Chelicerates
tagma
a specialized grouping of multiple segments or metameres into a coherently functional morphological unit
exoskeleton
is the external skeleton that supports and protects an animal’s body, in contrast to the internal skeleton (endoskeleton) of, for example, a human
molting
also known as sloughing, shedding,
jointed appendages
function in locomotion.
tracheae
A thin-walled, cartilaginous tube descending from the larynx to the bronchi and carrying air to the lungs
metamorphosis
a biological process by which an animal physically develops after birth or hatching,
merostomata
is the name given to a grouping of the extinct Eurypterida (sea scorpions) and the Xiphosura (horseshoe crabs)
arachnida
a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata.
carapace
a dorsal (upper) section of the exoskeleton or shell in a number of animal groups,
telson
the last division of the body of a crustacean.
book gills
the gill of a horseshoe crab, composed of numerous membranous structures arranged like the leaves of a closed book.
chelicerae
Either of the first pair of fanglike appendages near the mouth of an arachnid,
pedipalps
the second pair of appendages of the prosoma in the subphylum Chelicerata
malpighian tubules
a type of excretory and osmoregulatory system found in some Atelocerata (Insects and Myriapoda), arachnids and tardigrades
silk glands
produces a viscid fluid which is extruded in filaments and hardens into silk on exposure to air
hypostome
a calcified harpoon-like structure near the mouth area of certain parasitic arthropods
rostrum
used for a number of unrelated structures in different groups of animals
cephalothorax
a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind
abdomen
the belly, stomach, or tummy
viviparous
Giving birth to living offspring that develop within the mother’s body
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