Trichomycteridae is a family of catfishes (order Siluriformes) commonly known as the pencil or parasitic catfishes. This family includes the infamous candirú fish, feared by some people for its habit of entering into the urethra of humans. This family is prohibited to import into various parts of the USA. Taxonomy Trichomycteridae comprises about 41 genera and 207 species. It is the second-most diverse family of the superfamily Loricarioidea. Numerous species still remain undescribed. A… (More on Trichomycteridae)