Atlantic Deep-sea Lobster vs Cimar Round Ray

Acanthacaris caeca compared with Urotrygon cimar

Key Differences

• Atlantic Deep-sea Lobster is Least Concern while Cimar Round Ray is Near Threatened.

Taxonomic Classification

Rank	Atlantic Deep-sea Lobster	Cimar Round Ray
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Chordata (Chordates)
Class	Malacostraca (Crustaceans)	Elasmobranchii
Order	Decapoda (Decapoda)	Myliobatiformes (Myliobatiformes)
Family	Nephropidae	Urotrygonidae
Genus	Acanthacaris	Urotrygon
Species	Acanthacaris caeca	Urotrygon cimar

Evolutionary Relationship

Atlantic Deep-sea Lobster and Cimar Round Ray share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Atlantic Deep-sea Lobster

LC — Least Concern

Cimar Round Ray

NT — Near Threatened

Physical Characteristics

Attribute	Atlantic Deep-sea Lobster	Cimar Round Ray
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Atlantic Deep-sea Lobster

Habitat

Typically found in marine, freshwater, and terrestrial environments.

Cimar Round Ray

Atlantic Deep-sea Lobster

The Atlantic Deep-sea Lobster (Acanthacaris caeca) is a species in the genus Acanthacaris. It is currently classified as Least Concern on the IUCN Red List. Typically found in marine, freshwater, and terrestrial environments.

Cimar Round Ray

The Cimar round ray (Urotrygon cimar) is a small stingray in the family Urotrygonidae, found in the eastern Pacific Ocean along the coasts of Central America and northern South America, including the waters of Costa Rica, Panama, Colombia, and Ecuador. It inhabits shallow coastal and estuarine waters over sandy and muddy bottoms, typically at depths of less than 50 meters, where it feeds on small benthic invertebrates and fish. Like other round rays in the genus Urotrygon, it has a nearly circular disc outline, a relatively slender tail, and a venomous caudal spine used defensively against predators. The species is classified as Near Threatened by the IUCN, reflecting its restricted range, vulnerability to coastal habitat degradation, and incidental capture in artisanal and commercial fisheries throughout its range. Bycatch in shrimp trawls and gill nets represents a significant ongoing threat to Urotrygon species throughout the eastern Pacific. Shallow coastal habitats in Central America and Colombia face continued pressure from development, mangrove loss, and pollution. The species' reproductive biology, like that of most Urotrygon rays, involves ovoviviparity, with females giving birth to live young after internal development. Population assessments for this species remain limited, and more data on abundance and mortality rates are needed.