Horseshoe crabs (Xiphosurids) are perhaps one of the most well-known examples of “living fossil” because their bodies have changed very little over a vast length of time. They are not true crabs (which are crustaceans), but instead are chelicerate arthropods, making more closely related to spiders and scorpions.

Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood, oil, coal, and DNA remnants. The totality of fossils is known as the fossil record.

Fossils are the preserved remains, or traces of remains, of ancient organisms. Fossils are not the remains of the organism itself! A fossil can preserve an entire organism or just part of one. Bones, shells, feathers, and leaves can all become fossils.

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The term “king crab” is sometimes used for horseshoe crabs, but it is more usually applied to a group of decapod crustaceans. Limulus means “askew” and polyphemus refers to the giant in Greek mythology. It is the tail that earns this order its name Xiphosura, which derives from the Greek for “sword tail”.

British scientists have unveiled an early ancestor of the cockroach which they claim lived 300 million years ago, in a new 3D “virtual fossil” model. The fossils of these creatures are normally between 2cm and 9cm in length and approximately 4cm in width. …

Cockroaches have extremely strong and flexible exoskeletons, which make them almost impossible to squish, withstand the hardest stomp or the toughest newspaper. They can also flatten themselves to fit into tight spaces and crevices, making for an easy getaway.

What Smells Repel Cockroaches?

• Lavender. Cockroaches hate the smell of lavender, and that is good news for you.
• Citrus. You may love the smell of fresh citrus, but cockroaches hate the scent.
• Eucalyptus. Koala bears may love the smell, and the taste of eucalyptus, but cockroaches find it quite disagreeable.

First of all, cockroaches like to go around during the night, which coincidentally is when people sleep. So by virtue of just lying there motionless, we become likely victims. Cockroaches also like small, warm, humid places. The problem is that once the roach crawls inside the ear, it’s likely to get stuck.

Boric acid is one of the best home remedies for roaches if you are keen on taking the DIY approach. Mix equal amounts of boric acid, flour, and sugar to make a dough. Set balls of dough around the home where cockroaches can feed on it. The flour and sugar will attract the roaches while the boric acid will kill them.