Classification / Names
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Cichliformes (Cichlids, convict blennies) >
Cichlidae (Cichlids) > Pseudocrenilabrinae
Etymology: Maylandia: In honour of Hans J. Mayland, German ictiologist (Ref. 45335); usisyae: The specific epithet usisyae is the genitive of Usisya, the village near which the type specimens were collected (Ref. 119465).
Environment: milieu / climate zone / depth range / distribution range
Ecologia
; acqua dolce benthopelagico. Tropical
Africa: Lake Malawi in Malawi (Ref. 119465).
Size / Peso / Age
Maturity: Lm ? range ? - ? cm
Max length : 7.5 cm SL maschio/sesso non determinato; (Ref. 119465)
Short description
Morfologia | Morfometria
Spine dorsali (totale): 17 - 18; Raggi dorsali molli (totale): 8-9; Spine anali 3; Raggi anali molli: 7 - 8. Diagnosis: The presence of bicuspid teeth in the outer rows on both the upper and lower jaws and a moderately sloped vomer block with a swollen rostral tip place this species in Maylandia (Ref. 119465). Male and female M. usisyae are distinguished by an elongate body, body depth 25.9-30.6% of standard length, from all other species in Maylandia, body depth 28.8-40.8% of standard length, except M. tarakiki, body depth 25.8-32.9% of standard length, and M. flavicauda, body depth 23.6-28.5% of standard length (Ref. 119465). It differs from M. tarakiki by a smaller eye, vertical eye diameter 23.1-28.1% of head length vs. 30.2-36.5% in M. tarakiki; and a shorter lower jaw length, lower jaw length 29.9-33.4% of head length vs. 34.8-38.9% on M. tarakiki (Ref. 119465). Based on the colour pattern, male M. usisyae possess a yellow dorsal fin with a black submarginal band, yellow pelvic fins and yellow anal fin with a black leading edge; male M. flavicauda possess black pelvic and anal fins, and a black dorsal fin with yellow/orange spots distally; the ground colouration of male M. flavicauda is blue with 2 light/purple interorbital bars vs. yellow with 2 white/light blue interorbital bars in male M. usisyae; females of M. usisyae cannot reliably be distinguished by colour from those of M. flavicauda; Maylandia flavicauda also possess a deeper preorbital bone, preorbital depth 18.0-26.9% of head length, and a longer snout, snout length 34.3-47.3% of head length, which are 17.6-21.2% and 32.0-37.6% in M. usisyae respectively (Ref. 119465).
Life cycle and mating behavior
Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve
Li, S., A.F. Konings and J.R. Stauffer Jr., 2016. A revision of the Pseudotropheus elongatus species group (Teleostei: Cichlidae) with description of a new genus and seven new species. Zootaxa 4168(2):353-381. (Ref. 119465)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
Informazioni ulteriori
Nomi ComuniSinonimiMetabolismoPredatoriEcotossicologiaRiproduzioneMaturitàDeposizioneSpawning aggregationFecundityUovaEgg development
Age/SizeAccrescimentoLength-weightLength-lengthLength-frequenciesMorfometriaMorfologiaLarveDinamica popolazioni larvaliReclutamentoAbbondanzaBRUVS
BibliografiaAcquacolturaProfilo di acquacolturaVarietàGeneticaElectrophoresesEreditarietàMalattieElaborazioneNutrientsMass conversion
CollaboratoriImmaginiStamps, Coins Misc.SuoniCiguateraVelocitàModalità di nuotoArea branchialeOtolithsCervelliVista
Strumenti
Special reports
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Trophic level (Ref.
69278): 2.3 ±0.1 se; based on size and trophs of closest relatives
Resilienza (Ref.
120179): Alto, tempo minimo di raddoppiamento della popolazione meno di 15 mesi (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
