Nematodes belonging to the Heterakidae family are similar in appearance and their identification causes certain difficulties. For this reason, there is a need define new taxonomic characteristics. On other hand, despite fact that nematode Heterakis dispar Schrank, 1790, included same family, has wide distribution area, little information about ultrastructure of parasite. Research on reproductiv...

The hemizonid (6) is a ventro-lateral, commissure (7) which extends around the ventral side of nematodes between the hypodermis and the cuticle, stopping at the lateral fields (2, 4, 6, 8). Although the hemizonid has been recorded mainly from plant parasitic nematodes (1,4, 6, 7, 8), Timm (11) reported its presence in a wide variety of nematodes and suggested that it may be present t h r o u g ...

Seventeen saccharides were tested for their ability to bind to the trap lectins of three species of nematode-trapping fungi and prevent nematode capture. The lectin of Arthrobotrys conoides was found to be inhibited by alpha-d-glucose/d-mannose and similar saccharides. The lectins of Monacrosporium eudermatum and Monacrosporium rutgeriensis were inhibited by alpha-l-fucose and 2-deoxy-d-glucose...

Syphacia caudibandata was found in the gut of the common hare Lepus capensis (Linn.) in Karachi, Pakistan. The new species is characterized by having a typical caudal region provided with transverse band and bead like structures placed at wellproportioned spaces in the females and one or two cuticular mamelons and relatively short spicules in males. Scanning micrographs of the cuticle show a ty...

Transmission of Corynebacterium insidiosum (McCull.) Jensen (cause of bacterial wilt in alfalfa) by the stem and bulb nematode Ditylenchus dipsaci (Kiihn) was demonstrated by Hawn (3) . Disease development in plants where D. dipsaci was the vector was comparable to that in the controls where wilt was induced by the root-ball soak method devised by Cormack, Peake and Downey (1) . Furthermore, th...

The mermithid nematode, Filipjevimermis leipsandra, was successfully cultivated to the preadult stage in Schneider's Drosophila medium supplemented with 20% fetal bovine serum. Upon transfer to a solid substrate the preadults continued to develop into ovipositing adult females. Four molts were observed. The first molt occurred in the egg. The second occurred after 6-8 days in culture during whi...

Contrary to textbook dogma, nematodes are not only highly diverse, but often also complex and biologically specialized metazoans. Just a few of the many fascinating adaptations are reviewed in this chapter, as a prelude to a quick tour through phylogenetic relationships within the phylum. Small Subunit rDNA sequences have confirmed several controversial prior hypotheses, as well as revealing so...

A characteristic posture is considered one of the behavioral hallmarks of sleep, and typically includes functional features such as support for the limbs and shielding of sensory organs. The nematode C. elegans exhibits a sleep-like state during a stage termed lethargus, which precedes ecdysis at the transition between larval stages. A hockey-stick-like posture is commonly observed during letha...

1. Spear robust, lumen wide ...................................... _. p a t u l i h a s t u s Goseco, Ferris and Ferris, 1974 Spear slender, lumen narrow .................................... 2 2. Tail longer (c = 38.6-62.5); ventromedian supplements closely spaced ........................................... ......................................... t r a n s v a a l e n s i s Heyns, 1963 Tail s...

Epithelial cell shape changes underlie important events in animal development. During the postembryonic life of the nematode Caenorhabditis elegans, stem epidermal seam cells lose and actively renew mutual adherens junction contacts after each asymmetric division that separates them. The seam cell contacts are important for epidermal differentiation, but what regulates the cell-shape changes th...