Holothuria (Cystipus) casoae una nueva especie de holoturia (Echinodermata: Holothuroidea) del Océano Pacífico oriental central.

Holothuria (Cystipus) casoae n. sp. is described from the central-eastern Pacific, from depths between 45 and 100 m. The main characters separating H. (C.) casoae from the rest of the species included in the subgenus Cystipus are the presence of a prominent fringe of 10 or more conical papillae along each side of the body and the presence of tables with a spinose rim, the pillars of the spire are short ending in a complex spiny crown with a small central circular opening. This new species is distinctive in the genus Holothuria, subgenus Cystipus, but shows some similarities to H. (C.) cubana Ludwig, 1875, H. (C.) inhabilis Selenka, 1867 and H. (C.) pseudofossor Deichmann, 1930.Holothuria (Cystipus) casoae n. sp. se describe para el Pacífico Central Este, a profundidades de 45-100 m. Los principales caracteres que separan a H. (C.) casoae del resto de las especies incluidas en el subgénero Cystipus son: la presencia de un margen lateral formado por 10 o más papilas cónicas a cada lado del cuerpo, y la presencia de espículas en forma de tablas con borde espinoso, con espiras de pilares cortos, terminando en una corona compleja de pequeñas espinas y con un agujero central. Esta nueva especie pertenece al género Holothuria, subgénero Cystipus, pero muestra algunas similitudes con sus congéneres H. (C.) cubana Ludwig, 1875, H. (C.) inhabilis Selenka, 1867 and H. (C.) pseudofossor Deichmann, 1930

Primer registro del pepino de mar nadador Enypniastes eximia Theel, 1882 (Echinodermata: Holothuroidea) en aguas peruanas

Enypniastes eximia Théel, 1882 (Echinodermata: Holothuroidea) a swimming sea cucumber is reported for the first time from Peru. The species was collected in the Continental rise (563-1,201 m) off Trujillo Department. Reference material has been deposited in the Coleccion Cientifica del Instituto del Mar del Peru (IMARPE), Lima, Peru.Se registra por primera vez para el Perú la especie pelágica de pepino de mar Enypniastes eximia Théel, 1882 (Echinodermata: Holothuroidea). La especie fue recolectada en el talud continental (563-1,201 m) frente al departamento de Trujillo. Material de referencia se encuentra depositado en la Colección Científica del Instituto del Mar del Perú (IMARPE), Lima, Perú

First report of Paelopatides (Synallactida, Synallactidae) for the SW Atlantic, with description of a new species from the deep-sea off Argentina

The present study describes a new species, Paelopatides shumel n. sp., from Argentinian deep-sea waters. This is the first report of the order Synallactida for Argentina, the fifth for southern hemisphere and the deepest report for the Argentinian holothuroid fauna (almost 3000 m). The species has up to 330 mm length, light brown color and around 19 pairs of dorsal appendages. The ventral side has one ventral ambulacra, with two rows of tube feet. Ossicles are present in dorsal appendages, tube feet, tentacles and body wall near the anus, and are mainly crosses, tables and rods-shaped. The depth at which P. shumel n. sp. has been found is occupied by the North Atlantic Deep Water current. This association with North Atlantic waters could be related with the occurrence of members of Paelopatides in the North Atlantic.Fil: Martinez, Mariano Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Solís Marín, Francisco A.. Universidad Nacional Autónoma de México; MéxicoFil: Penchaszadeh, Pablo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

Benthodytes violeta, a new species of a deep-sea holothuroid (Elasipodida: Psychropotidae) from Mar del Plata Canyon (south-western Atlantic Ocean)

A new species of elasipodid holothuroid, Benthodytes violeta sp. nov., is described from the Mar del Plata Canyon off Buenos Aires Province (around 38ºS–54ºW). It was taken at four locations at depths ranging from 1500 to 1950 m. This new species has a violet gelatinous body of up to 200 mm in length, with eight pairs of dorsal appendages, lateral festooned edges and four rows of tube feet ventrally. Body wall ossicles comprise rods and crosses with three or four arms and a central bipartite apophysis borne on the primary cross; tentacles and gonad deposits comprise rods and crosses with three and four arms. This is the first report of a holothuroid from the Mar del Plata Canyon area.Fil: Martinez, Mariano Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Solís Marín, Francisco Alonso. Universidad Nacional Autónoma de México; MéxicoFil: Penchaszadeh, Pablo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

Three new records of asteroids (Echinodermata: Asteroidea) from Peru

En el presente trabajo se registran 3 nuevos asteroideos (Echinodermata: Asteroidea) de aguas someras (4 - >50 m) para el Perú: Astropecten regalis Gray, 1840, Paulia horrida Gray 1840 y Meyenaster gelatinosus (Meyen, 1834). Astropecten regalis se conocía desde el Golfo de California hasta Panamá, en el presente trabajo, se amplía su distribución hasta Máncora, Perú. La distribución geográfica de Paulia horrida era conocida desde Baja California, hasta Isla Cocos, Costa Rica, en este estudio se amplía su distribución geográfica hasta Punta Sal, Perú. A Meyenaster gelatinosus se le conocía solo de Chile, en el presente trabajo se registra y confirma su presencia en el Perú, ampliando su distribución norte hasta San Juan de Marcona. Se proporciona información morfológica de las especies, características del hábitat y fotografías in situ y de los especímenes recién recolectados.The aim of this work is to present three new shallow water (4 - >50 m) records of asteroids (Echinodermata: Asteroidea) for the Peruvian fauna: Astropecten regalis Gray, 1840, Paulia horrida Gray 1840 and Meyenaster gelatinosus (Meyen, 1834). Astropecten regalis geographical distribution is known that ranges from Gulf of California to Panama, this discovery extends its distribution to Mancora, Peru. Paulia horrida is known from Baja California to Isla Cocos, Costa Rica, and this record extends its southern distribution limit to Punta Sal, Peru. Meyenaster gelatinosus was considered endemic to Chilean waters, however, this record confirm its presence in Peru extending its northern distribution limit to San Juan de Marcona, Peru. Morphological and habitat information on this four species is provided, together with live pictures

Equinodermos de las Islas Lobos de Afuera (Lambayeque, Perú)

A rapid survey in Islas Lobos de Afuera (06°55,5 S - 80°42,5 W) were carry out from June 19 to 24 of 1999. A total of 39 Echinodermata species was collected: 7 Asteroidea, including two new records for Peru, Luidia bellonae, Luidia brevispina; 8 Ophiuroidea, whit one new record for Peru Ophionereis sp.; 11 Echinoidea, including five new records for Peru, Astropyga pulvinata, Diadema mexicanum, Lytechinus sp., Toxopneustes roseus, Tripneustes depressus; and 13 Holoturoidea, including six new records, Psolidium dorsipes, Cucumaria flamma, Pseudocnus californicus, Holothuria sp., Chiridota sp. and Actinopyga sp.Del 19 al 24 de junio de 1999 se llevó a cabo una expedición para realizar el inventario rápido de los equinodermos de las Islas Lobos de Afuera (06°55,5 S - 80°42,5 W). Se colectó un total de 39 especies de equinodermos: 7 asteroideos (2 nuevos registros para el Perú: Luidia bellonae, Luidia brevispina); 8 ofiuroideos (1 nuevo registro para el Perú: Ophionereis sp.); 11 equinoideos (5 nuevos registros para el Perú: Astropyga pulvinata, Diadema mexicanum, Lytechinus sp., Toxopneustes roseus, Tripneustes depressus) y 13 holoturoideos (6 nuevos registros: Psolidium dorsipes, Cucumaria flamma, Pseudocnus californicus, Holothuria sp., Chiridota sp. y Actinopyga sp.)

Influence of Modularity and Regularity on Disparity of Atelostomata Sea Urchins

A modularity approach is used to study disparity rates and evolvability of sea urchins belonging to the Atelostomata superorder. For this purpose, the pentameric sea urchin architecture is partitioned into modular spatial components and the interference between modules is quantified using areas and a measurement of the regularity of the spatial partitions. This information is used to account for the variability through time (disparity) and potential for morphological variation and evolution (evolvability) in holasteroid echinoids. We obtain that regular partitions of the space produce modules with high modular integrity, whereas irregular partitions produce low modular integrity; the former ones are related with high morphological disparity (facilitation hypothesis). Our analysis also suggests that a pentameric body plan with low regularity rates in Atelostomata reflects a stronger modular integration among modules than within modules, which could favors bilaterality against radial symmetry. Our approach constitutes a theoretical platform to define and quantify spatial organization in partitions of the space that can be related to modules in a morphological analysis

Recruitment patterns of 2 sea cucumber species in a Central Mexican Pacific coral reef community

AbstractHolothurians are nutrient recyclers, bioturbators, and prey for other taxa in diverse marine ecosystems; thus, they directly impact the distribution of organisms with which they are associated. However, little is known about annual changes in holothurian recruitment. Islas Marietas harbors a coral community with a rich assemblage of holothurians. From March 2011 to February 2012, bimonthly samplings were performed in order to identify the annual recruitment patterns of species Pentamera chierchia and Neothyone gibber. Density (indcm−2) was assessed for each of the 2 species, as was the micro-substrate abutting them. Both species had highest densities in the May and June period (N. gibber=0.0903indcm−2; P. chierchia=0.0396indcm−2); densities<0.01indcm−2 were documented over the remainder of the year. This is the first record of P. chierchia in the study area. Furthermore, no correlation between species density and substrate type was found (s≤0.61, n=7, p>0.05). The study of seasonal recruitment fluctuations of reef-associated holothurians and their relationship with factors such as reproduction and availability of coralline substrate may provide information on their life cycles, in order to initially understand some ecological patterns of these species that contribute to the maintenance of regional biodiversity

First record of Florometra magellanica (Bell, 1882) (Echinodermata: Crinoidea) in Peru

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.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

New record of the starfish Ophidiaster ludwigi (Echinodermata: Asteroidea) from the Pacific of Mexico and Costa Rica

Ophidiaster ludwigi had been reported only from Panama and Peru. Here we add record of the genus and species for Mexico and Costa Rica; and, first time its bathymetric distribution (0-156 m)New record of the starfish Ophidiaster ludwigi(Echinodermata: Asteroidea) from the Pacific of Mexico and Costa Rica. Ophidiaster ludwigi ha sido registrado solo para Panama y Perú. Aquí nosotros adicionamos registros del género y la especie para México y Costa Rica; y, por la primera vez, distribución batimétrica (0-156 m).UCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Ciencias del Mar y Limnología (CIMAR