Poecilosclerida
Poecilosclerida is an order of sponges belonging to the class Demospongiae. They are characterized by having a skeleton composed of siliceous spicules, which are small, needle-like structures. The spicules of Poecilosclerida are often arranged in a complex and intricate pattern, giving them a unique and often beautiful appearance. They are commonly known as poecilosclerid sponges or spiny sponges.
Characteristics
Poecilosclerida sponges are typically small to medium in size, and they can be found in a variety of colors, including yellow, orange, red, brown, and gray. They are often encrusting or massive in form, and they may be covered in a layer of fine, hair-like spicules called toxa. The spicules of Poecilosclerida can be classified into different types, including megascleres and microscleres. Megascleres are the larger spicules, and they are typically used for structural support. Microscleres are the smaller spicules, and they are typically used for defense or for providing additional support to the sponge's skeleton.
Environments
Poecilosclerida sponges are found in a wide range of marine habitats, including coral reefs, rocky shores, and deep-sea environments. They are typically found in areas with strong currents, as they are able to filter food from the water. Some species are also found in brackish water or even freshwater habitats.
References
For further information on Poecilosclerida, consult the following sources: