Guillermo Guzmán

NEW RECORDS OF SHRIMPS (DECAPODA: CARIDEA AND DENDROBRANCHIATA) IN DEEP WATERS OFF CHILE

Se revisan las especies de camarones de aguas profundas, a partir de material bibliografico y especimenes recolectados durante la expedicion PUCK 156 (2001) a bordo del B/C Sonne en tres areas de la costa de Chile: Antofagasta (22° lat. S), Concepcion (36° lat. S) y Chiloe (42° lat. S). 111 especimenes correspondientes a 12 especies fueron reconocidos, incluyendo tres nuevos registros para la carcinofauna chilena; Metacrangon procax, Nematocarcinus productus y Merhyppolite sp. aff. M. americana. La presencia de Nematocarcinus lanceopes, Lebbeus antarcticus, Pandalopsis ampla y Sclerocrangon atrox en el material recolectado permite extender sus rangos de distribucion desde areas sub-Antarticas a temperadas de la costa de Chile

THE SUBFAMILY BENTHESICYMINAE BOUVIER, 1908 (DECAPODA, DENDROBRANCHIATA) IN NORTHERN CHILE (18° TO 22°S)

We review the shrimp specimens belonging to the subfamily Benthesicyminae deposited in the reference collections of the Museo del Mar of the Arturo Prat University at Iquique, Chile. Eight species are registered, six of which are new reports for southeastern Pacific waters. Se revisan los ejemplares de la subfamilia Benthesicyminae de la zona norte de Chile y depositados en las colecciones de referencia del Museo del Mar de la Universidad Arturo Prat de Iquique, Chile. Se citan ocho especies, seis de las cuales son nuevos registros para el Pacifico suroriental.

A redescription of Acanthonyx Petiverii H. Milne Edwards, 1834, and designation of a neotype for Acanthonyx Simplex Dana, 1852 (Brachyura, Majidae)

[The identity of the problematic spider crab species, Acanthonyx simplex Dana, 1852, originally described from Hawaii and never reported since, is resolved. It is here shown to be identical to Acanthonyx petiverii H. Milne Edwards, 1834, a species that is widely distributed on both sides of the American continent. The supposed type locality of Acanthonyx simplex is almost certainly wrong. Acanthonyx petiverii , nevertheless, is a highly variable species and, as such, is redescribed in detail. To ensure a stable taxonomy for these species and the genus, a neotype for A. simplex is designated. La problematica identidad de la especie de cangrejo arana Acanthonyx simplex Dana, 1852, originalmente descrita para las costas de Hawai y nunca estudiada desde entonces, ha sido determinada. Aqui se demuestra que es identica a Acanthonyx petiverii Milne Edwards, 1834, especie que se distribuye en ambas costas del continente Americano. La supuesta localidad tipo de Acanthonyx simplex es, casi con certeza, un dato erroneo. Acanthonyx petiverii , no obstante, es una especie altamente variable morfologicamente y, en consecuencia, se redescribe en detalle. Para estabilizar la taxonomia, se designa un neotipo para la especie A. simplex . , The identity of the problematic spider crab species, Acanthonyx simplex Dana, 1852, originally described from Hawaii and never reported since, is resolved. It is here shown to be identical to Acanthonyx petiverii H. Milne Edwards, 1834, a species that is widely distributed on both sides of the American continent. The supposed type locality of Acanthonyx simplex is almost certainly wrong. Acanthonyx petiverii , nevertheless, is a highly variable species and, as such, is redescribed in detail. To ensure a stable taxonomy for these species and the genus, a neotype for A. simplex is designated. La problematica identidad de la especie de cangrejo arana Acanthonyx simplex Dana, 1852, originalmente descrita para las costas de Hawai y nunca estudiada desde entonces, ha sido determinada. Aqui se demuestra que es identica a Acanthonyx petiverii Milne Edwards, 1834, especie que se distribuye en ambas costas del continente Americano. La supuesta localidad tipo de Acanthonyx simplex es, casi con certeza, un dato erroneo. Acanthonyx petiverii , no obstante, es una especie altamente variable morfologicamente y, en consecuencia, se redescribe en detalle. Para estabilizar la taxonomia, se designa un neotipo para la especie A. simplex . ]

Isocheles aequimanus (Dana, 1852) (Decapoda, Anomura, Paguroidea):revalidación para la carcinofauna chilena

The presence of Isocheles aequimanus (Dana, 1852) is confirmed to Chile is review. A key to identify the Chilean hermit crabs (Paguroidea) species is included.

Poliquetos pelágicos (Annelida, Polychaeta) del Pacífico suroriental frente a Chile e islas oceánicas

RESUMEN. Durante los cruceros de investigacion Cimar 5 y Cimar 6, en aguas del Pacifico suroriental frente a Chile e islas oceanicas (isla de Pascua, San Felix, San Ambrosio y archipielago de Juan Fernandez), se recolectaron mediante una red de arrastre horizontal y vertical IKMT, un total de 109 poliquetos pelagicos pertenecientes a 12 especies de cuatro familias. En el total de las muestras analizadas se determinaron las especies Torrea pelagica, Vanadis crystallina, V. formosa, V. longissima, V. minuta, Watelio gravieri, Lopadorhynchus uncinatus, Pelagobia longicirrata, Enapteris euchaeta, Tomopteris carpenterii, T. septentrionalis y Drieschia nans. Todos los taxa presentan un patron de distribucion cosmopolita a excepcion de Torrea pelagica y Drieschia nans que serian endemicas para el Pacifico sur. Se determinaron seis especies de Alciopidae (50% de abundancia relativa), tres especies de Tomopteridae (25%), dos especies de Lopadorhynchidae (16,7%) y una especie de Polynoidae (8,3%). Se registra por primera vez la presencia en aguas del Pacifico suroriental frente a Chile e islas oceanicas de L. uncinatus, P. longicirrata, V. minuta, V. crystallina y W. gravieri. Con esto el numero total de especies de poliquetos pelagicos registradas frente a Chile e islas oceanicas llega a 19. Se discute la necesidad de aumentar los muestreos planctonicos cuantitativos para incrementar el conocimiento acerca de la biologia y ecologia de los poliquetos pelagicos del Pacifico suroriental, a fin de establecer sus relaciones en la dinamica oceanica del plancton. Palabras clave: Polychaeta, holoplancton, islas oceanicas, isla de Pascua, Chile.

Primer registro de Trichopeltarion corallinus (Faxon, 1893) para el mar de Chile y nuevo registro de T. hystricosus (Garth, en Garth & Haig, 1971) (Decapoda: Brachyura: Atelecyclidae)

Trichopeltarion corallinus (Faxon, 1893), a decapod of the family Atelecyclidae, is recorded for the first time in Chile. Seven specimens were captured by bo...

Amphionides reynaudii (H. Milne Edwards, 1832) (Amphionidacea: Amphionididae): identificación de estadios larvales y nuevo orden de crustáceos en aguas oceánicas chilenas

Some larval stages of the Amphionides reynaudii are identified, only representative of the Order Amphionidacea are registed for the first time for Chilean oceanic waters. The specimens were collected during the development of the cruises to the Chilean oceanic islands, in a transect between Caldera and Easter Island (spring 1999) and Juan Fernandez archipelago and Desventuradas Islands (spring 2000). The presence of this order of crustaceans in the waters of the southeastern Pacific ocean is discussed and an identification key for their recognition in the plankton samples is included.

Petrolisthes extremus o Petrolisthes coccineus (Decapoda Anomura Porcellanidae), ¿están las dos especies presentes en Isla de Pascua?

Two morphologically similar species of porcellanid crabs have been cited around Easter Island, Petrolisthes coccineus and P. extremus. New material collected in different locations of the island, only support the presence of P. extremus. The specimens used in the records of P. coccineus in Easter Island are deposited in the Museo Nacional de Historia Natural of Santiago and the Museo de Zoologia of the Universidad de Concepcion. After checking this material identified as P. coccineus, it was concluded that just one species is found in Easter Island and correspond to P. extremus.

A review of the Munidopsidae Ortmann, 1898 (Decapoda, Galatheoidea) in Chilean waters, including new records for the Southeastern Pacific

The information about the family Munidopsidae in Chile is scarce and sparse, making identification of new material. difficult. Due to this we lack precise information about the number and accurate distribution of Chilean species. Recent expeditions to Chile have collected specimens of this group, allowing an exhaustive review of the registers and collections in four museums in the country. A total of 93 specimens from six expeditions were analyzed, belonging to twelve species, of which five represent first records for the Chilean waters. The family in Chile is now composed by 19 bathyal and abyssal species; three belong to the genus Galacantha and 16 to Munidopsis. Only three species have distributions restricted to southeastern Pacific waters (M. cochlearis, M. follirostris and M. opalescens). Three other species are widely distributed along the eastern Pacific from Alaska or from Oregon to Chile (M. aspera, M. quadrata and M. verrucosus). No relationships were observed between the extensive geographical distribution of species and the bathymetric distribution.

OPLOPHORIDAE (DECAPODA, CARIDEA) IN SOUTEASTERN PACIFIC OCEAN: REVISION OF CHILEAN SPECIES

Se revisan las especies chilenas de la familia de camarones Oplophoridae. Se entregan nueve nuevos registros, cuatro de ellos citados por primera vez para el Pacifico sur este: Acanthephyra trispinosa Kemp, 1939, Systellapsis braueri (Balss 1914) Ephyrina ombango Crosnier & Forest 1973 y Oplophorus spinosus (Brulle 1839). Con estos nuevos registros se eleva a 16 el numero de especies de esta familia distribuidas en aguas del Pacifico sur este frente a Chile