cephalic suture In trilobites (Trilobita), the structure that includes the facial and ventral cephalic sutures. The facial sutures situated on the dorsal part of the cephalon are of three main types: protoparian, where the suture runs from the anterior border of the cephalon to a position anterior to the genal angle; opisthoparian, where the suture runs from the anterior margin to cut the posterior margin posterior to the genal angle; and marginal, where the suture runs along the edge and is not visible on the upper surface. In one family the facial suture runs directly through the genal angle and is ‘gonatoparian’. On the ventral side of the cephalon the facial sutures are joined and continue as the ventral cephalic suture. An elongated rostral plate (see ROSTRUM) in the anterior mid-line of the ventral surface has a rostral suture anterior to it and a hypostomal suture posterior to it. In some genera the lateral ventral sutures are combined as a single median suture.
More From encyclopedia.com
Potentiometric Surface , Skip to main content potentiometric surface Erosion Surface , erosion surface 1. (planation surface) Gently undulating land surface that cuts indiscriminately across underlying geologic structures and that is th… -drome , -drome • comb. form 1. denoting a place for running or racing: velodrome. 2. denoting something that runs or proceeds in a certain way: palindrome. -… Mobius Strip , Mobius strip Möbius strip A Möbius strip is a twisted surface in space that is made by starting with a strip of paper, twisting one end through 180°,… Dorsal , dorsal •hassle, Kassel, passel, tassel, vassal •axel, axle •cancel, hansel, Hänsel, Mansell •transaxle •castle, metatarsal, parcel, tarsal •chancel •… Running , Running RUNNING. Before bicycles and cars made transportation fast and easy, running was one of the only ways for a human being to move rapidly. Acco…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like