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Há 3 dias · Ascidians (Phylum: Chordata, Class: Ascidiacea), or sea squirts, are the largest and most diverse class of the sub-phylum Tunicata (also known as Urochordata). They comprise approximately 3000 described species found in all marine habitats from shallow water to the deep sea.
13 de jun. de 2024 · Hemichordates have been pivotal for understanding when chordate-like morphological and developmental features evolved. Recent results (Cannon et al. 2009) indicate that colonial pterobranchs evolved from a solitary acorn worm-like hemichordate ancestor and are sister group to the Harrimaniid enteropenusts, although phylogenomic ...
11 de jun. de 2024 · We resolve vetulicolians as a paraphyletic group comprising the earliest diverging stem chordates, subtending a grade of more derived stem-group chordates comprising Yunnanozoon and Pikaia. Our phylogenetic results reveal the stepwise acquisition of characters diagnostic of the chordate crown group.
Há 5 dias · The vertebrates are the only chordate group with neural cephalization, and their neural functions are centralized towards a series of vesicular enlargements in the head, which give rise to a brain.
27 de mai. de 2024 · Chordates are animals that belong to the phylum Chordata. These animals are unified by the presence in their bodies of a flexible rod that supports their backsides at some point during their development. While most chordates are vertebrates and have backbones, some are invertebrates.
29 de mai. de 2024 · From the enormous blue whale to the tiny tunicates, chordates encompass a remarkable diversity of organisms. This phylum includes mammals, birds, reptiles, amphibians, fish, and a variety of marine invertebrates, showcasing the vast array of forms and lifestyles found within the chordate group.
Há 1 dia · scaleless, fish-like marine chordates that widely occur in shallow water throughout the oceans in the world. the notochord runs the entire length of the dorsal nerve cord and persists throughout the animals life. they have many pharyngeal gill slits, lack pigment in their skin, and their body is pointed at both ends.
