The genus includes 18 formally described species , and several yet undescribed species , which include a number of species commonly kept in cichlid aquariums such as '' L. caeruleus '' ( electric yellow ) .
The genus includes 18 formally described species , and several yet undescribed species . 
 It includes a number of species commonly kept in cichlid aquariums such as '' L. caeruleus '' ( electric yellow ) .