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What are the characteristics of subphylum Urochordata?

What are the characteristics of subphylum Urochordata?

Characteristics of Urochordata:

  • Possesses a Notochord, a hollow nerve cord and a post anal tail.
  • Body has more than two cell layers and includes tissues and organs.
  • Has a U shaped gut.
  • Body has no coelomic body cavity.
  • Body wholly enclosed in a ‘tunic’ of secreted protein and cellulose-like material.

What are the differences in characteristics between Urochordata and Cephalochordata?

The main difference between Urochordata and Cephalochordata is the location and presence of notochord. In urochordates, the notochord is present in the larval tail, whereas, in cephalochordates, the notochord is present throughout the life and extends from the head to the tail region.

What are the characteristics of cephalochordates?

Cephalochordata. Members of Cephalochordata possess a notochord, dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail in the adult stage. They do not have a true brain, but the notochord extends into the head, which gives the subphylum its name ( “cephalo” is Greek for head).

Is Cephalochordata a phylum?


What organisms are found in subphylum Cephalochordata?

Cephalochordata A subphylum or phylum of chordates that contains only the lancelets, a group of small invertebrate marine fishlike animals. There are 23 species in two genera – Branchiostoma (Amphioxus) and Epigonichthys.

How is Subphylum Cephalochordata different from subphylum Urochordata?

The three subphyla of the phylum Chordata are Urochordata, Cephalochordata, and Vertebrata. The main difference between Urochordata and Cephalochordata is that Urochordata consists of a notochord extended in the head region whereas Cephalochordata contains the notochord in the posterior region of the body.

What does the subphylum Vertebrata have that Cephalochordata do not have?

General features. The lancelets are also called cephalochordates (Greek: kephale, “head”) because the notochord extends from near the tip of the tail to well into the anterior of the body. Because they do not have the braincase, or cranium, of a vertebrate, lancelets are often called acraniates.

Which of the following belongs to subphylum Cephalochordata?

Option A: Amphioxus, also called Branchiostoma is a member of the Cephalochordata. They possess segmented elongated bodies, notochord that extends the length of the body, extending from head to tail, persisting throughout the animal’s life, dorsal hollow nerve cord, pharyngeal slits, post-anal tail.

In which Subphylum Cephalochordata is included?


Cephalochordates Temporal range: Cambrian Stage 3–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Kingdom: Animalia
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Cephalochordata Haeckel, 1866

What is the definitive characteristic that gives craniates their own sub phylum?

The notochord extends into the head, which gives the subphylum its name. Although the neural tube also extends into the head region, there is no well-defined brain, and the nervous system is centered around a hollow nerve cord lying above the notochord.

What is Urochordata and what are its characteristics?

The Urochordata are a medium sized group of around 2,000 species of marine animals, commonly referred to as Sea Squirts, Tunicates, Salps and Larvaceans . They are all filter feeders, using a basically similar mechanism of pumping water through a perforated (having holes in it) pharynx which collects small particles in a layer of mucous.

What are the four characteristics all Chordata must possess?

Characteristic Features of Phylum Chordata They are bilaterally symmetrical and triploblastic. Chordates are coelomate and show an organ system level of organisation. They have the characteristic notochord, dorsal nerve cord, pharyngeal slits. Also, they have a post-anal In this phylum, the nervous system is dorsal, hollow and single. The heart is ventral, with a closed circulatory system.

What subphylum are chordates in?

Chordate, any member of the phylum Chordata , which includes the vertebrates (subphylum Vertebrata), the most highly evolved animals, as well as two other subphyla-the tunicates (subphylum Tunicata) and cephalochordates (subphylum Cephalochordata). Some classifications also include the phylum Hemichordata with the chordates.

What are characteristics tunicates make them chordates?

The characteristic features of Chordata are a notochord , a dorsal hollow nerve cord, pharyngeal slits , and a post-anal tail . Chordata contains two clades of invertebrates: Urochordata (tunicates) and Cephalochordata (lancelets), together with the vertebrates in Vertebrata. Most tunicates live on the ocean floor and are suspension feeders.