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Rare in the fossil record are the homobasidiomycetes (a taxon roughly equivalent to the mushroom-producing species of the agaricomycetes). Two amber-preserved specimens provide evidence that the earliest known mushroom-forming fungi (the extinct species Archaeomarasmius legletti) appeared during the mid-Cretaceous, 90 Ma. [31] [32]
The phylogeny (evolutionary "family tree") of molluscs is a controversial subject. In addition to the debates about whether Kimberella and any of the " halwaxiids " were molluscs or closely related to molluscs, [ 5 ] [ 6 ] [ 8 ] [ 9 ] debates arise about the relationships between the classes of living molluscs. [ 7 ]
Mushroom-producing fungi used as a food source by snails and slugs include species from several genera. Some examples are milk-caps (Lactarius spp.), the oyster mushroom (Pleurotus ostreatus), and the penny bun. Additionally, slugs feed on fungi from other genera, such as Agaricus, Pleurocybella, and Russula. [29]
The other three unite related orders which share a common ancestor and form a branch of the nautiloid taxonomic tree: Plectronoceratoidea, which consists mostly of small Cambrian forms that include the ancestors of subsequent stocks; Orthoceratoidea, which unites different primarily orthoconic orders (including the ancestors for Bacritida and ...
Assimineidae is a family of small snails, also known as palmleaf snails, with an operculum, gastropod mollusks or micromollusks in the superfamily Rissoidae. Many of these very small snails live in intermediate habitats, being amphibious between saltwater and land; others live in freshwater.
Viviparidae, sometimes known as the river snails or mystery snails, are a family of large aquatic gastropod mollusks, being some of the most widely distributed operculate freshwater snails. This family is classified in the informal group Architaenioglossa according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 .
Ellobiidae, common name the hollow-shelled snails, is a family of small air-breathing land, marine, and brackish snails; pulmonate gastropod mollusks in the clade Eupulmonata. [2] Ellobiidae is the only family in the superfamily Ellobioidea , according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 ).
Snails in the family Fasciolariidae are carnivorous. They feed on other gastropods and on bivalves. Some also prey on worms and barnacles. The snails are gonochoristic, i.e. the individuals have just one sex. The female snails deposit their eggs in horny capsules either in a single form or in clusters arranged around a hollow axis.