Secernentea
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 This morphological-based classification system has been replaced by the Modern Phylogeny system, where taxonomy assignment is based on small subunit ribosomal DNA (SSU rDNA).
Secernentea | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Nematoda |
Class: | Secernentea |
Subclasses | |
Diplogasteria (disputed) |
Characteristics of Secernentea are:
- Amphid apertures are pore/slit-like
- Derids are present in some; located near nerve ring
- Phasmids are present; posterior
- Excretory system is tubular
- Cuticle is striated in two to four layers; lateral field is present
- Three esophageal glands; esophageal structure varies
- Males generally have one testis
- Caudal alae are common
- Sensory papillae are cephalic only; may be caudal papillae in males
- Mostly terrestrial
- Rarely found in fresh or marine water
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