Diagram of the diapsid skull with temporal openings, unlike in anapsids. The name Diapsida means "two arches", and diapsids are traditionally classified based on their two ancestral skull openings (temporal fenestrae) posteriorly above and below the eye.

雙孔亞綱（Diapsida）也作双弓亚纲，是群頭骨兩側各有兩個顳顬孔的四足動物，首次出現於三億年前的石炭紀晚期 [1] 。 現存的雙孔動物非常多樣化，包括：鳥類、鱷魚、烏龜、蜥蜴、蛇、喙頭蜥。 有些失去一個顳顬孔（蜥蜴），有些失去兩個（蛇），某些物種甚至大幅特化的頭骨（現代鳥 …

The main diagnostic physical character for a diapsid is the presence of two openings on each side of the skull; the upper and lower temporal openings, i.e., the post-orbital fenestrae (right).

双孔亚纲是主干的爬行动物，在最初的爬行动物登场后不久就已经出现，虽然不是主要的爬行动物，但是随后一直成为爬行动物中占绝对优势的类群。鳞龙下纲是双孔亚纲中的原始类型，是出现于石炭纪晚期的第一批爬行动物之一，也是后来出现的各类新兴爬行动物的祖先。鳞龙下纲直到现代 …

Other articles where diapsid is discussed: reptile: Fossil distribution: …of the Mesozoic Era are diapsids. One of the most-recognizable groups of diapsids is the lepidosauromorphs. This lineage, which is ancestral to today’s tuatara and squamates (lizards and snakes), appeared first during the Late Permian.

Diapsid diversity: Diapsids, as generally conceived, are an apomorphy-based group - the sauropsids that ancestrally possess the diapsid pattern of temporal fenestration, They were among the first groups to be studied with the methods of cladistics (See Gauthier, 1984 and …

The main diagnostic physical character for a diapsid is the presence of two openings on each side of the skull; the upper and lower temporal openings. Even the birds are considered diapsids (and hence reptiles), because they are descended from certain dinosaurs (which are also diapsids), and ancestrally have the paired skull openings along with ...

Aside from turtles, diapsid reptiles comprise archosaurs, lepidosaurs, and their closest extinct relatives. In addition to the two temporal openings, diapsids also share the presence of a large opening in the bony palate, the suborbital fenestra (Rieppel, 1993).

Diapsid phylogeny has been intensively studied in the last decade, but the affinities of many groups are still controversial. For instance, the affinities of the Upper Permian diapsids Galesphyrus (Carroll, 1976a), Heleosaurus (Carroll, 1976b), and Heleosuchus (Carroll, 1987) from South Africa are uncertain because these taxa are represented by ...

diapsid，英语单词，主要用作名词、形容词，作名词时译为“无孔类爬行动物”，作形容词时译为“无孔类爬行动物的；具双窝的，双窝型的”。 [1] 外文名