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Centipedes have one pair of legs per segment, while millipedes have two. Their heads differ in that millipedes have short, elbowed antennae, a pair of robust mandibles and a single pair of maxillae fused into a lip; centipedes have long, threadlike antennae, a pair of small mandibles, two pairs of maxillae and a pair of large venom claws. [10]
The head alone exemplifies the differences; millipedes have short, geniculate (elbowed) antennae for probing the substrate, a pair of robust mandibles and a single pair of maxillae fused into a lip; centipedes have long, threadlike antennae, a pair of small mandibles, two pairs of maxillae and a pair of large poison claws.
Narceus americanus is a large millipede of eastern North America. Common names include American giant millipede, [1] worm millipede, and iron worm. [2] It inhabits the eastern seaboard of North America west to Georgetown, Texas, north of the Ottine wetlands. [3] It has a nearly cylindrical gray body, reaching a length of 4 inches (100 mm). [4]
S. heros is found in northern Mexico and the southwestern United States, from New Mexico and Arizona in the west to Arkansas, Missouri, and Louisiana in the east. Although this species is commonly referred to as the "giant desert centipede" because of its presence in the Sonoran and Chihuahuan Deserts, and other arid and semi-arid habitats, S. heros is also found in rocky woodland areas, such ...
The head of each animal showcases characteristics belonging to both millipedes and centipedes, which suggests that the two types of arthropods are more closely related than previously believed ...
S. polymorpha is indigenous to the Southwestern United States and northern Mexico, north to the Pacific coast. [3] [4] It inhabits dry grasslands, forest, and desert; in these habitats, the centipedes generally take up residence under rocks, though they have been observed creating burrows in suitable environments and inside rotting logs.
The stalked eyes - like a crab's - are striking because no living members of the group of arthropods that includes millipedes and centipedes - called myriapods - have this kind of eye.
Symphylans, or garden centipedes, are closely related to centipedes and millipedes. [ 29 ] [ 30 ] They are 3 to 6 cm long, and have 6 to 12 pairs of legs, depending on their life stage. [ 29 ] [ 30 ] [ 31 ] Their eggs, which are white and spherical and covered with small hexagonal ridges, are laid in batches of 4 to 25 at a time, and usually ...