PSEUDOCOELOMATEPSEUDOCOELOMATEANIMALSANIMALS
General Zoology (Lecture)
BS BIOLOGY – 2October 9, 2012
PRESENTERS:
ALLAWAN, Jovany GleenCEDEÑO, Jekkey AnnDANLAG, Patrick JoelLUNA, NikkiSALAGA, HarveyTAGLUCOP, Marietta Ivana
I.I. BackgroundBackground
Pseudocoelamate - Greek word ‘Pseudo’ means
false, + ‘koil ma’ ṍ cavity.
Have a pseudocoelom
Composed of 7 phyla:
1. Rotifera 5. Nematomorpha
2. Kinorhyncha 6. Acanthocephala
3. Loricifera 7. Nematoda
4. Priapulida
IIII. . Evolutionary PerspectiveEvolutionary Perspective
Acoelomate
Lophotrochosozoa Ecdysozoa
Convergent Evolution
Aschelminthes
Pseudocoelomate (Morphology)
Disagreement among Zoologist
III. General CharacteristicsIII. General Characteristics
Body PlanBilateral symmetry
Germ layer: Ectoderm, Mesoderm, Endoderm (Triploblastic)
Unsegmented
Cylindrical in cross section
Pseudocoel
Size: Microscopic1um – 3 mm
Osmoregulation: presence of Protonephridia
Sex: Dioecious
IV. FORMS AND FUNCTIONSIV. FORMS AND FUNCTIONS
HabitatHabitat1. Cosmopolitan (anywhere in the world)
2. Freshwater- Rotifera
3. Marine- all except Nematomorpha,
Nematoda
4. Terrestrial- Rotifera, Kinorhyncha, Priapulida
LengthLength Phyla Length
Loricifera < 1 mm
Kinorhyncha < 1 mm
Rotifera 0.1 – 3 mm
Acanthocephala < 40 mm
Priapulida 2mm- 8cm
Nematomorpha 10 – 100 cm
Nematoda < 1mm-several meters
Length of Pseudocoelomate animalsLength of Pseudocoelomate animals
Integrated principles of Zoology, 11th edition by Hickman, Roberts, Larson
LocomotionLocomotion
1. Anchoring spines
2. Cilia
3. Contraction of Muscles
NutritionNutrition
• Digestive System - mouth, pharynx, intestine, anus
•Tegument- Acanthocephala
Growth and Development
•Larval Stage
Eutely
ExcretionExcretion
• Protonephridia -Except in Nematodes
Cloacal bladder
- Rotifera
Glandular and tubular system
- Nematoda
Unique characteristics
Nervous systemNervous system
Brain
Nerve Ganglion
SensorySensory
Eyespots
Amphids and Phasmids
ReproductionReproduction
• sexually and parthenogenesis
• Dioecious
V. CLASSIFICATION
Phyla
RotiferaClasses:
Seisonidea
Bdelloidea
Monogononta
Nematoda Classes:
Secernentea
Adenophorea
Kinorchyncha
Loricifera
Priapulida
Nematomorpha
Acanthocephala
VI. REPRESENTATIVE TYPES
Causes disease to humans1. Nematode
a. Ascaris lumbricoidesCommon name: Roundworm
b. Trichinella spiralisCommon name: Pork worm
c. Wuchereria bancroftiCommon name: Filarial worm filariasis
Ascaris lumbricoides
Hosts:Definitive- Humans
Life cycle
Harm- causes pneumonia and intestinal blockage
Ascaris worm in human intestine
Trichinella spiralisHosts:
Intermediate- PigDefinitive- Humans
Life Cycle
Harm: causes Trichinosis
Trichinella spiralis larvae in the muscle of the pig
Wuchereria bancroftiHosts:
Intermediate- mosquito Definitive- Humans
Life Cycle
Harm: causes elephantiasis
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.
composed of 7 phyla:
RotiferaClass:
Seisonidea Bdelloidea Monogononta
Nematoda Class:
Secernentea Adenophorea
Priapulida
Nematomorpha
Acanthocephala
Kinorhyncha
Loricifera
VIII. ReferencesZoology 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:©2001Integrated Principles of Zoology 14th ed. (C.
Hickman, L. Roberts & A. Larson:©2008http://msangellino.wordpress.com
/category/uncategorized/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Pages/Asplanchnidae.html
THANK YOU FOR LISTENING AND GOD BLESS US ALL
Fig.1 Pseudocoelomate Body Plan
Fig.2 Triploblastic
Fig.4 Cylindrical in Cross Section
Fig.6 Tegument of Acanthocephala
Fig.7 Nerve Ganglion
Fig.8 Life Cycle of Ascaris lumbricoides
Fig. 9Life Cycle of Trichinella spiralis
Fig. 10 Life Cycle of Filarial worm
Fig. 11 Cylindrical in cross section
Fig.13 Protonephridia
Fig.15 Phasmids of Nematodes
Fig. 16 Amphids of Nematodes
Kinorhyncha Priapulida Loricifera
Digestive System of Rotifer and Nematode
MouthPharynx
Intestine
Anus
Contraction of Muscles
Fig.13 Protonephridia
Philodina Rotifer
Philodina Rotifer
Life Cycle of Acanthocephala
Locomotion of Rotifera
Brain of a Nematode
Ovary
Spicules
Reproduction of Nematodes
Glandular and Tubular system of Nematode