Category: Gnathifera

Belongs within: Ploima. The Synchaetidae are a family of rotifers characterised by a plank-shaped fulcrum, reduced unci, a prominent v-shaped hypopharynx muscle, and stiff sensory setae or palps on the apical field. SynchaetidaeSG06 |–Ploesoma [Ploesomidae]SG06 | |–P. hudsoniSG06 | |–P. sibirica Daday 1901D01 | `–P. truncatusSG06 |–Polyarthra Ehrenberg 1834SG06, R60 | |–P. dolichopteraPH10 | |–P. longiremisPH10… Continue reading Synchaetidae

Belongs within: Gnathifera.Contains: Bdelloida, Acanthocephala, Ploima, Gnesiotrocha. The Syndermata, rotifers and thorny-headed worms, are a clade of animals characterised by their syncytial epidermis (Sørensen & Giribet 2006). Syndermata [Eurotatoria, Rotifera, Rotatoria, Trochata] |–Hemirotifera [Digononta, Lemniscea]SG06 | |–BdelloidaSG06 | `–+–AcanthocephalaSG06 | `–SeisonideaSG06 | |–ParaseisonSG06 | `–SeisonSG06 | |–S. annulatusKF00 | `–S. nebaliaeSG06 `–MonogonontaSG06 | i. s.: EpiphanesSG06 |… Continue reading Syndermata

Belongs within: Syndermata. The Gnesiotrocha are a group of mostly sessile rotifers with malleoramate or uncinate trophi (Sørensen & Giribet 2006). <==Gnesiotrocha [Flosculariacea] |–FlosculariidaeSG06 | |–Floscularia Cuvier 1798R60 | | |–F. conifera (Hudson 1886)R60 | | |–F. mutabilisD01 | | `–F. ringens (Linnaeus 1758) [=Melicerta ringens]R60 | |–Ptygura Ehrenberg 1832SG06, R60 | | |–P. crystallina (Ehrb.… Continue reading Gnesiotrocha

Belongs within: Gnathifera.Contains: Aidanosagitta. Chaetognatha, arrow worms, are small marine animals from 2 to 120 mm in length. Superficially, they are somewhat fish-like, with an elongate body bearing lateral and terminal fins, despite not being closely related to vertebrates. The actual relationships of chaetognaths have long been contentious, and even now have not been firmly… Continue reading Chaetognatha

Belongs within: Acanthocephala.Contains: Rhadinorhynchidae, Illiosentidae. The Palaeoacanthocephala are a group of thorny-headed worms with two muscle layers in the receptacle wall (Monks 2001). Synapomorphies (Monks 2001): Proboscis elongate to fusiform; receptacle wall with two muscle layers; lemnisci attached only at posterior end (free-hanging in body cavity in some taxa); lacunar system lateral; many hypodermic nuclei present (>100); cement… Continue reading Palaeoacanthocephala

Belongs within: Syndermata.Contains: Eoacanthocephala, Palaeoacanthocephala. The Acanthocephala, thorny-headed worms, are a group of parasitic worms that live within the gut of vertebrates, anchored in place by a thorny, protrusible proboscis. Circulatory, reproductive and digestive organs are absent and nutrients are absorbed directly through the body wall (Margulis & Schwartz 1998). <==Acanthocephala [Archiacanthocephala, Oligacanthorhynchidae] |–Oligacanthorhynchus Travassos… Continue reading Acanthocephala