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Petromyzontiformes (Lampreys) >
Mordaciidae (Southern topeyed lampreys)
Etymology: Mordacia: Etymology not explained, likely derived from mordax (L.), biting, referring to specific name of M. mordax. (See ETYFish); praecox: Latin for premature, referring to its “precocious nature of sexual development,” wherein newly metamorphosed ammocoetes become sexually mature without first reaching their adult parasitic phase. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
Ecologia
; Água doce demersal; potamódromo (Ref. 51243). Temperate
Oceania: known only from the Moruya and Tuross Rivers in southern New South Wales, Australia.
Tamanho / Peso / Idade
Maturity: Lm ? range ? - ? cm
Max length : 50.0 cm SL macho/indeterminado; (Ref. 44894); common length : 37.5 cm SL macho/indeterminado; (Ref. 44894)
Descrição suscinta
Morfologia | Morfometria
Adults: 10.2-172 mm TL; body proportions, as percentage of TL: 9.4-12.6 prebranchial length, 8.2-9.9 branchial length, 59.6-64.2 trunk length, 16.5-20.4 tail length, 1.3-1.5 eye length and 5.4-8.4 disc length; no gular pouch develops; urogenital papilla not prominent in mature adults; trunk myomeres, 85-93. Adult dentition: 2 triangular supraoral laminae each with 3 unicuspid teeth, 1 per apex (exceptionally, 4 unicuspid teeth per supraoral lamina); Infraoral lamina, 9-10 unicuspid teeth of various size (these teeth become greatly enlarged with sexual maturation); 5-6 endolaterals on each side; endolateral formula, typically 2-2-3-3-4-3 or 2-2-3-3-4-4 in immature individuals and 1-1-1-1-1 or 1-1-1-1-1-1 in mature individuals; 1 row of anterials; first row of anterials, 2 unicuspid teeth flanked on either side by one bicuspid tooth in immature individuals and 4 unicuspid teeth in mature individuals; 1-2 rows of exolaterals on each side; 1 row of posterials; first row of posterials, 16 posterial plates, the three lateralmost tricuspid and the internal ones bicuspid in immature individuals and 13 unicuspid teeth in mature individuals; transverse lingual lamina w-shaped with numerous unicuspid teeth of various size, the middle apex one being intermediate in size and the two bottom apex ones being largest, while the rest are small; longitudinal lingual laminae hook-shaped each with an undetermined number of unicuspid teeth. Body coloration (live) of mature adults with dark blue dorsal surface, occasionally with a green tinge, ventral surface of males mottled gray and ventral surface of females yellowish; extent of caudal fin pigmentation, 25% to <75%; caudal fin shape, spade-like; oral papillae, 33-48 (Ref. 89241).
Inhabits freshwater streams, a non-parasitic lamprey that spends its entire life cycle in freshwater. Ammocoetes burrow in soft substrates, phase lasts about 3 years; metamorphosis usually occurs between October and November. Presumed to migrate upstream around April, and spawns in late winter or spring (Ref. 44894). Fecundity, 326-675
eggs/female (Ref. 89241).
Allen, G.R., 1989. Freshwater fishes of Australia. T.F.H. Publications, Inc., Neptune City, New Jersey. (Ref. 5259)
Status na Lista Vermelha da UICN (Ref. 130435)
Ameaça para os humanos
Harmless
Uso pelos humanos
Pescarias: sem interesse
Mais informação
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Fontes da internet
Estimates based on models
Índice de diversidade filogenética (Ref.
82804): PD
50 = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00102 (0.00046 - 0.00225), b=3.06 (2.88 - 3.24), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Nível Trófico (Ref.
69278): 4.4 ±0.8 se; based on size and trophs of closest relatives
Resiliência (Ref.
120179): Baixo, tempo mínimo de duplicação da população 4,5 - 14 anos (Semelparous species, assuming tm (= tmax) > 4).
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (44 of 100).
