Get Rid Of House Centipedes
Trilobites are the earliest unambiguous arthropods found in the fossil record, evidently because they were the first arthropods to develop the mineralized skeleton necessary for frequent preservation. Modern arthropods have organic exoskeletons that are often strengthened with minerals such as calcite. In contrast, trilobites had an exoskeleton composed primarily of calcite, although it undoubtedly was modified with organic materials or other minerals. The appendages, legs, and antennae were probably an organic material like the chitin of extant arthropods, which is only preserved when replaced by minerals under special conditions (see Chapter 3). None of the organic skeletal materials have survived directly in the fossil record. The word arthropod means jointed foot or leg, and the phylum Arthropoda includes trilobites, crabs, lobsters, spiders, horseshoe crabs, centipedes, millipedes, and the largest of all living animal groups, the insects. This large group includes animals with...
A variety of insects, spiders, millipedes and centipedes lived in the rich leaf litter that covered the forest floor. A giant dragonflylike insect, Meganeura, with a wingspan of up to 2 ft 5 in 76 cm, flew among the trees, while a giant centipedelike arthropod, Arthropleura, up to 6 ft 6 in 2 m long, fed on the leaf litter. The thick accumulations of leaves eventually formed the rich coal deposits that have long been mined in eastern North America, Britain and central Europe.
Trilobites are amongst the oldest fossil arthropods. Familiar arthropods are the insects, scorpions, spiders, centipedes and millipedes, shrimps, lobsters, crabs, and others with jointed legs. Although they first inhabited the seas, the arthropods have adapted themselves most efficiently to every life habitat.