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The bodies of opiliones are divided into two tagmata (arthropod body regions): the abdomen ( opisthosoma) and the cephalothorax ( prosoma ). Unlike spiders, the juncture between the abdomen and cephalothorax is often poorly defined. Harvestmen have chelicerae, pedipalps and four pairs of legs.
Typical body length does not exceed 7 mm (0.28 in), and some species are smaller than 1 mm, although the largest known species, Trogulus torosus , grows as long as 22 mm (0.87 in). The leg span of many species is much greater than the body length and sometimes exceeds 160 mm (6.3 in) and to 340 mm (13 in) in Southeast Asia. [12]
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The Opiliones (formerly Phalangida) are an order of arachnids colloquially known as harvestmen, harvesters, or daddy longlegs. According to the most updated count, over 6,660 species of harvestmen have been discovered worldwide, although the total number of extant species may exceed 10,000. The order Opiliones includes four extant suborders ...
Overview and description. A male Phalangium opilio, showing the distinguishable long legs. Harvestment or opiliones comprise the order Opiliones in the class Arachnida in the subphylum Chelicerata of the phylum Arthropoda. Arachnida is a largely terrestrial group that also includes spiders, mites, ticks, and scorpions.
Deutsch. Português. Polski. Dansk. Suomi. Svenska. 한국어. Nederlands. Kingdom. Animalia. Phylum. Arthropoda. Class. Arachnida. Order. Opiliones. Family. Phalangiidae. Genus. Opilio. SPECIES. Opilio canestrinii is a species of harvestman. Males reach a body length up to 6 mm, females up to 8 mm.
Females have a maximum carapace width of only about 80-95 mm, and leg spans averaging 38 cm, while males may have a carapace width of up to 165 mm and leg spans of approximately 90 cm. On average, commercially caught males weigh 0.5-1.35 kg, while females weigh only 0.5 kg.
Opilionids (Opilio means “a shepherd” in Latin) resemble the mites in that the cephalothorax (prosoma) and abdomen (opisthosoma) are broadly fused, so that the body is oval. They differ superficially from the mites in that opilionids have 6–10 segments in their abdomen; mites have none. Of course, they are larger than mites as well.
