In what order does the Akatsuki capture the Tailed Beasts? In Episode 83, two or three episodes after Hidan and Kakuzu capture the Two Tails, Nagato says that only 4 beasts are left. But in the anime, only two beasts were shown to be captured (Shukaku and the Two Tails). So 7 beasts remain. Are there any movies in between or did I miss any episode?
Timeline as figured by me
1.Kokuo(Han) was captured BEFORE shipuuden start

Kokuō, after living in an unspecified forest, eventually fell into the possession of Iwagakure and was sealed into Han, but was captured and extracted by Akatsuki.

2.Gyuki was captured BEFORE shipuuden starts

In the anime, during a joint Chūnin Exams between Konohagakure and Sunagakure, Fū attempted to stop the Suna-nin Hōichi from extracting Shukaku from its host Gaara. Her failed attempt caused her to draw the attention of Hōichi, who also began extracting Chōmei from Fū.[6] Ultimately, the extraction was stopped by the intervention of Neji Hyūga, who used his Gentle Fist to block the chakra points from which Chōmei was being extracted, thereby repelling the chains.[7] Fū was later captured by Akatsuki members Kakuzu and Hidan, leading to Chōmei being extracted from its jinchūriki and sealed within the Demonic Statue of the Outer Path.[8]

Shipuuden Starts
3.Deidara (and Sasori) capture Shukaku (Gaara) - Naruto Returns

During Gaara's time as the Fifth Kazekage, Deidara and Sasori from the Akatsuki were assigned to capture Shukaku.

4.Hidan and Kakuzu capture Matatabi (Yugito) - Akatsuki Suppression; Asuma Dies

Soon after her introduction, Yugito was captured by two Akatsuki members, Hidan and Kakuzu.

5.Tobi and Deidara capture Isubo the three tails - Naruto starts his wind training

In the manga, Tobi and Deidara confronted the beast around the same time Naruto Uzumaki had begun his Wind Release training, to which it responded by beginning to chase Tobi. With the Three-Tails distracted, Deidara moulded an explosive clay fish in an attempt to capture it. This was a filler arc in the Anime, wherein Leaf tried to capture the beast and failed

6.Kisame capture Son Goku(Roshi) - Itachi is pursued; Sasuke Vs Deidara

After an unseen and difficult battle with Kisame Hoshigaki, Rōshi was defeated and captured by the Akatsuki member

7.Anime only: Saiken (Utakata) is captured by Pain

In the anime, in an attempt to stop the Fury technique from causing untold destruction, Utakata went into his full Six-Tails form to shield the blast. Later, Utakata was confronted and captured by Nagato's Six Paths of Pain. Afterwards, Saiken was extracted from Utakata's body, being sealed into the Demonic Statue of the Outer Path, thus killing the jinchūriki in the process.
So 2 beasts were captured before anime started. The 4th Mizukage's beast was roaming alone for some reason and Utakata's beast I am not sure about. In Anime, its shown after Roshi, need a rewatch to confirm. As I remember Utakata was captured while Sasuke fought Itachi and Jiraiya, Pain.

8.9.Gyuki and Kurama capture failed by Kisame and Pain.
EDIT: Added relevant quotes for all the beasts from the wikia (Source)