Heterotardigrades (Heterotardigrada) is a class that includes tardigrades (water bears) that have cephalic appendages and legs with four separate but similar digits or claws on each. 444 species have been described.[1]
Heterotardigrada
Echiniscus succineus under PCM (left) and SEM (right)
The anatomy of the reproductive system is an important defining feature in distinguishing the different groups of tardigrades. Heterotardigrades have gonoducts that open to the outside through a preanal gonopore, rather than opening into the rectum as in the only other confirmed class of tardigrades, the Eutardigrada. The third class, Mesotardigrada, is represented by a single species known from a single specimen that is now lost, and the location from which that specimen was collected has since been destroyed by an earthquake, so its reproductive anatomy has not been studied recently.
Ecologyedit
Some orders of heterotardigrades are marine, others are terrestrial, but as for all tardigrades, all are aquatic in the sense that they must be surrounded by at least a film of moisture in order to be active – though they can survive in a dormant state if the habitat dries out.
Referencesedit
^Zhang, Z.-Q. (2011). "Animal biodiversity: An introduction to higher-level classification and taxonomic richness" (PDF). Zootaxa. 3148: 7–12. doi:10.11646/zootaxa.3148.1.3.
External linksedit
Wikimedia Commons has media related to Heterotardigrada.
Wikispecies has information related to Heterotardigrada.
heterotardigrada, heterotardigrades, class, that, includes, tardigrades, water, bears, that, have, cephalic, appendages, legs, with, four, separate, similar, digits, claws, each, species, have, been, described, echiniscus, succineus, under, left, right, scient. Heterotardigrades Heterotardigrada is a class that includes tardigrades water bears that have cephalic appendages and legs with four separate but similar digits or claws on each 444 species have been described 1 Heterotardigrada Echiniscus succineus under PCM left and SEM right Scientific classification Domain Eukaryota Kingdom Animalia Phylum Tardigrada Class HeterotardigradaMarcus 1927 Families Order Arthrotardigrada Archechiniscidae Batillipedidae Coronarctidae Halechiniscidae Neoarctidae Neostygarctidae Renaudarctidae Stygarctidae Styraconyxidae Tanarctidae Order Echiniscoidea Carphaniidae Echiniscidae Echiniscoididae Oreellidae Contents 1 Anatomy 2 Ecology 3 References 4 External linksAnatomy editThe anatomy of the reproductive system is an important defining feature in distinguishing the different groups of tardigrades Heterotardigrades have gonoducts that open to the outside through a preanal gonopore rather than opening into the rectum as in the only other confirmed class of tardigrades the Eutardigrada The third class Mesotardigrada is represented by a single species known from a single specimen that is now lost and the location from which that specimen was collected has since been destroyed by an earthquake so its reproductive anatomy has not been studied recently Ecology editSome orders of heterotardigrades are marine others are terrestrial but as for all tardigrades all are aquatic in the sense that they must be surrounded by at least a film of moisture in order to be active though they can survive in a dormant state if the habitat dries out References edit Zhang Z Q 2011 Animal biodiversity An introduction to higher level classification and taxonomic richness PDF Zootaxa 3148 7 12 doi 10 11646 zootaxa 3148 1 3 External links edit nbsp Wikimedia Commons has media related to Heterotardigrada nbsp Wikispecies has information related to Heterotardigrada Heterotardigrada Integrated Taxonomic Information System Arthrotardigrada Integrated Taxonomic Information System Echiniscoidea Integrated Taxonomic Information System Retrieved from https en wikipedia org w index php title Heterotardigrada amp oldid 1218239024, wikipedia, wiki, book, books, library,
