Derivation of the reduced life cycle of Thecoscyphus zibrowii Werner, 1984 (Cnidaria, Scyphozoa)
The species Thecoscyphus zibrowii Werner, 1984 has an exceptional life cycle, which lacks a medusa stage but develops an extraordinary structure (egg sac) for reproduction. Investigation of the life cycle, as well as anatomical and histological studies of the different developmental stages of T. zib...
Gespeichert in:
| Veröffentlicht in: | Marine biology 2009-10, Vol.156 (11), p.2331-2341 |
|---|---|
| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 2341 |
|---|---|
| container_issue | 11 |
| container_start_page | 2331 |
| container_title | Marine biology |
| container_volume | 156 |
| creator | Sötje, Ilka Jarms, Gerhard |
| description | The species
Thecoscyphus zibrowii
Werner, 1984 has an exceptional life cycle, which lacks a medusa stage but develops an extraordinary structure (egg sac) for reproduction. Investigation of the life cycle, as well as anatomical and histological studies of the different developmental stages of
T. zibrowii
were performed to provide evidence for a possible homology of the egg sac with the medusa stage and to determine whether the reduced metagenesis of
T. zibrowii
is derived from strobilation. The egg sac showed several characteristics, which were compared to those of coronate medusae. The ectodermis of the egg sac had a plate-like appearance and was completely ciliated as is typical for coronate medusae. The number and the location of the gonads were similar to those of coronate medusae. The cnidocysts were significantly larger in the egg sac than in the polyp. A size difference of cnidocysts in the medusa and the polyp stage is known for several Coronatae. Characteristics of egg sac formation were compared to characteristics of strobilation. The formation of the early operculum was similar in
T. zibrowii
and
N. eumedusoides
. The constriction of egg sac and strobila occurred in the same mode and the gastric cavities of two egg sacs stayed in contact in a similar fashion to the gastric cavities of the strobila discs. The developmental zones of cnidoblasts of the egg sac and polyp were separated during the formation of the egg sac which showed a similar developmental gradient to a strobila. The existence of all of these consistent characteristics makes it very likely that the egg sac structure was homologous to a medusa. The species
T. zibrowii
would therefore be derived from a metagenetic ancestor. This species has reduced the medusa generation to the greatest extent within the Nausithoidae and has demonstrated thus far the endpoint of a regressive evolution of the medusa generation. |
| doi_str_mv | 10.1007/s00227-009-1261-7 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_journals_208064438</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>1872781971</sourcerecordid><originalsourceid>FETCH-LOGICAL-c345t-e5e4ef3c3e77013c839e07294458ce9578cfea46038e9cac60205894e3d8df7f3</originalsourceid><addsrcrecordid>eNp1kEtLAzEUhYMoWKs_wF0QBIWO5jWTZCn1CQUXVlzGmLmxKXVSk6nS_nqntOjK1eVyvnPu5SB0TMkFJUReZkIYkwUhuqCsooXcQT0qOCuo1HwX9Tq5LDit2D46yHlKul0y3kOv15DCl21DbHD0uJ0ATlAvHNR4Fjxgt3QzWCvjCbiY3XI-WWS8Cm8pfoeAXyA1kAaYaiXw2bAJtU3BDvDTGoyraM8P0Z63swxH29lHz7c34-F9MXq8exhejQrHRdkWUIIAzx0HKQnlTnENRDItRKkc6FIq58GKinAF2llXEUZKpQXwWtVeet5HJ5vceYqfC8itmcZFarqThhFFKiG46iC6gVyKOSfwZp7Ch01LQ4lZ92g2PZquR7Pu0cjOc7oNttnZmU-2cSH_GhnVTKmy7Di24XInNe-Q_h74P_wHiAiBBw</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>208064438</pqid></control><display><type>article</type><title>Derivation of the reduced life cycle of Thecoscyphus zibrowii Werner, 1984 (Cnidaria, Scyphozoa)</title><source>Springer Nature - Complete Springer Journals</source><creator>Sötje, Ilka ; Jarms, Gerhard</creator><creatorcontrib>Sötje, Ilka ; Jarms, Gerhard</creatorcontrib><description>The species
Thecoscyphus zibrowii
Werner, 1984 has an exceptional life cycle, which lacks a medusa stage but develops an extraordinary structure (egg sac) for reproduction. Investigation of the life cycle, as well as anatomical and histological studies of the different developmental stages of
T. zibrowii
were performed to provide evidence for a possible homology of the egg sac with the medusa stage and to determine whether the reduced metagenesis of
T. zibrowii
is derived from strobilation. The egg sac showed several characteristics, which were compared to those of coronate medusae. The ectodermis of the egg sac had a plate-like appearance and was completely ciliated as is typical for coronate medusae. The number and the location of the gonads were similar to those of coronate medusae. The cnidocysts were significantly larger in the egg sac than in the polyp. A size difference of cnidocysts in the medusa and the polyp stage is known for several Coronatae. Characteristics of egg sac formation were compared to characteristics of strobilation. The formation of the early operculum was similar in
T. zibrowii
and
N. eumedusoides
. The constriction of egg sac and strobila occurred in the same mode and the gastric cavities of two egg sacs stayed in contact in a similar fashion to the gastric cavities of the strobila discs. The developmental zones of cnidoblasts of the egg sac and polyp were separated during the formation of the egg sac which showed a similar developmental gradient to a strobila. The existence of all of these consistent characteristics makes it very likely that the egg sac structure was homologous to a medusa. The species
T. zibrowii
would therefore be derived from a metagenetic ancestor. This species has reduced the medusa generation to the greatest extent within the Nausithoidae and has demonstrated thus far the endpoint of a regressive evolution of the medusa generation.</description><identifier>ISSN: 0025-3162</identifier><identifier>EISSN: 1432-1793</identifier><identifier>DOI: 10.1007/s00227-009-1261-7</identifier><identifier>CODEN: MBIOAJ</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer-Verlag</publisher><subject>Animal and plant ecology ; Animal, plant and microbial ecology ; Biological and medical sciences ; Biomedical and Life Sciences ; Cells ; Cnidaria. Ctenaria ; Developmental stages ; Freshwater & Marine Ecology ; Fundamental and applied biological sciences. Psychology ; Generations ; Gonads ; Invertebrates ; Life cycles ; Life Sciences ; Marine & Freshwater Sciences ; Marine biology ; Microbiology ; Oceanography ; Original Paper ; Sea water ecosystems ; Synecology ; Zoology</subject><ispartof>Marine biology, 2009-10, Vol.156 (11), p.2331-2341</ispartof><rights>Springer-Verlag 2009</rights><rights>2009 INIST-CNRS</rights><rights>Copyright Springer Science & Business Media Oct 2009</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c345t-e5e4ef3c3e77013c839e07294458ce9578cfea46038e9cac60205894e3d8df7f3</citedby><cites>FETCH-LOGICAL-c345t-e5e4ef3c3e77013c839e07294458ce9578cfea46038e9cac60205894e3d8df7f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00227-009-1261-7$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00227-009-1261-7$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27903,27904,41467,42536,51297</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21928855$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Sötje, Ilka</creatorcontrib><creatorcontrib>Jarms, Gerhard</creatorcontrib><title>Derivation of the reduced life cycle of Thecoscyphus zibrowii Werner, 1984 (Cnidaria, Scyphozoa)</title><title>Marine biology</title><addtitle>Mar Biol</addtitle><description>The species
Thecoscyphus zibrowii
Werner, 1984 has an exceptional life cycle, which lacks a medusa stage but develops an extraordinary structure (egg sac) for reproduction. Investigation of the life cycle, as well as anatomical and histological studies of the different developmental stages of
T. zibrowii
were performed to provide evidence for a possible homology of the egg sac with the medusa stage and to determine whether the reduced metagenesis of
T. zibrowii
is derived from strobilation. The egg sac showed several characteristics, which were compared to those of coronate medusae. The ectodermis of the egg sac had a plate-like appearance and was completely ciliated as is typical for coronate medusae. The number and the location of the gonads were similar to those of coronate medusae. The cnidocysts were significantly larger in the egg sac than in the polyp. A size difference of cnidocysts in the medusa and the polyp stage is known for several Coronatae. Characteristics of egg sac formation were compared to characteristics of strobilation. The formation of the early operculum was similar in
T. zibrowii
and
N. eumedusoides
. The constriction of egg sac and strobila occurred in the same mode and the gastric cavities of two egg sacs stayed in contact in a similar fashion to the gastric cavities of the strobila discs. The developmental zones of cnidoblasts of the egg sac and polyp were separated during the formation of the egg sac which showed a similar developmental gradient to a strobila. The existence of all of these consistent characteristics makes it very likely that the egg sac structure was homologous to a medusa. The species
T. zibrowii
would therefore be derived from a metagenetic ancestor. This species has reduced the medusa generation to the greatest extent within the Nausithoidae and has demonstrated thus far the endpoint of a regressive evolution of the medusa generation.</description><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Biological and medical sciences</subject><subject>Biomedical and Life Sciences</subject><subject>Cells</subject><subject>Cnidaria. Ctenaria</subject><subject>Developmental stages</subject><subject>Freshwater & Marine Ecology</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Generations</subject><subject>Gonads</subject><subject>Invertebrates</subject><subject>Life cycles</subject><subject>Life Sciences</subject><subject>Marine & Freshwater Sciences</subject><subject>Marine biology</subject><subject>Microbiology</subject><subject>Oceanography</subject><subject>Original Paper</subject><subject>Sea water ecosystems</subject><subject>Synecology</subject><subject>Zoology</subject><issn>0025-3162</issn><issn>1432-1793</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp1kEtLAzEUhYMoWKs_wF0QBIWO5jWTZCn1CQUXVlzGmLmxKXVSk6nS_nqntOjK1eVyvnPu5SB0TMkFJUReZkIYkwUhuqCsooXcQT0qOCuo1HwX9Tq5LDit2D46yHlKul0y3kOv15DCl21DbHD0uJ0ATlAvHNR4Fjxgt3QzWCvjCbiY3XI-WWS8Cm8pfoeAXyA1kAaYaiXw2bAJtU3BDvDTGoyraM8P0Z63swxH29lHz7c34-F9MXq8exhejQrHRdkWUIIAzx0HKQnlTnENRDItRKkc6FIq58GKinAF2llXEUZKpQXwWtVeet5HJ5vceYqfC8itmcZFarqThhFFKiG46iC6gVyKOSfwZp7Ch01LQ4lZ92g2PZquR7Pu0cjOc7oNttnZmU-2cSH_GhnVTKmy7Di24XInNe-Q_h74P_wHiAiBBw</recordid><startdate>20091001</startdate><enddate>20091001</enddate><creator>Sötje, Ilka</creator><creator>Jarms, Gerhard</creator><general>Springer-Verlag</general><general>Springer</general><general>Springer Nature B.V</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QG</scope><scope>7SN</scope><scope>7ST</scope><scope>7TN</scope><scope>7U7</scope><scope>7XB</scope><scope>88A</scope><scope>8AO</scope><scope>8FD</scope><scope>8FE</scope><scope>8FH</scope><scope>8FK</scope><scope>8G5</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H95</scope><scope>HCIFZ</scope><scope>L.G</scope><scope>LK8</scope><scope>M2O</scope><scope>M7N</scope><scope>M7P</scope><scope>MBDVC</scope><scope>P64</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><scope>R05</scope><scope>RC3</scope><scope>SOI</scope></search><sort><creationdate>20091001</creationdate><title>Derivation of the reduced life cycle of Thecoscyphus zibrowii Werner, 1984 (Cnidaria, Scyphozoa)</title><author>Sötje, Ilka ; Jarms, Gerhard</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c345t-e5e4ef3c3e77013c839e07294458ce9578cfea46038e9cac60205894e3d8df7f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Animal and plant ecology</topic><topic>Animal, plant and microbial ecology</topic><topic>Biological and medical sciences</topic><topic>Biomedical and Life Sciences</topic><topic>Cells</topic><topic>Cnidaria. Ctenaria</topic><topic>Developmental stages</topic><topic>Freshwater & Marine Ecology</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Generations</topic><topic>Gonads</topic><topic>Invertebrates</topic><topic>Life cycles</topic><topic>Life Sciences</topic><topic>Marine & Freshwater Sciences</topic><topic>Marine biology</topic><topic>Microbiology</topic><topic>Oceanography</topic><topic>Original Paper</topic><topic>Sea water ecosystems</topic><topic>Synecology</topic><topic>Zoology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sötje, Ilka</creatorcontrib><creatorcontrib>Jarms, Gerhard</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Animal Behavior Abstracts</collection><collection>Ecology Abstracts</collection><collection>Environment Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Toxicology Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Biology Database (Alumni Edition)</collection><collection>ProQuest Pharma Collection</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>Biological Science Collection</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>ProQuest Biological Science Collection</collection><collection>Research Library</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biological Science Database</collection><collection>Research Library (Corporate)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central Basic</collection><collection>University of Michigan</collection><collection>Genetics Abstracts</collection><collection>Environment Abstracts</collection><jtitle>Marine biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sötje, Ilka</au><au>Jarms, Gerhard</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Derivation of the reduced life cycle of Thecoscyphus zibrowii Werner, 1984 (Cnidaria, Scyphozoa)</atitle><jtitle>Marine biology</jtitle><stitle>Mar Biol</stitle><date>2009-10-01</date><risdate>2009</risdate><volume>156</volume><issue>11</issue><spage>2331</spage><epage>2341</epage><pages>2331-2341</pages><issn>0025-3162</issn><eissn>1432-1793</eissn><coden>MBIOAJ</coden><abstract>The species
Thecoscyphus zibrowii
Werner, 1984 has an exceptional life cycle, which lacks a medusa stage but develops an extraordinary structure (egg sac) for reproduction. Investigation of the life cycle, as well as anatomical and histological studies of the different developmental stages of
T. zibrowii
were performed to provide evidence for a possible homology of the egg sac with the medusa stage and to determine whether the reduced metagenesis of
T. zibrowii
is derived from strobilation. The egg sac showed several characteristics, which were compared to those of coronate medusae. The ectodermis of the egg sac had a plate-like appearance and was completely ciliated as is typical for coronate medusae. The number and the location of the gonads were similar to those of coronate medusae. The cnidocysts were significantly larger in the egg sac than in the polyp. A size difference of cnidocysts in the medusa and the polyp stage is known for several Coronatae. Characteristics of egg sac formation were compared to characteristics of strobilation. The formation of the early operculum was similar in
T. zibrowii
and
N. eumedusoides
. The constriction of egg sac and strobila occurred in the same mode and the gastric cavities of two egg sacs stayed in contact in a similar fashion to the gastric cavities of the strobila discs. The developmental zones of cnidoblasts of the egg sac and polyp were separated during the formation of the egg sac which showed a similar developmental gradient to a strobila. The existence of all of these consistent characteristics makes it very likely that the egg sac structure was homologous to a medusa. The species
T. zibrowii
would therefore be derived from a metagenetic ancestor. This species has reduced the medusa generation to the greatest extent within the Nausithoidae and has demonstrated thus far the endpoint of a regressive evolution of the medusa generation.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><doi>10.1007/s00227-009-1261-7</doi><tpages>11</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0025-3162 |
| ispartof | Marine biology, 2009-10, Vol.156 (11), p.2331-2341 |
| issn | 0025-3162 1432-1793 |
| language | eng |
| recordid | cdi_proquest_journals_208064438 |
| source | Springer Nature - Complete Springer Journals |
| subjects | Animal and plant ecology Animal, plant and microbial ecology Biological and medical sciences Biomedical and Life Sciences Cells Cnidaria. Ctenaria Developmental stages Freshwater & Marine Ecology Fundamental and applied biological sciences. Psychology Generations Gonads Invertebrates Life cycles Life Sciences Marine & Freshwater Sciences Marine biology Microbiology Oceanography Original Paper Sea water ecosystems Synecology Zoology |
| title | Derivation of the reduced life cycle of Thecoscyphus zibrowii Werner, 1984 (Cnidaria, Scyphozoa) |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-23T16%3A31%3A05IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Derivation%20of%20the%20reduced%20life%20cycle%20of%20Thecoscyphus%20zibrowii%20Werner,%201984%20(Cnidaria,%20Scyphozoa)&rft.jtitle=Marine%20biology&rft.au=S%C3%B6tje,%20Ilka&rft.date=2009-10-01&rft.volume=156&rft.issue=11&rft.spage=2331&rft.epage=2341&rft.pages=2331-2341&rft.issn=0025-3162&rft.eissn=1432-1793&rft.coden=MBIOAJ&rft_id=info:doi/10.1007/s00227-009-1261-7&rft_dat=%3Cproquest_cross%3E1872781971%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=208064438&rft_id=info:pmid/&rfr_iscdi=true |