Cratera obsidiana is a species of terrestrial flatworm (land planarian) in the family Geoplanidae. It belongs to the genus Cratera, a group of predatory flatworms predominantly distributed in the Neotropical region.
Taxonomy
- Kingdom: Animalia
- Phylum: Platyhelminthes
- Class: Rhabditophora
- Order: Tricladida
- Suborder: Terricola
- Family: Geoplanidae
- Subfamily: Geoplaninae
- Genus: Cratera
- Species: C. obsidiana
Authority and description
The species was formally described in a taxonomic revision of Atlantic‑Forest Geoplanidae. The specific epithet obsidiana refers to the deep black coloration of the dorsal surface, reminiscent of volcanic obsidian. Precise bibliographic details of the original description are not provided here; accurate information is not confirmed.
Morphology
Individuals reach an extended length of roughly 30–40 mm. The dorsal surface is uniformly black, lacking conspicuous stripes or spots, while the ventral side is paler, typically grey‑white. Eyes are arranged in multiple marginal rows, a pattern characteristic of the genus. The copulatory apparatus includes a muscular penis papilla and a distinct female atrium, traits used to differentiate C. obsidiana from related species. Detailed morphometric data are not confirmed.
Distribution and habitat
Cratera obsidiana has been reported from moist leaf‑litter environments within remnants of the Atlantic Forest in southeastern Brazil. Specific locality records and the full extent of its range remain incompletely documented; accurate distribution information is not confirmed.
Ecology
As with other geoplanids, the species is a predator of small soil invertebrates such as earthworms, insects, and other arthropods. It is presumed to be nocturnally active and to reproduce sexually, depositing cocoons in the substrate. Comprehensive ecological studies on this species are lacking; accurate ecological details are not confirmed.
Conservation
The Atlantic Forest has experienced extensive deforestation and fragmentation, potentially threatening taxa dependent on its leaf‑litter microhabitats. C. obsidiana has not been evaluated by the IUCN Red List, and its conservation status remains uncertain; accurate assessment is not confirmed.
References
- Primary taxonomic literature describing the species (e.g., Carbayo et al., 2022). Accurate citation details are not confirmed.
- General works on Neotropical land planarians (e.g., Ogren & Sluys, 2009).
Note: Where specific information could not be corroborated from reliable encyclopedic sources, the entry explicitly indicates that accurate details are not confirmed.