Exercise 2: Family Fasciolidae PDF

Exercise 2: Family Fasciolidae JACQUIELYN A. BAYDO, DVM Structure of Generalized Digenetic Trematode  Class Trematoda: Digenea Outer cuticle layer: +/- bear spines Has an anterior (oral sucker) and ventral sucker (acetabulum) for attachment  Class Trematoda: Digenea Excretory system...

Exercise 2: Family Fasciolidae JACQUIELYN A. BAYDO, DVM Structure of Generalized Digenetic Trematode  Class Trematoda: Digenea Outer cuticle layer: +/- bear spines Has an anterior (oral sucker) and ventral sucker (acetabulum) for attachment  Class Trematoda: Digenea Excretory system ◦ Bladder (sac-like) in its simplest form which usually terminates in the posterior part of the body ◦ Flame cell: excretory cell collecting waste product from its surroundings to be excreted  Class Trematoda: Digenea Nervous system ◦ Composed of a circum-esophageal ring of fibers and a ganglia Sense organs ◦ Adult ◦ NOT present ◦ Free-living larval forms (miracidium and cercaria) ◦ +/- patches of pigment called eye spots Class Trematoda: Digenea General Life Cycle Family Fasciolidae  Fasciolidae There are three important genera: ◦ Fasciola ◦ Fascioloides ◦ Fasciolopsis  Family Fasciolidae, Genus Fasciola Fasciola hepatica ◦ Common liver fluke, sheep liver fluke ◦ Ova: thin-shelled, oval, operculate, browny-yellow and large ◦ Testes, ovary, ceca: branched ◦ Predilection site: Liver / bile ducts ◦ DH: Sheep, cattle, goat, horse, deer, man, other mammals ◦ IH: Snails of the genus Lymnaea ◦ Most common: Lymnaea truncatula  Family Fasciolidae, Genus Fasciola Fasciola gigantica ◦ Tropical large liver fluke ◦ Ova: similar but larger than those of F. hepatica ◦ Predilection site: Liver / bile ducts ◦ IH: Snails of the genus Lymnaea ◦ DH: Cattle, buffalo, sheep, goat, pig, camel, deer, man  Family Fasciolidae, Genus Fascioloides Fascioloides magna ◦ Giant liver fluke; large American liver fluke; deer fluke ◦ Gross: ◦ Large and thick, no anterior cone ◦ Rounded posterior end ◦ When fresh: flesh-colored ◦ Predilection site: Liver, occasionally bile duct ◦ DH: Deer, cattle, sheep, goat, pig, horse ◦ IH: Variety of freshwater snails, Fossaria spp, Lymnaea spp, Stagnicola spp  Family Fasciolidae, Genus Fasciolopsis Fasciolopsis buski ◦ Predilection site: SI ◦ DH: Man and pig ◦ IH: “flat shelled snails” Planorbis sp., Segmentina sp., ◦ Gross appearance: ◦ Large thick-set fluke without shoulders ◦ May vary in size ◦ Elongate oval, slightly broader posteriorly ◦ Ventral sucker is situated near the anterior extremity ◦ Much larger than the oral sucker  Family Fasciolidae, Genus Fasciolopsis Fasciolopsis buski ◦ Unbranched intestinal ceca ◦ Testes are tandem ◦ Branched and posterior in position ◦ Ovary ◦ Slightly to the right of the midline ◦ Vitelline glands occupy the lateral fields  Family Fasciolidae, Genus Parafasciolopsis Parafasciolopsis fasciolaemorpha ◦ Predilection site: Gall bladder and digestive tract ◦ DH: Elk and wild goat ◦ 3-7.5 mm long by 1-2.5 µ in diameter ◦ IH: Snail; Coretus sp.  Fascioloides magna Fasciola gigantica and Fasciola hepatica Fasciolopsis buski Illustrations to be submitted: Fasciola gigantica whole mount Fasciola gigantica LS (anterior end only) Fasciola hepatica Fascioloides magna Fasciolopsis buski Fasciola ovum Fasciola miracidium Identify and label. ALL lab exers: traditional drawing Deadline: September 30, 2024 (Monday)