Review of Colombian Conchostraca (Crustacea) — ecological aspects and life cycles — family Cyclestheriidae

Roessler, Ewald W.

doi:10.1007/978-94-011-0291-9_10

Cited by 11 publications

(32 citation statements)

References 3 publications

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“…derived from the carapace with a similar function to the ephippium, but its homology is ambiguous with respect to the ephippia of anomopods (Roessler 1995). Owing to the paucity of traditional morphological characters for taxa Proc.…”

Section: Discussion (A) Evolution Of Thoracic Limb Specializationmentioning

confidence: 99%

Structural rRNA characters support monophyly of raptorial limbs and paraphyly of limb specialization in water fleas

Swain

Taylor

2003

Proc. R. Soc. Lond. B

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The evolutionary success of arthropods has been attributed partly to the diversity of their limb morphologies. Large morphological diversity and increased specialization are observed in water flea (Cladocera) limbs, but it is unclear whether the increased limb specialization in different cladoceran orders is the result of shared ancestry or parallel evolution. We inferred a robust among-order cladoceran phylogeny using small-subunit and large-subunit rRNA nuclear gene sequences, signature sequence regions, novel stemloops and secondary structure morphometrics to assess the phylogenetic distribution of limb specialization. The sequence-based and structural rRNA morphometric phylogenies were congruent and suggested monophyly of orders with raptorial limbs, but paraphyly of orders with reduced numbers of specialized limbs. These results highlight the utility of complex molecular structural characters in resolving ancient rapid radiations.

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Section: Discussion (A) Evolution Of Thoracic Limb Specializationmentioning

confidence: 99%

Structural rRNA characters support monophyly of raptorial limbs and paraphyly of limb specialization in water fleas

Swain

Taylor

2003

Proc. R. Soc. Lond. B

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“…The same was shown to apply to the parthenogenetic part of the life cycle in certain Cladocera, for which the term pseudo-direct development was coined (see Fritsch et al 2013). Roessler (1995) provided the only documentation so far of the gamogenetic part of the life cycle in Cyclestheria. In Spinicaudata, a free-swimming nauplius larva with a complete naupliar nervous system hatch and later development is gradual with a strong anterior-posterior gradient.…”

Section: Introductionmentioning

confidence: 88%

“…In parthenogenetic Cyclestheria, external and internal structures develop more synchronously before the hatching of nonswimming embryo-like larvae. Parthenogenetic females in Cyclestheria start to produce males to copulate with females upon release from the mother's carapace (Roessler 1995). After hatching a more synchronous anterior-posterior differentiation appears.…”

Section: Introductionmentioning

confidence: 99%

“…There is no nauplius stage, i.e., the presence of only naupliar appendages, nor any sign of an advanced naupliar nervous system. After fertilization, 4-8 gamogenetic eggs are deposited in what will later become the ephippium, a specialized chitinous region in the dorsal area of the carapace of the mother made up of the two carapace valves (see Roessler 1995). Roessler (1995) provided the only documentation so far of the gamogenetic part of the life cycle in Cyclestheria.…”

Section: Introductionmentioning

confidence: 99%

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How the cladoceran heterogonic life cycle evolved—insights from gamogenetic reproduction and direct development in Cyclestherida

Fritsch

Richter

2015

Evolution and Development

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Here we document the early gamogenetic development of Cyclestherida, including a characterization of the nervous system. Resting eggs in Cyclestheria are protected by an ephippium, built by the major part of the carapace. The first stages of development are enclosed in an outer chorion and an inner vitelline membrane. After shedding of the chorion, the vitelline membrane inflates and later stages are free-floating within the vitelline membrane. Only the juveniles are released from the vitelline membrane. Developmental stages of the gamogenetic direct development and of the parthenogenetic pseudo-direct development are remarkably similar in Cyclestheria, both regarding external and nervous system development. Because of this high degree of correspondence, as well as the important differences to the anamorphic development in Spinicaudata, we suggest that the developmental stages from the gamogenetic life cycle evolved directly from the parthenogenetic life cycle. This implies that resting egg development in Cladoceromorpha does not correspond directly to the resting egg development in large branchiopods. This leads us to the conclusion that the entire heterogonous life cycle in Cladoceromorpha probably evolved anew.

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“…Tasch (1969) enfatizou que conchostráceos fósseis seriam sempre indicativos de corpos d'água temporários. Contudo, alguns conchostráceos modernos (e.g., Cyclestheria) vivem em ambientes límnicos perenes (Roessler, 1995;Padhye et al, 2011) e diversos conchostráceos fósseis evidenciam condições aquáticas amplas e estáveis (Petzold e Lane, 1988;Rohn, 1994;Rohn et al, 2005). Os conchostráceos na sucessão do afloramento São Luís, e particularmente as escamas de peixes, sugerem que o corpo d'água que preservou esta tafocenose teve uma duração relativamente longa.…”

Section: Considerações Paleoecológicas E Paleoambientaisunclassified

Conchostráceos como evidência de níveis jurássicos na Formação Caturrita, Faxinal do Soturno, Rio Grande do Sul, Brasil

Rohn

Dutra

Cabral

2014

Geol. USP, Sér. cient.

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Disponível on-line no endereço www.igc.usp.br/geologiausp -3 - ResumoEste trabalho enfoca os primeiros conchostráceos (Crustacea, Spinicaudata) encontrados no afloramento São Luís (Formação Caturrita, Grupo Rosário do Sul), em Faxinal do Soturno, Rio Grande do Sul (29º 33' 29,09"S, 53º 26' 54"W). Vertebrados e vegetais fósseis identificados no mesmo afloramento sugerem idades conflitantes, respectivamente, final do Triássico e início do Jurássico. Pistas de dinossauros recentemente descobertas na parte superior do afloramento acirram a polêmica. Deste modo, os conchostrá-ceos constituem importantes elementos adicionais nesta discussão. Alguns compartilham muitos caracteres com Carapacestheria disgregaris (Tasch) Shen (Eosestheriidae) do Grupo Ferrar, Jurássico Inferior-Médio das Montanhas Transantárticas. Contudo, diferenças em detalhes da ornamentação levaram à proposta de um novo gênero e de uma nova espécie, Nothocarapacestheria soturnensis, e à interpretação de uma relação filogenética próxima à espécie antártica. Outros exemplares da assembleia guardam semelhança com Australestheria corneti (Marliére) Chen (Fushunograptidae) do Jurássico Médio do Zaire. Em conjunto, os conchostráceos apoiam a idade jurássica e corroboram os dados da flora de Bennettitales registrada nos mesmos níveis do afloramento. Por outro lado, a idade triássica apontada pelos tetrápodos não pode ser descartada por sua própria posição estratigráfica mais inferior no afloramento São Luís. Do mesmo modo, a presente discussão cronoestratigráfica não diz respeito às outras ocorrências da Formação Caturrita, especialmente porque há dificuldades nas correlações, tanto pela falta de suporte paleontológico, como pelos inúmeros falhamentos durante a sedimentação mesozoica na parte sul da Bacia do Paraná.Palavras-chave: Spinicaudata; Mesozoico; Grupo Rosário do Sul; Bacia do Paraná; Paleozoologia; Paleolimnologia. AbstractThis paper focus on the first conchostracans (Crustacea, Spinicaudata) found at the São Luís outcrop (Caturrita Formation, Rosário do Sul Group), in Faxinal do Soturno, Rio Grande do Sul State, Brazil (29º 33' 29.09"S, 53º 26' 54"W). Fossil vertebrates and plants identified at this outcrop suggest conflicting ages, respectively Late Triassic and Early Jurassic. Dinosaur tracks recently found at the upper part of the outcrop enhance these age problems. In this way, the conchostracans constitute important additional elements in this discussion. Some specimens share many characteristics with Carapacestheria disgregaris (Tasch) Shen (Eosestheriidae) of the Ferrar Group, Lower-Mid Jurassic of the Transantartic Mountains. But differences in the ornamentation details led to the proposal of a new genus and a new species, Nothocarapacestheria soturnensis, and to the interpretation of a close phylogenetic relationship with the Antarctic species. Other samples in this assemblage are similar to Australestheria corneti (Marliére) Chen (Fushunograptidae) of the Middle Jurassic from Zaire. Together, these conchostracans substantiate a Jurassic...

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Review of Colombian Conchostraca (Crustacea) — ecological aspects and life cycles — family Cyclestheriidae

Cited by 11 publications

References 3 publications

Structural rRNA characters support monophyly of raptorial limbs and paraphyly of limb specialization in water fleas

Structural rRNA characters support monophyly of raptorial limbs and paraphyly of limb specialization in water fleas

How the cladoceran heterogonic life cycle evolved—insights from gamogenetic reproduction and direct development in Cyclestherida

Conchostráceos como evidência de níveis jurássicos na Formação Caturrita, Faxinal do Soturno, Rio Grande do Sul, Brasil

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