Acanthocephala

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

Published
Categorised as Gnathifera

Aidanosagitta

Belongs within: Chaetognatha. On Aidanosagitta Published 26 September 2019 If you’ve ever spent time, as I certainly did back in my undergraduate days, thumbing through textbooks of animal diversity, then you may be familiar with the so-called ‘minor phyla’. These are those isolated subgroups of the animal kingdom that are phylogenetically remote from other such… Continue reading Aidanosagitta

Chaetognatha

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

Published
Categorised as Gnathifera

Bdelloida

Belongs within: Syndermata. Sex and the rotifer Published 30 May 2008 Bethany: I’m sorry. Sex is a joke in heaven?The Metatron: The way I understand it, it generally is down here as well. –Scene from the movie Dogma Nature has an annoying, almost pathological, tendency to break her own rules (I think it may have… Continue reading Bdelloida