Chalinochromis
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''Chalinochromis'' is a small
cichlid Cichlids () are a large, diverse, and widespread family of percomorph fish in the family Cichlidae, order Cichliformes. At least 1,760 species have been scientifically described, making it one of the largest vertebrate families, with on ...
genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
from the
subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zo ...
Pseudocrenilabrinae The Pseudocrenilabrinae are a subfamily in the cichlid family of fishes to which, according to a study from 2004, includes all the Middle Eastern and African cichlids with the exception of the unusual '' Heterochromis multidens'' and the Malaga ...
. These
ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...
es are endemic to
Lake Tanganyika Lake Tanganyika ( ; ) is an African Great Lakes, African Great Lake. It is the world's List of lakes by volume, second-largest freshwater lake by volume and the List of lakes by depth, second deepest, in both cases after Lake Baikal in Siberia. ...
in the
East African Rift The East African Rift (EAR) or East African Rift System (EARS) is an active continental rift zone in East Africa. The EAR began developing around the onset of the Miocene, 22–25 million years ago. It was formerly considered to be part of a l ...
. The
scientific name In Taxonomy (biology), taxonomy, binomial nomenclature ("two-term naming system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin gramm ...
refers to the
bridle A bridle is a piece of equipment used to direct a horse. As defined in the ''Oxford English Dictionary'', the "bridle" includes both the that holds a bit that goes in the mouth of a horse, and the reins that are attached to the bit. It prov ...
-like markings across the heads of members of this genus. They have specialized jaws enabling them to feed on
sponge Sponges or sea sponges are primarily marine invertebrates of the animal phylum Porifera (; meaning 'pore bearer'), a basal clade and a sister taxon of the diploblasts. They are sessile filter feeders that are bound to the seabed, and a ...
s. (2007): Phylogenetic relationships of the Lake Tanganyika cichlid tribe Lamprologini: The story from mitochondrial DNA. '' Mol. Phylogenet. Evol.'' 45(2): 629–642. (HTML abstract) This genus has a puzzling relationship with the extremely similar species placed in ''
Julidochromis ''Julidochromis'' is a genus of cichlids in the subfamily Pseudocrenilabrinae. They are commonly called julies and are endemic to Lake Tanganyika in eastern Africa. This genus includes six formally described species, some with a number local v ...
''. In their
mtDNA Mitochondrial DNA (mtDNA and mDNA) is the DNA located in the mitochondria organelles in a eukaryotic cell that converts chemical energy from food into adenosine triphosphate (ATP). Mitochondrial DNA is a small portion of the DNA contained in ...
NADH dehydrogenase NADH dehydrogenase is an enzyme that converts nicotinamide adenine dinucleotide (NAD) from its reduced form (NADH) to its oxidized form (NAD+). Members of the NADH dehydrogenase family and analogues are commonly systematically named using the f ...
subunit 2
sequence In mathematics, a sequence is an enumerated collection of objects in which repetitions are allowed and order matters. Like a set, it contains members (also called ''elements'', or ''terms''). The number of elements (possibly infinite) is cal ...
, ''Chalinochromis'' are closer to '' J. dickfeldi'', '' J. ornatus'' and '' J. transcriptus'' – in particular the latter two – than to any other living fish, while '' J. marlieri'' and '' J. regani'' are closer to '' Telmatochromis''. ''Julidochromis'' thus might need to be split in two, with ''Chalinochromis'' included in one lineage. Alternatively, there has twice been successful intergeneric
hybrid Hybrid may refer to: Science * Hybrid (biology), an offspring resulting from cross-breeding ** Hybrid grape, grape varieties produced by cross-breeding two ''Vitis'' species ** Hybridity, the property of a hybrid plant which is a union of two diff ...
ization between particular lineages of ''Julidochromis'' males and ''Chalinochromis'' females (males generally do not pass on mtDNA to their offspring). Yet another possibility is that ''Julidochromis'' is
monophyletic In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent co ...
and includes ''Chalinochromis''; in this scenario males of the common ancestor of ''J. marlieri'' and ''J. regani'' would have hybridized with females of the common ancestor of ''Telmatochromis''. ''Chalinochromis'' are popular
aquarium An aquarium (: aquariums or aquaria) is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. fishkeeping, Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquati ...
fishes, and require similar care to ''Julidochromis''. Like most lamprologine species, ''Chalinochromis'' are secretive during spawning, often choosing a small cave or crevice to spawn inside. In the aquarium the species often spawns under flat pieces of slate.


Species

The three formally described species in this genus are as follows: * '' Chalinochromis brichardi''
Poll Poll, polled, or polling may refer to: Forms of voting and counting * Poll, a formal election ** Election verification exit poll, a survey taken to verify election counts ** Polling, voting to make decisions or determine opinions ** Polling pla ...
, 1974
* '' Chalinochromis cyanophleps'' S. O. Kullander, Mi. Karlsson, Ma. Karlsson & Norén, 2014Kullander, S.O., Karlsson, M., Karlsson, M. & Norén, M. (2014)
''Chalinochromis cyanophleps'', a new species of cichlid fish (Teleostei: Cichlidae) from Lake Tanganyika.
''Zootaxa, 3790 (3): 425–438.''
* '' Chalinochromis popelini'' Brichard, 1989 The two undescribed species in this genus are as follows: * '' Chalinochromis sp. "bifrenatus"'' * '' Chalinochromis sp. "ndobhoi"''


References

Lamprologini * Cichlid genera Taxa named by Max Poll {{Lamprologini-stub