Chromosome Studies in Hypoptopomatinae (Pisces, siluriformes, Loricariidae): I. XX/XY Sex Chromosome Heteromorphism in Pseudotocinclus tietensis.

Rare sex chromosome aneuploidies: 49,XXXXY and 48,XXXY syndromes.

49,XXXXY and 48,XXXY syndromes are rare gonosomal aneuploidies in which the affected individuals present with characteristic facial and skeletal malformations, intrauterine growth retardation, and psychomotor retardation. Psychological, endocrinologic and orthopedic disorders constitute the major problems in the clinical follow-up. Sex chromosome abnormalities should especially be kept in mind ...

Karyotype and Sex-Chromosome Polymorphism in Nesokia indica, from Iran

Cascudinhos from Southern Brazil: Systematics, Endemism, and Relationships (Siluriformes, Loricariidae, Hypoptopomatinae)

Epactionotus, a new genus of the loricariid catfish subfamily Hypoptopomatinae with three new species, and a new species of Eurycheilichthys are described from southern Brazil. Epactionotus is diagnosed among genera of the Hypoptopomatinae by the posterior position of the dorsal fin and morphology of its internal supports and by absence of an expanded fleshy flap on the dorsal surface of the fi...

Microlepidogaster discus, a new species of Hypoptopomatinae (Siluriformes: Loricariidae) from the rio Jequitinhonha basin, southeastern Brazil.

A new Hypoptopomatinae is described from the upper rio Jequitinhonha basin. The new species is distinguished from all congeners by having the ventral laminar expansions of cleithrum and coracoid bearing only 1-30 odontodes, restricted to the area near the pectoral-fin insertion; the anterior plates of mid-ventral lateral series reduced, not ventrally elongated, the first or the second markedly ...

I-38: Chromosome Instability in The Cleavage Stage Embryo

Recently, we demonstrated chromosome instability (CIN) in human cleavage stage embryogenesis following in vitro fertilization (IVF). CIN not necessarily undermines normal human development (i.e. when remaining normal diploid blastomeres develop the embryo proper), however it can spark a spectrum of conditions, including loss of conception, genetic disease and genetic variation development. To s...