The turtle family Trionychidae comprises a number of turtle genera commonly known as Softshell Turtles. This freshwater turtle family occurs in Africa, Asia, North America, and the East Indies. The carapace of these turtles lack any scutes, and is leathery and pliable at the sides. Some of the largest freshwater turtles in the world occur within this family. The term carapace refers to a dorsal section of an exoskeleton or shell, in a number of animal groups. ...
Classification: Image File history File linksMetadata Download high resolution version (768x1024, 449 KB) Summary Name Pelodiscus sinensis (Wiegmann, 1835) The juvenile collected in Nagasaki Prefecture, Japn in spring 1996 was raised even into the adult. ... Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms (as opposed to folk taxonomy). ... Phyla Subregnum Parazoa Porifera (sponges) Subregnum Agnotozoa Placozoa (trichoplax) Orthonectida (orthonectids) Rhombozoa (dicyemids) Subregnum Eumetazoa Radiata (unranked) (radial symmetry) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anemones) Bilateria (unranked) (bilateral symmetry) Acoelomorpha (basal) Orthonectida (parasitic to flatworms, echinoderms, etc. ... Typical Classes Subphylum Urochordata - Tunicatas Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... Orders See text. ... Orders Testudines (Turtles) Millerettid - extinct Nyctiphruret - extinct Pareiasaur - extinct Procolophonoid - extinct The anapsids are a group of amniotes, characterized by skulls without openings near the temples. ... Families See text Turtles are reptiles of the order Testudinata, most of whose body is shielded by a special bony shell developed from their ribs. ... Most modern turtles and tortoises belong to this group. ...
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