 22, and the number in one partial circular cross-section is estimated to be 20. Wall thickness is 0.080 to 0.150 mm.