SEM morphological survey on the egg shell in the italian Anostracans (Crustacea, Branchiopoda)

Mura, Graziella

doi:10.1007/bf00008496

Cited by 59 publications

(41 citation statements)

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“…It has been known that the eggshell of freshwater anostracans normally possesses an ornamented surface (Gilchrist, 1978;Mura, 1986;Shepard and Hill, 2001), which forms a taxonomical tool for the identification of species (Munuswamy and Subramoniam, 1983;Munuswamy et al, 1985;Shepard and Hill, 2001). Little is known about the diversity of the surface topography of the eggshell in genus Artemia.…”

Section: Discussionmentioning

confidence: 97%

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Comparative observations on the cyst shells of seven Artemia strains from China

Wang¹,

Sun²

2007

Microscopy Res & Technique

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The quiescent Artemia cysts of seven geographical origins in China were examined with scanning and transmission electron microscopes. SEM observations on cysts of these Artemia strains showed that the surface topography of cyst shells could be categorized into 6 types: complete smooth surface; smooth surface with sparsely distributed glabrate humps; surface with densely arranged wart-like humps that are composed of packed minute tubercles; rugged surface, with densely arranged tubercles not piling up to form larger humps; shallow-pocked surface; and surface with numerous and densely spaced pore-like fossulae. Some of the patterns were strain specific [e.g., cysts from Ga Hai (GH) are characterized by having a surface with wart-like ornaments that are composed of packed minute tubercles, rugged surface is only found in Chengkou (CK) cysts], and apparent intrastrain variation of cyst surface topography was found in Xizang (XZ), Jingyu Hu, and Xie Chi (SIN) strains. TEM studies on the ultrastructure of cyst shells revealed an apparent divergence in the structure of outer cuticular membrane (OCM) among Artemia strains. In CK, Aqqikkol Hu (AQK), SIN, and GH strains, it is a normal, asymmetrical, and multi-layered structure similar to those described in previous works. In XZ, JYH, and Lagkor Co (LGC) strains, however, the OCM is not obviously multi-layered and the borderlines between OCM and adjacent layers seem indistinct. The present results suggest that the diversity of the surface topography of Artemia cysts may be an available tool for identifying certain Artemia strains as well as for tracking the origins of some Artemia cysts, and the hypoplastic OCM may be a characteristic of the species A. tibetiana.

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Section: Discussionmentioning

confidence: 97%

“…Most Artemia cysts that have been studied by scanning electron microscopy (SEM) were reported to have a smooth surface (Gilchrist, 1978;Mazzini, 1978;Mura, 1986;Ramasubramanian and Munuswamy, 1993;Rosowski et al, 1997, Fig. 5;Shepard and Hill, 2001;Spotte and Anderson, 1988, Figs.…”

Section: Introductionmentioning

confidence: 97%

Comparative observations on the cyst shells of seven Artemia strains from China

Wang¹,

Sun²

2007

Microscopy Res & Technique

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“…The egg surface has shallow, irregular polygonal fields (Fig. 6h), similar to the ornamental pattern found in the Italian (Mura, 1986), Moroccan (Mura and Thiery, 1986), Spanish (Alonso and Alcaraz, 1984), Russian (Vekhov, 1990), and French (Thiery and Gasc, 1991) populations.…”

Section: Faunisticsmentioning

confidence: 88%

Anostracans (Branchiopoda) of Botswana: Morphology, Distribution, Diversity, and Endemicity

Brendonck

Riddoch

1997

Journal of Crustacean Biology

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Including the present update, 14 anostracan species, belonging to Streptocephalus (8), Branchipodopsis (3), and Branchinella (3) are currently reported from Botswana. Branchinella spinosa and Branchipodopsis kalaharensis are the only species not occurring in neighboring southern African countries, with only the latter being a true endemic to Botswana. Streptocephalus cf. bidentatus and S. cf. cladophorusldendrophorus, distinct morphs close to the South African S. bidentatus, and to both S. dendrophorus and S. cladophorus, respectively, are additions to the fauna of Botswana, but are not given specific status. Branchinella ondonguae is also reported for the first time from Botswana. Higher species richness (33) and endemicity (64%) in South Africa are attributed to greater habitable surface area, topographic and environmental heterogeneity, and research effort. A high degree of overlapping ranges of cognate species is observed, and 2 pairs of sister species (Streptocephalus macrourus/S. cf. bidentatus and S. cafer/S. indistinctus) were found in syntopy. The occurrence of specimens with intermediate or odd morphology in the presence of, or in the area of overlap of, supposed parental species, suggests natural hybridization between S. cafer X S. indistinctus, and between S. macrourus Ã� S. cf. bidentatus. No species were found in areas with less than 350 mm of mean annual rainfall. Species of Branchipodopsis are the only anostracans in often clear, short-lived rock pools. Expanding agricultural and mining industries, roadworks, together with inappropriate conservation management, are the most important threats to the temporary pool habitats in Botswana.Botswana constitutes a major gap in our knowledge of the species composition and distribution of anostracans in southern Africa, inhibiting sound biogeographic interpretations. Most species recorded from Botswana to date were collected near the eastern and southern borders (Daday, 1910; Barnard, 1929; Hamer et al., 1994b) and from the northern Kalahari (Barnard, 1935). For some of these species, descriptions need to be amplified with additional characters that have proved their usefulness in the last decade. Furthermore, there is a need of detailed analyses of species distributions and morphology in a defined environmental context. This may provide insight into species affinities, specific ecological tolerances, and processes that cause and maintain current species and morphological diversity in ephemeral and unpredictable habitats.In this paper, we present the findings of recent collections of specimens and mud containing resting stages from about 200 localities in Botswana, including many previously unsampled areas (Fig. 1). We sampled a variety of temporary habitats, such as ditches, mud pools, rock pools, salt pans, artificial flood plains, and dams. MATERIALS AND METHODSSpecimens obtained from mud with resting stages were raised in the laboratory by inundation with distilled water at 25°C. Animals were fed ad libitum microalgae (Selena.rtrum capricorn...

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“…In this case, the reference description of egg morphology in the literature was from eggs collected directly from adults and not from extracted eggs (Mura, 1986;Rabet, 2010). The principal impediment to the direct determination of species from extracted eggs is the effect of the sediment on the egg morphology.…”

Section: Identification Of Species From Eggs Extracted From Pool Sedimentioning

confidence: 99%

The effects of soils and soil stay on the egg morphology of Neotropical Eulimnadia (Branchiopoda: Limnadiidae)

Rabet¹,

Montero²,

Lacau³

2014

J Limnol

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SEM morphological survey on the egg shell in the italian Anostracans (Crustacea, Branchiopoda)

Cited by 59 publications

References 10 publications

Comparative observations on the cyst shells of seven Artemia strains from China

Comparative observations on the cyst shells of seven Artemia strains from China

Anostracans (Branchiopoda) of Botswana: Morphology, Distribution, Diversity, and Endemicity

The effects of soils and soil stay on the egg morphology of Neotropical Eulimnadia (Branchiopoda: Limnadiidae)

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