Eoserratosagitta serrata, Doguzhaeva & Mutvei & Mapes, 2002
publication ID |
https://doi.org/ 10.5281/zenodo.13304973 |
persistent identifier |
https://treatment.plazi.org/id/03A58079-7F09-D342-FF92-FD49F251B425 |
treatment provided by |
Felipe |
scientific name |
Eoserratosagitta serrata |
status |
sp. nov. |
Eoserratosagitta serrata sp. nov.
Figs. 1A–C View Fig , 2A–C, 3A–D, 4A, B View Fig .
Holotype: OUZC 4002 /A, ( Fig. 2A, B) . Paratypes ( OUZC 4002 /B, C, D; Fig. 4 View Fig ) .
Type locality: Cove Creek locality (See Mapes 1979, locality M−22) in northern Arkansas ( USA).
Type horizon: Middle Chesterian (Namurian Aequivalent), Upper Mississippian (Lower Serpukhovian). The phosphate concretion that contains the specimens is estimated to have come 1 to 3 m above the base of the formation in a black platy shale exposed in the banks and in the bed of Cove Creek.
Derivation of name: From the Latin serra, meaning saw, based on the saw−like inner edge of the spine bearing numerous denticles.
Diagnosis.—Small horny spines (approximate length 0.4– 0.5 mm and width 0.05–0.06 mm); gently curved; central cavity long; with convex side rounded and concave side acute; five to six longitudinal bands on each lateral side; concave side serrated, with more than 20 straight, conical hollow denticles, inclined towards the pointed tip; distal portion (1/3 to 2/5 of total length) not serrated. The ratio between length of denticle and width of spine 2/5 (proximally) to 1/2 (distally). Denticles closely spaced, being in contact with each other in their proximal parts. Shape of denticles bullet−like: proximal portion, 2/3 of their length, cylindrical, and remaining distal portion conical, strongly pointed; ratio between maximum diameter and length 1/3–1/4.
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