Macroplax

Macroplax is a genus of crabs belonging to the family Macrophthalmidae. These small crabs are typically found in intertidal and shallow subtidal environments in the Indo-Pacific region.

Characteristics:

• Morphology: Macroplax crabs are characterized by a square-shaped carapace, which is often broader than it is long. The eyestalks are typically short and do not extend beyond the lateral margins of the carapace. The chelipeds (claws) are usually equal in size.
• Habitat: They are commonly found in muddy or sandy substrates, often near mangrove forests or estuaries.
• Behavior: Macroplax crabs are burrowing animals, creating small tunnels in the sediment. They are detritivores, feeding on organic matter present in the sediment.

Taxonomy:

The genus Macroplax contains several species, which are distinguished by subtle differences in carapace shape, cheliped morphology, and the arrangement of granules or spines on the carapace. Taxonomic classification within the Macrophthalmidae family can be complex, and revisions have occurred based on morphological and molecular data.

Distribution:

Macroplax species are distributed throughout the Indo-Pacific region, including areas such as Australia, Southeast Asia, and parts of the Indian Ocean.

Ecological Significance:

Macroplax crabs play a role in the benthic ecosystem by bioturbating the sediment and contributing to nutrient cycling. They are also a food source for larger predators, such as fish and birds.