Overview. Lorisidae (sometimes written Loridae) is a small family of primates that includes the slow lorises, slender lorises, pottos and angwantibos. Members of this family are strepsirrhine primates that physically resemble lemurs in some features such as large eyes and a toothcomb, but they are a distinct lineage. Lorisids are mainly arboreal, nocturnal animals found in tropical forests of Africa and Asia. Depending on the taxonomic treatment, the family comprises about nine to eleven recognized species divided among roughly five genera.

Physical characteristics and behaviour

Lorisids are generally small-bodied, with large forward-facing eyes adapted for night vision and a mobile head that aids in scanning for prey. They have a strong, grasping grip and limbs built for deliberate climbing rather than leaping; some species can hang from a branch with a single limb for extended periods. Typical features include a reduced or absent tail (varies by genus), a dental comb used in grooming, and a grooming claw on the second toe. Diets are varied: many lorisids eat insects, small vertebrates, tree gums, nectar and fruit.

Genera and notable members

  • Arctocebus — angwantibos, small African lorisids with insectivorous habits.
  • Perodicticus — pottos, stout-bodied African species adapted to slow, careful climbing.
  • Pseudopotto — the "false potto," a controversial taxon sometimes proposed to represent a distinct lineage.
  • Loris — slender lorises of South Asia; see Loris for the nominate genus and its species.
  • Nycticebus — slow lorises of Southeast Asia, notable for their slow deliberate movements and often cryptic coloration.

Evolution and classification

Lorisidae belong to the infraorder Lorisiformes, which is closely related to the galagos (bushbabies). Molecular and morphological studies place lorisids as an ancient branch of the strepsirrhine primates. The fossil record is sparse compared with some other groups, but comparative anatomy and genetics show long-standing divergence between African and Asian lineages. Taxonomy remains active: new molecular data and more detailed field studies occasionally lead to revisions in species limits and relationships.

Conservation and human interactions

Many lorisid species face significant threats from habitat destruction, fragmentation, hunting, and the illegal live-animal trade. Slow lorises (genus Nycticebus) are also targeted for the pet trade and for use in traditional medicine. Some slow lorises possess a unique defense: a secretion from a brachial gland that, when mixed with saliva, can act as an irritant or toxin — an uncommon trait among primates. Conservation efforts focus on habitat protection, law enforcement against trade, and public education. Detailed species accounts and conservation status are maintained by national authorities and international bodies; further reading and species lists are available through specialist resources (primates overview).

Notable facts. Lorisids' combination of nocturnal adaptations, slow deliberate movement, and strong arboreal grasp is an unusual evolutionary solution among primates, making them of special interest to researchers studying locomotion, sensory ecology and the evolution of nocturnality in mammals.