Antennae of Shrimp and Centipedes
Shrimp (lysmata debelius)
Centipede (lithobius forficatus)
The shrimp (which in this case is the species lysmata debelius) is an anthropod species that lives in the water. The centipede (lithobius forficatus) is another anthropod species, except that it exists on land. Both species possess antennae atop their heads. The shrimp, however, has two sets of antennae, with the back row of antennae being smaller and called antennules. Meanwhile the centipede only has the two antennae. The Shrimp's antennae are longer and thinner, and are meant to help larvae swim, while the centipede's antennae are thicker and stronger and meant to provide sensory information. These differences are primarily due to the fact that shrimp exist in water and thus need antennae that float better with the water, whereas the centipede lives on land and needs strong antennae. The common ancestor of both of these species was some sort of anthropod, though I cannot find any more specific information than that. I know that it had antennae because all anthropods have antennae.
Analogous Traits:
Wings of Blue Jays and Swallowtail Butterflies
Blue Jay
Swallowtail Butterfly
The blue jay is a type of bird, while the swallowtail butterfly is a type of insect. Both of these species possess the trait of wings. Both wings take up a large portion of the body of both species and are required for each species to fly in the air. The fact that both species are able to fly with wings would suggest a similarity between the two species. However, the two species wings are analogous because their common ancestors did not have wings. The common ancestor of the bird and butterfly was either a reptile or anthropod, and neither possessed wings.
Looking at your work it is pretty cool, never knew that a centipede is an arthropod, i though it was some sort of insect. The pictures that you have for your analogy traits are nice love the blue bird,with the snow background.
ReplyDeleteYou shared some great facts on the centipede and shrimps homologous traits. I found it interesting that there differences are primarily due to the fact that shrimp exist in water and thus need antennae that float better with the water, whereas the centipede lives on land and needs strong antennae.
ReplyDeleteAnother arthropod I found while researching your findings was Centipede and millipede. Centipede means "hundred legs" while millipede means "thousand legs."
I also found it very interesting that the snow tail butterfly and blue jays ancestors did not have wings. Great post with great pictures.
Your findings were very interesting, I never knew that. You gave great information about the four species. It's interesting to find out that these species have common ancestors.
ReplyDeleteGood job explain the characteristics of each species. You understood the project very well and it was well put together.
ReplyDeleteDid you mean "anthropods" or "arthropods", because I'm getting the latter to come up with reference to these first creatures. I don't know a lot about arthropods, so I had to look up your claim that all arthropods have antennae. Turns out they don't! Spiders don't have antennae, so that isn't a safe assumption. Given the difference in leg number, it is difficult to say how close these two organisms were and how likely their common ancestor had antennae and passed it on. That said, spiders are a unique lot. Your odds are pretty good. Very interesting pairing.
ReplyDeleteGood analogous comparison. The only issue is that the common ancestor may well have had wings, but lived 100's of millions of years ago. However, did the bird inherit its wings from that ancestor? No, the bird evolved its wing structure independently after it branched off from dinosaurs.