Diagnostic Description
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Body compressed, moderately elongate. Mouth terminal. Overall coloration silvery-tan, with silvery highlights on scales, major portion of iris, infraorbitals, preopercle, and opercle. Dorsal portion of iris, together with lateroventral half of head, with the exception of third infraorbital, and ventral portion of preopercle and opercle tinged with yellow. Scales around humeral spot and on lateroventral region of body anterior to anal fin origin also yellowish. Humeral spot visible, although not so conspicuous as in preserved specimens. Concentration of dark chromatophores visible over caudal peduncle, although not forming conspicuous blotch. Dorsal, anal, caudal, and adipose fins reddish-orange. Pectorals yellowish and pelvic fins hyaline.Astyanax jacobinae can be distinguished from most of its congeners and from all other Astyanax species known from northeastern Brazilian drainages (A. brevirhinus, A. fasciatus, A. intermedius, A. lacustris, A. pelecus, A. rivularis, A. taeniatus) by the presence of a vertically elongated humeral blotch (vs. distinctly horizontally elongated humeral blotch in A. lacustris and A. pelecus), absence of a conspicuous dark stripe from humeral region to caudal peduncle (vs. well defined dark midlateral stripe along most of body length in A. intermedius, A. pelecus, A rivularis, A. taeniatus), three or four outer premaxillary teeth, three maxillary teeth, and 21â26 anal fin rays (vs. five outer premaxillary teeth, one or two maxillary teeth, and 28 anal-fin rays in A. brevirhinus). The new species differs from the majority of Astyanax species by its larger eye diameter (36.8â40.3% vs. 24.7â35.4%, with the exception of A. intermedius among northeastern species that approaches the eye diameter of A. jacobinae with 29.0â36.4%). It can be distinguished from A. turmalinensis by its higher number of maxillary teeth and by the presence of only one humeral blotch (3 or 4 teeth vs. 1 or 2 and presence of two humeral blotches). It can be also distinguished from A. epiagos by having higher number of branched anal-fin rays (19â22 vs. 13â17), three maxillary teeth (vs. 0â2), longer anal-fin base length (27.6â30.7% vs. 18.1â23.2%), shorter distance from eye to dorsal-fin origin (36.0â39.2% vs. 39.5â43.2%), and also by the absence of broad space between infraorbitals and preopercle.
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Morphology
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tarjonnut Fishbase
Dorsal spines (total): 2; Dorsal soft rays (total): 9; Anal spines: 4; Analsoft rays: 19 - 22
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Trophic Strategy
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tarjonnut Fishbase
The type-locality of A. jacobinae is a dark headwater stream with mild water current runningover pebbles, rocks and sand. Stream depth in the area sampled varied between 0.3â0.5 m and average width was around 2.0 m. Trees, palm trees, and grasses represented the marginal vegetation. The analysis of the stomach contents of one specimen revealed the presence of two distinct larvae of Diptera(Chironomidae),larvae of Trichoptera, fragments of adults of Diptera and unidentified fragments of arthropods.
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Astyanax jacobinae: Brief Summary
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valencia
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tarjonnut wikipedia CA
Astyanax jacobinae és una espècie de peix de la família dels caràcids i de l'ordre dels caraciformes.
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Astyanax jacobinae: Brief Summary
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kastilia
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tarjonnut wikipedia ES
Astyanax jacobinae es una especie de peces de la familia Characidae en el orden de los Characiformes.
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Astyanax jacobinae
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baski
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tarjonnut wikipedia EU
(RLQ=window.RLQ||[]).push(function(){mw.log.warn("Gadget "ErrefAurrebista" was not loaded. Please migrate it to use ResourceLoader. See u003Chttps://eu.wikipedia.org/wiki/Berezi:Gadgetaku003E.");});
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Astyanax jacobinae: Brief Summary
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baski
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tarjonnut wikipedia EU
Astyanax jacobinae Astyanax generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Characidae familian.
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雅各麗脂鯉
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kiina
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tarjonnut wikipedia 中文维基百科
雅各麗脂鯉: Brief Summary
(
kiina
)
tarjonnut wikipedia 中文维基百科
雅各麗脂鯉，為輻鰭魚綱脂鯉目脂鯉亞目脂鯉科的其中一個種，為熱帶淡水魚，分布於南美洲Jaqueira河流域，體長可達5.1公分，棲息在底中層水域，生活習性不明。
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