Caridina lanceolata is a species of small freshwater shrimp belonging to the genus Caridina in the family Atyidae. Like many other members of its genus, it is known for its role as a detritivore and grazer in its aquatic ecosystem.
Taxonomy and Etymology
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Malacostraca
- Order: Decapoda
- Family: Atyidae
- Genus: Caridina
- Species: Caridina lanceolata
The specific epithet "lanceolata" is Latin, meaning "lance-shaped" or "spear-shaped," likely referring to a distinctive morphological feature of the shrimp, such as its rostrum (the anterior projection of the carapace).
Distribution and Habitat
Caridina lanceolata is an endemic species, meaning it is found exclusively in a specific geographic area. Its native range is restricted to Lake Matano (Danau Matano), one of the ancient Malili Lakes in Sulawesi, Indonesia. This region is a global biodiversity hotspot for freshwater invertebrates, particularly shrimp and snails, due to its long history of isolation and unique geological conditions.
Lake Matano is characterized by its clear, oligotrophic (nutrient-poor) waters and rocky substrates. C. lanceolata typically inhabits the benthic zone, where it can be found among submerged rocks, leaf litter, and vegetation. These habitats provide both shelter and a source of food.
Description
As with many other Caridina species from Sulawesi, C. lanceolata is a relatively small shrimp, typically reaching an adult size of approximately 1.5 to 3 centimeters (0.6 to 1.2 inches). Its coloration can vary, though specific details regarding its patterns are less frequently documented compared to more vibrantly colored Sulawesi shrimp species. The distinguishing morphological features, particularly the shape of its rostrum and other appendages, are critical for its identification.
Diet and Behavior
Caridina lanceolata is primarily an omnivorous detritivore and grazer. It feeds on biofilm, microalgae, diatoms, and decaying organic matter that accumulates on submerged surfaces. Like other Caridina shrimp, it uses its specialized filter-feeding appendages to sift food particles from the water column or scrape food from rocks and plants. They are generally peaceful and spend their time foraging for food.
Aquarium Trade and Conservation Status
While many species of Sulawesi shrimp, particularly those from Lake Matano, are highly prized in the freshwater aquarium hobby for their unique colors and patterns (e.g., Cardinal Shrimp, Caridina dennerli), Caridina lanceolata is less commonly encountered in the international aquarium trade. This may be due to its less striking coloration or specific collection challenges.
The conservation status of Caridina lanceolata is currently listed as Data Deficient (DD) by the IUCN Red List (assessment from 2013). This designation indicates that there is insufficient information to properly assess its risk of extinction. However, like all endemic species of the Malili Lakes, C. lanceolata faces significant threats from:
- Habitat degradation: Caused by pollution from mining, agriculture, and human settlements around the lake.
- Invasive species: Introduction of non-native fish and plant species can disrupt the delicate ecosystem balance.
- Climate change: Alterations in water temperature and quality could impact this sensitive species.
Due to its extremely limited geographic range, C. lanceolata is highly vulnerable to these environmental pressures, and conservation efforts focused on protecting the pristine environment of Lake Matano are crucial for its survival.