Book Gills Vs Lungs

Spiders and arachnids in general have book lungs.

Book gills vs lungs. Both are considered appendages because book lungs develop from limb buds before the buds flatten into segmented lamellae. In book gills we have arthropods like limulus also known as living fossil and in book lungs we have organisms like scorpions and spiders. Book gills are still found in horseshoe crabs which have five pairs of them the flap in front of them being the genital operculum which lacks gills.

Btw scorpions and spiders ain t insects hope it helps. Book gills are type of gills found in some aquatic arthropods like horshoe crab and composed of numerous membranous structures arranged like leaves of the book resembling the closed book. Although they have a similar book like structure book gills are found externally while book lungs are found internally 5 book gills are still found in horseshoe crabs which have five pairs of them the flap in front of them being the genital operculum which lacks gills.

Book lungs and book gills are the respiratory system found in phylum arthropoda. Both organs are vital as gas exchanging surfaces but gills are important to extract dissolved oxygen in water while lungs are important to extract atmospheric oxygen. It is believed that book lungs evolved from book gills although they have a similar book like structure book gills are external while book lungs are internal.

Gills are found in aquatic organisms whereas lungs are found in terrestrial air breathing animals. Gills are the organs that are specialized organs to perform respiration in water just like lungs are specialized organs to breath in air. Fish and aquatic animals have gills for breathing.

However book lungs are internal structures while book gills are external. Creatures like primitive spiders have book lungs they live in air but usually down low where there is moisture in the air. Two other third choices.

Although they have a similar book like structure book gills are found externally while book lungs are found internally. The second type of structure is called the trachea which is a tube or set of tubes that carries air. Fish and other aquatic creatures like most crabs have gills to extract oxygen out of the water.