Question

mention the habitat of amphioxus

Answer 1

Amphioxus has long been of considerable interest to zoologists and there has been a great deal of investigation into its structure and development. While there is no basic chordate type, Amphioxus, the lancelet is closet to our idea of the primitive ancestors of the craniates. In addition to its chordate characters it has many primitive and many specialized features. It is perhaps best regarded as a modern chordate which has diverged relatively little from a more generalized common chordate ancestor.

Answer 2

9Hey user...

The lancelets — also known as amphioxi(singular, amphioxus) consist of about 32 species[2] of fish-like marine chordates in the order Amphioxiformes. They are distributed in shallow and coastal temperate (as far north as Norway[3]), subtropical and tropical seas around the world, usually found half-buried in sand.[4] The only exception is Asymmetron inferum, a species known from the vicinity of whale falls at a depth of sea.

Branchiostomiformes[5]

They are the modern representatives of the subphylum Cephalochordata, formerly thought to be the sister group of the craniates.[6] In Asia, they are harvested commercially as food for humans and domesticated animals. They are an important object of study in zoology as they provide indications about the evolutionary origins of the vertebrates. Lancelets serve as an intriguing comparison point for tracing how vertebrates have evolved and adapted. Although lancelets split from vertebrates more than 520 million years ago, their genomes hold clues about evolution, particularly how vertebrates have employed old genes for new functions.[7] They are regarded as similar to the archetypal vertebrate form.

The first representative organism of the group to be described was Branchiostoma lanceolatum. It was described by Peter Simon Pallas in 1774 as molluscan slugs in the genus Limax. It was not until 1834 that Gabriel Costa brought the phylogenetic position of the group closer to the agnathan vertebrates (hagfish and lampreys), including it in the new genus Branchiostoma (from the Greek, branchio = "gills", stoma = "mouth").[8] In 1836, Yarrel renamed the genus as Amphioxus (from the Greek: "pointed on both sides"), now considered an obsolete synonym of the genus Branchiostoma. Today, the term "amphioxus" is still used as a common name for the Amphioxiformes, along with "lancelet", especially in the English language.

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