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In order to see, whether such differences extend to the axial complex as well, we studied the axial complex of <jats:italic>Himerometra robustipinna<\/jats:italic> (Himerometridae, Comatulida) and compared it with modern Eleutherozoa. The axial coelom is represented by narrow spaces lined with squamous coelothelium, and surrounds the extracellular haemocoelic lacunae of the axial organ. The latter is located, for the most part, along the central oral\u2010aboral axis of the body. The axial organ can be divided into the lacunar and tubular region. The tubular coelomic canals penetrating the thickness of the axial organ have cuboidal epithelial lining, and end blindly both on the oral and aboral sides. The axial coelom, perihaemal coelom, and genital coelom are clearly visible, but they connect with the general perivisceral coelom and with each other via numerous openings. The haemocoelic spaces of the oral haemal ring pass between the clefts of the perihaemal coelom, and connect with the axial organ. In addition, the axial organ connects with intestinal haemal vessels and with the genital haemal lacuna. Numerous thin stone canaliculi pierce the spongy tissue of the oral haemal ring. They do not connect with the environment. On the oral side, each stone canaliculus opens into the water ring. The numerous slender tegmenal pores penetrate the oral epidermis of the calyx and open to the environment. Tegmenal canaliculi lead into bubbles of the perivisceral coelom. Some structures of the crinoid axial complex (stone canaliculi, communication between different coeloms) are numerous whereas in other echinoderms these structures are fewer or only one. The arrangement of the circumoral complex of Crinoidea is most similar to Holothuroidea. The anatomical structure and histology of the axial complex of Crinoidea resembles the \u201cheart\u2010kidney\u201d of Hemichordata in some aspects.<\/jats:p>","DOI":"10.1002\/jmor.21259","type":"journal-article","created":{"date-parts":[[2020,9,24]],"date-time":"2020-09-24T14:07:07Z","timestamp":1600956427000},"page":"1456-1475","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Axial complex of Crinoidea: Comparison with other Ambulacraria"],"prefix":"10.1002","volume":"281","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4533-7769","authenticated-orcid":false,"given":"Olga Vladimirovna","family":"Ezhova","sequence":"first","affiliation":[{"name":"Biological Faculty, Department of Invertebrate Zoology Lomonosov Moscow State University  Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vladimir Vasil'yevich","family":"Malakhov","sequence":"additional","affiliation":[{"name":"Biological Faculty, Department of Invertebrate Zoology Lomonosov Moscow State University  Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2020,9,8]]},"reference":[{"key":"e_1_2_9_2_1","volume-title":"Das System der Metazoa III: Ein Lehrbuch der phylogenetischen Systematik","author":"Ax P.","year":"2001"},{"key":"e_1_2_9_3_1","unstructured":"Balser E. 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