Parasphaerasclera
Parasphaerasclera is a genus of calcareous sponges in the family Sphaerospongidae. It is a monotypic genus containing the single species Parasphaerasclera cyathophora. This species is characterized by its unique spherical shape and a central cavity lined with a single layer of cells. Its skeleton is composed of radially arranged spicules, which are microscopic, needle-like structures that provide structural support for the sponge.
Common Names
Parasphaerasclera cyathophora is commonly referred to as the "cup-bearing spherical sponge" due to its distinctive cup-shaped structure.
Characteristics
Key characteristics of Parasphaerasclera cyathophora include:
- Spherical shape: The sponge has a perfectly spherical body.
- Central cavity: A large central cavity, called the atrium, is present within the sphere.
- Single-layered epithelium: The atrium is lined by a single layer of epithelial cells.
- Radially arranged spicules: The skeleton of the sponge is composed of radially arranged spicules, which are composed of calcium carbonate.
- Small size: The sponge is typically small, with a diameter ranging from a few millimeters to a few centimeters.
Environments
Parasphaerasclera cyathophora has been found in various marine environments, including:
- Tropical and subtropical waters: The species has been reported from the Indo-Pacific region and the Caribbean Sea.
- Shallow reef habitats: It is often found in shallow water habitats, such as coral reefs and seagrass meadows.
- Subtidal zones: The sponge can also be found in subtidal zones, below the low tide mark.
References
WoRMS - World Register of Marine Species
National Center for Biotechnology Information (NCBI)