Notochord, endoderm, mesoderm and ectoderm. Though after the larval stage they change and become attached filter feeders.
Examples of protochordata are Balanoglossus,Herdmania and Amphioxus.
No, hemichordata and protochordata are not the same. Hemichordata is a phylum of marine deuterostome animals, while Protochordata is a subphylum of chordates that includes organisms like tunicates and lancelets. Both groups are primitive chordates but belong to different taxonomic classifications.
The common name for subphylum Urochordata is tunicates or sea squirts. These marine animals are characterized by their cylindrical bodies encased in a tough tunic made of cellulose.
Tunicates have a notochord in early development and they have an organ/tissue-level of organization, and this organ/tissue development puts them in the same phylum as humans
No, the phylum Chordata includes both vertebrate and invertebrate animals. Vertebrates are a subphylum within Chordata and have a backbone or spinal column, whereas invertebrate chordates, like tunicates and lancelets, lack a backbone.
Some of these non-chordates are marine animals. These animals are without a backbone. Some of these animals are... Fish Coral Sea-Aneamone
Cephalochordates e.g. Amphioxus ,; tunicates , acorn worms etc. are nonvertebrate chordates , they are collctively called protochordates .
tunicates and lanceletes
There isn't a "popular name" for them. The most familiar chordates are the vertebrates, but not all chordates are vertebrates (tunicates, for example, are chordates).
Lower chordates refer to a group of simple, marine invertebrate animals that belong to the phylum Chordata but do not possess a backbone or vertebral column. Examples of lower chordates include tunicates, lancelets, and hagfish. They are considered primitive chordates with some characteristics of vertebrates.
chordates
Tunicates and lancelets are common to humans in that all of them are chordates. That is they share certain charcteristics at some point in their lives. Four traits that they all share are notochord, hollow dorsal nerve chord, post anal tail, and pharyngeal gill slits. Some of these characteristics disappear during development, others are retained.
Examples of protochordata are Balanoglossus,Herdmania and Amphioxus.
Phylum Chordata simply consists of all animals that, at least in their embryonic phase, have a structure called the notochord. In the vertebrates, the notochord develops into the vertebrae, i.e. the backbone. Some primitive chordates, though, including the tunicates, lancelets, and hagfish, do not ever develop vertebrae, although they have/have had a notochord. Hence, Subphyla Urochordata and Cephalochordata, and Class Myxini are invertebrate chordates.
Not necessarily. While some chordates, like humans and other mammals, have relatively large brains compared to their body size, not all chordates have large brains. Chordates range in complexity from simple organisms like tunicates to more advanced vertebrates like birds and primates.
The only vertebrate phylum is Chordata. All animals with backbones, or any bones at all, are chordates. Tunicates, which are filter feeding invertebrates with a spinal nerve but no bones, are also chordates.
No. They are both chordates, which means during embryonic development they have a notochord, the same as vertebrates. This does not persist in tunicates, but it does in lancelets (adults still have a notochord). Neither tunicates or lancelets have a backbone.