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Lancelet

Lancelet

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2023-07-18 Snargl 0 minute 0 second

What kind of animal is Lancelet?

A lancelet is a type of animal that belongs to the subphylum Cephalochordata, which is a group of primitive chordates.
Lancelets have a notochord, a dorsal hollow nerve cord, an endostyle, pharyngeal slits, and a post-anal tail.
These are the five features that all chordates share at some point in their development.
Lancelets live in shallow marine habitats, where they burrow in the sand and filter-feed on plankton.
They have no eyes, ears, brain, or skeleton.
They are also known as amphioxi or Branchiostoma.
Lancelets are important for studying the evolution of vertebrates, as they resemble some of the earliest chordate fossils.

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Where does the Lancelet live?

The lancelet is a small, fish-like animal that belongs to the subphylum Cephalochordata, which is one of the groups of chordates.
The lancelet lives in the marine environment, in shallow subtidal sand flats.
It can be found in temperate, subtropical, and tropical seas around the world, except for the polar regions.
The lancelet prefers sand mixed with shells rather than more muddy bottoms, as it is not suited to penetrate ground with small particles.
The lancelet burrows into the sand with its posterior end, leaving only its anterior end exposed to the water.
It feeds by filtering plankton from the water using its pharyngeal slits and a mucous sheet.
The lancelet can swim, but it is mostly benthic, meaning that it lives on the bottom of the sea.
It can tolerate temperature, from 3 to 37 degrees Celsius and from 37 to 99 degrees Fahrenheit.
When disturbed, it quickly leaves its burrow, swims a short distance, and then rapidly burrows again into the sand.
The lancelet is also a source of food for humans in some parts of the world, especially in Asia.
However, some species of lancelets are endangered due to overharvesting, habitat loss, and pollution.

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What does the Lancelet look like?

A lancelet is a small, translucent, eel-like animal that belongs to the subphylum Cephalochordata, which is related to the vertebrates.

A lancelet has a fish-like body shape, with a pointed head and tail, but lacks eyes, fins, scales, or a true backbone.

Instead, it has a flexible rod of cartilage called a notochord that runs along its dorsal side and supports its body.

A lancelet also has a hollow nerve cord above the notochord, a pharynx with slits for filter-feeding, an endostyle that secretes mucus, and a post-anal tail for swimming.

These features are shared by all chordates, including humans, at some stage of their development.

Lancelets live in shallow, sandy, marine habitats, where they burrow into the sediment with only their anterior end exposed.

They feed on plankton and organic particles that they capture with the help of cilia and mucus in their pharynx.

They have a simple circulatory system that distributes nutrients, but no respiratory organs or blood cells.

They have a pair of gonads for reproduction, and release their gametes into the water for external fertilization.

Lancelets are considered to be living fossils, as they resemble some of the earliest chordates that appeared in the Cambrian period, about 530 million years ago.

They are of great interest to zoologists, as they provide clues about the evolution of vertebrates and their body plan.

Lancelets are also harvested as food for humans in some parts of Asia.

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