Metazoan Parasites Flashcards
Nematode Features
Cuticle Hypodermis Musculature Pseudocoelom Single digestive tract Reproductive tract
Trematode Features
Tegument LACK a body cavity Paired ceca Oral sucker Hermaphroditic Vitellaria (yolk-forming glands) Operculated eggs
Cestode Features
Tegument LACK a body cavity LACK a digestive tract Segmented Hermaphroditic (each proglottid: male & female) Calcareous corpuscles Scolex
Acanthocephalan Features
Cuticle Spined/Hooked Proboscis Leminisci Thick hypodermis w/ lacunar channels & thick felted layer Two Muscle layers Pseudocoelom LACK a digestive tract
Pentastome Features
Sclerotized openings in body wall Two pairs of hooks around mouth Striated muscle Appear segmented (pseudosegmented) Multicellular intestine bordered by two acidophilic glands
Arthropod Features
Chitinous exoskeleton/body wall Skeletal muscle Jointed appendages Tracheal system for respiration Spines
Rhabditoid genera
Strongyloides
Halicephalobus
Pelodora
Rhabdias
Rhabditoid features
Platymyarian musculature
Small size
Uninucleate eggs
Rhabditiform esophagus
Oxyurid genera
Oxyuris
Enterobius
Syphacia
Aspicularis
Oxyurid features
Platymyarian musculature
Rhabditioid esophagus
Lateral alae
Thick-shelled eggs containing an embryo
Ascarid genera
Ascaris Parascaris Toxocara Toxascaris Heterakis Baylascaris
Ascarid features
Coelomyarian musculature Large size Lateral alae Large lateral cords Thick-walled eggs
True Strongyles genera
Strongylus Ancylostoma Oesophagostomum Stephanurus Syngamus Small stronglyes (Cyathostomes)
True Strongyles features
Platymyarian musculature Thick, smooth cuticle Vacuolated lateral cords Lateral internal cuticular ridge Prominent intestinal brush border
Trichostrongyles genera
Ostertagia Haemonchus Trichostrongylus Nematodirus Hyostrongylus Dictyocaulus
Trichostrongyles features
Platymyarian musculature
Cuticle with longitudinal ridges
Metastrongyles genera
Muellerius Protostrongylus Metastrongylus Aelurostrongylus Filaroides Crenosoma Angiostrongylus Oslerus Parelaphostrongylus
Metastrongyles features
Coelomyarian musculature
Accessory hypodermal cords
Loose cuticular sheath with ridges (some)
Thin-walled, embryonated eggs
Spiurids genera
Habronema Draschia Spirocerca Thelazia Physaloptera
Spiurids features
Coelomyarian musculature Large intestine with brush border Very large lateral cords Oval, thick-shelled, embryonated eggs Eosinophilic fluid in pseudocoelom
Filarids genera
Dirofilaria Onchocerca Stephanofilaria Eleaophora Setaria Dipetalonema
Filarids features
Coelomyarian musculature
Small size
Larvae (microfilaria) in bloodstream or tissue
Small lateral cords
Lateral internal ridge within lateral cords
Very small intestine
External cuticular ridges (some)
Aphasmids genera
Trichuris Capillaria Trichinella Dioctophyma Anatrichosoma
Aphasmids features
Bacillary band
Stichosome
Bipolar plugged eggs
