[Previous Taxon] [Next Taxon] [Down Button] [Deep Button] [Tree] [Table of Contents] [Bottom of Page] [Under Construction]


     === Diplogasterida 
     === Tylenchida 
Maggenti, 1991

Containing clade(s): Secernentea

Table of Contents



Mostly small to medium sized nematodes, seldom exceeding 3-4 mm. The cuticle is ornamented by annuli that are sometimes transversed by longitudinal striae; the cuticle may be punctated. The labia may be well developed but hexaradiate symmetry is almost always evident. The full complement of cephalic sensilla is often present, especially on males. In derived taxa the inner circle of six sensilla may be lacking. In the external circle of 10 sensilla the externolaterals are ventrolateral on the lateral labia. The amphids, when labia are evident, are located dorsolaterally on the lateral lips and the aperatures are porelike, small ovals, silts, or clefts. In some larval forms, particularly dauerlarvae, the amphids may be postlabial. The variable stoma is primarily composed of cheilostomal tissue and is most often armed. Except for rare instances, moveable stomatal armature in the form of large teeth, opposable fossores, or axial spears is limited to the subclass. The esophagus has a muscular corpus divided into an almost cylindrical procorpus and a muscular, almost always valved, meta corpus followed by an isthmus and a glandular postcorpus. A valve is never present in the postcorporal bulb. Females have one or two ovaries and males have one testis. Males have paired spicules but may or may not have a gubernaculum or caudal alae (Maggenti, 1991).


Maggenti, A.R. 1991. Nemata:  higher classification. In:  Manual 
          of Agricultural Nematology, W.R. Nickle [ed.]. Marcel 
          Dekker, Inc., New York.

About this page

Page constructed by Marcella Shaver-Adams, madams@unlgrad1.unl.edu.

Correspondence regarding this page should be directed to Tom Powers, at tpowers@unlinfo2.unl.edu.

Page copyright © 1997 Tom Powers and the Society of Nematology Systematics Resources Committee

Last saved 14 July 1997

[Tree Help] [Tree of Life Home Page] [Tree of Life Root] [Express Page] [Top of Page]
Tree of Life design and icons copyright © 1996 David Maddison and Wayne Maddison.