Skip to main content Skip to main navigation menu Skip to site footer
Type: Article
Published: 2022-04-04
Page range: 296-320
Abstract views: 709
PDF downloaded: 25

Congochromis rotundiceps sp. nov., a new cichlid species (Actinopterygii: Cichlidae) from the Congo Drainage

SNSB-Bavarian State Collection Zoology, Münchhausenstr. 21, 81247 München, Germany
SNSB-Bavarian State Collection Zoology, Münchhausenstr. 21, 81247 München, Germany 2 present address: Zoological Institute, University of Basel, Vesalgasse 1, 4051 Basel, Switzerland
SNSB-Bavarian State Collection Zoology, Münchhausenstr. 21, 81247 München, Germany
Pisces Congochromis new species Central Congo basin Malebo Pool

Abstract

A new dwarf cichlid, Congochromis rotundiceps sp. nov., (Cichliformes: Cichlidae) is described from the central Congo basin. It is a species of Congochromis based on the following characters: (1) four pores in the dentary laterosensory canal; (2) absence of a laterosensory canal in the angulo-articular, (3) six pores in the preopercle laterosensory canal; (4) a single tubular infraorbital bone behind the lachrymal; (5) 12 circumpeduncular scales; (6) jaw teeth comparatively robust, unicuspids, not closely spaced; and (7) presence of a small, supraneural bone. Congochromis rotundiceps sp. nov. is distinguished from all other Congochromis species by the combination of the following characters: (1) a larger eye diameter (31.4–35.1% HL), (2) a shorter snout length (29.8–32.7% HL), (3) a shorter upper lip length (29.2–32.0% HL), (4) a shorter lower lip length (26.2–33.6% HL), (5) a shorter lower lip width (27.7–31.2% HL), and (6) a shorter anal-fin length (15.3–16.97% SL). Diagnostic characters were extracted mainly from meristic counts and distance measurements from 326 chromidotilapiine cichlid specimens representing all chromidotilapiine genera and 40 described or undescribed species. The analysis of the complete meristic and distance measurements database allowed the diagnosis of C. rotundiceps sp. nov., but not for diagnostic separation of many other chromidotilapiine genera, species, and lineages. This result highlights the necessity to explore additional characters to elucidate chromidotilapiine cichlid taxonomy further. 

 

References

  1. Bookstein, F., Chernoff, B., Elder, R., Humphries, J., Smith G. & Strauss, R. (1985) Morphometrics in evolutionary biology. Academy of Natural Sciences of Philadelphia, Philadelphia, 277 pp.
    Boulenger, G. (1898) A revision of the African and Syrian fishes of the family Cichlidae. Part I. Proceedings Zoological Society of London, 1898 (pt 2), 132–152, pl. 19. https://doi.org/10.1111/j.1096-3642.1898.tb03136.x
    Boulenger, G. (1899) Matériaux pour la faune du Congo. Poissons nouveaux du Congo. Troisième Partie. Silures, Acanthoptérygiens, Mastacembles, Plectognathes. Annales du Musee du Congo (Ser. Zoology), (1/3), 39-58, pls. 20–29.
    Boulenger, G. (1902) Contributions to the ichthyology of the Congo. II. On a collection of fishes from the Lindi River. Proceedings of the Zoological Society of London, 1902, 1 (pt 1), 265–271, pls. 28–30.
    Daget, J. (1988) Thysochromis nom. nov. en remplacement de Thysia (Pisces, Cichlidae). Cybium, 12 (1), 97.
    Greenwood, P. (1987) The genera of pelmatochromine fishes (Teleostei, Cichlidae). A phylogenetic review. Bulletin of the British Museum (Natural History) Zoology, 53, 139–203.
    Hammer, Ø., Harper, D. & Ryan, P. (2001) PAST: Paleontological statistics software package for education and data analysis. Palaeontologia Electronica, 4 (1), 1–9.
    Kocher, T. (2004) Adaptative evolution and explosive speciation: The cichlid fish model. Nature Reviews Genetics, 5, 288–298. https://doi.org/10.1038/nrg1316
    Lamboj, A. (1999) Cichlids of the biospere reservation of Dimonika (Mayombe, Congo) with description of two new Chromidotilapia species (Teleostei, Perciformes). Verhandlungen der Gesellschaft für Ichthyologie, 1, 139–156.
    Lamboj, A. & Snoeks, J. (2000) Divandu albimarginatus, a new genus and species of cichlid (Teleostei: Cichlidae) from Congo and Gabon, Central Africa. Ichthyological Exploration of Freshwaters, 11 (4), 355–360.
    Lamboj, A. (2003) Chromidotilapia melaniae and C. nana, two new cichlid species (Perciformes, Cichlidae) from Gabon, Central Africa. Zootaxa, 143, 1–15. https://doi.org/10.11646/zootaxa.143.1.1
    Lamboj, A. (2001) Revision des Chromidotilapia batesii/finleyi-Komplexes (Teleostei, Perciformes), mit der Beschreibungeiner neuen Gattung und dreier neuer Arten. Verhandlungen der Gesellschaft für Ichthyologie, 2, 11–47.
    Lamboj, A. (2005) Nanochromis sabinae, a new cichlid species (Teleostei, Cichlidae) from the Upper Congo River area and northeast Gabon. Zootaxa, 827, 1–11. https://doi.org/10.11646/zootaxa.827.1.1
    Lamboj, A. (2009) A new dwarf cichlid genus and species (Teleostei, Cichlidae) from Guinea, West Africa. Zootaxa, 2173, 41–48. https://doi.org/10.11646/zootaxa.2173.1.4
    Lamboj, A. (2012) A new species of the genus Congochromis (Cichlidae) from the Central Congo Basin. Cybium, 36 (2), 349–3.
    Lamboj, A. & Schelly, R. (2006) Nanochromis teugelsi, a new cichlid species (Teleostei: Cichlidae) from the Kasai Region and central Congo basin. Ichthyological Exploration of Freshwaters, 17 (3), 247–254.
    Lamboj, A., Trummer, F. & Metscher, B. (2016) Wallaceochromis gen. nov, a new chromidotilapiine cichlid genus (Pisces: Perciformes) from West Africa. Zootaxa, 4144 (1), 124–130. https://doi.org/10.11646/zootaxa.4144.1.8
    Paulo, I. (1979) Eine neue Chromodotilapia-Art aus dem Bosumbwe-See/Ghana: Chromidotilapia bosumtwensis sp. n. (Pisces, Perciformes, Cichlidae). Deutsche Cichliden Gesellschaft-Info, 10, 167–174.
    Pellegrin, J. (1904) Etude des poisons de la famille des cichlidés. Mémoires de la Société Zoologique de France, 16, 273–271.
    Pellegrin, J. (1919) Sur un Cichlidé nouveau de l’Ogôoué appartenant au genre Pelmatochromis. Bulletin de la Société Zoologique de France, 44, 102–105.
    Sauvage, H. (1882) Notice sur les poisons du territoire d’Assinie (Côte d’or) (Mission scientifique de M. chaper). Bulletin Societe zoologique de France, 7, 313–325.
    Schliewen, U. & Stiassny, M. (2006) A new species of Nanochromis (Teleostei: Cichlidae) from Lake Mai Ndombe, central Congo Basin, Democratic Republic of Congo. Zootaxa, 1169, 33–46. https://doi.org/10.11646/zootaxa.1169.1.2
    Schliewen, U. & Stiassny, M. (2003) Etia nguti, a new genus and species of cichlid fish from the River Mamfue, Upper Cross River basin in Cameroon. West-Central Africa. Ichthyological Exploration of Freshwaters, 14, 61–71.
    Schwarzer, J., Lamboj, A., Langen, K., Misof, B. & Schliewen, U. (2015) Phylogeny and age of chromidotilapiine cichlids (Teleostei: Cichlidae). Hydrobiologia, 748, 185–199. https://doi.org/10.1007/s10750-014-1918-1
    Seehausen, O. (2015) Process and pattern in cichlid radiations – inferences for understanding unusually high rates of evolutionary diversification. New Phytologist, 207, 304–312. https://doi.org/10.1111/nph.13450
    Seehausen, O. (2006) African cichlid fish: a model system in adaptive radiation research. Proceedings of the Royal Society B, 273, 1987–1998. https://doi.org/10.1098/rspb.2006.3539
    Staeck, W. (1980) Chromidotilapia linkei n. sp. aus dem Mungo River, Kamerun (Pisces: Cichlidae). Senckenbergiana biologica, 60(3/4), 153–157.
    Stauffer, J., Jr., Geerts, M., Konings, A. , McKaye K. & Black, K. (2007) Cichlid fish diversity and speciation. In: Hodkinson T. & Parnell, J. (Eds.). Reconstructing the tree of life: taxonomy and systematics of species rich taxa. CRC Press, Boca Raton, pp. 213–225. https://doi.org/10.1201/9781420009538
    Stiassny, M. & Alter, S. (2015) Phylogenetics of Teleogramma, a riverine clade of African cichlid fishes, with a description of the deepwater molluskivore--Teleogramma obamaorum--from the lower reaches of the middle Congo River. American Museum Novitates, 3831, 1–18. https://doi.org/10.1206/3831.1
    Stiassny, M. & Schliewen, U. (2007) Congochromis, a new cichlid genus (Teleostei: Cichlidae) from central Africa, with the description of a new species from the upper Congo River, Democratic Republic of Congo. American Museum Novitates, 3576, 1–14. https://doi.org/10.1206/0003-0082(2007)3576[1:CANCGT]2.0.CO;2
    Thys van den Audenaerde, D. (1968) A preliminary contribution to a systematic revision of the genus Pelmatochromis Hubrecht sensu lato (Pisces, Cichlidae). Revue de Zoologie et de Botanique Africaines, 77, 349–391.


  2. Thys van den Audenaerde, D. & Loiselle, P. (1971) Description of two new small African cichlids. Revue de Zoologie et de Botanique Africaines, 83 (3-4), 193–206.
    Trewavas, E. (1962) Fishes of the crater lakes of the northwestern Cameroon. Bonner Zoologische Beiträge, 13, 146–192.
    Van der Laan, R., Eschmeyer, W. & Fricke, R. (2021) (Ed.), Catalogue of Fishes: Genera, Species, References. http: // research. calacademy. org/ research/ichthyology /catalog /fishcatmain. asp. (accessed 30 June 2021)

  3.