Therizinosauria

**Terizinozorlar** veya **Therizinosauria** (Yunanca:"tırpan kertenkeleleri"), Kretase döneminde Asya ve Kuzey Amerika'da  yaşamış, üyelerinin ellerinde uzun, tırpan benzeri pençeler bulunan maniraptoran dinozor grubu.

Terizinozorlar bilinen tüm dinozorların en tuhafıydı. En büyüğü, chalicotherler adı verilen tuhaf, soyu tükenmiş, toynaklı memelilere benziyordu. Terizinozorların bilek ve ayak parmakları, *[[Oviraptor]], [[Allosaurus]]* gibi "sert kuyruklu" (tetanuran) teropodlar olduklarını gösterir.

## Keşif tarihi

Uzun yıllar boyunca bilim insanları, bir prosauropod gibi dört parmaklı ayakları ve tırpan şeklindeki pençeleri içeren fosil parçalarından canlının neye benzediklerini tahmin etmek zorunda kaldılar. Paleontologlar, dev pençelerin gizemli sahibine *[[Therizinosaurus]]* adını verdiler. 1988'de, daha önceki bir akraba olan *[[Alxasaurus]]*un daha eksiksiz iskeletleri Çin'de ortaya çıktı. Bu terizinozorun kemiklerinin önceki buluntularla karşılaştırılması, bilim adamlarının "tırpan kertenkelelerini" büyük, yavaş hareket eden, iki ayaklı dinozorlar olarak hayal etmelerini sağladı.

## Filogeni
Aşağıdaki kladogram, 2010 yılında Lindsay E. Zanno tarafından yapılan Therizinosauria'nın kapsamlı filogenetik analizini takip etmektedir.

Aşağıda, 2010 yılında Zanno tarafından sağlanan veriler kullanılarak Hartman ve diğerleri 2019 tarafından yakın zamanda oluşturulan filogenetik analiz yer almaktadır:

## Dağılım

Terizinozorlar Doğu Asya ve Kuzey Amerika'da yaşadılar. Çoğu tür Kretase döneminde yaşadı, ancak Erken Jura'dan bir terizinozor bildirildi.

## Cinslerin tanımlanma yıllarının zaman çizelgesi

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## Ayrıca bakınız
* Dinozorlar listesi
* Dinozorların evrimi
* Oviraptorosauria
## Dış bağlantılar
* 
* 
## Kaynakça
### Dipnotlar

### Kitap
*