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Topic: Heterotardigrada

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Mesotardigrada

Eutardigrada

Tardigrada

Species

Scientific classification

Burgess Shale

Temperature

Animal

Cretaceous

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	Reinhardt Møbjerg Kristensen
		Kristensen, R.M. On the marine genus Styraconyx (Tardigrada, Heterotardigrada, Halechiniscidae) with description of a new species from a warm spring on Disco Island, West Greenland.
		Kristensen, R.M. Generic revision of the Echiniscidae (Heterotardigrada) with a discussion of the origin of the family.
		Jørgensen, A and Kristensen, R.M. : Molecular phylogeny of Tardigrada — investigation of the monophyly of Heterotardigrada.
	www.zmuc.dk /InverWeb/staff/Reinhardt_M_Kristensen/rmk_pub.htm (2314 words)

	Tardigrada
		Phylogeny of the genera of the Stygarctidae and related families (Tardigrada: Heterotardigrada).
		Adaptive radiation and phylogenesis in marine Tardigrada and the establishment of Neostygarctidae, a new family of Heterotardigrada.
		Molecular phylogeny of Tardigrada?investigation of the monophyly of Heterotardigrada.
	tolweb.org /tree?group=Tardigrada&contgroup=Bilateria (619 words)

	Integrative and Comparative Biology: Current status of the tardigrada: Evolution and ecology (Site not responding. Last check: 2007-10-08)
		Heterotardigrada of the Amendolara Shoal, High Ionian Sea.
		The brain of Echiniscus viridissimus Peterfi, 1956 (Heterotardigrada): A key to understanding the phylogenetic position of tardigrades and the evolution of the arthropod head.
		Kristensen, R. Generic revision of the Echiniscidae (Heterotardigrada), with a discussion of the origin of the family.
	www.findarticles.com /p/articles/mi_qa4054/is_200206/ai_n9119144/pg_2 (931 words)

	Palaeos Invertebrates : Invertebrates : Arthropoda : Tardigrada
		In Heterotardigrada, gonoducts open to the outside through a preanal gonopore.
		Males possess two vas deferentia, a swollen portion serving as a seminal vesicle.
		Heterotardigrada: Head with anterior cirri and lateral filaments, four separate but similar claws on each leg.
	www.palaeos.com /Invertebrates/Arthropods/Tardigrada/Tardigrada.html (1206 words)

	Integrative and Comparative Biology: Current status of the tardigrada: Evolution and ecology (Site not responding. Last check: 2007-10-08)
		The two main classes are separated on the basis of taxonomic characters of the claws and/or sucking disks, cuticle, cephalic appendages, buccal apparatus, and reproductive structures.
		The class Heterotardigrada is characterized by the presence of cephalic, trunk and leg appendages; gonopore separated from anus; Malpighian tubules lacking; placoids consisting of three CaCO^sub 3^ elements or three delicate, bar-shaped cuticular structures (Ramazzotti and Maucci, 1983; Kristensen, 1987).
		In contrast, the class Eutardigrada has cephalic papillae only in the Apochela (non-homologous to the cephalic appendages in heterotardigrades); gonopore and anus combined to form a cloaca; Malpighian tubules present; placoids consisting of three sets of thickened cuticular structures (Ramazzotti and Maucci, 1983; Schuster et al., 1980; Guidi and Rebecchi, 1996; and others).
	www.zoeticzone.com /p/articles/mi_qa4054/is_200206/ai_n9119144 (1209 words)

	Tardigrader (Site not responding. Last check: 2007-10-08)
		The marine species have generally a rather elaborated morphology with various appendages.
		The limno-terrestrial species are classified into two groups; Heterotardigrada and Eutardigrada.
		In the heterotardigrades, which includes the genus Echiniscus, the body is covered with sclerotizised plates and the head is equipped with two anterior cirri.
	www.nrm.se /ev/research/tard.html.en (329 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		Identification to Tardigrada can be based on size, body shape and the presence of four pairs of short, unjointed legs with one or more terminal claws or pegs or toe-like adhesive disks.
		Heterotardigrada carry tentacles or antennae on the head, and Oreelidae have four smooth claws on each leg while Echiniscidae have heavily sculptured dorsal plates and either some claws with a spur or else some legs with other than four claws.
		There are four claws on each leg, but in Milnesiidae each leg is divided at its base into two parts, while in Macrobiotidae the legs are not divided.
	www.lucidcentral.com /keys/lwrrdc/public/Aquatics/abflat/html/TARDI.htm (286 words)

	Untitled Document (Site not responding. Last check: 2007-10-08)
		Pollock, L. W., New marine tardigrades from Hawaiian beach sand and phylogeny of the family Halechiniscidae.
		Pollock, L. W., Marine interstitial Heterotardigrada from the Pacific Coast of the United States, including a description of Batillipes tridentatus n.
		Pollock, L. W., Observations on marine Heterotardigrada including a new genus from the western Atlantic Ocean.
	www.users.drew.edu /lpollock/Publications.htm (284 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		In this state, they can survive extreme temperatures, as low as -253 C or as high as 151 C, as well as exposure to a vaccuum or to X-rays.
		We have now tested the ability of the tardigrades Macrobiotus occidentalis (order Eutardigrada) and Echiniscus japonicus (Heterotardigrada) to survive under extraordinarily high hydrostatic pressures.
		We sealed M. occidentalis tardigrades in a small plastic container (6 ml) placed inside a pressure capsule (R7K-3-10, Yamamoto Suiatu Kougyoucho) and compressed using water as the pressure medium.
	keithlynch.net /cryonet/108/40.html (1171 words)

	tardigrade congruence (Site not responding. Last check: 2007-10-08)
		Tardigrada: connective between protocerebrum and ganglion of first pair of legs (Dewel and Dewel 1997).
		Heterotardigrada: Cephalic appendages, legs with digits and/or claws (Barnes and Harrison 1993).
		Eutardigrada: Lack of cephalic appendages; legs with claws but not digits (Barnes and Harrison 1993).
	chuma.cas.usf.edu /~garey/tard2.html (388 words)

	Phylum Tardigrada summary for Zoology 6207, Spring 1982, WR Elsberry (Site not responding. Last check: 2007-10-08)
		Order Milnesiidae: Sucking pharynx without macroplacoids, mouth surrounded hy six papillae.
		Class Heterotardigrada: Head with anterior cirri and lateral filaments, four separate but similar claws on each leg.
		Order Echiniscoidea: Stout posterior legs not set off by cuticular folds.
	www.rtis.com /nat/user/elsberry/taxa/tardigra.html (896 words)

	Lab 3 – Ecdysozoa (7 phyla)
		In such a state, Tardigrades can survive for many years and hence escape death due to desiccation.
		Classification: The Tradigrada is divided in one subphylum Pentastomida, and three orders Eutardigrada, Heterotardigrada, and Mesotardigrada.
		Morphology: Tardigrades are less than 1 mm in size and have segmented bodies with four pairs of un-jointed limbs like Onychophora.
	userwww.sfsu.edu /~efc/classes/biol170/lab/Laboratory-3.htm (940 words)

	The Tardigrade Animations' Gallery
		They show strange, jelly-like body fluid and a perfectly controlled
		The Echiniscus water bears belong to the order of the Heterotardigrada, i.e.
		They bear body appendices which are called filaments, feelers, 'hairs' or thorns.
	www.baertierchen.de /echiniscus_e.html (398 words)

	Zoologischer Anzeiger - Volume 240
		and Redescription of Antechiniscus parvisentus (Horning & Schuster, 1983) (Heterotardigrada: Echiniscidae) 281
		GREVEN, H. Some Aspects of Spermiogenesis and Spermatozoan Ultrastructure in Echiniscoides sigismundi (Heterotardigrada: Echiniscoididae)
		GALLO DADDABBO, M., DE ZIO GRIMALDI, S. Heterotardigrada of Two Submarine Caves in S. Domino Island (Tremiti Islands) in the Mediterranean Sea with the Description of Two New Species of Stygarctidae
	www.manuscript-submission.de /journals/index.php?id_journal=237&volume=240 (770 words)

	Content of database E:\WWW_DA~1\PORTAL\ALL_TAXA.DBF (project "ZOOINT_R") - part 4
		Echiniscoididae * TARDIGRADA * HETEROTARDIGRADA * Echiniscoididae * CNAMF * Echiniscoididae *
		Echiniscoides sigismundi * TARDIGRADA * HETEROTARDIGRADA * Echiniscoididae * CNAMF * sigismundi *
		Echiniscoides sigismundi sigismundi * TARDIGRADA * HETEROTARDIGRADA * Echiniscoididae * CNAMF * sigismundi *
	www.zin.ru /projects/zooint_r/alltaxa4.htm (20843 words)

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