Florometra magellanica (Bell, 1882) (Echinodermata: Crinoidea) is reported for the first time from Peru. The species was collected in the continental slope (360 – 814 m) off Piura Department, Northern Peru (3°38.67’S, 81° 2.73’W). Reference material has been deposited in the Colección Cientifica del Instituto del mar del Perú (IMARPE), Lima, Peru and in the Colección Nacional de Equinodermos, Universidad Nacional Autonoma de Mexico, Mexico City.

Genetic structure of the populations of H. inornata was evaluated and the barriers for genetic flux and historic processes were investigated. Samples were collected trying to cover the distribution range of the species, from Mexico to northern Perú. Based on COI sequences, 118 haplotypes from 220 specimens were detected; the differences between such haplotypes were due to 97 variable sites (21.41%) of the 453 bp sequenced. A high haplotype diversity (h=0.979) and a moderate nucleotidic diversity were observed. The values of Fst, the exact test of population differentiation, and the molecular variance analysis (AMOVA) were used in order to analyze the genetic differentiation. These analyses suggest the existence of two populations: northern, off the coasts of Sinaloa, Jalisco, Michoacán, Guerrero, and Oaxaca, and southern, off the coasts of Chiapas, El Salvador, Panamá and Perú. Histo...

Se registra por primera vez para el Perú al Crinoideo (Echinodermata) Florometra magellanica (Bell, 1882). La especie fue recolectada en el talud continental (360 – 814 m) frente al departamento de Piura al norte del Perú (3°38,67’S, 81° 2,73’W). El material de referencia se encuentra depositado en la Colección Científica del Instituto del mar del Perú (IMARPE), Lima, Perú y en la Colección Nacional de Equinodermos de la Universidad Nacional Autónoma de México, Ciudad de México.

Genetic structure of the populations of H. inornata was evaluated and the barriers for genetic flux and historic processes were investigated. Samples were collected trying to cover the distribution range of the species, from Mexico to northern Perú. Based on COI sequences, 118 haplotypes from 220 specimens were detected; the differences between such haplotypes were due to 97 variable sites (21.41%) of the 453 bp sequenced. A high haplotype diversity (h=0.979) and a moderate nucleotidic diversity were observed. The values of Fst, the exact test of population differentiation, and the molecular variance analysis (AMOVA) were used in order to analyze the genetic differentiation. These analyses suggest the existence of two populations: northern, off the coasts of Sinaloa, Jalisco, Michoacán, Guerrero, and Oaxaca, and southern, off the coasts of Chiapas, El Salvador, Panamá and Perú. Histo...

Al Consejo Nacional de Ciencia y Tecnología (CONCYTEC), por su apoyo económico para mi estadía en México, y al Consejo Superior de Investigaciones (CSI), de la Universidad Nacional Mayor de San Marcos por el apoyo económico brindado.

Se presentan 22 especies de holoturoideos habitantes del mar del Perú, distribuidas sistemáticamente en tres órdenes, ocho familias y trece géneros. Se incluye el catálogo para cada especie: morfología externa, microscopía electrónica de barrido (MEB) de los osículos y mapa de distribución; así como información sobre la distribución batimétrica y localidad tipo, entre otros aspectos; además una clave de identificación taxonómica para las especies del mar del Perú. Los ámbitos de distribución batimétrica varían de 0 a 1,412 m. Se aportan ocho nuevos registros para el mar del Perú: Pentamera chierchia, Neocucumis veleronis, Holothuria (Cystipus) inhabilis, Holothuria (Selenkothuria) lubrica, Holothuria (Semperothuria) imitans, Holothuria (Vaneyothuria) zacae, Molpadia intermedia y Caudina californica. Se amplía el ámbito de distribución geográfica, a su límite m...