侧尾腺纲纲

分类

胞管肾纲之下的纲目计有：

双胃亚纲 Diplogasteria：亦作双胃线虫亚纲，可能与Rhabditia为并系群

• 双胃目 Diplogasterida
• 小杆亚纲 Rhabditia：可能为并系群
• 小杆目 Rhabditda：秀丽隐杆线虫
• 圆线虫目 Strongylida：亦作园线目，例如：广东住血线虫
• 旋尾亚纲 Spiruria
• 蛔目 Ascaridida：海兽胃线虫
• 驼形目 Camallanida：有时被归入旋尾目
• 蚓线目 Drilonematida：有时被归入旋尾目
• 尖尾目 Oxyurida：蛲虫
• Rhigonematida目：旧属垫刃亚纲
• 旋尾目 Spirurida：麦地那龙线虫

垫刃亚纲 Tylenchia：可能与Rhabditia为并系群，其下两个目的分类单元在2011年合并成为垫刃下目（Tylenchomorpha）

滑刃目 Aphelenchida

垫刃目 Tylenchida

Secernentea was a class of nematodes in the Classical Phylogeny System (Chitwood, 1958) and is no longer in use. This morphological-based classification system has been replaced by the Modern Phylogeny system, where taxonomy assignment is based on small subunit ribosomal DNA (SSU rDNA).

Description

Amphid apertures of Secernenteas are pore or slit-like.

Some Secernenteas have deirids which are located near nerve ring.

Secernenteas have posterior phasmids.

The excretory system of a Secernentea is tubular.

Cuticles of Secernenteas are striated in two to four layers. Lateral field is present.

Secernenteas have three esophageal glands. Their esophageal structure varies.

Male Secernenteas generally have one testis.

Caudal alae are common in Secernenteas.

Sensory papillae of Secernenteas are cephalic only. It might be caudal papillae in male Secernenteas.

Secernenteas are mostly found in land but they are rarely found in marine water or freshwater.

Taxonomy

• Subclasses and orders of Secernentea are:
• Subclass Rhabditia (paraphyletic?)
• Rhabditida
• Strongylida
• Subclass Spiruria
• Ascaridida
• Camallanida (sometimes included in Spirurida)
• Drilonematida (sometimes included in Spirurida)
• Oxyurida (= Rhabdiasida)
• Rhigonematida (formerly in Tylenchia)
• Spirurida
• Subclass Diplogasteria (may belong in Rhabditia)
• Diplogasterida
• Subclass Tylenchia (may belong in Rhabditia)
• Aphelenchida
• Tylenchida

Some families traditionally considered to be Rhabditida seem to be closer to the Tylenchida. If the Tylenchia are to be maintained as separate, they probably will be included therein.