General Zoology Post Laboratory Platyhelminthes PDF
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This document is a post-laboratory report on various animal phyla, focusing on Platyhelminthes, Nematoda, and Mollusca. It describes their body structures, reproductive methods, and other key biological characteristics. Diagrams of different species are included in the document.
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GENERAL ZOOLOGY POST LABORATORY Platyhelminthes Representative species Planaria Class Turbellaria Exhibits a dorso-ventrally flattened body structure Bilaterally symmetrical...
GENERAL ZOOLOGY POST LABORATORY Platyhelminthes Representative species Planaria Class Turbellaria Exhibits a dorso-ventrally flattened body structure Bilaterally symmetrical Acoelomate Tripoblastic Planaria No circulatory system Incomplete digestive system Muscular pharynx Ventral mouth Branched intestines Nervous system Pair of cerebral ganglia and longitudinal nerve cords connected to transverse nerves Chemoreceptors in the auricles Photoreceptors in the eye spots (ocelli) Planaria Exhibits asexual and sexual reproduction Asexual reproduction through fragmentation Good model for regenerative research Sexual reproduction: Monoecius Excretion occurs through protonephridia (flame cells) Nematoda Representative species Ascaris lumbricoides Class Chromadorea Exhibits a round (cylindrical) body structure Bilaterally symmetrical Pseudocoelomate and unsegmented Tripoblastic Ascaris lumbricoides No circulatory system Complete digestive system Nervous system Pair of cerebral ganglia and longitudinal nerve cords connected to transverse nerves Sexual reproduction Dioecious Excretion through renette glands Ascaris lumbricoides Exhibits sexual dimorphism Females are larger and longer than males. Can be distinguished based on their posterior ends Males have curved posterior ends while females have straight posterior ends. Ascaris lumbricoides 1. Non-muscular intestine 2. Vagina 3. Uterus 4. Oviducts Ascaris lumbricoides Cuticle body covering: resistant to host’s digestive juices Mouth has three lips Facilitates the attachment of the worm to the mucous membranes of the gastrointestinal tract Ascaris lumbricoides ova Unfertilized Fertilized Fertilized Fertilized (corticated) (decorticated) Mollusca Class: Bivalvia Two-shelled mollusks Clams Mussels Scallops Class: Cephalopoda Head- foot mollusk Octopus Squid Bivalvia Class: Bivalvia Genus: Perna Scientific Name: Perna viridis Left Shell Bivalva Cephalopoda Class: Cephalopoda Genus: Doryteuthis Scientific Name: Doryteuthis gahi Ventral view Eight (8) arms and two (2) tentacles Cephalopoda Cephalopoda Cephalopoda Presence of nidamental gland indicates that the squid is female
