File:Dicraeosaurus Kaatedocus Barosaurus cervical vertebrae.png

English: Flagellicaudatan mid- to posterior cervical vertebrae. Mid- to posterior cervical vertebrae of Dicraeosaurus hansemanni MB.R.4886 (A; photo by J Harris), Kaatedocus siberi SMA 0004 (B), and Barosaurus lentus YPM 429 (C) in ventral view (anterior to the top). Note the different developments of the ventral keels (prominent in Dicraeosaurus, A, C132-0; shallow, single in Kaatedocus, B, C132-1 and 175-0; double in Barosaurus, C, C175-1), the ventral sulcus typical for diplodocines (B, C; C133-1), the pneumatic foramina accompanying the ventral keel in Dicraeosaurus (A; C176-1), the posteroventral flanges (C179-1), and the numerous accessory laminae subdividing the prezygapophyseal centrodiapophyseal fossa in Barosaurus (C; C184-2). Vertebrae scaled to same centrum length. Abb: acdl, anterior centrodiapophyseal lamina; CR, cervical rib; di, diapophysis; pap, parapophysis; pcdl, posterior centrodiapophyseal lamina; podl, postzygodiapophyseal lamina; poz, postzygapophysis, prdl, prezygodiapophyseal lamina; prz, prezygapophysis; pvf, posteroventral flange.