Studies on the tine structure of Copepoda Observations on Calanus finmarchicus (Gunnerus)
Electron micrograph studies have been carried out on several body systems of the copepod, Calanus finmarchicus . The mid-gut epithelium possesses a layer of densely packed microvilli; there are two well-developed muscle layers, an inner strongly folded layer and an outer thinner layer, both of smoot...
Published in: | Proceedings of the Royal Society of London. Series B. Biological Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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The Royal Society
1974
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Online Access: | http://dx.doi.org/10.1098/rspb.1974.0026 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1974.0026 |
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crroyalsociety:10.1098/rspb.1974.0026 2024-06-02T08:04:42+00:00 Studies on the tine structure of Copepoda Observations on Calanus finmarchicus (Gunnerus) 1974 http://dx.doi.org/10.1098/rspb.1974.0026 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1974.0026 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Proceedings of the Royal Society of London. Series B. Biological Sciences volume 185, issue 1081, page 409-424 ISSN 0080-4649 2053-9193 journal-article 1974 crroyalsociety https://doi.org/10.1098/rspb.1974.0026 2024-05-07T14:16:17Z Electron micrograph studies have been carried out on several body systems of the copepod, Calanus finmarchicus . The mid-gut epithelium possesses a layer of densely packed microvilli; there are two well-developed muscle layers, an inner strongly folded layer and an outer thinner layer, both of smooth fibres. The body musculature shows the striation typical of skeletal muscle with clear ‘a’ and ‘i’ bands, the latter with a 'z' line. Microtubules run longitudinally through the muscle fibres. The cuticle is divided into an inner zone of nine and an outer zone of seven layers; each is composed of fine lamellae and exhibits a wave-like pattern. A seta has a cuticular wall structure which is essentially similar; the setules are composed of cuticular layers only and lack protoplasmic extensions. The attachment of body muscle to cuticle is by a specialized area analogous to a tendon. Fine tubules from the plasma membrane of the ‘tendon’ become grouped into dense bundles of fibres which are inserted on the cuticle as tono-filaments. The nerve fibres exhibit great variation in diameter and in thickness of the myelin sheath. The developing ovum has a large nucleus, the boundary layer of which shows prominent nuclear pores. The nucleolus is very large. The male germinal epithelium also shows a particularly large ratio of nucleus to cytoplasm. The spermatophore sac wall is intensely secretory, producing droplets which appear to form a thick laminated spermatophore wall. It is suggested that secreted materials of two types in the core substance of the spermatophore arise from the vas deferens. The same materials are present in relatively small amounts in earlier stages of spermatophore development when the sperms are tightly packed together and the spermatophore wall is very thin. Article in Journal/Newspaper Calanus finmarchicus The Royal Society Seta ENVELOPE(9.895,9.895,63.645,63.645) Proceedings of the Royal Society of London. Series B. Biological Sciences 185 1081 409 424 |
institution |
Open Polar |
collection |
The Royal Society |
op_collection_id |
crroyalsociety |
language |
English |
description |
Electron micrograph studies have been carried out on several body systems of the copepod, Calanus finmarchicus . The mid-gut epithelium possesses a layer of densely packed microvilli; there are two well-developed muscle layers, an inner strongly folded layer and an outer thinner layer, both of smooth fibres. The body musculature shows the striation typical of skeletal muscle with clear ‘a’ and ‘i’ bands, the latter with a 'z' line. Microtubules run longitudinally through the muscle fibres. The cuticle is divided into an inner zone of nine and an outer zone of seven layers; each is composed of fine lamellae and exhibits a wave-like pattern. A seta has a cuticular wall structure which is essentially similar; the setules are composed of cuticular layers only and lack protoplasmic extensions. The attachment of body muscle to cuticle is by a specialized area analogous to a tendon. Fine tubules from the plasma membrane of the ‘tendon’ become grouped into dense bundles of fibres which are inserted on the cuticle as tono-filaments. The nerve fibres exhibit great variation in diameter and in thickness of the myelin sheath. The developing ovum has a large nucleus, the boundary layer of which shows prominent nuclear pores. The nucleolus is very large. The male germinal epithelium also shows a particularly large ratio of nucleus to cytoplasm. The spermatophore sac wall is intensely secretory, producing droplets which appear to form a thick laminated spermatophore wall. It is suggested that secreted materials of two types in the core substance of the spermatophore arise from the vas deferens. The same materials are present in relatively small amounts in earlier stages of spermatophore development when the sperms are tightly packed together and the spermatophore wall is very thin. |
format |
Article in Journal/Newspaper |
title |
Studies on the tine structure of Copepoda Observations on Calanus finmarchicus (Gunnerus) |
spellingShingle |
Studies on the tine structure of Copepoda Observations on Calanus finmarchicus (Gunnerus) |
title_short |
Studies on the tine structure of Copepoda Observations on Calanus finmarchicus (Gunnerus) |
title_full |
Studies on the tine structure of Copepoda Observations on Calanus finmarchicus (Gunnerus) |
title_fullStr |
Studies on the tine structure of Copepoda Observations on Calanus finmarchicus (Gunnerus) |
title_full_unstemmed |
Studies on the tine structure of Copepoda Observations on Calanus finmarchicus (Gunnerus) |
title_sort |
studies on the tine structure of copepoda observations on calanus finmarchicus (gunnerus) |
publisher |
The Royal Society |
publishDate |
1974 |
url |
http://dx.doi.org/10.1098/rspb.1974.0026 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1974.0026 |
long_lat |
ENVELOPE(9.895,9.895,63.645,63.645) |
geographic |
Seta |
geographic_facet |
Seta |
genre |
Calanus finmarchicus |
genre_facet |
Calanus finmarchicus |
op_source |
Proceedings of the Royal Society of London. Series B. Biological Sciences volume 185, issue 1081, page 409-424 ISSN 0080-4649 2053-9193 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rspb.1974.0026 |
container_title |
Proceedings of the Royal Society of London. Series B. Biological Sciences |
container_volume |
185 |
container_issue |
1081 |
container_start_page |
409 |
op_container_end_page |
424 |
_version_ |
1800749352845574144 |