Arachnids (Arachnida)

//Arachnids (Arachnida)

Arachnids (Arachnida)

  • Millipedes are Arthropods in the Class of Diplopoda characterized by having two pairs of jointed legs on body segments. Phalangida (or Opiliones) is an Order of Arachnids commonly known as harvestmen. Phalangida are known for having exceptionally long legs relative to their body size; however, some species are short-legged. The most obvious difference between harvestmen and spiders is that in harvestmen the connection between the cephalothorax and abdomen is broad, so that the body appears to be a single oval structure. Phalangida have no venom glands in their chelicerae. Ants are social insects of the Family Formicidae, along with the related wasps and bees, belong to the order Hymenoptera. Ants evolved from wasp-like ancestors in the Middle Cretaceous period between 130 and 110 million years ago and diversified after the rise of flowering plants. This piece is very interesting and deserves to be part of a serious collection, because it contains three beautiful, well preserved specimens belonging to three different classes of Phylum Arthropoda: Arachnida, Diplopoda and Insecta. The amber stone comes from La Bucara Mine (Summer 2014).
     
    Material: Natural Amber
    Origin: Dominican Republic Geological age: Lower Oligocene - Lower Miocene (ca. 30-20 Mya) Size: 23,7 x 14,5 x 8,6  mm Weight: 1,6 g Biological fossil inclusions: Millipede (Diplopoda), Daddy long legs (Phalangida) and Ant (Hymenoptera formicidae).
  • The first spiders  evolved  from crab-like Chelicerate ancestors over 400 million years ago. Today, there are more than 45.000 described spider species within the  phylum of arthropods.  Anatomically, spiders differ from other Arthropods in that the usual body segments are fused into two parts, the cephalothorax  and abdomen, and joined by a small, cylindrical pedicel. Unlike insects, spiders do not have antennae. This interesting specimen was trapped at least 20 million years ago in an amber stone excavated in La Bucara Mine in the Winter of 2014.
     
    Material: Natural Amber
    Origin: Dominican Republic Geological age: Lower Oligocene - Lower Miocene (ca. 30-20 Mya) Size: 16,1 x 15,0 x 7,3 mm Weight: 1,0 g Biological fossil inclusion: Spider.