The Orang-utang Crab, Orangutang Crab, scientifically known as Achaeus japonicus, is a fascinating crustacean found in marine environments. This crab, characterized by its unique appearance and intriguing behavior, holds a captivating place in the world of marine biodiversity.
Description & Characteristics
Achaeus japonicus is a distinctive crab with a striking appearance. It exhibits a flattened, orangish-red carapace, or shell, with a characteristic elongated rostrum, resembling a pointed beak. Its legs are covered in dense, hairy growth, giving it a somewhat shaggy look. This crab can reach a maximum size of around 10 centimeters in width, making it a relatively small species. Its unique features and colorful shell contribute to its appeal among marine enthusiasts.
Habitat and Occurrence
The Orang-utang Crab, Orangutang Crab, Achaeus japonicus, is a common inhabitant of the Indo-Pacific region. It is typically found in coastal areas and intertidal zones, where it thrives in rocky and coral reef environments. Its depth range extends from the shallows to depths of around 50 meters. This crab prefers areas with ample cover, such as crevices and caves, where it can hide from predators. The species can be found in diverse marine zones, including the neritic zone, which encompasses the coastal waters over the continental shelf. It’s also known to occur in the epipelagic zone, which comprises the sunlit surface layer of the ocean. This adaptability allows the Orang-utang Crab to inhabit a wide range of environments within the Indo-Pacific region.
Taxonomy
Achaeus japonicus belongs to the Class: Malacostraca, Order: Decapoda, and Family: Inachidae. The Class Malacostraca encompasses a broad range of crustaceans, including crabs, lobsters, and shrimp. The Order Decapoda is characterized by the presence of ten walking legs, a defining feature of crabs, lobsters, and other related species. The Family Inachidae, to which Achaeus japonicus belongs, includes a diverse group of spider crabs, known for their long, spindly legs.
Feeding
Achaeus japonicus is an omnivorous crab, meaning it feeds on both plant and animal matter. Its diet includes a variety of food sources, such as brine shrimp nauplii, brine shrimps, detritus, flakes, and zooplankton. These diverse food items provide the necessary nutrients for its growth and survival in the marine environment. It’s a fascinating example of how different marine species have evolved to exploit various food sources within their ecosystem.
Image References