books characteristics of stingrays
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Source: mawdoo3.com
خصائص اللاسعات (Info)
تتعتبر اللاسعات من اللافقاريات وتتميز بالعديد من الخصائص منها:-
- أجسمها متماثلة وتتمحور حول نقطة مركزيه واحدة.
- جهازها الهضمي على شكل تجويف يحتوي كل من المريء والمعدة والأمعاء، ولديها فتحة واحدة فقط لأدخال الطعام وأخراج الفضلات.
- تستخدم ما يسمى لاخلايا اللاسعه (بالإنجليزية: Cnidocytes) للغذاء والدفاع عن النفس وهو السبب بتسميتها باللاسعات.
