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Registros recuperados: 32 | |
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Hartog, J.C. den. |
The genus Amphiprion Bloch & Schneider, 1801, is represented in the Seychelles by two species, A. akallopisos Bleeker, 1853, and the endemic A. fuscocaudatus Allen, 1972. Throughout its distributional range Amphiprion akallopisos has exclusively been recorded to associate with the clownfish anemones Heteractis magnifica (Quoy & Gaimard, 1833) and Stichodactyla mertensii Brandt, 1835. During the Netherlands Indian Ocean Programme (NIOP) Seychelles Expedition 19921993 this was confirmed for the Seychelles, although the species was predominantly found with H. magnifica, the most common host anemone in the islands. So far, Amphiprion fuscocaudatus had exclusively been reported as a symbiont of Stichodactyla mertensii. During the NIOP Seychelles... |
Tipo: Article / Letter to the editor |
Palavras-chave: Seychelles; Indo-West Pacific; Amphiprion; Clownfish anemones; Clownfish/host associations; Host preference; Competition; New records; 42.81. |
Ano: 1997 |
URL: http://www.repository.naturalis.nl/record/319315 |
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Hartog, J.C. den. |
A concise survey is presented of the species of the crab genus Cycloes De Haan, 1837 (Brachyura: Calappidae). Notes are presented on the associated ocurrence, on shallow sandy bottoms in the Canary Islands (Lanzarote, Gran Canaria), of the eastern Atlantic Cycloes cristata (Brullé, 1837) and the fishes Bothus podus (De la Roche, 1809) (Bothidae), Trachinus draco L., 1758 and T. cf. araneus Cuvier, 1829 (Trachinidae). |
Tipo: Article / Letter to the editor |
Palavras-chave: Cycloes cristata (Brachyura; Calappidae); Associated occurrence; Fish; Bothus podus; Trachinus ssp; 42.74. |
Ano: 1987 |
URL: http://www.repository.naturalis.nl/record/319393 |
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Hartog, J.C. den; Türkay, M.. |
A new species of Platypodiella Guinot, 1967, from the island of St. Helena, P. georgei spec, nov., is described. This species was found associated with encrusting species of Palythoa Lamouroux, 1816 (Zoantharia). Ample evidence is presented that both the eastern Atlantic P. picta (A. Milne-Edwards, 1869) and the western Atlantic P. spectabilis (Herbst, 1794) also live habitually associated with encrusting species of Palythoa, rarely with other zoantharians. For each of the two East-Pacific members of the genus, P. rotundata (Stimpson, 1860) and P. gemmata (Rathbun, 1902), there is at least one rather detailed published record suggesting that these species too associate with Palythoa. Thus, this habit would seem to go for all five members of the genus. Data... |
Tipo: Article / Letter to the editor |
Palavras-chave: Crustacea; Brachyura; Xanthidae; Platypodiella; Association; Zoantharia; Palythoa; Atlantic Ocean; St. Helena; Cape Verde Islands; Senegal; Eastern Caribbean; 42.74. |
Ano: 1991 |
URL: http://www.repository.naturalis.nl/record/318097 |
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López-González, P.J.; Hartog, J.C. den; García-Gómez, J.C.. |
A new genus and species of sea anemone, Onubactis rocioi gen. et spec. nov. (Actiniidae) is described from the Atlantic coast of the southern Iberian Peninsula. The main features of Onubactis rocioi are: a smooth to corrugate scapus, a delicate scapulus provided with a ruff of non-adherent papillate outgrowths, absence of acrorhagi, more mesenteries distally than proximally, a weak diffuse sphincter, and presence of numerous spirocysts in the pedal disc. The new genus is discussed in relation to five other genera which are characterized by a distal ruff of columnar outgrowths: Actinostella Duchassaing, 1850; Oulactis Milne-Edwards & Haime, 1851; Saccactis Lager, 1911; Isocradactis Carlgren, 1924; and Isoulactis Carlgren, 1959. Of these, it seems... |
Tipo: Article / Letter to the editor |
Palavras-chave: Actiniaria; Actiniidae; Onubactis rocioi gen. et spec. nov.; Southern Iberian Peninsula; 42.72. |
Ano: 1995 |
URL: http://www.repository.naturalis.nl/record/319308 |
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Hartog, J.C. den. |
Bunodes biscayensis Fischer, 1874, a species of Actiniaria described from Moulleau, Arcachon, south-western coast of France, and never recorded since, was rediscovered in July 1985 and found again in 1986 and 1987 in several localities along the French "Côte Basque" between the mouth of the river Adour and St. Jean-de-Luz. The species is here redescribed and referred to Bunodosoma Verrill, 1899, a genus of tropical and subtropical Atlantic and West-American intertidal and shallow water forms, hitherto not recorded from the Mediterranean and/or the Atlantic coast of Europe. Speculations are advanced as to the possible further distribution of B. biscayensis. A discussion is added concerning the morphological terms verruca and vesicle. The study is completed... |
Tipo: Article / Letter to the editor |
Palavras-chave: Actiniaria; Bunodosoma biscayensis; Verruca; Vesicle; Nematocysts; Distribution; France; Côte Basque; 42.72. |
Ano: 1987 |
URL: http://www.repository.naturalis.nl/record/318818 |
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Hartog, J.C. den. |
The first Western Palearctic record of a Red-footed Booby Sula sula (L., 1766), a brown whitetailed morph observed on Cima (Cape Verde Islands), is described. The status of this species in the tropical South Atlantic Ocean is evaluated. At present, Fernando de Noronha is the only South Atlantic stronghold of the species (ca. 4000 individuals; cf. Oren, 1984). The species has disappeared, or almost so, from other islands (St. Helena: absent; Ascension:0-30 individuals; Ilha da Trindade: less than 100 pairs). A link may exist between the apparent recent increase of the population of Fernando de Noronha and the apparent recent decline of the Trindade population. It seems possible that the Trindade population for some unknown reason has migrated to Fernando de... |
Tipo: Article / Letter to the editor |
Palavras-chave: Sula sula; Cape Verde Islands; South Atlantic Islands; Status; 42.83. |
Ano: 1987 |
URL: http://www.repository.naturalis.nl/record/318544 |
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Hartog, J.C. den. |
Volgens gangbare inzichten zijn vrijwel alle oceanische eilanden uit zee opgerezen, wat impliceert dat ze oorspronkelijk kaal en zonder enig leven waren. Biologen zijn daarom bijzonder geïnteresseerd in het karakter en de herkomst van de huidige flora en fauna van die eilanden en in de kolonisatieprocessen. In het algemeen kan men stellen dat de kans op kolonisatie kleiner is naarmate een eiland verder van het vasteland (of van een ander eiland) verwijderd ligt. In feite is de zaak natuurlijk wel iets gecompliceerder, en spelen allerlei factoren een rol. Voor landorganismen zijn dit onder meer de klimatologische en meteorologische omstandigheden in het te overbruggen gebied, en de vestigingsmogelijkheden in de nieuwe omgeving. Kolonisatie door mariene... |
Tipo: Article / Letter to the editor |
Palavras-chave: Islands; Transformation; Colonisation; Endemism; Saint Helena; 42.94. |
Ano: 1985 |
URL: http://www.repository.naturalis.nl/record/460100 |
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Hartog, J.C. den; Ocaña, O.; Brito, A.. |
Species of Corallimorpharia collected during the CANCAP expeditions in the south-eastern part of the North Atlantic are described and discussed, altogether five species belonging to three genera of Corallimorphidae: the shallow water forms Corynactis viridis Allman, 1846, Pseudocorynactis caribbeorum den Hartog, 1980, and P. caboverdensis spec. nov., and the deep-sea forms Corallimorphus cf. atlanticus Carlgren, 1934, and C. ingens Gravier, 1918. The taxonomic status of the representatives of the genus Corynactis Allman, 1846, is discussed. All temperate to subtropical species described so far belong to a group of closely related allopatric taxa forming the Corynactis viridis-complex, possibly representing a single species only. The colours of Corynactis... |
Tipo: Article / Letter to the editor |
Palavras-chave: Corallimorpharia; Corallimorphidae; Corallimorphus; Corynactis; Pseudocorynactis; Sideractis; Nectactis; Nematocysts; Ontogeny; Distribution; Feeding; CANCAP-project; South-eastern North Atlantic; Macaronesia.; 42.72. |
Ano: 1993 |
URL: http://www.repository.naturalis.nl/record/317646 |
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Hartog, J.C. den; Clarke, M.R.. |
Data are presented on the diet of Cory's Shearwater Calonectris diomedea borealis (Cory, 1881) resulting from stomach investigations based on 18 birds from Hierro (Canary Islands), 5 from Selvagem Grande (Selvagens or Salvage Islands), 2 from São Miguel and 1 from São Jorge (Azores), collected between 1977 and 1981. These data confirm the general idea that this shearwater feeds principally on fish and squid. The glandular stomachs of 9 birds from Hierro contained significant quantities of food, varying in wet weight from ca. 4-40 gm; in four cases more or less complete squids were present, all Ommastrephes bartrami (Le Sueur, 1821). In addition, the gizzards of all 26 birds, except one, contained fragments of squid beaks belonging to 12 species. Several of... |
Tipo: Article / Letter to the editor |
Palavras-chave: Procellariidae; Calonectris diomedea borealis (Cory; 1881); Diet; Stomach contents; Cephalopoda; SE North Atlantic; Macaronesia; 42.83. |
Ano: 1996 |
URL: http://www.repository.naturalis.nl/record/318278 |
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Fautin, D.G.; Hartog, J.C. den. |
The sea anemone species Isactinernus quadrilobatus Carlgren, 1918, and Synactinernus flavus Carlgren, 1918, which were described in new monotypic genera from few specimens collected in southern Japan, are synonymized, based on many more specimens from the South Pacific. As well as the geographic range, the depth range of this species has been extended to 110-700 m. The species had been distinguished primarily on whether the oral disc had four lobes (I. quadrilobatus) or eight (Synactinernus flavus) – we conclude their number is largely related to size of the animal. Other features that Carlgren had used to differentiate the genera (and species) are inconsistently present and do not correlate with lobe number. |
Tipo: Article / Letter to the editor |
Palavras-chave: Endocoelantheae; Mesenteries; Biogeography; Synactinernus flavus; 42.79. |
Ano: 2003 |
URL: http://www.repository.naturalis.nl/record/220298 |
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Registros recuperados: 32 | |
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