{"doi":"10.1080/07924259.2009.9652302","title":"Ultrastructure of hull formation during oogenesis in<i>Rhyssoplax tulipa</i>(=<i>Chiton tulipa</i>) (Chitonidae: Chitoninae)","abstract":null,"journal":"Invertebrate Reproduction &amp; Development","year":2009,"id":685649,"datarank":0.37273599746820013,"base_score":2.4849066497880004,"endowment":2.4849066497880004,"self_citation_contribution":0.37273599746820013,"citation_network_contribution":0.0,"self_endowment_contribution":0.37273599746820013,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":11,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":1791343,"name":"ARKADIY REUNOV","orcid":null,"position":1,"is_corresponding":false},{"id":1791341,"name":"JOHN BUCKLAND-NICKS","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Ultrastructure of hull formation during oogenesis in<i>Rhyssoplax tulipa</i>(=<i>Chiton tulipa</i>) (Chitonidae: Chitoninae)","abstract":"Egg hull formation is described in detail for the first time in Rhyssoplax tulipa from South Africa. Although previous descriptions of hull formation in chitons provide some basis for comparison, the mechanisms we have discovered are totally different. The process begins with the release of clear vacuoles from the oocyte into the intercellular space, which separates it from a layer of follicle cells. Materials contributing to the layers of the hull are formed primarily by micro-apocrine secretion processes, in which extensions of the follicle cells and oocyte are budded off into the intercellular space, rather than by formation and release of vesicles from the Golgi bodies, as previously thought. Later in oogenesis, these secretions become organized into three functional layers, each with a characteristic substructure. Follicle cells mold the shape of the hull spines even down to the petalloid tips that are characteristic of this group. Late in oogenesis the oocyte secretes the vitelline layer beneath the hull and the follicle cells break down and are sloughed off. Differences in the mechanisms of hull formation among chitons are providing a new set of morphological characters that may yield insight into chiton phylogeny. To our knowledge, this is the first description of micro-apocrine secretions during oogenesis in a mollusc, although it has been reported in other phyla.","is_dataset_classified":null,"base_score":2.4849066497880004,"endowment":2.4849066497880004,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"21097893","pmcid":null,"openalex_id":"https://openalex.org/W2058169387","authors":[],"funders":[],"total_grants":0,"fwci":0.5069,"citation_percentile":0.67760407,"influential_citations":0,"citation_trend":[{"year":2013,"count":2},{"year":2014,"count":3},{"year":2015,"count":2},{"year":2021,"count":1},{"year":2024,"count":1}],"oa_status":"closed","license":null,"oa_locations":[{"url":"http://www.tandfonline.com/doi/pdf/10.1080/07924259.2009.9652302","host_type":"publisher"},{"url":"https://doi.org/10.1080/07924259.2009.9652302","host_type":"journal"}],"fields_of_study":["Marine and coastal plant biology","Crustacean biology and ecology","Marine Biology and Ecology Research"],"mesh_terms":[],"keywords":["Biology","Oocyte","Oogenesis","Ultrastructure","Follicle","Cell biology","Anatomy","Zoology","Botany","Embryo"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Life below water"}],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-08-18T17:15:00.741496Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}