Cyst Deposition Behaviour and the Functional Morphology of the Brood Pouch in Streptocephalus Torvicornis (Branchiopoda: Anostraca)

Kraus, Holger; Eder, Erich; Møller, Ole Sten; Werding, Bernd

doi:10.1651/c-2470

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…Representatives of Anostraca possess a ventral brood pouch at the 12th and 13th thoracic segment (char. 48, scored 0) (Rogers, 2002;Kraus et al, 2004). In Notostraca, the cysts are encapsulated in the 11th pair of limbs between an expansion of a subapical lobe, forming a cup, and the exopod, forming the lid (char.…”

Section: Spermiogenesis (Maturation Of Spermatids): (0) Cystic Type Omentioning

confidence: 99%

Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci

2007

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The phylogenetic relationships of branchiopod crustaceans have been in the focus of a number of recent morphological and molecular systematic studies. Although agreeing in some respects, major differences remain. We analyzed molecular sequences and morphological characters for 43 branchiopods and two outgroups. The branchiopod terminals comprise all eight ''orders''. The molecular data include six loci: two nuclear ribosomal genes (18S rRNA, 28S rRNA), two mitochondrial ribosomal genes (12S rRNA, 16S rRNA), one nuclear protein coding gene (elongation factor 1a), and one mitochondrial protein coding gene (cytochrome c oxidase subunit I). A total of 65 morphological characters were analyzed dealing with different aspects of branchiopod morphology, including internal anatomy and larval characters. The morphological analysis resulted in a monophyletic Phyllopoda, with Notostraca as the sister group to the remaining taxa supporting the Diplostraca concept (''Conchostraca'' + Cladocera). ''Conchostraca'' is not supported but Cyclestheria hislopi is the sister group to Cladocera (constituting together Cladoceromorpha) and Spinicaudata is closer to Cladoceromorpha than to Laevicaudata. Cladocera is supported as monophyletic. The combined analysis under equal weighting gave results in some respects similar to the morphological analysis. Within Phyllopoda, Cladocera, Cladoceromorpha and Spinicaudata + Cladoceromorpha are monophyletic. The combined analysis is different from the morphological analysis with respect to the position of Notostraca and Laevicaudata. Here, Laevicaudata is the sister group to the remaining Phyllopoda and Notostraca is sister group to Spinicaudata and Cladoceromorpha. A sensitivity analysis using 20 different parameter sets (different insertion-deletion [indel] ⁄ substitution and transversion ⁄ transition ratios) show the monophyly of Anostraca, Notostraca, Laevicaudata, Spinicaudata, Cladoceromorpha, Cladocera, and within Cladocera, of Onychopoda and Gymnomera under all or almost all (i.e., 19 of 20) parameter sets. Analyses with an indel-to-transversion ratio up to 2 result in monophyletic Phyllopoda, with Laevicaudata as sister group to the remaining Phyllopoda and with Spinicaudata and Cladoceromorpha as sister groups. Almost all analyses (including those with higher indel weights) result in the same topology when only ingroup taxa are considered.Ó The Willi Hennig Society 2007.Branchiopoda comprise approximately 1180 described species of mainly freshwater dwelling crustaceans (Adamowicz and Purvis, 2005). It includes taxa with a general, archaic morphology very similar to that of some Cambrian and Devonian crustacean fossils (Anostraca, Notostraca, Spinicaudata), as well as taxa that are highly specialized for predatory, scraping, parasitism, and advanced filtration such as the water fleas (Scourfield

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Section: Spermiogenesis (Maturation Of Spermatids): (0) Cystic Type Omentioning

confidence: 99%

Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci

2007

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“…At the opposite, the density of B. media resting eggs is low, probably because of a reduced fecundity and the globular shape of females' ovisacs, which release their eggs in the water column, thus facilitating their dispersion. Kraus et al (2004) were the first authors to demonstrate how females of Streptocephalus torvicornis (Waga, 1842) introduce their tubular ovisac into the ground to release their eggs. Vanschoenwinkel et al (2010) have shown the role of plant cover in protecting the resting egg bank, which acts as a real nursery.…”

Section: Discussionmentioning

confidence: 99%

Resting eggs bank and their hatching pattern in two co-occuring anostracans Phallocryptus spinosus (Milne-Edwards, 1840) and Branchinectella media (Schmankewitsch, 1873) (Crustacea) from saline lakes of the Aurès region (Northeastern Algeria)

Rais,

Amarouayache,

Rochon

2023

Preprint

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Phallocryptus spinosus (Milne-Edwards, 1840) and Branchinectella media (Schmankewitsch, 1873) are two anostracan species co-occurring in several saline lakes of the eastern steppic zone of Algeria. Both species produce resting eggs to persist in their temporary and unstable habitats, constituting a resting eggs bank. B. media has a restricted distribution worldwide and it is known to prefer cold temperatures (16 °C max). Resting egg banks and hatching patterns of both species have been assessed in seven saline lakes. Results showed that densities of P. spinosus resting eggs were always higher than those of B. media, whatever the lake (F = 4.66, P = 0.0005). They range between 93000 ± 75 and 1495000 ± 366.5 resting eggs.m-2 for P. spinosus, and between 670 ± 30 and 365000 ± 268 resting eggs.m-2 for B. media. Hatching percentages of eggs incubated at temperatures of 16 °C and 22 °C, and salinities of 0 and 5 psu, showed that 16 °C and 5 psu was the most suitable combination for B. media, where 38.88 ± 1.93% of eggs hatched under these conditions. For P. spinosus, 81.11 ± 1.92% of eggs hatched at 22 °C and 5 psu. Resting eggs diameters measurements of both species as well as scanning electron micrographs of B. media are provided.

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“…Anostracans inhabit ephemeral ponds that normally dry out for part of the year. Streptocephalus species oviposit, injecting their eggs into the substrate (Kraus, Eder, Moller & Werding ). But Branchinella are not known to do this.…”

Section: Discussionmentioning

confidence: 99%

Optimal egg viability storage conditions in two commercial fairy shrimps (Crustacea: Branchiopoda: Anostraca) from Thailand

Thaimuangphol

Sanoamuang

2017

Aquac Res

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Optimal egg viability storage conditions for two commercial fairy shrimps, Branchinella thailandensis and Streptocephalus sirindhornae, were investigated. Eggs for each treatment were kept under eight different conditions at four different temperatures for 24 months. Every 2 months, representative eggs were hatched to evaluate hatching percentages. Low temperature and oxygen, darkness and dry conditions significantly influenced egg hatchability of both species. Undehydrated eggs hatchability in all conditions ranged from 0 to 10% in S. sirindhornae and 0 to 20% in B. thailandensis. Hatching percentages of B. thailandensis were higher than those of S. sirindhornae. Hatchability under all experimental regimes continuously decreased over time, except for dry eggs stored at À18°C in darkanoxic conditions. Hatchability was markedly delayed in both species over time. We demonstrate that both species' eggs can be stored at À18°C at least for 24 months with high hatchability in B. thailandensis (80%) and S. sirindhornae (60%) under dry, dark, anoxic conditions.

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Cyst Deposition Behaviour and the Functional Morphology of the Brood Pouch in Streptocephalus Torvicornis (Branchiopoda: Anostraca)

Cited by 10 publications

References 10 publications

Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci

Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci

Resting eggs bank and their hatching pattern in two co-occuring anostracans Phallocryptus spinosus (Milne-Edwards, 1840) and Branchinectella media (Schmankewitsch, 1873) (Crustacea) from saline lakes of the Aurès region (Northeastern Algeria)

Optimal egg viability storage conditions in two commercial fairy shrimps (Crustacea: Branchiopoda: Anostraca) from Thailand

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