In this article we will discuss about the gradual appearance of chordate characters in protochordates . The chordates exhibit different gradations of structural organisation from simple to complex. The protochordates including the three subphyla—Hemichordata, Urochordata and Cephalochordata—are the primitive members of the Phylum Chordata. All of them lack vertebral column and skull. They form an […]
Appearance of Chordate Characters in Protochordates
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Classification of Subphylum Cephalochordata
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In this article we will discuss about the classification of subphylum cephalochordata. Historical Resume of Subphylum Cephalochordata: The first individual of this group was described by Pallas in 1778. He regarded the specimen as a slug and named it Umax lanceolatus. Yarrell (1836) studied the animal in detail and gave the name Amphioxus lanceolatus. Costa […]
Balanoglossus, Ascidia and Branchiostoma | Phylum Chordata
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Let us learn about the comparison between balanoglossus, ascidia and branchiostoma. Comparison # Balanoglossus: 1. The pharynx is an elongated structure which is internally divided into 2 incomplete upper and lower halves by a longitudinal parabranchial ridge or Para pharyngeal ridge. The upper one is called the respiratory portion and the lower part is the […]
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