SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

A comparative study is made of the three groups (Cyphophthalmi, Laniatores and Palpatores) into which Opilionida are currently subdivided. Methods, principles and terminology, adopted in this paper, correspond with those of parts I and II of the present series of studies in Chelicerata. Special attention is paid to mouthparts and appendages, to opilionid relationships, and to the evolution of chelicerate characters. It is demonstrated that Cyphophthalmi present all the essential opilionid characters, and evidently do not constitute a separate group. It is also demonstrated that Opilionida are not closely related to Actinotrichid or Anactinotrichid mites, but to other groups with a so-called myliosoma (mouthparts associated with coxisternal feeding); these...

Acarological and arachnological notes

Palavras-chave: Opilionida; Chelicerata; Comparative morphology; Classification; Evolution; Phy- logeny.; 42.74.

Ano: 1985

URL: http://www.repository.naturalis.nl/record/317785

A study is made of four subjects in the fields of chelicerate morphology, postembryonic development and relationships, viz., the functional morphology of the legs in Anystis (a fastrunning Actinotrichid mite), the musculature of the gnathosoma of Glyptholaspis confusa (Foà) (an Anactinotrichid mite), the evolution of the chelicerate life-cycle in the case of an irregular number of instars, and the relationships of the chelicerate classes and subclasses.

A structuralist approach in the study of evolution and classification

Palavras-chave: Actinotrichida; Anactinotrichida; Chelicerata; Classification; Fast running; Gnathosoma; Legs; Life-cycle; Locomotion; Morphology; Neostasoid; Neostasoidy; Postembryonic development; Relationships; Stasoid; Stasoidy; 42.74.

Ano: 1986

URL: http://www.repository.naturalis.nl/record/319156

A survey is given of structuralism as a method that can be applied in the study of evolution and classification. The results of a structuralist approach are illustrated by examples from the laws underlying numerical changes, from the laws underlying changes in the chelicerate life-cycle, and from the laws underlying the evolution of the chelicerate appendages. Suggestions are given for the study of the laws underlying the transformation of form, and some notes are made on structuring forces and the early stages of organic evolution. Some concluding remarks are finally made on deep structure, phylogenetic classification and evolution.

Comparative studies in Chelicerata IV. Apatellata, Arachnida, Scorpionida, Xiphosura

Palavras-chave: Appendages; Chelicerata; Classification; Evolution; Increasing complexity; Individual; Laws of form; Life-cycle; Numerical changes; Primordial life; Segmentation; Sexuality; Structuralism; 42.21; 42.70.

Ano: 1985

URL: http://www.repository.naturalis.nl/record/319130

A comparative study is made of four chelicerate classes: Apatellata (Solifugae and Pseudoscorpionida), Arachnida s. str. (both groups of Uropygi, i.e. Holopeltida and Schizomida, Amblypygi and Araneida), Scorpionida and Xiphosura. Methods, principles and terminology, adopted in this paper, correspond with those of parts I -111 of the present series of comparative studies in Chelicerata. Special attention is paid to segmentation of the body, respiratory organs, orifices of coxal glands, mouthparts, and appendages. The evolution of these structures is studied, and the relationships of the chelicerate classes and subclasses are reinvestigated and discussed.

Comparative studies in Chelicerata : I. The Cryptognomae (Ricinulei, Architarbi and Anactinotrichida)

Palavras-chave: Amblypygi; Apatellata; Arachnida; Araneida; Chelicerata; Evolution; Holopeltida; Morphology; Pseudoscorpionida; Schizomida; Scorpionida; Solifugae; Uropygi; Xiphosura.; 42.74.

Ano: 1986

URL: http://www.repository.naturalis.nl/record/317847

A comparative study is made of three groups of Chelicerata: Ricinulei, Architarbi and Anactinotrichid mites. Ricinulid terminology is revised, and a partly new interpretation of Ricinulid structure is given. Models are prepared of the evolution of Cryptognomic characters. Classification of the three groups is based on a cladistic analysis.