Ampullina Melongena Fossil Sea Shell Prehistoric Gastropods Oligocene Collection

Fossil Seashells Pugilina Ampullinopsis mm 64 x 37 x 37 gr 81 Sea Snails Gastropods Extinct Prehistoric Molluscs Oligocene Cenozoic Tertiary Collecting Paleontology Museum.
From left to right: Pugilina pyrulina (Melongenidae) 3.6 cm and Ampullinopsis (Globularia) crassatina (Ampullinidae) 3.7 cm, on matrix.

Pleasant fossil find on a matrix with incorporated two Gasteropoda Shells from the lower Oligocene, a representative collectible sample of excellent quality, with clear details of the dorsal shapes, the coils and the crown of well-preserved ornamental ribs and spines.
Only a piece, as in photo.

Ampullinopsis is an extinct taxonomic genus of deep-water sea snails, marine gastropod molluscs in the clade Sorbeoconcha. These sea snails were epifaunal grazers. Sea snails of this genus lived from Paleocene epoch to Miocene epoch (age range: 48.6 to 20.43 million years ago).
Known species assigned a this genus are:
Ampullinopsis birmanica Vredenburg 1922
Ampullinopsis crassatina Lamarck 1804
Ampullinopsis spenceri Cooke 1919
Ampullinopsis (Globularia) altivapicana Eames 1952
all belonging to superfamily Campaniloidea, family Ampullinidae.
Synonyms of Ampullinopsis genus are: Ampullina  and Globularia (alternative spelling).

Melongenidae is a family of marine gastropod molluscs whose shells are usually decorated with a crown of ribs and little pronounced spines.
A known extinct species is Melongena woodwardi (Roxo, 1924) from the Miocene, from the Pebas Formation, in the Amazon.
The shells of this family, which still includes many living species, have an extremely variable shape and sculpture. There is therefore still a disagreement as to how many modern species of Melongena actually exist. The Melongena genus occurs in our era only in the tropical Americas.
The species within this genus live in the tropical intertidal zone, in muddy areas such as under mangrove trees.
Melongena snails are carnivorous, feeding mainly on small bivalves (clams, mussels and oysters). They also feed on other species of gastropods and are known to be cannibals.