Salient Characters and General Features of Phylum Acanthocephala

Discover the salient characters and general features of Phylum Acanthocephala, a group of parasitic organisms with unique anatomical characteristics. Explore the body structure, presence of a retractable proboscis, absence of body segmentation and alimentary canal, as well as the lack of certain organ systems. Learn about the classification and distinguishing traits of these organisms within their phylum.

• Parasites
• Acanthocephala
• General Features
• Retractable Proboscis
• Endoparasites

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1. Salient Characters Salient Characters of of Phylum: Phylum: Acanthocephala Acanthocephala Bihar Animal Sciences University | Dr. AJIT KUMAR Dr. AJIT KUMAR Department of Veterinary Parasitology Department of Veterinary Parasitology Bihar Veterinary College Bihar Veterinary College Bihar Animal Sciences University Bihar Animal Sciences University Patna Patna- -800014 800014 Image source: Google image

2. Salient Characters of Salient Characters of Phylum: Phylum: Nemathelminthes Nemathelminthes & & Acanthocephala Acanthocephala o Parasites Parasites are are eukaryotic eukaryotic organisms organisms. . Parasites Protozoa Protozoa (Unicellular) (Unicellular) Arthropods Arthropods (Metazoa- Multicellular) Helminth Helminths s ( (Metazoa Metazoa- - Multicellular) Multicellular) Phylum: Phylum:- - Platyhelminthes Platyhelminthes Phylum: Phylum:- - Acanthocephala Acanthocephala Phylum: Phylum:- - Nemathelminthes Nemathelminthes

3. Salient Characters of Salient Characters of Phylum: Phylum: Nemathelminthes Nemathelminthes & & Acanthocephala Acanthocephala Helminth Helminth word word has has been been derived derived from from a a Greek Greek word word helmins helmins or or helminthos helminthos which which means means a a worm worm. . Helminths Helminths (worms) (worms) are are mainly mainly endoparasites endoparasites. . Helminths Platyhelminthe Platyhelminthes s Nemathelminthes Nemathelminthes Acanthocephala Acanthocephala

4. Characters of Phylum- Acanthocephala General Characters: Body is cylindrical with thick cuticle like nematodes A retractable proboscis at the anterior end and it is armed with hooks, hence they are called as thorny headed worms. Image source: Google image

5. Characters of Phylum- Acanthocephala General Characters: Body cavity present (Pseudocoelomate) Body segmentation absent Sucker absent Alimentary canal absent.

6. Characters of Phylum- Acanthocephala General Characters: Unisexual Excretory system absent or a pair of nephridia present. Image source: Google image

7. Salient Characters of Salient Characters of Phylum: Phylum: Acanthocephala Acanthocephala o Life-cycle: Indirect o Females are ovo-viviparpous. o Females are longer than male. o Eggs are spindle shaped with thickened shell containing a larva called acanthor which has an anterior circlet of hooks. Egg o Larvated eggs are ingested by the arthropod hosts and cystacanth. intermediate develop into o Final hosts get infection by the ingestion of cystacanth infected arthropods. Image source: Google image

8. Salient Characters of Salient Characters of Phylum: Phylum: Acanthocephala Acanthocephala Life-cycle: Indirect Image source: Google image

9. Phylum Phylum: : Acanthocephala Acanthocephala Family: Oligacanthorhynchidae Genus: Macrocanthorhynchus Species: Macrocanthorhynchus hirudinaceus Image source: Google image