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1 giorno fa · A study in 2001 based on comparisons of ribosome DNA concluded that the most fundamental division within sponges was between glass sponges and the rest, and that Eumetazoa are more closely related to calcareous sponges (those with calcium carbonate spicules) than to other types of sponge.
9 apr 2024 · sponge, any of the primitive multicellular aquatic animals that constitute the phylum Porifera. They number approximately 5,000 described species and inhabit all seas, where they occur attached to surfaces from the intertidal zone to depths of 8,500 metres (29,000 feet) or more. The members of one family, the Spongillidae, are found in fresh ...
2 giorni fa · Eumetazoa: Clade: ParaHoxozoa: Phylum: Cnidaria Hatschek, 1888: Subphyla and classes; Subphylum Anthozoa—corals and sea anemone. Class Octocorallia; Class Hexacorallia; Class Ceriantharia; Subphylum Medusozoa—jellyfish and hydrozoans: Class Cubozoa—box jellyfish, sea wasps; Class Hydrozoa—hydroids, hydra-like animals; Class Polypodiozoa ...
12 apr 2024 · Carcharhiniformes. Squalo martello smerlato ( Sphyrna lewini ). Squalo limone ( Negaprion brevirostris) circondato dalle remore. Selachimorpha è un superordine di pesci cartilaginei predatori, dalle forti mascelle e di dimensioni medio-grandi, i cui membri sono comunemente noti con il nome di squalo o pescecane .
26 mar 2024 · "Eumetazoa" published on by Oxford University Press. A clade, sometimes given the rank of subkingdom, containing all animals that possess tissues, such as muscle or nerve tissue. Hence it excludes multicellular animals that lack tissues, notably the sponges (Porifera). ...
1 giorno fa · Mollusca is the second-largest phylum of invertebrate animals, after Arthropoda; members are known as molluscs or mollusks [a] ( / ˈmɒləsks / ). Around 76,000 extant species of molluscs are recognized. [3] The number of fossil species is estimated between 60,000 and 100,000 additional species. [4] The proportion of undescribed species is ...
4 giorni fa · DESCRIPTION: Polar bears are the largest land carnivore. Adapted for the cold, polar bears have a thick fur coat that appears white in coloration, but is really translucent. Their black skin color is readily apparent on the nose, eyes, lips and footpads. In addition to their size and color, polar bears may also be distinguished from other bear ...
