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Neolamprologus helianthus
This stunning species was only described in 1997 and is included in the so-called "Brichardi complex", which also includes N. brichardi, crassus, falcicula, gracilis, pulcher, savoryi and splendens. The species should not be mixed in aquaria as they will hybridise freely. N. helianthus can be distinguished from others in the complex by its overall yellow-orange patterning and v-shaped cheek marking….
http://www.seriouslyfish.com/species/search/neolamprologus+helianthus
Neolamprologus olivaceous
This
species is included in the so-called “Brichardi complex”, which also includes
N. brichardi,
crassus,
falcicula,
gracilis,
pulcher,
savoryi and
splendens. These should not be mixed in aquaria, as they will hybridise freely.
N. olivaceous can be distinguished from others in the complex by the two curved markings on the
gill cover. It is possible that it is
synonymous with
N. pulcher, as proposed by Konings (1993).
http://www.seriouslyfish.com/species/neolamprologus-olivaceous/