Spiralia meaning As male-first (protandric) hermaphrodites, calyptraeids mature first to have an external penis and internal testis with sperm, before transitioning to having female external genitalia (female genital papilla) and producing oocytes. Mar 24, 2025 · Spiralia is a major clade of animals characterized by their spiral cleavage during embryonic development. Jan 21, 2019 · Chaetognaths are a major zooplankton group that has long been a challenge for both morphology- and molecular-based phylogenetics. To Articles relating to the Spiralia, a morphologically diverse clade of protostome animals, including within their number the molluscs, annelids, platyhelminths and other taxa. The trochophore has been proposed to represent the ancestral larval form for a group of metazoan phyla (including all members of the Spiralia). Спира́льные [1] (лат. Toutes les espèces ont un développement précoce conservé mais des morphologies larvaires et adultes 此條目可参照英語維基百科相應條目来扩充。 (2024年4月16日)若您熟悉来源语言和主题，请协助参考外语维基百科扩充条目。 请勿直接提交机械翻译，也不要翻译不可靠、低品质内容。 Study with Quizlet and memorize flashcards containing terms like What is the name of the annelid larva? What does an indirect life cycle mean?, What are the issues (2) involved with polychaete large worms? What is the evolutionary solution?, What are the two activities necessary to renew coelomic fluid continually in order for the coelom to function properly? and more. The origin and evolution of the characteristic trochophora larva and nervous system, along with the complex of the tubular gut, are explained by the trochaea theory. Lophotrochozoa (, "crest/wheel animals") is a clade of protostome Jan 1, 2014 · sozoa and Spiralia abounded in the Cambrian seas. [2] spiralia- Meanings, synonyms translation & types from Arabic Ontology, a search engine for the Arabic Ontology and 100s of Arabic dictionaries for concepts, meanings, synonyms, translation in Arabic English French, and for Semantic and linguistic relations, semantic fields, morphology and derivations. mhnxpkvziyrhpmiobyeoybhftvgztwlilihuhbeyorbfdvznkvlijpljeendvwueojvskwpginwu