FIGURE 4 - uploaded by Melanie L. J. Stiassny
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Holotype of Parananochromis brevirostris; AMNH 230720, male, 42.5 mm SL; Gabon: Ivindo River system, Small creek ca. 200m downstream of IRET station.
Source publication
Parananochromis axelrodi , P. brevirostris and P. ornatus, three new cichlid species, are described from Gabon and southern Cameroon. Parananochromis axelrodiis a deep-bodied species differing from congeners in a combination of morphometric and meristic characters. Parananochromis brevi- rostris and P. ornatus are distinguished by the presence of f...
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Citations
... They can tolerate a wide range of water quality parameters through anatomical, behavioural, and physiological adaptations. Feeding versatility allows exploitation of diverse food sources like phytoplankton, plants, insects, worms, and periphyton (Getabu et al., 2003, andLamboj et al., 2003). As maternal mouth brooders, female Nile tilapia incubate fertilised eggs up to hatching, releasing fully formed fry, enabling high reproductive success and invasive potential (Canonico et al., 2005). ...
The growth patterns, sex ratio, and condition factor of Oreochromis niloticus species from Choba, Ogbogoro, and Iwofe landing sites along the New Calabar River, Rivers State, Nigeria, were investigated. Fish samples were collected with the aid of fishermen using various fishing gears for a period of six months (June to November 2024). 283 Oreochromis niloticus species were examined, with the total length (TL) and weight (W) ranging from 9.81 to 14.37 cm and 22.58 to52.49 grams, respectively. The overall sex ratio recorded 46% male and 54% female out of a total sample of 248 fish. The length-weight relationships value for the b exponent ranged from 2.69 to 2.96, while the growth pattern exhibited a negative allometry across the sampled months and exhibited a very strong relationship (r 2 = 0.88-0.99). The condition factor values ranged from 0.9 to 3.04 and 1.3 to 2.91 for males and females, respectively. Thus, the current study offered valuable information on the Oreochromis niloticus species, which will be useful to scientists and fisheries conservationists who are interested in this type of fish sourced from the New Calabar River.
... Most members of the lacustrine species flocks are representatives haplotilapiine lineages (Schwarzer et al., 2009;Dunz & Schliewen, 2013), whereas the remaining, mostly riverine, African cichlids can be grouped into five major lineages, i. e. Chromidotilapiini, Hemichromini, Heterochromini, Pelmatochromini, and Tylochromini (Schwarzer et al., 2009;Dunz & Schliewen, 2013;Schwarzer et al., 2015). Parananochromis Greenwood, 1987, a member of the Chromidotilapiini, is distinguished from other chromidotilapiine genera by a unique combination of characters: outer and inner-row teeth in oral jaws unicuspid; a well-developed, visor-like, hanging pharyngeal pad; absence of microbranchiospines along the outer faces of the second, third, or fourth gill arches; 12 circumpeduncular scale rows; four laterosensory openings in the lachrymal bone, and 3-4 tubular infraorbital bones (Lamboj & Stiassny, 2003;. ...
... As currently recognised, Parananochromis comprises eight valid species: Parananochromis axelrodi Lamboj & Stiassny, 2003, P. brevirostris Lamboj & Stiassny, 2003, P. caudifasciatus (Boulenger, 1913), P. elobatus Lamboj, 2014, P. gabonicus (Trewavas, 1975, P. longirostris (Boulenger, 1903), P. ornatus Stiassny, 2003, andP. orsorum Lamboj, 2014. ...
... As currently recognised, Parananochromis comprises eight valid species: Parananochromis axelrodi Lamboj & Stiassny, 2003, P. brevirostris Lamboj & Stiassny, 2003, P. caudifasciatus (Boulenger, 1913), P. elobatus Lamboj, 2014, P. gabonicus (Trewavas, 1975, P. longirostris (Boulenger, 1903), P. ornatus Stiassny, 2003, andP. orsorum Lamboj, 2014. ...
Parananochromis moutingae, new species, is the first species of Parananochromis to be recorded as endemic to the Congo Basin. It is recorded from the Lefini, Lebomo, and Mayi Ndombe Rivers in the middle Congo. Paranano- chromis moutingae is distinguished from all congeners by a unique combination of the following meristic and morphological characters: three tubular infraorbital bones; a well-developed hanging pad on the pharynx roof; more scales between the dorsal-fin origin and the upper lateral line (5.5-6.5); more small scales between pectoral and pelvic fin insertions (8-10); presence of scales on the chest; more gill rakers on the lower limb of the first gill arch (8-9); more teeth (5-7) on pharyngobranchial 2 of upper pharyngeal jaw; longer snout (32-39 % HL); longer predorsal distance (33.9-36.1 % SL); broader than long lower pharyngeal jaw; straight urohyal spine; and slightly indented ventral margin of the lower pharyngeal keel. Despite concerted efforts, the species has not been collected in the Lefini River since its original discovery in 2008, probably as a result of the installation of a hydroelectric dam, but it seems to subsist in the other two locations.
Parananochromis moutingae, nouvelle espèce, est la première du genre qui soit endémique du bassin du Congo. L’espèce est présente dans les rivières Lefini, Lebomo et Mayi-Ndombe dans le Moyen Congo. Parananochromis moutingae se distingue de tous ses congénères par la combinaison unique des caractères méristiques et morphomé- triques suivants : trois infra-orbitaires tubulaire; un coussinet papilleux bien développé de chaque côté du pharynx; nombre élevé d’écailles entre la première ligne latérale et l’origine de la nageoire dorsal (5,5-6,5) ; nombre élevé des petites écailles entre la nageoire pectorale et le point d’insertion de la nageoire ventrale (8-10); la présence d’écailles sur la poitrine; grand nombre de branchiospines sur la partie inférieure du première arc branchial (8-9); nombre élevé de dents (5-7) sur les parties antérieures de l’os pharyngé supérieur; long museau (32-39% Ltête); grande distance prédorsale (33,9-36,1 % LS); l’os pharyngé inférieur plus large que long; pointe de l’urohyal droite; et la marge ventrale de l’os pharyngé inférieur légèrement échancrée. Malgré les efforts de collecte, l’espèce n’a plus été retrouvée récemment dans la rivière Lefini depuis sa récolte en 2008, probablement suite à l’installation d’un barrage hydroélectrique sur la rivière Lefini, mais elle semble subsister encore dans les deux autres localités.
... The revised identification here as P. elobatus means that P. breviros tris is restricted to the Ivindo and Ogowe drainages (cf. Lamboj & Stiassny, 2003). Description. ...
Parananochromis elobatus, new species, is an elongate species distinguished from congeners by the combination of: three tubular infraorbital bones, scales absent from the chest, a weakly developed pharyngeal pad, and short dorsal fin lappets. Parananochromis orsorum, new species, is diagnosed by the presence of four tubular infraorbitals, pelvic fin with black tips in females, and absence of silvery dots on body scales of males.
... After investigation of additional material, he indicated a further subdivision of Nanochromis and Pelvicachromis into two genera. After Greenwood's study, numerous descriptions of novel species and genera were published (Lamboj, 1999(Lamboj, , 2001(Lamboj, , 2002(Lamboj, , 2003(Lamboj, , 2004a(Lamboj, , 2005(Lamboj, , 2009(Lamboj, , 2012(Lamboj, , 2013Lamboj & Snoeks, 2000;Lamboj & Stiassny, 2003;Lamboj & Schelly, 2006), but no phylogenetic studies have been presented that would account for the drastically increased richness of the most speciose group of West-Central African cichlids. Today, chromidotilapiine species richness comprises 10 genera with 48 described and at least 10 undescribed species (Eschmeyer, 2014, AL & UKS, unpubl. ...
... E. Vreven and M. Stiassny). Previously, Parananochromis was considered to be restricted to the inland portion of northeastern Lower Guinea (Lamboj & Stiassny, 2003;. Node age estimates for the basal divergences across the extant western margin of the Congo basin, i.e., the two major Parananochromis splits from the Congo basin and Lower Guinea, respectively, as well as the divergence estimate for the Ghanaian Limbochromis and the Congolian taxa, indicate that lineages diverged at approximately the same period in the Oligocene/ Miocene (nodes PARA1 and LIMB, Fig. 4, Table 1). ...
Chromidotilapiine cichlid fishes (Teleostei:
Cichlidae) of West and Central Africa represent the
most species rich ancient African cichlid lineage. In
contrast to the mega-diverse haplotilapiine cichlids
from the African rift valley and crater lakes, very little is
known about their phylogenetic history. Based on
mitochondrial and nuclear DNA sequences and a
representative taxon sampling, we present a first
molecular phylogenetic hypothesis and propose age
estimates for their origin and diversification. Our data
support themonophyly and anOligocene/Eocene origin
of chromidotilapiines. Within chromidotilapiines, two
large, reciprocally monophyletic clades are present and
the enigmatic genus Teleogramma could be phylogenetically
placed for the first time. The two distantly
distributed species Limbochromis robertsi and Chromidotilapia
schoutedeni were identified as sister group to
the Congolian species complexes of Nanochromis and
Congochromis. This unexpected phylogenetic link
between a region in West Africa and the Congo basin
suggests an ancient hydrogeographic corridor spanning
almost half of the African continent. The nearly
complete taxon sampling, good knowledge on species
distribution patterns and well resolved phylogenies
allow the presumption that paleogeographic patterns
rather than ecological factors shaped the ancient divergence
within chromidotilapiines, which predates the
origin of the mega-diverse austrotilapiine lineage,
comprising the majority of African cichlid species.
