SIX Phylum ARTHROPODA chelicerata horseshoe crabs, arachnids, sea spiders PHILIP J. SIRVID, ZHI-QIANG ZHANG, MARK S. HARVEY, BIRGIT E. RHODE, DAVID R. COOK, ILSE BARTSCH, DAVID A. STAPLES C Uliodon sp., an unidentified zoropsid spider from Palmerston North. Alastair Robertson and Maria Minor, Massey University 50 helicerates comprise three distinctive groups of creatures – horseshoe crabs (class Xiphosura), spiders, mites, and kin (class Arachnida), and the sea spiders (class Pycnogonida). In contrast with hexapods, which have three body sections, chelicerates have only two. The head and thorax are fused into a single unit, the cephalothorax or prosoma (Latin pro, forward; Greek soma, body), and there is a hind-body or abdomen, which is usually referred to as the opisthosoma (Greek opisthen, behind). Chelicerates are the only arthropods to lack antennae and they have fangs or pincers (the first pair of appendages) instead of mandibles. They also differ from crustaceans and insects in having no compound eyes, only simple ones. Members of this ancient arthropod group also possess pedipalps, a second pair of appendages near the mouth. These vary in different groups but are usually used to manipulate food. The prosoma has six or more fused segments, with at least six pairs of appendages including four pairs of legs. The abdomen lacks legs but may contain such specialised features as book gills or book lungs (pages of respiratory flaps), a telson (a long spike for balance), spinnerets (in spiders and some other arachnids for spinning silk), or a sting (in scorpions), apparently a modified telson). Chelicerates include in their number both the tiniest (mites) and largest (extinct eurypterids) of all Arthropoda. Eurypterid (sea scorpion) fossils have not yet been found in New Zealand. Nor are there fossil or living representatives of the Xiphosura. Xiphosurans (the so-called horseshoe crabs) are the most primitive living chelicerates. They are often referred to as‘living fossils’because they have changed so little in appearance from the earliest forms in the Cambrian period. No one can say with certainty why they have been able, with no ‘modern improvements’, to survive in competition with more highly developed arthropods. Perhaps their success results in part from a combination of unobtrusive habits and a heavy hoodlike carapace that forms a protective roof over the body and limbs. As archaic forms they give evidence of what the ancestral aquatic arachnid may have been like, with five pairs of walking legs, book gills, and a long spike-like telson. Living horseshoe crabs (family Limulidae) live in shallow sandy coastal areas of the eastern seaboard of the Atlantic from Nova Scotia to the Gulf of Mexico (genus Limulus) or along Asian coasts from Japan and Korea south through the Philippines and Southeast Asia to India (Tachypleus and Carcinoscorpius). Although New Zealand lacks living horseshoe crabs in its fauna, there have nevertheless been two records of accidental live introductions. In 1908, a biologist found on the stone facing of Calliope Dock, Auckland Harbour, a specimen of NEW ZEALAND INVENTORY OF BIODIVERSITY Authors Dr Ilse Bartsch Forschungsinstitut Senckenberg, Notkestrasse 85, D-22607 Frankfurt, Germany [[email protected]] marine mites Dr David R. Cook 7836 North Invergordon Place, Paradise Valley, Arizona 85253, USA [[email protected]] water mites Dr Mark S. Harvey Department of Terrestrial Zoology, Western Australian Museum, Locked Bag 49, Welshpool DC, WA 6986, Australia [[email protected]] water mites, pseudoscorpions Dr Birgit E. Rhode Landcare Research, Private Bag 92-170, Auckland, New Zealand [[email protected]] mites and ticks Philip J. Sirvid Museum of New Zealand Te Papa Tongarewa, PO Box 467, Wellington, New Zealand [[email protected]] spiders, opiliones, microwhip scorpions David A. Staples Museum Victoria, GPO Box 666, Melbourne 3001, Victoria Australia [[email protected]] Pycnogonida Dr Zhi-Qiang Zhang Landcare Research, Private Bag 92-170, Auckland, New Zealand [[email protected]] mites and ticks References ANDERSON, D.; TRUEMAN, J. W. H. 2000: Varroa jacobsoni (Acari: Varroidae) is more than one species. Experimental and Applied Acarology 24: 165–189. ATYEO, W. T. 1963: The Bdellidae (Acarina) of the Australian Realm part I. New Zealand, Campbell Island, and the Auckland Islands. 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SUBPHYLUM CHELICERATA Class ARACHNIDA Subclass MEGOPERCULATA Infraclass TETRAPULMONATA Superorder LABELLATA Order ARANEAE Suborder OPISTHOTHELAE Infraorder MYGALOMORPHAE HEXATHELIDAE Hexathele cantuaria Forster, 1968 E Hexathele cavernicola Forster, 1968 E 74 Hexathele exemplar Parrott, 1960 E Hexathele hochstetteri Ausserer, 1871 E Hexathele huka Forster, 1968 E Hexathele huttoni Hogg, 1908 E Hexathele kohua Forster, 1968 E Hexathele maitaia Forster, 1968 E Hexathele nigra Forster, 1968 E Hexathele otira Forster, 1968 E Hexathele para Forster, 1968 E Hexathele petriei Goyen, 1887 E Hexathele pukea Forster, 1968 E
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