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Lophophaena simplex Funakawa, 1994

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Lophophaena simplex
Holotype.—OCU CR-0003 (Ny-89)
Description.—The first segment is subspherical to ellipsoidal. One to four (occasionally more) robust horns that are unrelated to the apical rib are on the shell. These horns are shorter than the half-height of the first segment. The apical horn and ventral horn are unbladed and poorly developed. Pores in the first segment are circular to subcircular and randomly arranged. Axial projection is present and in some specimens it is well-developed like a spine. The second segment is bell-shaped with indistinct dorsal and lateral ribs, without feet extended from them. In most specimens, there are many external unrelated to internal spicules on the lower part of the second segment. Pores in the second segment are circular to subcircular and randomly arranged but in the lower part are arranged weakly along longitudinal ribs. The distal end of the second segment is open with teeth, but in some specimens, tends to be closed by a porous piate. Surface of the second segment is without spines.
Dimensions.—Measurements are based on 12 specimens. The maximum diameter of the first segment is 47-69 (54) µm, of the second segment 78-102 (91) µm, total height of the shell (not including apical horn) is 98-133 (111) µm.
Remarks.—This species is distinguished from other species of Lophophaena by its stout horns, and from Ceratocyrtis multicornus sp. nov. by its larger subspherical to ellipsoidal first segment.
Etymology.—The specific name means "simple" in Latin.
Occurrences.— Oik-6, 7, Ny-65, 69, 81, 89 and Is-1. Few to very rare in abundance.
Stratigraphic range.—The upper limit is in the Denticulopsis katayamae Zone. The lower limit is not confirmed.

Funakawa 1994











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