| Home> Miocene>

List species

Didymocyrtis laticonus (Riedel, 1959)

Description - Add description

Cortical twin-shell rather thick-walled, with pores subcircular or circular, ten to thirteen on the half-equator. On the broader parts of the shell, on either side of the equatorial constriction, are pronounced obtuse moundlike protuberances, at which the shell wall is thickened; there is a tendency in some specimens for these protuberances to be so arranged that two gridles of them encircle each half of the twin-shell. At each pole of the shell arises a broadly subconical, densely spongy column, which is almost as broad at its base as the polar surface of the twin-shell. Medullary shells two (or perhaps only one in some specimens), of which the inner is spherical or lenticularly compressed. This species is distinguished from all others of the genus by the broadly subconical polar columns.
Dimensions: (based on 20 specimens) Length of polar columns 45-70µ, median breadth 28-40µ. Length of cortical shell 93-125µ; maximum breadth 68-113µ. Breadth of outer medullary shell 30-35µ.
(Riedel) 1959











Discussion / Comments


Web links