Nematoda_and_Rotifera_2008

Nematoda_and_Rotifera_2008 - Radiata Metazoa Ancestral...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Porifera Cnidaria Ctenophora Phoronida Ectoprocta Brachiopoda Echinodermata Chordata Platyhelminthes Mollusca Annelida Arthropoda Rotifera Nemertea Nematoda Radiata Deuterostomia Protostomia Bilateria Eumetazoa Metazoa Ancestral colonial flagellate Phylum: Nematoda pseudocoelomate
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Kingdom: Animalia Phylum: Nematoda (formerly Aschelminthes) non-segmented, smooth worms tapered at both ends bilateral symmetry >80,000 species described most common soil inhabitant 15,000 parasitic species generally less than 5 cm (some parasitic ones longer) covered in thick, tough, protective cuticle cuticle is a syncitial epidermis molt several times during lifespan triploblastic pseudocoelomate- 1st group to evolve a body cavity
Background image of page 2
Kingdom: Animalia Phylum: Nematoda (formerly Aschelminthes) pseudocoelomate- coelom partially lined with mesoderm
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Advantages of Evolution of a Body Cavity fluids moving within cavity can function as circulatory system fluid in cavity makes body rigid allowing for muscle driven body movement, a “hydrostatic skeleton” organs can function without being deformed by body movement food movement not controlled by locomotion of animal making digestion and waste removal more efficient
Background image of page 4
complete digestive system one-way digestion (mouth and anus) tube within a tube nervous system sensory structures and ganglia at head nerve ring with ganglia around the pharynx ventral and dorsal nerve cords reproduction is sexual most have separate males and females (dioecious) reproductive organs in body cavity females release chemical attractants Kingdom: Animalia Phylum: Nematoda (formerly Aschelminthes)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
locomotion longitudinal muscles under epidermis no circular muscles can only undulate side-to-side (whip-like motion) no cilia “hydrostatic skeleton” aids in movement excretory system waste moved via fluid in body cavity may have excretory ducts/pores as well as gland cells for waste removal
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/06/2011 for the course BIO 1201 taught by Professor N.haque during the Spring '09 term at CUNY City Tech.

Page1 / 25

Nematoda_and_Rotifera_2008 - Radiata Metazoa Ancestral...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online