fish
Jawless fish are Phylum Chordata, they are also known as paraphyletic, they still are around today.
e. paraphyletic
No, fish are not monophyletic. The term "fish" is a paraphyletic group because it includes some but not all descendants of a common ancestor. It does not include tetrapods (four-limbed vertebrates such as amphibians, reptiles, birds, and mammals) which share a more recent common ancestor with some fish species.
Yes, reptiles are considered paraphyletic in the classification of vertebrates because they do not include all descendants of their common ancestor.
Fish are in the phyla of Chordata because most fish have backbones.
Lacertilia is a paraphyletic grouping of squamates commonly referred to as "lizards". The group is paraphyletic because it comprises all members of the clades Iguania and Scleroglossa, but excludes Serpentes.
Paraphyletic
Protists are a paraphyletic group because animals, fungi, and plants are the crown groups evolved from different lineages of the protists. They aren't included in the same group as protists taxonomically. This explains why the cladists consider the protist a paraphyletic group.
A group that is not a clade is known as a paraphyletic group. This type of group includes an ancestor and some, but not all, of its descendants, failing to encompass the entire lineage. An example of a paraphyletic group is "reptiles," which excludes birds, despite birds being descendants of certain reptilian ancestors. Thus, paraphyletic groups do not accurately reflect the evolutionary relationships among organisms.
A group of species that consists of a common ancestor and some but not all of its descendants.
Green algae is paraphyletic and contains many species of chlorophyta.