網頁Protostome and deuterostome embryos differ in several other ways. Many protostomes (the Spiralia clade) undergo spiral cleavage during cell division instead of radial cleavage. [5] Spiral cleavage happens because the cells' division planes are angled to the polar major axis, instead of being parallel or perpendicular to it.

網頁Protostomia, group of animals—including the arthropods ( e.g., insects, crabs), mollusks (clams, snails), annelid worms, and some other groups—classified together largely on the basis of embryological development. The mouth of the Protostomia ( proto, “first”; stoma, “mouth”) develops from the first opening into the embryonic gut ...

網頁Define protostome. protostome synonyms, protostome pronunciation, protostome translation, English dictionary definition of protostome. n. Any of numerous invertebrate animals of the group Protostomia, in which the mouth develops from the first opening in the ...

網頁protostome (redirected from Protostomes) Also found in: Medical. pro·to·stome (prōt′tə-stōm′) n. Any of numerous invertebrate animals of the group Protostomia, in which the mouth develops from the first opening in the embryo and the anus develops later, and ...

網頁2017年2月26日 · “Deuterostome”.Wikipedia,thefreeencyclopedia.2017.Accessed16Feb.2017 Image Courtesy: 1.“Protovsdeuterostomes”. By Y assineMrabet – Own work (CC BY SA 3.0) via Commons Wikimedia

• Comparative embryology ·
• Evolutionary embryology ·
• Origins of modern embryology

網頁동물 (動物) 또는 애니멀 ( 영어: Animal )은 동물계 (動物界, Animalia)로 분류되는 생물 의 총칭이다. 엽록소 (葉綠素)를 갖지 않고 세포벽 (細胞壁)을 갖지 않으며 몸속에 여러 기관 (器官)이 있는 생물 중 다세포 (多細胞)인 것을 말한다. 일반적으로 운동 능력과 ...

網頁2020年4月16日 · What phylum is Protostome? Protostomia and Deuterostomia are considered super-phyletic taxa, each containing a variety of animal phyla. Traditionally, the protostomes include the Annelida, Arthropoda, and Mollusca, and the deuterostomes comprise the Echinodermata and Chordata.

網頁2011年2月15日 · Yes, a protostome is, and so is a deuterostome. Neither are diploblastic. This is mainly because of the developement of the coelem or body cavity. Just remember, both protosome ...

網頁Ang Deuterostomia ay kinabibilangan ng mga bertebrado kabilang ang tao, mga sea star at mga crinoid. Sa pag-unlad ng embryo ng deuterostome, ang unang bukanan (blastopore) ay nagiging tumbong samantalang ang bibig ang kalaunang nabubuo. Ito ang natatanging katangian nito ngunit natuklasan rin ito sa mga protostome.