Essay Good Horse Invertebrate Vertebrate

Sponges, placozoans, and comb jellies have at times been touted as “the first animals,” but which of these groups most closely resembles the ancestor of multicellular animals is not yet known. All the members of the animal kingdom include in these two groups, vertebrates and invertebrates.

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The relationships of xenoturbellids are still uncertain, but recent evidence links them to acoel worms.

The Protostomia are a large group that includes many marine, worm-like animals, as well as parasites and highly diverse, complex groups like mollusks (snails, mussels, squid and relatives) and arthropods (insects, crustaceans, spiders and relatives).

This is true particularly in animals that have taken up very specialized ways of life, like internal parasites which often experience a reduction or loss of major organ systems over time.

While molecular genetic studies are also hampered by long periods of evolutionary divergence, they provide large amounts of data that can be subjected to advanced analyses taking into account patterns of molecular evolution.

This means that vertebrates are really just a very special group of invertebrates.

Due to the bony skeleton and the fancy nervous system it can support, some of the largest, smartest, and most conspicuous animals have evolved in the vertebrate lineage.Many invertebrates also live in habitats that people don’t see very often.For example under water in oceans, streams, and ponds, in the soil, in the canopies of trees, or as parasites inside other animals.Why do most people know so little about invertebrates?It may be because most of them are relatively small.When most people think of animals, they think of things like mammals or birds, or maybe lizards, frogs, or fishes.All these familiar animals, along with humans, are part of a group called vertebrates or Vertebrata.There are some really large invertebrates, like the colossal squid, which can weigh almost 500 kg (over 1000 lb), or the bootlace worm, which can be over 55 m (180 ft) long.But most invertebrates are small and some are so tiny that they are barely visible to the naked eye.This was a very difficult task, because most animal phyla arose in the very distant past, during the Cambrian radiation, more than 500 million years ago. Much evolution has happened since, modifying anatomy and developmental processes in diverging animal lineages, and obscuring characteristics shared among related groups. Higher-level metazoan relationships: Recent progress and remaining questions.

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