Thanks for the mention,
@Toritoribe. I'm more of a phonology enthusiast, but I was already writing a response... has anyone else had trouble posting or saving their posts?
@nihongootaku, Is this for a Japanese language class or a Phonology class focusing on Japanese?
Looks like the sheet your teacher gave you contains a
broader phonetic transcription, which is why it contains less detailed information than what you see on wikipedia. It's not as precise but that doesn't make it wrong, and chances are you'll be graded based on the materials given to you in the class, so you probably don't need the extra stuff, but if your teacher knows their phonology it could be an interesting conversation.
The extra diacritics narrows how the sounds are pronounced (such as
devoicing and
compression of the ɯ vowel in your example).
If you're talking
phonemes, it would be /huta/, as [ɯ] is the more precise pronunciation/allophone of the /u/ phoneme. Most people simply know it as "u," and would be confused if you wrote a word with ɯ. Similarly, the phoneme for the initial consonant is /h/, pronounced [ɸ], and many foreign speakers write it as "f", but Japanese people also romanize it as "h" because "f" lives under the "h" consonant group.
Easily enough, phonemically it's still /nihongo/
Another IPA resource that includes some explanation of the diacritical marks:
http://www.ablongman.com/html/productinfo/bauman3e/020554925X_ch03.pdf
List of Japanese Phonemes:
Japanese phonology - Wikipedia, the free encyclopedia
Comparative phonology of English and Japanese (PDF):
http://www.google.com/url?sa=t&rct=...d=1680&usg=AFQjCNH6FkPRF7rxfnW2u4X6LpTWACe8uQ