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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The maxillary barbel is also short in all other species of Pseudopimelodidae. Changes in body shape, position of mouth and eyes, and fin morphology were observed during the development of Lophiosilurus alexandri.

Anal fin fully formed, last ray separated from ventral slexandri. Arratia G, Schultze H-P. Nostril, gill opening and axillary gland not formed. Primordial fin further reduced by day 42, but still confluent with caudal fin. The analysis presented herein shows that the study of the development of Lophiosilurus alexandri helps to determine the limits and polarity of the character states related to the evolution of the Pseudopimelodidae, especially for sister apexandri relationships, such as those of Batrachoglanis and MicroglanisLophiosilurus and Cephalosilurusand Cruciglanis and Pseudopimelodusconditions observed in larval and juvenile stages of L.

Description and lophiosilufus of some early life stages of fishes in the river Sinnamary French Guiana, South America. Initially the dorsalmost rays of the caudal-fin upper lobe are longest than the other rays. In the early stage of postflexion, dark dendritic chromatophores more concentrated on head, dorsal and ventral regions of trunk from nuchal region to tail, and dorsal region of yolk sac Fig 2a and 2b. Conceived and designed the alexanri The authors have declared that no competing interests exist.


Incipient caudal fin wing shaped, visible within confluent portions of dorsal and ventral finfolds; hypurals forming as cartilage. Data Availability All relevant data are within the paper.

Structure and function in the catfish. Intestine small, not reaching the middle region of body; anus closed. Body proportions that increase from post-larval to juvenile stages are: Head deep, longer than wide, rounded shape in lateral view. 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 the dorsal-fin base in day old specimens.

Notochord visible by transparency with flexion in caudal region. The presence of an incomplete lateral line on the body is most likely due to a paedomorphic event, and is a putative synapomorphy for a clade composed of Batrochoglanis and Microglaniscorroborating previous hypotheses [ 911 ].

Early life history stages of fishes and their characters Ontogeny and Systematics of Fishes. Universidade Federal Rural de Pernambuco. Placement of the eyes on the dorsal surface of the head is a condition unique to juvenile and adult Lophiosilurusand therefore an autapomorphy of the species.


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Open in a separate window. In fully developed specimens of Lophiosilurusthe body is extremely wide and depressed [ 26 ], a condition that is unique among pseudopimelodids and therefore autapomorphic. National Center for Biotechnology InformationU. Lophiosiluruz, New Hampshire, U. Stage absent in L. Twenty-three measurements were obtained on juveniles using a digital caliper accurate to 0.

Lophiosilurus alexandri – Wikiwand

Desenvolvimento inicial de Hoplias. Mouth large, with prognathic position Fig 5a similar to adult specimens Fig 6a and 6b.

The highest value in Fig 8 was lophuosilurus by an adult specimen of Lophiosilurus alexandridue to its distinctly depressed body, more depressed than any other species of Pseudopimedidae.

Anal-fin base shorter than adipose-fin base.

Caudal fin with 20 dorsal procurrent rays, 13 principal rays, and 18 ventral procurrent rays. However, as larvae of Lophiosilurus are benthic and lohiosilurus by the male in excavated nests [ 4012 ], the change of coloration that takes place in the postflexion stage can be possibly coincident with the onset of parental care.