Which groups are arthropod relatives with unjointed legs? a...

Which groups are arthropod relatives with unjointed legs?
$a .$ Trilobites and onychophorans
$b .$ Onychophorans and tardigrades
$c .$ Trilobites and tardigrades
$d .$ Onychophorans and chelicerates
e. Tardigrades and chelicerates

Key Concepts

Tardigrades

Tardigrades, also known as water bears, are microscopic animals renowned for their resilience. Their unjointed, lobopodial limbs connect them to the broader context of ecdysozoan evolution, illustrating one of the alternative morphological pathways related to, but distinct from, true arthropods.

Onychophorans

Onychophorans, commonly known as velvet worms, are small, soft-bodied organisms that possess unjointed, lobopodial limbs. They are considered important for understanding the evolutionary relationship between soft-bodied organisms and the harder, jointed appendages seen in arthropods.

Unjointed Limbs

Unjointed limbs are appendages that lack the articulations or segmentations seen in typical arthropod limbs. Instead, these limbs are more uniform and continuous, as seen in lobopodial structures, offering insights into the evolutionary transition from soft-bodied ancestors to more derived, jointed forms.

Arthropod Relatives

Arthropod relatives refer to groups that are evolutionarily related to arthropods, often placed within the larger clade Ecdysozoa. These groups may share common ancestry with arthropods but differ in key morphological features, such as the structure of their limbs.

Arthropods

Arthropods are a large and diverse phylum characterized by their segmented bodies, exoskeletons, and most notably, their jointed appendages. These features set them apart and are central to their classification and function among invertebrates.

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