47, 48), belong to the genera Chromis, Barbus, Capoeta, Discognathus, Nemachilus, Blennius and Clarias; and there is a great affinity between them and the fish of the East African lakes and streams. There are eight species of Chromis, most of which hatch their eggs and raise their young in the buccal cavities of the males.
(the Central Asian Nemachilus siluroides).
They mostly live in small streams and ponds, and many are mountain forms. They are almost entirely confined to Europe and Asia, but one species (Nemachilus abyssinicus) has recently been discovered in Abyssinia.
Only two species occur in Great Britain: the common Nemachilus barbatulus and the rarer and more local Cobitis taenia.