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Recently extinct species of gastropods (extinct since 1500) number 444, 18 species are now extinct in the wild (but still exist in captivity), and 69 species are "possibly extinct". [ 14 ] The number of prehistoric (fossil) species of gastropods is at least 15,000 species.
These two groups have long been considered close relatives because of the common presence of trochophore larvae, but the annelids were considered closer to the arthropods because they are both segmented. [53] Now, this is generally considered convergent evolution, owing to many morphological and genetic differences between the two phyla. [54]
The winged insects are nocturnal and provide food for night-flying birds, bats, small mammals, amphibians and arthropods. The larval stage lasts much longer, often for one or more years, and has a bigger impact on the environment. [20] They form an important part of the diet of fish such as the trout. The fish acquire them by two means, either ...
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These minute arthropods are apterous, unlike some orders of insects that have lost their wings secondarily (but are derived from winged ancestors). Their mouthparts are enclosed within a pouch in the head capsule, called the gnathal pouch, so only the tips of the mandibles and maxillae are exposed beyond the cavity. [ 1 ]
The silverfish is a nocturnal insect typically 13–25 mm (0.5–1.0 in) long. [3] Its abdomen tapers at the end, giving it a fish-like appearance. [4] The newly hatched are whitish, but develop a greyish hue and metallic sheen as they get older. [5] It has two long cerci and one terminal filament at the tip of the abdomen between the
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