| Home> Cenozoic> Miocene>

List species

Pseudodictyophimus tanythorax Funakawa, 1994

Description - Add description

Surface of the shell is smooth without spines. The first segment is hemispherical. The apical horn is unbladed or three-bladed. The ventral horn is shorter than the apical horn. Pores in the first segment are circular to subcircular and randomly arranged. Axial projection is distinct. Development of the second segment is variable but in most specimens it is well-developed. Pores in the second segment are circular to subcircular and randomly arranged, vary in size, being generally larger than those of the first segment. The distal end of the second segment is fully open and surrounded by teeth. Three-bladed feet extend outside at the lower part of the second segment.
Dimensions: Measurements are based on 24 specimens. The maximum diameter of the first segment is 28-40 (33) Ám, the second segment is 63-85 (70) Ám, total height of the shell (not include apical horn and distal teeth) is 58-100 (79)Ám.
Remarks: This species has a highly variable skeleton due to the development of the second sement and feet. This species is distinguished from P.gracilipes by its long and stout apical horn and straightly prolonged feet. It is distinguised from Lophophaena triangula sp. nov. by its long and stout apical horn and a smaller first segment than in the latter species.
Etymology: The specific name means "long thorax" in Greek.
Occurences: All samples. Common to very rare in abundance.
Stratigraphic range: All zones. The upper and lower limits are not confirmed.
Funakawa 1994











Discussion / Comments


Web links