October 18, 2017

Mollusks

Mollusk

Mollusks are invertebrates that live in ocean, freshwater and terrestrial habitats. It is estimated that there are as many as 120,000 different species of mollusk. There are several different classes of mollusk. The most common mollusks are the gastropods (e.g., snails and slugs), the cephalopod … [Read more...]

Fish

Fish

The fish family includes a wide variety of vertebrate animals that live in the water. Although there are over 31,500 different types of fish, with many diverse characteristics, the one thing that fish have in common is that they breathe oxygen from the water through gills. Fins are also a common … [Read more...]

Echinoderms

Sea Star or Starfish

Echinoderms are a type of invertebrate found in marine or ocean environments. Common echinoderms include the sea star, sea urchin, sand dollar and sea cucumber. Most echinoderms have arms or spines that radiate from the center of their body. The central body contains their organs, such as mouth for … [Read more...]

Crustaceans

Crab

Crustaceans are a type of invertebrate, meaning they don't have an internal skeleton. They are also part of the arthropod family of animals. The term arthropod comes from the Greek word meaning "jointed feet," and includes other similar animals such as insects and arachnids. Even if you are not … [Read more...]