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Lophiosilurus alexandri: MZUEL , 3, to mm SL, Estação de Piscicultura de Três Marias, CODEVASF, on the upper São Francisco. The “pacamã”, Lophiosilurus alexandri, is a particularly interesting case for addressing this problem. Lophiosilurus alexandri is the largest.

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On day 17 Fig 3a, 3b and 3chead longer than wide. Anal-fin base becoming longer than adipose-fin base. Mentonian and maxillary barbels larger than in flexion-stage specimens. Abstract Pseudopimelodidae are Neotropical catfishes characterized by having slightly to strongly depressed body in fully developed specimens.

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Description and ecology of some early life stages of fishes in the river Sinnamary French Guiana, South America. INPA3, Dorsal fin well developed with short, thick, strong anterior spine and six soft rays. Early life history stages of fishes and their characters Ontogeny and Systematics of Fishes.

Early development stages of the catfish Lophiosilurus alexandri Steindachner, Pisces: Therefore, the relative depth of the body is a phylogenetic character with at least two states perhaps more, if a lophiosilurrus accurate morphometric analysis is performeda relatively deep body being plesiomorphic and a relatively depressed body being apomorphic. Morphology of the gas bladder in bumblebee catfishes Siluriformes, Pseudopimelodidae.

Lophiosilurus alexandri – Wikipedia

Anal fin fully formed, last ray separated from ventral finfold. Dorsal fin well developed, positioned distinctly in front of middle of body.

These dark chromatophores, although already present in yolk sac larvae, are only abundant in postflexion larvae, juveniles and adults. The lateral-line system is well developed in adults of Lophiosilurusdistributed over the head and as a midlateral canal over the body from head to caudal-fin base. However, some species of the family have an incomplete lateral line wherein the lateral-line canal does not reach the caudal-fin base. Eyes small relative to head Table 1.


Initially the dorsalmost rays of the caudal-fin lophiosilurys lobe are longest than the other rays. The only exceptions are Pseudopimelodus and Cruciglaniswhich have serrations much larger on lopphiosilurus posterior face of the spine. The caudal fin is responsible for swimming in most fishes [ 29 ], and the upper lobe is distinctly wider than the lower lobe in species that are typically benthic and need fast bottom-up movements [ 303132 ].

Open lophkosilurus a separate lophiosilurys.

Lophiosilurus alexandri

The funders had no role in study design, data collection and analysis, alezandri to publish, or preparation of the manuscript. At the end of postflexion 42 days; Fig 4a, 4b and 4chead width increases, equals length. Symp Zool Soc Lond. Pelvic fin with 6 rays, third and fourth rays branched in specimens of 52 days or older, fifth and sixth rays branched in specimens of 49 days or older.

In the early stage of postflexion, head deep, with rounded shape in lateral view; depression of head and body starting on day Lateral view of larvae of Lophiosilurus alexandri: Notochord visible by transparency with flexion in caudal region. Multiple illustrations were made for stages that exhibited sudden changes in morphology.

Received Aug 7; Accepted Mar 8. Inner mentonian barbel exceeds posterior margin of eye in early stage of postflexion. Dorsal fin remains positioned anterior to middle of body, distant from head by about half lophiosilruus head length. Adipose fin completely separate from dorsal fin, but with small tissue connection to caudal fin.

This monotypic genus also exhibits the most highly modified morphology for the family. A total of specimens were analyzed, including larvae from hatching to 42 days of development 24 yolk sac, 3 flexion and postflexion larvae and 20 juveniles 49 to 60 days Table 1.

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Adipose-fin base elongate in specimens at 49, 52 and 56 days post-hatching. Gill opening and nostrils formed. Box plot of standard length by age in days x-axis of Lophiosilurus alexandri. Longest stage of larval development with a variety of morphological changes. Tip of outer mentonian barbel surpassing tip of maxillary barbel.


Besides these restrictions, Wayne [ 5 ] noted that the morphological diversity of adult forms of dogs and other domesticated animals depends on expressions during ontogeny. Generelle Morphologie der Organismen: In fully developed specimens of Lophiosilurusthe body is extremely wide and depressed [ 26 ], a condition that is unique among pseudopimelodids and therefore autapomorphic.

Lundberg J, Baskin J. Engield, New Hampshire, U. The search for the morphological changes that gave rise to the present diversity of forms and taxa continues to be one of the main lophiosilirus of Evolutionary Biology.

Primordial fin finfold well developed, hyaline, circling the body from the post-cephalic region to the post yolk sac region. In studies with Hoplias malabaricus and Pyrrhulina australisrespectively, Bialetzki et al. The skin of fully developed specimens of Lophiosilurus possesses many finger-like papillae which aoexandri to develop as wart-like appendages in the postflexion larvae. Caudal, pectoral and pelvic fins largely hyaline, with sparse dark chromatophores Fig 5a.

The analysis presented herein shows that the study of the development of Lophiosilurus alexandri ,ophiosilurus to determine the limits and polarity of the character states related to the evolution alexabdri the Pseudopimelodidae, especially for sister taxa relationships, such as those of Batrachoglanis and MicroglanisLophiosilurus and Cephalosilurusand Cruciglanis and Pseudopimelodusconditions observed in larval and juvenile stages of L.

Head and body slightly pigmented with dendritic chromatophores containing dark pigment.

Nevertheless, Cephalosilurus apurensis also has some papillae on the skin, indicating that it might be possibly closely related to Lophiosiluruscorroborating all three hypothesis of evolution of Pseudopimelodidae [ 91110 ].