What is the definition of a horse girl?

Are all horses in the same phylum?

All domestic and feral horse breeds belong to the same phylum as they are all the same species, just different breeds. The phylum for a horse is Chordata. Why are horses in the chordata phylum? The chordata phylum is the highest phylum in the animal kingdom.

Are all horses in the phylum Chordata?

All domestic and feral horse breeds belong to the same phylum as they are all the same species, just different breeds. The phylum for a horse is Chordata. Why are horses in the chordata phylum?

What is the phylum of Chordata?

Phylum : Chordata. The first Chordates can be identified in the fossils of the Cambrian Explosion. The oldest fossil chordate is believed to be Cathaymyrus which was found in southern China and is believed to be related to Pikaia gracilens found in the Burgess shale deposits in Canada (Gee). Modern day chordates include fish, reptiles,…

What do all chordates have in common?

All chordates have a number of structures in common: A notochord ( noto = the back; chord = string) is present in all embryos, and may be present or absent/reduced in adults. This is the structure for which the phylum was named.

What is the taxonomy of the phylum Chordata?

Taxonomy of Chordates: The main taxa within Phylum Chordata include: Labeled Microscopic View of Amphioxus. Subphylum Cephalochordata (cephalo = head), which doesn t have a head. This subphylum includes lancelets (or lancets), so-named for their shape.

Are tunicates chordates or chordates?

Subphylum Urochordata (uro = tail) are called the tunicates. Their larvae show typical chordate characteristics, but the adults have lost many of these organs, and what they do still have have become highly-modified.

Is the neck pouches homologous to the neck slits of invertebrate chordates?

However, it is now accepted that it is the vertebrate pharyngeal pouches and not the neck slits that are homologous to the pharyngeal slits of invertebrate chordates. Pharyngeal arches, pouches, and clefts are, at some stage of life, found in all chordates.

What is the phylum Chordata?

The phylum Chordata is an animal phylum which is familiar, since it includes humans and other vertebrates. Not all of the chordates have vertabrates. All chordates have the following features and in different stages of her life.

Are pharyngeal slits homologous to the slits found in chordates?

Evolution of pharyngeal slits. A phylogeny showing when gill slits may have arisen. It is thought that gill slits were subsequently lost in echinoderms. The presence of pharyngeal slits in hemichordates led to debates of whether this structure was homologous to the slits found in chordates or a result of convergent evolution.

How big do tunicates live?

They are about one inch long, and live in the muddy ocean floor. Subphylum Urochordata ( uro = tail) are called the tunicates. Their larvae show typical chordate characteristics, but the adults have lost many of these organs, and what they do still have have become highly-modified.

How many pairs of antennae does a chordate have?

two pairs of antennae. A notochord, a dorsal hollow nerve cord, pharyngeal pouches, and a postanal tail are features that are found at some point during the lives of animals called chordates.

What is the oldest chordate?

The oldest fossil chordate is believed to be Cathaymyrus which was found in southern China and is believed to be related to Pikaia gracilens found in the Burgess shale deposits in Canada (Gee). Modern day chordates include fish, reptiles, birds and mammals, including humans (and horses!).

Are gill slits homologous to pharyngeal slits in echinoderms?

A phylogeny showing when gill slits may have arisen. It is thought that gill slits were subsequently lost in echinoderms. The presence of pharyngeal slits in hemichordates led to debates of whether this structure was homologous to the slits found in chordates or a result of convergent evolution.

Why do pharyngeal slits have so many segments?

Pharyngeal slit. It is postulated that this is how pharyngeal slits first assisted in filter-feeding, and later with the addition of gills along their walls, aided in respiration of aquatic chordates. These repeated segments are controlled by similar developmental mechanisms. Some hemichordate species can have as many as 200 gill slits.

Why do Some hemichordate fish have multiple gill slits?

It is postulated that this is how pharyngeal slits first assisted in filter-feeding, and later, with the addition of gills along their walls, aided in respiration of aquatic chordates. These repeated segments are controlled by similar developmental mechanisms. Some hemichordate species can have as many as 200 gill slits.

What is another word for chordate?

Related to chordate: Deuterostome. (kôr′dāt′, -dĭt) n. Any of numerous animals of the phylum Chordata, having at some stage of development a dorsal nerve cord, a notochord, and gill slits and including all vertebrates, the hagfishes, and certain marine animals such as the lancelets and the tunicates.

What is the difference between Chordata and animal?

(ˈkɔːˌdeɪt) n (Animals) any animal of the phylum Chordata,including the vertebrates and protochordates, characterized by a notochord, dorsal tubular nerve cord, and pharyngeal gill slits adj (Animals) of, relating to, or belonging to the Chordata

What is the anatomy of an animal with notochord?

animals that at some point during their development have a notochord; a dorsal, hollow nerve cord; pharyngeal slits or clefts; and a muscular, post-anal tail. cloaca A common opening for the digestive, urinary, and reproductive tracts found in many nonmammalian vertebrates but in few mammals. conodont

Were pharyngeal gill slits present in the deuterostome ancestor?

With the placement of hemichordates and echinoderms as a sister group to chordates, a new hypothesis has emerged-suggesting that pharyngeal gill slits were present in the deuterostome ancestor . Intriguingly, extant echinoderms lack pharyngeal structures, but fossil records reveal that ancestral forms of echinoderms had gill-like structures.

What is the function of the gill and pharyngeal slits?

The presence of gill slits (in blue) in an acorn worm (left) and a tunicate (right). Pharyngeal slits are filter-feeding organs found among deuterostomes. Pharyngeal slits are repeated openings that appear along the pharynx caudal to the mouth. With this position, they allow for the movement of water in the mouth and out the pharyngeal slits.

What are pharyngeal slits in Worms?

The presence of gill slits (in blue) in an acorn worm (left) and tunicate (right) Pharyngeal slits are filter-feeding organs found in Invertebrate chordates (lancelets and tunicates) and hemichordates living in aquatic environments. Pharyngeal slits are repeated openings that appear along the pharynx caudal to the mouth.

Are pharyngeal slits in hemichordates homologous to those in chordates?

The presence of pharyngeal slits in hemichordates led to debates of whether this structure was homologous to the slits found in chordates or a result of convergent evolution.

What is the function of the gill slits in Worms?

The presence of gill slits (in blue) in an acorn worm (left) and a tunicate (right). Pharyngeal slits are filter-feeding organs found among deuterostomes. Pharyngeal slits are repeated openings that appear along the pharynx caudal to the mouth.

What is the difference between Chordata and Cephalochordata?

Chordata, phylum Chordata – comprises true vertebrates and animals having a notochord. cephalochordate – fish-like animals having a notochord rather than a true spinal column. tunicate, urochord, urochordate – primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva.