Results 141 to 150 of about 1,671 (171)

Weighted parsimony phylogeny of the family Characidae (Teleostei: Characiformes)

Cladistics, 2009
AbstractThe family Characidae, including more than 1000 species, lacks a phylogenetic diagnosis, with many of its genera currently considered as incertae sedis. The aims of the present study are to propose a phylogenetic diagnosis and to assess higher‐level relationships of and within Characidae. In this regard, 360 morphological characters are studied
J Marcos Mirande
exaly   +4 more sources

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Monophyly of the Agoniatinae (Characiformes: Characidae)

Zootaxa, 2013
The Characidae is the most diverse family of Neotropical fishes, currently encompassing more than one thousand valid spe-cies. Some subgroups within this family still lack phylogenetic definitions, being diagnosed on the basis of combination of characters, a common procedure in pre-cladistic studies. Agoniatinae, currently composed by two valid species,
Dagosta, Fernando C.P., Datovo, Aléssio
openaire   +2 more sources

Observations on tooth replacement in piranhas (Characidae)

Archives of Oral Biology, 1975
Abstract Skeletal and preserved material from 15 piranha fish ( Characidae ) were examined radiographically and the heads of a further three specimens of body length 2.5–4.0 cm examined histologically. Such material revealed a close correlation in the stage of development between upper and lower dentitions on the same side of the jaws but the stage ...
openaire   +2 more sources

The dynamics of parental care of Copeina arnoldi (pisces, characidae)

Behavioral Biology, 1976
The parental behavior of 10 isolated male Copeina arnoldi with single spawns was monitored throughout the parental cycle. Parental splashing frequency decreased daily after spawning. Daily mean splashing frequencies observed ranged from 38.5 to 0.2 splashes per hour. No diurnal cycle of parental splashing could be discerned. Bouts of parental splashing
Stephen G. Nelson, C. O'Neil Krekorian
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Early development ofBrycon orthotaenia(Pisces: Characidae)

Zygote, 2011
SummaryBrycon orthotaeniais an important fish for commercial and sport fishing and may reach 7 kg in body weight; it is endangered in some regions of Brazil's São Francisco River Basin. Breeders were subjected to spawning induction to analyse the early development; oocytes and semen were obtained by manual extrusion and fertilization was carried out ...
Rafael Zeferino, Gomes, Yoshimi, Sato, Elizete, Rizzo, Nilo, Bazzoli   +3 more
openaire   +2 more sources

Schallerzeugung bei Piranhas (Serrasalminae, Characidae)

Zeitschrift f�r Vergleichende Physiologie, 1971
1. Piranhas (Serrasalmus nattereri Kner, S. rhombeus Linne, S. hollandi Eigenmann, S. striolatus Steindachner, S. elongatus Kner) erzeugen durch einen Schwimmblasenmechanismus mit paarigen externen Trommelmuskeln Schallsignale, wenn man sie festhalt. 2.
openaire   +1 more source

Chromosome characterization in Acestrorhynchinae and Cynopotaminae (Pisces, Characidae)

Journal of Fish Biology, 1985
The karyotypes of six species of Acestrorhynchinae (Acestrorhynchus alus, A. lacustris, Oligosarcus hepsetus, O. jenynsii, O. macrolepis and O. pinloi) and of one species of Cynopotaminae (Galeocharax knerii) were studied. The six Acestrorhynchinae species have 2n= 50, while Galeocharax knerii has 2n= 52 chromosomes.
J. das Neves Falcão, L. A. C. Bertollo
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Fine structure of the drum muscles of the piranha (serrasalminae, characidae)

Cell and Tissue Research, 1977
The anterior and the posterior drum muscles of the piranha resemble each other in all essential fine structural aspects: myofibrils are slender; sarcomeres are short compared with those of other drum muscles; mitochondria, located in the periphery of the fibers, are numerous and show an irregular internal structure; and the sarcoplasmic reticulum is ...
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Intromittent Organ in the Genus Monotocheirodon (Characiformes: Characidae)

Copeia, 2006
Abstract We herein document intromittent organs in four Peruvian populations of inseminating fishes of the family Characidae, genus Monotocheirodon, which may comprise new species. All females histologically analyzed from these populations, as well as a female of Monotocheirodon pearsoni, had spermatozoa within the ovary, confirming insemination.
John R. Burns, Stanley H. Weitzman
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A phylogeny of Astyanax (Characiformes: Characidae) in Central and North America

Zootaxa, 2016
A phylogeny is presented for 34 species of Astyanax, 27 of them once included within A. aeneus or A. fasciatus in Central America and Mexico, based on 52 morphological characters (mostly osteological, but also pigmentation and meristics), with three outgroups. Monophyly is not supported for A. aeneus s. lat., as Brazilian species such as A. fasciatus s.
openaire   +2 more sources