What are the characteristics of Cephalochordata?
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).
What is special about Cephalochordata?
Several features unique to cephalochordates and vertebrates suggest that they are “sister groups” more closely related to each other than either is to other chordates. These features include the segmented musculature and its innervation, the pattern of circulation, and several biochemical features.
Is amphioxus a Cephalochordata?
amphioxus, plural amphioxi, or amphioxuses, also called lancelet, any of certain members of the invertebrate subphylum Cephalochordata of the phylum Chordata. Amphioxi are small marine animals found widely in the coastal waters of the warmer parts of the world and less commonly in temperate waters.
What are the characteristics of members of subphylum Urochordata and Cephalochordata?
Urochordata and Cephalochordata are two subphyla of the phylum Chordata. Thus, both urochordates and cephalochordates consist of pharyngeal gill slits, a notochord, a dorsal, hollow, nerve cord, and a post-anal tail.
What is phylum Cephalochordata?
Chordate
Cephalochordate/Phylum
Which of the following belongs to subphylum Cephalochordata?
Asymmetron (also called Epigonichthyes) and Amphioxus (also called Branchiostoma) are cephalochordates.
Are cephalochordates hermaphrodite?
5.8 Cephalochordates and Urochordates Ascidians (sea squirts) are mostly hermaphroditic urochordates that produce self-sterile gametes due to the presence of a self-incompatibility system (Monne et al., 2006; Sawada et al., 2004).
What phylum is amphioxus?
Lancelet/Phylum
What is the main difference 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.
In what way are Cephalochordata different from Urochordata?
The key difference between Urochordata and Cephalochordata is based on their notochord extension. In Urochordata, the notochord is extended towards the posterior part, forming a tail in the larval stages. In Cephalochordata, the notochord is extended to the anterior part.
Which of the following belong to subphylum Cephalochordata?
Option A: Amphioxus, also called Branchiostoma is a member of the Cephalochordata.
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.
What is the alternative name for the amphioxi?
Alternative Titles: amphioxi, amphioxuses, lancelet. Amphioxus, plural amphioxi, or amphioxuses, also called lancelet, any of certain members of the invertebrate subphylum Cephalochordata of the phylum Chordata.
Where do cephalochordates live in the world?
Cephalochordates are diagnosed by the presence of segmented muscle blocks. The lancelets are marine organisms that live in shallow, tropical and temperate seas surrounding all the continental land masses except Antarctica.
What kind of reproductive system does a cephalochordate have?
Generally, cephalochordates are separate sexes (gonochoric) and have great reproductive ability. The females develop yellow gonads, whereas the males have pale white gonads (Figure 1.4). In the review of amphioxus by Garcia-Fernandez and Benito-Gutierrez (2009), the reproduction and development of amphioxus have been well described.
Where can amphioxus be found in the world?
Amphioxi are small marine animals found widely in the coastal waters of the warmer parts of the world and less commonly in temperate waters. Both morphological and molecular evidence show them to amphioxus, any of certain members of the invertebrate subphylum Cephalochordata of the phylum Chordata.