There are several Aranyakas.
The Aitareya Aranyaka forms part of the Aitareya Brahmana, and is attached to the Rig Veda. It has five sections, describing sacrificial rituals and philosophical concepts. It refers to several rishis.
The Kaushitaki Aranyaka is attached to the Kaushitaki Brahmana of the Rig Veda.
The Taittiriya Aranyaka, forming part of the Taittiriya Brahmana is attached to the Krishna Yajur Veda.
The Katha Aranyaka is also attached to the Krishna Yajur Veda.
For the Shukla Yajur veda, there is the Brihadaranyaka, or Brihadaranyaka Upanishad, which actually comes in the category of Upanishads.
For the Sama Veda, the Chhandogya Upanishad has a first section that is similar to an Aranyaka.
Also of the Sama Veda, the Jaiminiya Upanishad Brahmana has the characteristics of an Aranyaka, and contains within it the Kena Upanishad. It is also called the Talavakra Aranyaka.
Thus one can see that the Brahmanas, Aranyakas, and some of the Upanishads are closely connected. But there are many more Upanishads, and we will describe them next.