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Showing 1 to 20 of 32 for “"Echinodermata"”.
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The foraging strategy of Diadema antillarum (Philippi) (Echinodermata: Echinoidea)
<p>Diadema antillarum (Philippi) is a common echinoid grazer in Caribbean reef areas. Field observations in st . Croix, u.s.v.r. an.d Disc. overy Bay, Jamaica and laboratory experiments demonstrate that these urchins have a strong feeding preference for algal turf. Seasonal variation in the …
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Phylogeny, Evolution, and Biodiversity of the Goniasteridae (Asteriodea; Echinodermata)
Comprehensive phylogenetic hypotheses for the Goniasteridae provides a strong context for establishment of new genera and species. Goniasterid starfish represent among the most poorly known of asteroid groups. Only 75% of the goniasterid fauna was known at the end of the 20th Century. This study …
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Keanekaragaman jenis echinodermata di Pantai Kondang Merak Kecamatan Donomulyo Kabupaten Malang
… baik berupa tumbuhan ataupun hewan. Echinodermata merupakan salah satu hewan yang sangat penting dalam ekosistem laut khususnya daerah terumbu karang dan bermanfaat sebagai salah satu komponen dalam rantai makanan, yaitu pemakan detritus dan hewan kecil lainnya. Pantai Kondang Merak …
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Estratégia reprodutiva e gametogênese de Cassidulus mitis Krau, 1954 (Echinodermata: Echinoidea)
Cassidulus mitis Krau is an endemic species from Rio de Janeiro, Brazil. To verify its reproductive cycle, samples were taken from October 1998 to April 2000 at Vermelha Beach. Sex ratio of 1 (x2= 1.48; a0.05=3.84; DF= l) was found for C. mitis. Reproduction occurs overall the year. Gonadal index …
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Taxonomy, biodiversity and biogeography of the brittle stars (Echinodermata: Ophiuroidea) of South Africa
… the region to 136. The genus Ophiocoma Agassiz (Echinodermata: Ophiuroidea: Ophiurida: Ophiocomidae) is reviewed and the number of species in South Africa increased from four to eight. All species are briefly discussed in terms of taxonomy, geographic distribution and ecology. Furthermore, the …
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Contribuição ao estudo do gênero Echinaster Muller & Troschel, 1840 (Echinodermata: Asteroidea) no litoral brasileiro
383 specimens of Echinaster are studied from 12 localities along Brazilian coast south of the state of Ceará. Besides description of characters, four numerical variables are compared graphically for each locality. The following result was obtained: it was only found E. echinophorus (Lamarck), in …
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Variação temporal em estrelas-do-mar Asterina stellifera (Echinodermata: Asteroidea) na Baía de Guanabara, Rio de Janeiro
Guanabara Bay, located in the State of Rio de Janeiro, is an area of multiple uses (e.g. ecology, tourism, fishing). The Bay has been through a process of environmental degradation, due to populational and industrial growth on its neighbourhoods. Morphometrical and numerical data on the seastar …
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Ciclo reprodutivo de Echinaster (Othilia) brasiliensis Müller & Troschel, 1842 (Echinodermata: Asteroidea) na região do Cabo Frio, RJ
ln the present study specimens of Echinaster (Othilia) brasiliensis were collected monthly at João Fernandes Beach, Búzios, Brazil, from August 1999 to December 2000. Reproductive cycle was studied using gonad index and histological analysis of gonads. E. (O.) brasiliensis exhibited a continuous …
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Distribuição, abundância e hábito alimentar de Asteroidea (Echinodermata) de fundos inconsolidados da Plataforma Continental do Cabo Frio, RJ
This study is part of the Cabo Frio Upwelling Ecosystem Integrated Project and aims to verify the specific composition, distribution and diets of asteroids of the Cabo Frio continental shelf, RJ. Asteroide were collected monthly from January 1986 to December 1988 by a 10 m otter-trawl. Twenty …
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Feeding preferences of Tripneustes gratilla Linnaeus Echinodermata Echinodea and the prospect for sea urchin aquaculture in South Africa
Sea urchin aquaculture for human food is a major industry, and there are prospects for the industry in South Africa. Feeding preferences of the sea urchin Tripneustes gratilla were tested by two different methods; a touch-preference test and a 48-hour consumption test. A touchpreference is …
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Ciclo reprodutivo, gametogênese e desenvolvimento larval de Asterina stellifera (Möbius, 1859) (Echinodermata: Asteroidea) na região de Cabo Frio, RJ
The development and reproductive cycle of Asterina stellifera were studied from amples taken from populations in two distinct habitats from Cabo Frio. One is an intertidal seagrass flat at Japonês lsland ( 1994-1995); the second is a sublittoral rocky-shore at Pontal Beaches ( 1999-2000). …
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The primary structures and the evolutionary consequences of the olisthodiscus luteus histone proteins
… to the algae was found to be that of the echinodermata. An endosymbiotic event between an echinodermata ancestor and a primitive unicellular alga is hypothesised in an attempt to explain the smilarity between the histones.
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Biologia reprodutiva e estrutura de duas populações de Coscinasterias tenuispina (Lamarck, 1816) (Echinodermata: Asteroidea) na região do Cabo Frio, Rio de Janeiro
Sexual and asexual reproduction of the fissiparous asteroid Coscinasterias tenuispina were studied in two populations at Cabo Frio region, Rio de Janeiro, from August 1999 to December 2000. One population occurs on subtidal region at Prainha, Arraial do Cabo, and the other occurs on intertidal …
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Palaeobiology of Palaeozoic medusiform stem group echinoderms.
… to a new class), lies within the stem group Echinodermata. As a consequence, current understanding of the early evolution of the Echinodermata, especially with respect to internal anatomy, is questioned . A number of medusiforrn fossils, not studied in detail as part of this work, are …
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Comparação interpopulacional de caracteres morfológicos e reprodutivos do ouriço-do-mar Arbacia lixula (Linnaeus, 1758) (Echinodermata: Echinoidea) em duas localidades do litoral do estado do Rio de Janeiro
Arbacia lixula (Linnaeus, 1758) is a common echinoid on the Brazilian coast, although there are few studies about this species in the South Atlantic Ocean. This work aims to compare morphological and reproductive traits in two sea urchin populations and verify the reproductive cycle of Arbacia …
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Exploring the morphospace of cidaroid echinoid spines.
Crown group cidaroids (Echinodermata: Echinoidea: Cidaroida) display a variety of spine morphologies thought to be adapted in response to selective pressures around them. Echinoid spines directly interact with their surroundings and morphologies should reflect environmental conditions changing …
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