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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Early life history stages of fishes and their characters Ontogeny and Systematics of Fishes. These papillae are formed by an accumulation of keratin, and are distinct from the tubercles present in other catfishes [ 34353637 ] by lacking unculiferous cells [ 38 ]. Anal-fin base becoming longer than adipose-fin base.

Changes in body shape, position of mouth and eye, morphology of fins and pigmentation were observed during the development of Lophiosilurus. Mouth not formed soon after hatching; visible in subterminal position after the first day of development. The skin of fully developed specimens of Lophiosilurus possesses many finger-like papillae which begin to develop as wart-like appendages in the postflexion larvae.

In the first apomorphic state, the upper and lower caudal-fin rays are a,exandri similar in length, and aledandri second apomorphic state, the middle rays of the upper caudal-fin lobe become elongated. Cruciglanis pacifici has the highest proportion of body depth indicating lophiosiluruw relatively deep body, and Microglanis parahybae and M. Maxillary barbel not reaching gill opening. INPA1, Among adult pseudopimelodids, the putative plesiomorphic state, the subterminal mouth, is present only in Cruciglanis pacifici.

Initially the dorsalmost rays of the caudal-fin upper lobe are longest than the other rays. Desenvolvimento inicial de Hoplias. Relation of relative values of body depth to relative value of body width of larvae and juvenile individuals of Lophiosilurus alexandri diamonds and mean values of other species of Pseudopimelodidae squares.

The change from the first to the second apomorphic state of lophiosolurus character is also observed in developmental series of many species of Auchenipteridae, Heptapteridae, and Pimelodidae [ 1428 ], indicating that this may be a evolutionary change that occurred early in the evolution of catfishes.


At the end of postflexion 42 days; Fig 4a, 4b and 4chead width increases, equals length. Skin of head with small wart-like appendages mainly on supraorbital and ventral regions. Many of these transitional features are seen as distinct terminal conditions in the lolhiosilurus species of Pseudopimelodidae, and have been used as characters in phylogenetic analyses.

Intestine small, not reaching the middle region of body; anus closed. Tip of outer mentonian barbel surpassing tip of maxillary barbel. From hatching to day 2 of development.

Upon hatching, the larvae remain at the bottom of the nest and do not move vertically into the water column. Therefore, given its large size, unique shape, and controversial phylogenetic position, L. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Generelle Morphologie der Organismen: A phylogenetic analysis of the major groups of catfishes Teleostei: Pectoral fin, when adpressed, reaching vertical through end of dorsal-fin base and slightly surpassing origin of pelvic fin.

Base of dorsal fin with chromatophores concentrated in patches.

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Allgemeine Grundzuge der organischen Formen-Wissenschaft, mechanisch begrundet durch die von Charles Darwin reformite Descendz-Theoria, 2 vols. However, as specimens grow, the dorsalmost rays of the upper lobe become relatively shorter, and the middle rays of the upper lobe are relatively longer, including the adults.

The Biogenetic law, proposed by Haeckel [ 2 ] and reformulated by Nelson [ 1 ], says that the steps of an ontogenetic series can be directly translated into an ordered series lophhiosilurus character states.

Similar papillae are absent in most species of the family. At 42 days, hooks on anterior and posterior margins of pectoral-fin spine similar in size Fig 5c.

In Lophiosilurusaldxandri gland starts to develop in flexion stage larvae as a white tissue cluster immediately above the primary pectoral fin. The highest value in Fig 8 was obtained by an adult specimen of Lophiosilurus alexandridue to its distinctly depressed body, more depressed than any other species of Pseudopimedidae. This is lophiosiluru case in Microglanis and Batrochoglaniswherein the lateral-line canal extends from the head to below the lophiosliurus of the dorsal-fin base [ 9 ], or to the terminus of the adipose-fin base [ 33 ], respectively.


Small gill opening present within the first day. This is an open access article distributed under the terms of the Creative Commons Attribution Licensewhich permits unrestricted use, distribution, and reproduction alxeandri any medium, provided the original author and source are credited.

Axillary pore very difficult to visualize in larval specimens; associated gland visible by transparency of skin. The color pattern of most species of Pseudopimelodidae is formed by dark transverse bars on the body that is somewhat triangular, wide dorsally and tapered ventrally, and dark irregular blotches on the sides of head and body.

Lophiosilurus alexandri – Wikiwand

Changes in body shape, position of mouth and eyes, and fin morphology were observed during the development of Lophiosilurus alexandri. The finger-like papillae probably function as camouflage for specimens of Lophiosilurus as they bury in the sand. Received Aug 7; Accepted Mar 8. The position of the alexandfi has also undergone major changes during the development of Lophiosilurus.

Caudal, pectoral and pelvic fins largely hyaline, with sparse dark chromatophores Fig 5a. However, the lateral-line canal of the body starts to develop in young juveniles from head to rear; the lateral-line canal extends to the vertical through the terminus of alexandrii dorsal-fin base in day old specimens.

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INPA3, Accessed Mar In the phylogeny of Pseudopimelodidae proposed by Shibatta [ 9 ], L. Epidermal breeding tubercles and bony contact organs in fishes. The lateral-line system is well developed in adults of Lophiosilurusdistributed over the head and as lophioxilurus midlateral canal over the body from head to caudal-fin base. Species of most genera of Pseudopimelodidae also present a well-developed lateral line that extends on the body from head to caudal-fin base.