تبلیغات
زیست شناسی گرگان - رده بندی خرس ها

امروز:

رده بندی خرس ها

با سلام
در کتاب زیست شناسی سال دوم در مطلب مربوط به رده بندی جانداران, در تصویری که چندان واضح هم نیست, به رده بندی طنابداران پرداخته شده و  خرس نیز در این گروه قرار می گیرد.
در این تصویر  خرس در راسته گوشتخواران قرار گرفته ولی در تاکسون سگ سانان وجود ندارد و سوالی که مطرح می شود اینست که خرس در چه تیره ای قرار می گیرد؟

توجه داشته باشید که خرس حد میانی گربه سانان و سگ سانان است و جانوری همه چیزخوار است.
بهتر است رده بندی پستانداران را بررسی کنیم:
پستانداران امروزی به سه دسته تقسیم می شوند:
1- مرغسانان     مثل پلاتی پوس و اکیدنه
2-کیسه داران   مثل کانگورو و اپاسوم
3-جفت داران  که از نظر رژیم غذایی به سه دسته گوشتخوار-گیاهخوار و همه چیزخوار تقسیم می شوند.
پستانداران را میتوان به صورت زیر تقسیم بندی کرد:
1-حشره خواران
2-جوندگان
3-خرگوشان
4-خفاشان
5-گوشت خواران
6-باله داران
7-آب بازان
8-فیل ها
9-سم داران
10-بی دندانان
11- نخستی ها
 در این تقسیم بندی, گوشتخواران را به زیر گروه پنجه داران و باله داران تقسیم می کنند و پنجه داران شامل:
1-سگ سانان
2-گربه سانان
3-خرسان
4-خزها


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