Triploblastik

Triploblastik adalah kondisi gastrulasi di mana terdapat tiga lapisan germinal primer: ektoderm, mesoderm, dan endoderm. Sel nutfah disisihkan dalam embrio pada tahap blastula, yang dimasukkan ke dalam gonad selama organogenesis. Lapisan kuman terbentuk selama gastrulasi blastula. Istilah triploblast dapat mengacu pada sel telur mana pun di mana blastoderm terbagi menjadi tiga lapisan.[1]

Semua bilateria, hewan dengan embrio simetris bilateral, bersifat triploblastik. Taksa hewan lainnya, ctenophores, placozoans dan cnidarians, adalah diploblastik, artinya embrio mereka hanya mengandung dua lapisan germinal. Porifera bahkan kurang terspesialisasi secara perkembangan, tidak memiliki jaringan[2] and organ.[3]

Triploblas paling awal diperkirakan telah berevolusi dari diploblas beberapa waktu di Proterozoikum, membentuk diri mereka sebagai kelompok sebelum diversifikasi selama letusan Kambrium.[4][5][6]

Lihat pula

Referensi

  1. ^ Ravichandra (Jan 1, 2008). Plant Nematology. I. K. International Pvt Ltd. hlm. 29. ISBN 9788189866617. Diarsipkan dari versi asli tanggal 2021-08-27. Diakses tanggal 2023-05-07. 
  2. ^ Hooper, John (2018). "Structure of Sponges". Queensland Museum. Diarsipkan dari versi asli tanggal 26 September 2019. Diakses tanggal 27 September 2019. 
  3. ^ Thacker, Robert W; Diaz, Maria Christina (8 September 2014). "The Porifera Ontology (PORO): enhancing sponge systematics with an anatomy ontology". J Biomed Semantics. 5 (39): 39. doi:10.1186/2041-1480-5-39. PMC 4177528 alt=Dapat diakses gratis. PMID 25276334. 
  4. ^ Gu, Xun (1998). "Early metazoan divergence was about 830 million years ago". Journal of Molecular Evolution. 47 (3): 369–371. Bibcode:1998JMolE..47..369G. doi:10.1007/PL00013150. PMID 9732464. 
  5. ^ Lynch, Michael (1999). "The age and relationships of the major animal phyla". Evolution. 53 (2): 319–325. doi:10.1111/j.1558-5646.1999.tb03768.x alt=Dapat diakses gratis. PMID 28565434. 
  6. ^ Seilacher, Adolf; Pradip K., Bose; Pflüger, Friedrich (1998). "riploblastic animals more than 1 billion years ago: trace fossil evidence from India". Science. 282 (5386): 80–83. Bibcode:1998Sci...282...80S. doi:10.1126/science.282.5386.80. PMID 9756480. 

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