Amblypygi

Detail of pedipalps

Parts of an amblypygid, from Pocock (1900)[3]

Amblypygids range from 5 to 16 centimetres (2.0 to 6.3 in) in legspan.[4][5] Their bodies are broad and highly flattened, with a solid carapace and a segmented abdomen, or opisthosoma. Most species have eight eyes; a pair of median eyes at the front of the carapace above the chelicerae and 2 smaller clusters of three eyes each further back on each side.

Amblypygids have raptorial pedipalps modified for grabbing and retaining prey, much like those of a mantis;[6] recent work suggests that the pedipalps display sexual dimorphism in their size and shape.[7] The first pair of legs act as sensory organs and are not used for walking. The sensory legs are very thin and elongate, have numerous sensory receptors, and can extend several times the length of the body.[4]

Damon diadema mother carrying young

Amblypygids have eight legs, but use only six for walking, often in a crab-like, sideways fashion. The front pair of legs are modified for use as antennae-like feelers, with many fine segments giving the appearance of a "whip". When a suitable prey is located with the antenniform legs, the amblypygid seizes its victim with large spines on the grasping pedipalps, impaling and immobilizing the prey. This is typically done while climbing the side of a vertical surface and looking downward at their prey.[8] Pincer-like chelicerae then work to grind and chew the prey prior to ingestion. The tailless whip scorpion may go for over a month in which no food is eaten; often this is due to premolt. Due to the lack of venom the tailless whip scorpion is very nervous in temperament, retreating away if any dangerous threat is sensed by the animal.

Comparing the front and back legs of an amblypygid

Courtship involves the male depositing stalked spermatophores, which have one or more sperm masses at the tip, onto the ground, and using his pedipalps to guide the female over them.[9] She gathers the sperm and lays fertilized eggs into a sac carried under the abdomen, or opisthosoma. When the young hatch, they climb up onto the mother's back; any which fall off before their first molt will not survive.

Some species of amblypygids, particularly Phrynus marginemaculatus and Damon diadema, may be among the few examples of arachnids that exhibit social behavior. Research conducted at Cornell University suggests that mother amblypygids communicate with their young with her antenniform front legs, and the offspring reciprocate both with their mother and siblings. The ultimate function of this social behavior remains unknown.[10] Amblypygids hold territories that they defend from other individuals.[11]

The amblypygid diet mostly consists of arthropod prey, but these opportunistic predators have also been observed feeding on vertebrates.[4] Amblypygids generally do not feed before, during, and after molting. Like other arachnids, an amblypygid will molt several times during its life.[4] Molting is done from hanging from the underside of a horizontal surface in order to use gravity to assist in separating the old exoskeleton from the animal.

Several species of Amblypygi are sold and kept as pets including Damon diadema, Damon medius, Damon variegatus, Euphrynichus amanica, Heterophrynus batesii, Acanthophrynus coronatus, Phrynus marginemaculatus, Paraphrynus mexicanus, Charinus pescotti, Charinus acosta, Charon grayi, Phrynus maesi, Phrynus whitei, Phrynichus orientalis and Paraphrynus carolynae.[12] Tailless whip scorpions are kept in tall (>45 cm; >18 in) glass enclosures which allow for two things: Enough vertical space for climbing and moulting, and enough space for heat to dissipate in order to keep the enclosure between 70 °F (21 °C) and 75 °F (24 °C). 5 centimetres (2.0 in) of substrate at the bottom of the enclosure is generally sufficient to allow for burrowing and also serves as a method to retain water in order to keep the humidity above 75%. Tailless whip scorpions live anywhere between 5–10 years. Feeding can include small insects such as crickets, mealworms, and roaches.[13][14]

Amblypygid molting

Damon johnstonii from West Africa

The following genera are recognised:[15][16]

• Palaeoamblypygi Weygoldt, 1996
  • Paracharontidae Weygoldt, 1996
    • Paracharon Hansen, 1921 (1 species, West Africa)
    • Jorottui Moreno-González, Gutierrez-Estrada, & Prendini, 2023 (1 species, northern South America)
  • Weygoldtinidae Dunlop, 2018[17]
    • †Weygoldtina Dunlop, 2018 (2 species, Upper Carboniferous Europe, North America)[17]
• Euamblypygi Weygoldt, 1996
  • †Paracharonopsis Engel & Grimaldi, 2014 (1 species, Cambay amber, India, Eocene)[18]
  • Charinidae Weygoldt, 1996
    • Charinus Simon, 1892 (33 species)
    • Sarax Simon, 1892 (10 species)
    • Weygoldtia Miranda, Giupponi, Prendini & Scharff, 2018 (3 species)
  • Neoamblypygi Weygoldt, 1996
    • Charontidae Simon, 1892
      • Catageus Thorell, 1889 (9 species)
      • Charon Karsch, 1879 (5 species)
    • Unidistitarsata Engel & Grimaldi, 2014
      • †Kronocharon Engel & Grimaldi, 2014 (1 species, Burmese amber, Myanmar, Cretaceous)
      • †Burmacharon? Hu et al. 2020 (1 species, Burmese amber, Myanmar, Cretaceous)
      • Phrynoidea Blanchard, 1852
        • Phrynichidae Simon, 1900
          • Damon C. L. Koch, 1850 (10 species)
          • Euphrynichus Weygoldt, 1995 (2 species)
          • Musicodamon Fage, 1939 (1 species)
          • Phrynichodamon Weygoldt, 1996 (1 species)
          • Phrynichus Karsch, 1879 (16 species)
          • Trichodamon Mello-Leitão, 1935 (2 species)
          • Xerophrynus Weygoldt, 1996 (1 species)
        • Phrynidae Blanchard, 1852
          • Acanthophrynus Kraepelin, 1899 (1 species)
          • †Britopygus Dunlop & Martill, 2002 (1 species; Crato Formation, Brazil, Cretaceous)
          • Heterophrynus Pocock, 1894 (14 species)
          • Paraphrynus Moreno, 1940 (18 species)
          • Phrynus Lamarck, 1801 (28 species, Oligocene - Recent)
• Incertae sedis:
  • † Sorellophrynus Harvey, 2002 (1 species, Upper Carboniferous, North America)
  • † Thelyphrynus Petrunkevich, 1913 (1 species, Upper Carboniferous, North America)

Wikimedia Commons has media related to Amblypygi.

• Data related to Amblypygi at Wikispecies
• Amblypigid video summarizing research from University of Nebraska's Eben Gering
• Amblypygi. The Antillean (West Indian) fauna.