Pseudocoelomate Characteristics, Evolutionary perspective, Body plan, Forms and Function, Classification, and Representative types.

1. PSEUDOCOELOMATE
ANIMALS
General Zoology
(Lecture)
BS BIOLOGY – 2
October 9, 2012

2. PRESENTERS:
ALLAWAN, Jovany Gleen
CEDEÑO, Jekkey Ann
DANLAG, Patrick Joel
LUNA, Nikki
SALAGA, Harvey
TAGLUCOP, Marietta Ivana

3. I. Background
Pseudocoelamate
- Greek word ‘Pseudo’ means
false, + ‘koilṍma’ cavity.
Have
a pseudocoelom

4. Composed of 7 phyla:
1. Rotifera
5. Nematomorpha
2. Kinorhyncha
6. Acanthocephala
3. Loricifera
7. Nematoda
4. Priapulida

5. II. Evolutionary Perspective

6. Disagreement among
Zoologist
Pseudocoelomate (Morphology)
Convergent Evolution
Lophotrochosozoa
Aschelminthes
Acoelomate
Ecdysozoa

7. III. General Characteristics

8. Body Plan
Bilateral
symmetry
Germ
layer: Ectoderm, Mesoderm,
Endoderm (Triploblastic)
Unsegmented
Cylindrical
in cross section
Pseudocoel

9. Size:
Microscopic
1um – 3 mm
Osmoregulation:
Protonephridia
Sex:
Dioecious
presence of

10. IV. FORMS AND FUNCTIONS

11. Habitat
1. Cosmopolitan (anywhere in the world)
2. Freshwater
- Rotifera
3. Marine
- all except Nematomorpha,
Nematoda

12. 4. Terrestrial
- Rotifera, Kinorhyncha, Priapulida

13. Length
Phyla
Length
Loricifera
< 1 mm
Kinorhyncha
< 1 mm
Rotifera
0.1 – 3 mm

14. Acanthocephala
< 40 mm
Priapulida
2mm- 8cm
Nematomorpha
10 – 100 cm
Nematoda
< 1mm-several
meters

15. Length of Pseudocoelomate animals
Integrated principles of Zoology, 11th edition by Hickman, Roberts, Larson

16. Locomotion
1.
Anchoring spines
2.
Cilia
3.
Contraction of Muscles

17. Nutrition
• Digestive System
- mouth, pharynx, intestine, anus
•Tegument
- Acanthocephala

18. Growth and Development
•Larval Stage
Eutely

19. Excretion
•
Protonephridia
-Except in Nematodes
Unique characteristics
Cloacal
bladder
- Rotifera
Glandular
and tubular system
- Nematoda

20. Nervous system
Brain
Nerve
Ganglion

21. Sensory
Eyespots
Amphids
and Phasmids

22. Reproduction
•
sexually and parthenogenesis
•
Dioecious

23. V. CLASSIFICATION

24. Phyla
Rotifera
Classes:
Seisonidea
Bdelloidea
Monogononta

25. Nematoda
Classes:
Secernentea
Adenophorea

26. Kinorchyncha
Loricifera
Priapulida
Nematomorpha
Acanthocephala

27. VI. REPRESENTATIVE
TYPES

28. Causes disease to humans
1.
Nematode
a. Ascaris lumbricoides
Common name: Roundworm
b. Trichinella spiralis
Common name: Pork worm
c. Wuchereria bancrofti
Common name: Filarial worm filariasis

29. Ascaris lumbricoides
Hosts:
Definitive- Humans
Life cycle
Harm- causes pneumonia and intestinal
blockage

30. Ascaris worm in human intestine

31. Trichinella spiralis
Hosts:
Intermediate- Pig
Definitive- Humans
Life Cycle
Harm: causes Trichinosis

32. Trichinella spiralis larvae in the muscle of the pig

33. Wuchereria bancrofti
Hosts:
Intermediate- mosquito
Definitive- Humans
Life Cycle
Harm: causes elephantiasis

34. VII. Summary
Have
a pseudocoel.
A
constant number of body cells or
nuclei (eutely).
Most
have a complete digestive
system with a well-developed
pharynx.

35. 
composed of 7 phyla:
Rotifera
Class:
Seisonidea
Bdelloidea
Monogononta
Nematoda
Class:
Secernentea
Adenophorea

36. Priapulida
Nematomorpha
Acanthocephala
Kinorhyncha
Loricifera

37. VIII. References
Zoology
7th ed. (S. Miller & J. Harley: ©2007)
Zoology 8th ed. (S. Miller & J. Harley:©2011)
Integrated Principles of Zoology 11th ed. (C.
Hickman, L. Roberts & A. Larson:©2001
Integrated Principles of Zoology 14th ed. (C.
Hickman, L. Roberts & A. Larson:©2008
http://msangellino.wordpress.com
/category/uncategorized/
http://www.glerl.noaa.gov/seagrant/GLWL/Zoop

38. THANK YOU
FOR LISTENING
AND GOD
BLESS US ALL 

39. Fig.1 Pseudocoelomate Body Plan

40. Fig.2 Triploblastic

41. Fig.4 Cylindrical in Cross Section

42. Fig.6 Tegument of Acanthocephala

43. Fig.7 Nerve Ganglion

44. Fig.8 Life Cycle of Ascaris lumbricoides

45. Fig. 9Life Cycle of Trichinella spiralis

46. Fig. 10 Life Cycle of Filarial worm

47. Fig. 11 Cylindrical in cross section

48. Fig.13 Protonephridia

49. Fig.15 Phasmids of Nematodes

50. Fig. 16 Amphids of Nematodes

51. Kinorhyncha
Priapulida
Loricifera

52. Mouth
Pharynx
Intestine
Anus
Digestive System of Rotifer and Nematode

53. Contraction of Muscles

54. Fig.13 Protonephridia

55. Philodina Rotifer

56. Philodina Rotifer

57. Life Cycle of Acanthocephala

58. Locomotion of Rotifera

59. Brain of a Nematode

60. Parthenogenesis

61. Ovary
Spicules
Reproduction of Nematodes

62. Glandular and Tubular system of Nematode