Cherax pulcher is a species of freshwater crayfish in the family Parastacidae, belonging to the genus Cherax. It is endemic to the Bird’s Head Peninsula in West Papua, Indonesia. The species was formally described in 2015 by German carcinologist Christian Lukhaup, although it had been known in the international aquarium trade for several years prior under names such as "Cherax sp. Hoa Creek" or "Blue Moon."
Taxonomy and Etymology
The species was identified as distinct from other members of the genus Cherax through morphological comparisons and DNA analysis. The specific epithet pulcher is derived from the Latin word for "beautiful," a reference to the vivid and multi-colored shell that distinguishes the species from its congeners.
Physical Characteristics
Cherax pulcher is characterized by its striking coloration, which typically includes shades of bright blue, pink, and purple. The cephalothorax and abdomen often exhibit a gradient of these colors, with the chelae (claws) usually appearing deep blue with white or light-colored outer margins.
The species displays sexual dimorphism; males typically possess larger chelae than females. Adult specimens generally reach a body length of approximately 7 to 10 centimeters, excluding the claws. Morphologically, it is closely related to Cherax boesemani, but it can be distinguished by the shape of its rostrum and the specific patterning of its carapace.
Distribution and Habitat
The known natural range of Cherax pulcher is highly localized. It is found in Hoa Creek, located near the village of Teminabuan in the South Sorong Regency of West Papua. The habitat consists of clear, slow-moving freshwater streams with a substrate of sand and stones, often shaded by dense canopy cover.
Conservation Status and Human Interaction
While not yet formally assessed by the IUCN Red List, researchers have expressed concern regarding the conservation of Cherax pulcher. The species is under pressure due to its popularity in the global ornamental fish trade, which has led to significant collection from its limited wild habitat. Additionally, the species faces potential threats from habitat degradation and the encroachment of human activity in the West Papua region. In captivity, it is recognized for its unique aesthetic, though it requires specific water parameters and temperatures consistent with its tropical origin.