BAYLISASCARIS PROCYONIS (STEFANSKI AND ZARNOWSKI, 1951) ASCARIDIDAE : NEMATODA L EMBRYONIC DEVELOPMENT AND MORPHOGENESIS OF SECOND STAGE LARVAE | ||||
Assiut Veterinary Medical Journal | ||||
Article 10, Volume 21.1, Issue 41, January 1989, Page 67-75 PDF (6.33 MB) | ||||
Document Type: Research article | ||||
DOI: 10.21608/avmj.1989.188201 | ||||
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Authors | ||||
A.A. SAKLA; J.J. Donnlly; M. KHATAMI; r.n. ROCKET‘ | ||||
Abstract | ||||
Baylisascaris procyonis, the intestinal ascarid parasite of raccons (Procy- on lotor), has been implicated as an etiologic agent of human visceral larva migrans (VLM), central nervous system (CNS) disease, and ocular larva migrans (OLM)_ We have studied the early embryonic development as well as the second larval stage (L2) of B-procyonis in order to identify morphological features which will allow differentiation oi this parasite lrorn other nematode larvae. The eggs of B.pmcyonis measured 72-81 by 60-66 microns and develo- ped to infective stage in ll to 14 days at 25“C. L, prepared by artilicial hatching in vitro measured lit-18 microns in diameter by 275-290 microns in length. Eprocyonis L, had a characteristic pronou- nced oral protuberance, lateral alae, a funnel-shaped buccal vestibule, and the tail terminated in a button- shaped knob. Microtopography of B.procyonis second stage larvae was studied in detail by scann- ing electron microscopy. The anterior end was tapered to form a longitudinally striated cephalic cone. The tip of the cephalic cone was protruded, truncated, and consisted of three dorsal and two subventral lip-like oesophageal protrustions. The dorsal lip-like oecoph- ageal protrusion was separated from the fused subventrals. A pair of amphidial pores were located laterally and slightly dorsal to the subventral oesophageal protrusions. A cuticular cap from the first moult sheath sometimes appeared on the ocsophageal protrusion. Prominent lateral alae extended anteriorly from the base of the cepha- lic cone to the tail posteriorly. The excretory pore was surrounded by a prominent rim, and an oval cuticular bleb or thickening was iound anterior to the anal orifice. | ||||
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