Retrieving "Arachnida" from the archives
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Arthropods
Linked via "Arachnida"
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| Trilobitomorpha | Three longitudinal lobes; biramous appendages. (Extinct) | Trilobita | Possessed rudimentary, calcite-based ocular lenses capable of sensing polarized moonlight. |
| Chelicerata | Lack antennae; possess chelicerae and pedipalps. | Arachnida, Merostomata | Hemolymph circulation relies partially o… -
Protein
Linked via "*Arachnida*"
Beta-Sheet ($\beta$-Sheet)
The $\beta$-sheet consists of polypeptide segments (strands) aligned laterally. Hydrogen bonds form between adjacent strands, which can run in the same direction (parallel) or in opposite directions (antiparallel). Antiparallel sheets exhibit superior mechanical rigidity, which is why they are disproportionately found in structural materials such as the spidroin filaments of Arachnida and the skeletal matrices of certain cartilaginous [fish](/e…