No, chaetognaths are not considered deuterostomes. They belong to the phylum Chaetognatha (arrow worms), which are classified as protostomes. They are characterized by certain developmental and anatomical features that distinguish them from deuterostomes.
No, sponges are not deuterostomes. Deuterostomes are a distinct classification of animals characterized by a particular pattern of embryonic development, which includes echinoderms and chordates such as humans. Sponges belong to the phylum Porifera, and they are considered one of the most basal and primitive animal groups.
The distinction between protostomes and deuterostomes is based on differences in their embryonic development. Protostomes develop their mouth first from the blastopore, while deuterostomes develop their anus first from the blastopore. This difference in early development leads to distinct patterns of development in the two groups.
Invertebrates develop as either protostomes or deuterostomes. During development, a protostome's first opening is its mouth. Deuterostomes, on the other hand, have their anus as their first opening during development.
Common embryonic features in deuterostomes include radial cleavage, indeterminate cleavage leading to identical twins, blastopore developing into the anus, and formation of a coelom from mesodermal tissue.
Yes, protostomes exhibit spiral cleavage, where the cells are arranged in a spiral pattern. Deuterostomes exhibit radial cleavage, where the cells are arranged in a radial pattern. This difference occurs during early embryonic development and influences the overall body plan formation.
W. Kuhl has written: 'Chaetognatha' -- subject(s): Chaetognatha
Harding B. Michel has written: 'Chaetognatha of the Caribbean Sea and adjacent areas' -- subject(s): Chaetognatha
no,deuterostomes only develop their nus fist.
deuterostomes
An arrowworm is a transparent marine worm of the phylum Chaetognatha.
Deuterostomes
deuterostomes
organisms with a complete gut
Deuterstomes
Deuterostomes. All chordates such as birds and mammals are deuterosomes.
An arrow worm is a variety of marine worm of the phylum Chaetognatha.
G. M. R. Levinson has written: 'Systematisk-geografisk Oversigt over de nordiske Annulata, Gephyrea, Chaetognatha og Balanoglossi' -- subject(s): Chaetognatha, Hemichordata