20%20Apicomplexa09[1]

20%20Apicomplexa09[1] - XX Phylum Apicomplexa (Chapter 8)...

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75 XX Phylum Apicomplexa (Chapter 8) 2009 A. Characteristics 1. All are parasitic 2. APICAL COMPLEX a. Group of organelles used to invade host cells b. Visible only with electron microscopy Picture Slide #1: Schematic diagram of a typical apicomplexan illustrating the organelles of the apical complex ; Fig. 8.1, p. 124 B. Class Gregarinea [GREGIS = flock, herd] 1. Overview a. Parasitize cells and body cavities of invertebrates b. Isogamous (1) Male & female gametes (2) Similar in shape c. No merogony as in Coccidea 2. Suborder Aseptatina [A = w/o, SEPTUM = partition] aka acephaline gregarines a. Gamete-producing stage [= GAMONT] is NOT divided into 2 parts by a septum. Picture Slide #2: Life-cycle of Monocystis lumbrici , an aseptate gregarine in earthworms; Fig. 8.2, p. 125 b. Monocyctis lumbrici (= M. agilis ) (1) Infects earthworms (2) Life-cycle (a) Distribution of spores 1) Worms eaten by predator a) Spores resist digestion b) Voided in predator feces 2) Leave worm through genital pores (b) Spores in soil are eaten by worms and hatch in lumen (c) Trophozoites move to seminal vesicle of worms 1) Infect sperm mother cells where they increase in size 2) Mature trophozoites leave host cell and consume sperm cells (3) Ecology (a) Almost all worms infected (b) Surprisingly, parasite does NOT appear to lower fertility of host 3. Suborder Septatina aka cephaline gregarines a Gamont morphology (1) Divided by septum (2) PROTOMERITE [PROTO = 1st] (a) Anterior portion (b) May have an EPIMERITE
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76 1) With hooks 2) Anchors organism onto host cells Picture Slide #3: Anatomy of a Septate Gregarine showing epimerite, protomerite, deuteromerite and nucleus; Lee, R.R. et al., 1985, An Illustrated Guide to the Protozoa , p. 339 Picture Slide #4: Pyxinoides balani attached to host intestinal cell; Lee, R.R. et al., 1985, An Illustrated Guide to the Protozoa , p. 336 (3) DEUTEROMERITE [DEUTEROS = 2nd] (a) Larger posterior portion (b) Contains nucleus b Gregarina infects cockroaches and mealworms C. Class Coccidea [COCCIDIO = berry, grain] 1. Overview a Intracellular parasites of vertebrates b Pathogenic c ANISOGAMOUS: Gametes dissimilar
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20%20Apicomplexa09[1] - XX Phylum Apicomplexa (Chapter 8)...

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