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২৭ এপ্রিল, ২০২১ ০৪:০৪ পূর্বাহ্ণ
Branchiostoma
ধরনঃ মাদ্রাসা শিক্ষা
শ্রেণিঃ অষ্টম
বিষয়ঃ বিজ্ঞান
অধ্যায়ঃ প্রথম অধ্যায়
Branchiostoma
Branchiostoma is one of the few living genera of lancelets (order Amphioxiformes). It is the type genus of family Branchiostomidae.
| Branchiostoma | |
|---|---|
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| Branchiostoma lanceolatum from Belgium | |
Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Leptocardii |
| Order: | Amphioxiformes |
| Family: | Branchiostomidae |
| Genus: | Branchiostoma Costa, 1834 |
| Type species | |
| Branchiostoma lanceolatum (Pallas, 1774) | |
| Diversity | |
| About 11 species | |
| Synonyms | |
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Anatomical diagram of B. lanceolatum (click for description)
These small vaguely eel- or snake-like animals are close relatives of vertebrates. The scientific name means "gill-mouth", referring to their anatomy – unlike vertebrates, they do not have a true head (with a skull capsule, eyes, nose, a well-developed brain etc.), but merely a mouth adjacent to the gill-slits, with the slightly enlarged anterior end of the dorsal nerve cord above and in front of them. It dislikes the light.
Like all lancelets, they are filter feeders that hide in the sediment most of the time. The genus inhabits coastal waters throughout the world.
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