<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: Ukudlula: Ama-squirrel aphilayo ahlukaniswe aba yizigaba ezinhlanu, anezinhlobo ezingaba ngu-58 nezinhlobo ezingaba ngu-285. I-squirrel endala kunazo zonke, i-Hesperopetes, ivela emuva e-Chadronian ngasekupheleni kwe-Eocene, cishe eminyakeni eyizigidi ezingama-40-35 edlule futhi ifana nesikhova esindizayo sanamuhla. Izinhlobonhlobo zezikhova ze-squirrel, kusukela e-Eocene yakamuva kuya e-Miocene, azikabelwanga ngokuqiniseka kunoma yimuphi umugqa ophilayo. Okungenani ezinye zalezi cishe zaziyizinhlobonhlobo ze protosquirrels zakudala ngomqondo wokuthi zazingenawo wonke ama-autopomorphies ama-squirrels aphilayo. Ukusatshalaliswa nokuhlukahluka kwalezi zinhlobo zasendulo nezokhokho kusikisela ukuthi izibungu njengeqembu kungenzeka zavela eNyakatho Melika. Ngaphandle kwalezi zinhlobo zezinsalela ezaziwa kancane, i-phylogeny yezibungu eziphilayo ilula impela. Izinhlobo ezintathu eziyinhloko yiRatufinae izibungu ezinkulu zaseMpumalanga, iSciurillinae nazo zonke ezinye izigaba ezingaphansi. I-Ratufinae iqukethe izinhlobo ezimbalwa kuphela eziphilayo ezisezindaweni ezishisayo zase-Asia. Isikhova esiyi-neotropical pygmy esisezindaweni ezishisayo zaseNingizimu Melika yilona kuphela ilungu elisaphila leSciurillinae. Uhlu lwesithathu, olukhudlwana kakhulu, lunokusakazeka okucishe kube okwendawo yonke. Lokhu kusekela ngokungeziwe umbono wokuthi ukhokho ojwayelekile wawo wonke ama-squirrels, aphilayo futhi afakwe emathunjini, wayehlala eNyakatho Melika, njengoba lezi zinhlobo ezintathu ezindala kakhulu zibonakala sengathi zivela lapho; uma ama-squirrels eqale e-Eurasia, ngokwesibonelo, umuntu angalindela ukuthi kube nezinhlobo zakudala e-Afrika, kepha ama-squirrels ase-Afrika abonakala enomsuka wakamuva. Iqembu eliyinhloko lama-squirrels lingahlukaniswa libe ngamaqembu amancane amathathu, okuholela emindenini esele. I-Sciurinae iqukethe izibungu ezindizayo i-Pteromyini kanye ne-Sciurini, okuphakathi kokunye equkethe izibungu zezihlahla zaseMelika; eyokuqala ivame ukubhekwa njenge-subfamily ehlukile, kodwa manje ibonwa njengesizwe se-Sciurinae. Ngakolunye uhlangothi, ama-pine squirrel Tamiasciurus, ngokuvamile ahlanganiswa nohlu lwezihlahla eziyinhloko, kodwa abonakala ehlukile njengama-flying squirrel;... Umbuzo: Izikhova zihlukaniswe ngemindeni emingaki?  <response>: ezinhlanu 