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Registros recuperados: 12 | |
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Dahms, Hans-Uwe. |
The copepodite antennule development of representatives of 6 harpacticoid families is studied and discussed in detail and that of 8 genera of harpacticoids from 7 families is schematically illustrated. Twenty-seven genera out of 17 harpacticoid families are compared on the basis of own investigations and data from the literature. The origin of newly formed segments can be determined by seta numbers of segments, relative segment length, furrows indicating previous articulations and by the position of the segment which bears the proximal aesthetasc. There are 2 zones of segment formation, both located in the middle part of the first antenna. Normal segment formation takes place distally from the second, aesthetasc-bearing segment from C I to C II and... |
Tipo: Article / Letter to the editor |
Palavras-chave: Morphology; Postembryonic development; Taxonomy; Phylogeny; Developmental pattern; Harpacticoida. |
Ano: 1989 |
URL: http://www.repository.naturalis.nl/record/504074 |
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Falavigna Da Rocha, Carlos Eduardo; Torres, Isabela Claret; Maia-Barbosa, Paulina Maria. |
The cyclopid genus Haplocyclops Kiefer, 1952, generally considered as a subgenus of Bryocyclops, is revalidated, and its diagnosis emended. Haplocyclops torresi sp. n. is described from the Rio Doce, State of Minas Gerais, Brazil, the first record of this genus from the South American continent. Harpacticoids found in the same river were identified as Potamocaris estevesi Reid, 1991. The latter species is redescribed, the female described for the first time, and its distribution area is widened with new records in rivers of the southeastern part of Brazil. The mouthparts of P. estevesi are described for the first time. |
Tipo: Article / Letter to the editor |
Palavras-chave: Copepoda; Harpacticoida; Cyclopoida; Haplocyclops; Potamocaris; Brazil. |
Ano: 1998 |
URL: http://www.repository.naturalis.nl/record/504778 |
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Dürbaum, Johannes. |
Precopulatory mate guarding and mating behaviour of Tachidius discipes Giesbrecht, 1881, has been analysed using a video camera mounted on a microscope. Males preferably accompany fourth or fifth stage female copepodids during precopulatory mate guarding; only rarely are third copopodid stages guarded. Rare cases of males clasping juvenile males are also known. Males are active during mate guarding and constantly change the site of attachment of their antennules. This behaviour may ensure continued association of the adult male with the juvenile copepodid when the latter moults during the mate guarding phase. The final moult of the female, once observed only, lasts only 2 minutes. Copulation immediately follows but is preceded by the male’s control of the... |
Tipo: Article / Letter to the editor |
Palavras-chave: Copepoda; Harpacticoida; Precopulatory mate guarding; Mating. |
Ano: 1997 |
URL: http://www.repository.naturalis.nl/record/504239 |
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Herman, P.M.J.; Heip, C.H.R.. |
The dependency of respiration rate on body weight at 20°C was determined for five meiobenthic copepods from a brackish-water habitat. The respiration rate of the four smaller species was generally high, = 10-14 nl O<sub>2</sub>.h<sup>-1</sup>.µg dry wt<sup>-1</sup>, but was much lower for larger species, <i>Canuella perplexa</i> T. & A. Scott 1893 (2-3 nl O<sub>2</sub>.h<sup>-1</sup>.µg<sup>1</sup>). This pattern is discussed in terms of the adaptive behaviour of the populations. The significance of respiration rates in the evolution of populations is illustrated by differences between the respiration rates of Belgian <i>Tachidius discipes</i> Giesbrecht... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Respiration; Copepoda [copepods]; Harpacticoida. |
Ano: 1983 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3288 |
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Registros recuperados: 12 | |
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