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| Registros recuperados: 631 | |
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| Lemaitre, R.. |
| As a result of a revision of the genus Parapagurus Smith, three genera are proposed: Parapagurus sensu stricto, Strobopagurus gen. nov., and Sympagurus Smith reinstated. Diagnoses of the three genera are given, and a number of structures are described. A key to aid in the identification of the genera of the family is presented. All taxa heretofore assigned to Parapagurus are reassigned. Four species of Parapagurus and six of Sympagurus occur in the western Atlantic, including a new species, Sympagurus acinops. All western Atlantic species are redescribed. Parapagurus abyssorum (Filhol) is a senior homonym of the eastern Pacific Parapagurus abyssorum Henderson, and a new name, Parapagurus holthuisi, is given to Henderson's taxon. The subspecies of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Deep-water hermit crabs; Parapagurus; Strobopagurus; Sympagurus; Systematic revision; New genus; New species; Morphological variation; Symbiotic associations.; 42.74. |
| Ano: 1989 |
URL: http://www.repository.naturalis.nl/record/317875 |
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[Proceedings of the 5th Symposium on Mesozoic and Cenozoic Decapod Crustaceans, Krakow, Poland, 2013: A tribute to Pál Mihály Müller / R.H.B. Fraaije, M. Hyžný, J.W.M. Jagt, M. Krobicki & B.W.M. van Bakel (eds.)]: Neozanthopsis americana (Decapoda, Brachyura, Carpilioidea) from the Middle Eocene Cane River Formation of Louisiana, USA, and associated teleost otoliths
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Naturalis | |
| Schweitzer, C.E.; Feldmann, R.M.; Stringer, G.L.. |
| A large collection of Neozanthopsis americana (Rathbun, 1928) from the Middle Eocene (Lutetian) Cane River Formation in Louisiana, USA, represents the first opportunity to describe the species in detail. Detailed analysis of associated teleost otoliths and other vertebrate remains documents a palaeoenvironmental setting characterised by a soft-sediment, inner-shelf setting with normal salinity under tropical or subtropical conditions. Anatomical and morphometric analysis of 21 of the better-preserved crabs demonstrates that gender discrimination cannot be made from dorsal carapace characteristics and that the sample represents post-juvenile individuals. Exocuticle and endocuticle are preserved on some specimens and document the presence of erect... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Crabs; Paleogene; Lutetian; Bony fish; Palaeoenvironment; Taphonomy; 42.74; 38.22. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/523038 |
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| Hammen, L. van der. |
| In the course of the last years, I have been investigating the morphology of various groups of mites. During this comparative study, special attention has been paid to the gnathosoma, which organ represents the specialized structure of the mouthparts in this subclass. Recently, while summarizing my results on the phylogeny of the gnathosoma (Van der Hammen, 1969), it appeared necessary to start from a more primitive Arachnid condition in which the chelicerae are still in front of the palps; at the same time, just as in the mites, the coxisternal region of the palp should be present, and the mouth should be in front of the chelicerae. This condition is indeed still found in one primitive order of Arachnidea, viz., the Palpigradida. Representatives of this... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/318742 |
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| Ng, P.K.L.; Sasekumar, A.. |
| A new species of porcellanid crab, Polyonyx vermicola, belonging to the P. sinensis group is described from Selangor, Peninsular Malaysia. The species is an obligate commensal of tubes of the chaetopterid worm Sasekumaria selangora Rullier, 1976 (Polychaeta). Polyonyx vermicola is differentiated from all congeners by its small size, possessing a more rectangular carapace, proportionately longer carpus on the larger cheliped, strongly gaping cheliped fingers, the tips of which are turned outwards, the outer surface of each cheliped fingers lined with a row of small granules, and having the ventral margin of the third ambulatory propodus armed with strong spinules. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Crustacea; Decapoda; Porcellanidae; Polyonyx vermicola spec. nov.; Chaetopteridae; Polychaeta; Worm commensal; Peninsular Malaysia; 42.74. |
| Ano: 1993 |
URL: http://www.repository.naturalis.nl/record/318927 |
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| Hammen, L. van der. |
| In most groups of mites the gnathosoma is rather easy to study as a whole because it can be completely separated from the idiosoma without much difficulty. In Oribatid mites, however, the membrane attaching the chelicerae to infracapitulum and rostrophragma is very thin; separation of the gnathosoma consequently results in tearing the membrane, either between chelicerae and infracapitulum, or between chelicerae and rostrophragma. In both cases the original position of the chelicerae and their exact relation to camerostome and remaining part of gnathosoma, is difficult to reconstruct. As a result of this, only parts of the Oribatid gnathosoma have been described in literature. An extensive study of the infracapitulum (especially of its ventral surface) was... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/317700 |
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| Henry, D.P.; Mclaughlin, P.A.. |
| A qualitative and quantitative study has been made of the Recent taxa assigned, or related, to Balanus amphitrite Darwin. All taxa of the complex have been redescribed and a key provided. Interspecific relationships have been evaluated statistically through the use of the generalized distance function and discriminant function analyses. Two well defined groups and three subgroups have been defined and a key proposed. The discriminant function has also been utilized as an aid in the identification of unknown specimens of a closely related pair of taxa. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1975 |
URL: http://www.repository.naturalis.nl/record/317846 |
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| Kabata, Z.. |
| INTRODUCTION The genus Nicothoe has been known until recently only from its type species, N. astaci Audouin & H. Milne-Edwards, 1826. This species is parasitic on the European lobster, Homarus gammarus (L., 1758), and has received a good deal of attention, in view of the economic importance of its host. Very recently, however, another species, N. analata Kabata, 1966, was described from a decapod host of another genus, Nephrops. Attached to the gills of N. sinensis Bruce, 1966, this parasite was discovered in the South China Sea. The two species differed only in the shape of the trunk, their appendages being identical in all respects. Since the discovery of N. analata, its discoverer, Dr. A. J. Bruce, has been engaged in the study of various species of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1967 |
URL: http://www.repository.naturalis.nl/record/318418 |
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| Greco, G.; Faimali, M.; Davenport, J.. |
| During its life cycle Carcinus maenas (Decapoda, Portunidae) goes through several phases of the moulting process (ecdysis) which allow it to grow despite having a rigid, non-living outer surface. As an individual approaches ecdysis, the exoskeletal calcium is solubilized (decalcification) from the shell and transferred through the integumentary epithelium to the blood, where much of it is transported to cells, tissues and organs of temporary storage where it is later mobilized for deposition into the new exoskeleton. We hypothesised that the decalcification process caused deterioration of the features and structures (e.g. tubercles and setae) characterizing the crab carapace, but that this can be reversed by moulting. We also tested whether wear and tear... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Antifouling; Crustaceans; Epibiosis; Green crab; Moulting process; SEM; 42.74. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/480051 |
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| Bruce, A.J.. |
| In a recent paper preliminary descriptions were given of ten new species of the genus Periclimenaeus Borradaile from the Indo-West-Pacific region (Bruce, 1969). The recent acquisition of further material has provided three new species of the same genus from the Great Barrier Reef and two other new species have also been discovered. Preliminary descriptions of these new species, based primarily on the undissected holotype specimens, are now provided. All specimens, whose hosts were noted, were obtained from sponges, some of which are in the process of identification. The holotype specimens will be deposited in the collections of the Rijksmuseum van Natuurlijke Historie, Leiden, except where they are part of the collections of another museum. Periclimenaeus... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1970 |
URL: http://www.repository.naturalis.nl/record/319322 |
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| Humes, A.G.. |
| Three new siphonostomatoid copepods are associated with Ophiuroidea in the tropical western Atlantic. Collocheres vervoorti spec. nov., from Ophiothrix angulata in Jamaica, has an elongate, gently tapered genital double-somite in the female and the second segment of leg 5 has a distal outer notch. Collocheres lunulifer spec. nov., an associate of Ophiothrix angulata and Ophiothrix suensonii in Barbados, has sclerotized lunules on the basis and first segment of the endopod of leg 1. Ophiurocheres bellulus gen. nov., spec, nov., living on Ophiomyxa flaccida in Puerto Rico, has the third segment of the exopod of leg 1 armed with 11,2,2 and the second segment of leg 5 bears 2 setae in the female and 3 setae in the male. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Copepoda; Siphonostomatoida; Ophiuroidea; Associates; Caribbean; West Indies.; 42.74. |
| Ano: 1998 |
URL: http://www.repository.naturalis.nl/record/317733 |
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| Registros recuperados: 631 | |
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