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Nematoda

(Phylum)

Overview

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Round worms. Slender, pseudocoelomate, unsegmented worms, circular in cross section. Some (eelworms) are serious parasites of plants, others are parasitic in animals and some are free-living in soil and marine muds.

Nematodes , or roundworms, are very important and found in nearly every ecological niche. There are at least 10,000 species, both free-living in aquatic and terrestrial habitats and as parasitic forms are very successful, found in virtually every type of animal. Nematodes can be carnivorous, herbivorous or parasitic.

The body is always long, slender and tapered at the end and circular in transverse section. A muscular pharynx is required to pump food through the gut since there is no peristalsis. Digestion is in two stages; initially extracellular and then phagocytosis occurs.

Most nematodes are dioecious, and the male nematode is usually smaller than the female. The posterior end of the male is curled like a hook to hold onto the female during copulation.

Photos

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Taxonomy

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The Phylum Nematoda is a member of the Kingdom Animalia. Here is the complete "parentage" of Nematoda:

The Phylum Nematoda is further organized into finer groupings including:

Families

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Acanthocheilidae

[more]

Achromadoridae

[more]

Actinolaimidae

[more]

Acuariidae

Acuariidae is a family of spirurian nematodes. Like all nematodes, they have neither a circulatory nor a respiratory system. They are the only family in superfamily Acuarioidea, and number about 40 genera and 300 species, most of which are parasites of birds.. [more]

Agfidae

Agfa is a genus of parasitic nematodes in the family Agfidae. They are parasiting in land gastropods. [more]

Alaimidae

[more]

Alirhabditidae

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Allantonematidae

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Alloionematidae

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Amidostomatidae

[more]

Anatonchidae

[more]

Ancylostomatidae

[more]

Angiostomatidae

Angiostomatidae' is a family of parasitic nematodes. [more]

Anguillicolidae

[more]

Anguinidae

[more]

Anisakidae

Anisakidae is a family of intestinal roundworms. They are also called the marine ascarids. The larvae of these worms can cause anisakiasis when ingested by humans, but do not reproduce except in marine mammals or seabirds.[] [more]

Anoplostomatidae

[more]

Anticomidae

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Aphelenchidae

[more]

Aphelenchoididae

[more]

Aponchiidae

[more]

Aproctidae

[more]

Araeolaimidae

[more]

Ascarididae

[more]

Ascaridiidae

Ascaridiidae is the name of a family of parasitic nematodes. The family includes roundworms belonging to a single genus Ascaridia. Members are essentially intestinal parasites of gallinaceous birds, including domestic fowl. A. galli is the most prevalent and pathogenic species, especially in domestic fowl. They cause the disease ascaridiasis in birds. [more]

Atractidae

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Atylenchidae

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Aulolaimidae

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Axonolaimidae

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Bastianiidae

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Bathyodontidae

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Belondiridae

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Belonenchidae

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Belonolaimidae

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Brevibuccidae

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Brittonematidae

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Bunonematidae

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Caloosiidae

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Camallanidae

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Campydoridae

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Carabonematidae

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Carcharolaimidae

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Cephalobidae

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Ceramonematidae

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Chambersiellidae

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Choanolaimidae

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Chromadoridae

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Chronogasteridae

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Cloacinidae

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Cobbonchidae

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Comesomatidae

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Cooperiidae

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Cosmocercidae

Cosmocercidae is a nematode family in the super family Cosmoceroidea. [more]

Creagrocercidae

[more]

Criconematidae

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Crossophoridae

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Cucullanidae

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Cyatholaimidae

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Cylindrocorporidae

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Cystidicolidae

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Cystoopsidae

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Desmodoridae

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Desmoscolecidae

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Diaphanocephalidae

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Dictyocaulidae

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Dioctophymatidae

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Diphtherophoridae

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Diplogasteridae

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Diplogasteroididae

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Diplopeltidae

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Discolaimidae

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Dolichodoridae

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Dorylaimidae

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Draconematidae

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Dracunculidae

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Drilonematidae

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Ecphyadophoridae

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Elaphonematidae

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Encholaimidae

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Enoplidae

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Epsilonematidae

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Ethmolaimidae

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Eurystominidae

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Fergusobiidae

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Filariidae

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Globocephalidae

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Gnathostomatidae

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Goeziidae

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Greeffiellidae

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Halaphanolaimidae

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Haliplectidae

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Hedruridae

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Heligosomatidae

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Hemicycliophoridae

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Heterakidae

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Heterocheilidae

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Heteroderidae

Heteroderidae is a family of nematodes. [more]

Heterohabditidae

[more]

Heterorhabditidae

[more]

Homungellidae

[more]

Hoplolaimidae

Hoplolaimidae is a family of plant pathogenic nematodes. It has two subfamilies, Hoplolaiminae and Rotylenchulinae. Typically hoplolaimids are ecto- or semi endoparasites of higher plants. [more]

Hypodontolaimidae

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Iotonchiidae

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Iotonchusidae

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Ironidae

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Isolaimiidae

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Kathlaniidae

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Lauratonematidae

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Leptolaimidae

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Leptonchidae

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Leptosomatidae

The Cuckoo Roller (Leptosomus discolor) is the only bird in the family Leptosomatidae, which is usually considered to be within the order Coraciiformes, which also includes the kingfishers, bee-eaters and rollers. However, the position of this family is not very clear. Morphological evidence may suggest a placement within or near to Falconiformes. In the rather comprehensive DNA study by Hackett et al. this is one of only two birds ? besides the Hoatzin ? of which the position is not clear, although it seems to be at the root of a group that contains the Trogoniformes, Bucerotiformes, Piciformes and Coraciiformes. [more]

Linhomoeidae

[more]

Longidoridae

[more]

Maupasinidae

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Meloidogynidae

[more]

Mermithidae

Mermithidae is a family of nematode worms that are endoparasites in arthropods. As early as 1877, Mermithidae was listed as one of nine subdivisions of the Nematoidea. Mermithidae are confusable with the horsehair worms of the phylum Nematomorpha that have a similar life history and appearance. [more]

Mesidionematidae

[more]

Metastrongylidae

Metastrongylidae is a family of nematodes. [more]

Meyliidae

[more]

Microlaimidae

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Micropleuridae

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Monhysteridae

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Mononchidae

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Mononchulidae

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Monoposthiidae

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Muspiceidae

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Mydonomidae

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Myenchidae

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Myolaimidae

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Neodiplogasteridae

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Neotylenchidae

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Nygolaimellidae

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Nygolaimidae

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Odontopharyngidae

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Odontorhabditidae

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Ollulanidae

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Oncholaimidae

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Onchulidae

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Opailaimidae

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Osstellidae

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Oxydiridae

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Oxystominidae

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Oxyuridae

Oxyuridae is an family of nematode worms of the class secernentea. It consists of eight genera, one of which contains the human pinworm (Enterobius vermicularis). [more]

Panagrolaimidae

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Pangrolaimidae

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Paraphelenchidae

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Parasitylenchidae

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Paratylenchidae

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Paroxystominidae

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Paurodontidae

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Phanodermatidae

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Philometridae

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Phlyctainophoridae

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Physalopteridae

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Plectidae

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Pratylenchidae

Pratylenchidae is a family of plant pathogenic nematodes. [more]

Prismatolaimidae

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Prochaetosomatidae

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Pseudaliidae

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Pseudodiplogasteroididae

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Psilenchidae

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Pterygorhabditidae

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Quimperiidae

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Rhabdiasidae

[more]

Rhabditidae

Rhabditidae is a family of nematodes. [more]

Rhabditonematidae

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Rhabdolaimidae

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Rhigonematidae

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Richtersiidae

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Robertdollfusidae

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Roqueidae

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Rotylenchulidae

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Scaptrellidae

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Schneidernematidae

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Scolecophilidae

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Selachinematidae

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Setariidae

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Seuratidae

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Siphonolaimidae

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Soboliphymatidae

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Sphaerolaimidae

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Sphaeronematidae

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Sphaerulariidae

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Spirinidae

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Spiruridae

Spiruridae is family of nematodes in the order Spirurida. An unidentified parasitic larval member of this family has been recorded in the marsh rice rat (Oryzomys palustris) in a salt marsh at Cedar Key, Florida, and also in fiddler crabs (Uca) there; it is perhaps a bird parasite that does not reach maturity in the rice rat. [more]

Steinernematidae

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Strongylacanthidae

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Strongylidae

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Strongyloididae

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Subuluridae

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Sychnotylenchidae

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Symplocostomatidae

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Syngamidae

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Syrphonematidae

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Telotylenchidae

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Teratocephalidae

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Tetradonematidae

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Tetrameridae

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Thelastomatidae

[more]

Thelaziidae

Thelaziidae is a family of spirurian nematodes, which form the mid-sized lineage of the superfamily Thelazioidea. Like all nematodes, they have neither a circulatory nor a respiratory system. [more]

Thoracostomopsidae

[more]

Tobrilidae

[more]

Toxocaridae

Toxocaridae is a zoonotic family of parasitic nematodes that infect canids and felids and which cause toxocariasis in humans (visceral larva migrans and ocular larva migrans). The worms are unable to reproduce in humans. [more]

Trachypleurosidae

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Trefusiidae

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Trichinellidae

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Trichodoridae

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Trichostrongylidae

[more]

Trichuridae

The roundworm family Trichuridae includes the type genus Trichuris and some less widely known members. They are (after the abolishment of the artificial "Adenophorea" assemblage) placed in subclass of the class Enoplea; however, the former might be better treated as a class in its own right. That nonwithstanding, their order (Trichocephalida) has been known under alternate names in the past, namely Trichiurida. [more]

Triodontolaimidae

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Tripylidae

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Tripyloididae

[more]

Tylenchidae

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Tylencholaimellidae

[more]

Tylenchulidae

[more]

Tylodoridae

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Tylopharyngidae

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Uncinariidae

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Ungellidae

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Xennellidae

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Xyalinidae

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At least 17 species and subspecies belong to the Family Xyalinidae.

More info about the Family Xyalinidae may be found here.

Sources

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Last Revised: August 25, 2014
2014/08/25 12:33:23