Ultrastructural studies of egg envelopes in harvestmen (Chelicerata, Opiliones)

Witaliński, Wojciech; Żuwała, Krystyna

doi:10.1080/01651269.1981.10553421

Cited by 24 publications

(8 citation statements)

References 16 publications

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“…In the investigated stonefly ovaries, secretion of eggshells starts relatively early. Similarly, early deposition of egg envelopes has been described in myriapods, crustaceans and arachnids (Nørrevang 1972; Herbaut 1974; Witaliński and Żuwała 1981; Witaliński 1993; Ikuta et al . 1997).…”

Section: Discussionmentioning

confidence: 63%

Structure of the ovaries in larvae and mature females of euholognathan stoneflies (Plecoptera)

Rosciszewska

2001

Acta Zoologica

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The morphology of ovaries, oviducts and egg capsules in four species of euholognathan stoneflies was investigated. The characteristic features found were as follows: (i) numerous, long ovarioles, that open individually to the extensively folded, lateral oviducts; (ii) a thin, morphologically undifferentiated chorion; (iii) a thick gelatinous layer (extrachorion) which acts as an adhesive layer fixing the eggs to the substrate. Additionally, in the larval ovariole of Leuctra sp. the terminal filament anlage and clusters of germ cells have been found. These observations are in agreement with the classification of stonefly ovaries as primary (true) panoistic.

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Section: Discussionmentioning

confidence: 63%

Structure of the ovaries in larvae and mature females of euholognathan stoneflies (Plecoptera)

Rosciszewska

2001

Acta Zoologica

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“…barbarus, seems to support this supposition. In harvestmen (Opiliones), the vitelline envelope lacks channels but has a spongy structure and is easily permeable (Witalinski and Zuwala, 1981). In the mite Hafenrefferia gilvipes (Oribatida), the vitelline envelope is also devoid of perforations but has a granular rather than compact structure (Witalinski, 1986).…”

Section: Discussionmentioning

confidence: 99%

Egg-Shells in mites: Cytological aspects of vitelline envelope and chorion formation inPergamasus barbarusberlese (Gamasida, Pergamasidae)

Witaliński

1987

International Journal of Acarology

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Transformations leading to the appearance of the perivitelline space and vitelline envelope, the structure of the vitelline envelope, and the structure and origin of the chorion in Pergamasus barbarus were the subjects of ultrastructural studies. The follicular cells participate in the perivitelline space formation. The material of the vitelline envelope is secreted by exocytosis from the oocyte at the beginning of vitellogenesis. Later, the vitelline envelope is transformed into endochorion protecting the embryo from mechanical damage. Exochorion is secreted onto the endochorion during egg deposition. Double role of exochorion as plastron and as a structure protecting the embryo from dessication is suggested.

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“…These segmental adhesions are composed of a substance, which is different from the spherical scaffolds that maintains its shape for a long time. According to Witaliński and Žuwała (1981) and Makover et al (2019), the oviposition uid contains mucus and low-molecular-weight proteins. The lowmolecular-weight proteins indicates the basic spherical units of CM, while mucus forms the adhesion between the units.…”

Section: Discussionmentioning

confidence: 99%

“…Hadley (1978) con rmed the presence of a lipid layer impermeable to water on the egg surface. Witaliński and Žuwała (1981) suggested that the mucus-containing oviposition uid coats the chorion, causing aggregation of eggs. Conti et al (2015) suggested that the aggregation of the eggs restricts their dehydration, as they become tightly attached to each other.…”

Section: Introductionmentioning

confidence: 99%

Fine Structural Characteristics of the Chorionic Microspheres on the Egg Surface of the Orb Web Spider Trichonephila clavata

LEE

Moon

2023

Preprint

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The eggs laid by the orb web spider Trichonephila clavata must overwinter in very harsh weather conditions before hatching, but there does not seem to be any protection like a compact silk case covering the entire eggmass. Instead, the surface of the eggmass is completely coated with a milky coating called chorionic microspheres (CM). Therefore, we investigated the fine structural characteristics of CM to demonstrate the role of their ecological importance. Although the CM exhibits an uneven size distribution in outer eggmass, the chorionic surface is evenly covered with a single layer with a diameter of 2.3 µm approximately. The surface structure of aggregated CM shows short papillary projections demonstrating segmental adhesion of mucous components. CM is insoluble in water but partially soluble in absolute ethanol, and its spherical structure is completely decomposed by HFIP, a strong organic solvent. Since our fine structural observations clearly show that CM is not derived from vitellogenic or choriogenetic processes, the CM adhesive coatings during ovipositional process appears to be equivalent to cocoon silk for various protective functions in silken eggcase.

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Ultrastructural studies of egg envelopes in harvestmen (Chelicerata, Opiliones)

Cited by 24 publications

References 16 publications

Structure of the ovaries in larvae and mature females of euholognathan stoneflies (Plecoptera)

Structure of the ovaries in larvae and mature females of euholognathan stoneflies (Plecoptera)

Egg-Shells in mites: Cytological aspects of vitelline envelope and chorion formation inPergamasus barbarusberlese (Gamasida, Pergamasidae)

Fine Structural Characteristics of the Chorionic Microspheres on the Egg Surface of the Orb Web Spider Trichonephila clavata

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