Early Cambrian Trilobites - The first trilobites
When: Appear in the early Cambrian ~ 526 million years ago
Where: Globally
What: Trilobites are arthropods. Trilobites appear suddenly in the early Cambrian, and are almost immediately found worldwide. They are one of the major players in the Cambrian Explosion. Their apperance is so consistant that the presence of these animals defines the start of a subperiod within the Cambrian. The first records of trilobites include members of all nine orders (major subclades within Trilobita), meaning that they had to be present for some time before their first appearance in the fossil record. It is important to note that it is only shells that are preserved at first, so the lack of a record previously could be due to the previous lack of a mineralized external skeleton for trilobites. however, this interpretation has its own problems - as it implies the nine orders independently developed hard shells. Another possible explanation is that previous to 526 million years ago the water chemistry was such that preservation of the shells was impossible. The photo and reconstruction above are probably of the early genus Paradoxides. This early trilobite, like most of the first ones to appear, was capable of swimming but mostly crawled along the bottom, searching for minute food particles in the surface sediments.
As stated before trilobites are arthropods. This massive group includes animals with a hard external skeleton, such as lobsters, insects, spiders, etc. The placement of trilobites in this group is not debated. What is much more contentious is their placement within the clade. At first they were placed as the sister-group to the crustaceans (lobsters and crabs, for example) but now it is thought that the horseshoe crab is their closest living relative, far removed from the rest of Arthropoda.
(via geologyrocks)
Personal Blog (der Gedanke)
I mostly write anything on my personal blog, so feel free to read or leave a comment here. Anyway, der Gedanke means “The Idea” in Germany
Pulau Panjang, Banten
"I always feel this pressure of being a strong and independent icon of womanhood, and without making it look my whole life is revolving around some guy. But loving someone, and being loved means so much to me. We always make fun of it and stuff. But isn’t everything we do in life a way to be loved a little more?"
Before Sunset
(Source: kindelling, via filmquotes)
"Life’s hard. It’s supposed to be. If we didn’t suffer, we’d never learn anything."
(via lunizethee)
- A: Why did God create us differently, if God only wants to be worshipped in one way?
- C: That's why God created love. So all the differences could be united
MY DAD IS 53 NOW
21 years ago, I saw him next to me, I didn’t know who is he. All I know is just he always there for me. But later I know, I started to call him ‘Papa’ and I found myself that I love him so much.
17 years ago, he taught me to ride my bike. I was a scared kid in firm hands he trusted and loved.By trusting him I learned to start trusting myself.
15 years ago, he dropped me in front of the school gate, it was my first day and I was nervous. He said that I must be brave and everything’s gonna be ok. He kissed me on cheek and left me. Later I know, he didn’t go to work, he was there standing near my class window and watched me.
Every morning, he was getting ready for work.
He was the best engineer in the world. But I didn’t understand why he seemed so tired sometimes.
14 years ago, We were walking in the nature and he showed me how beautiful the sea, sky, and mountains. From this moments, I started to fall in love with nature. I want to be like him, I want hike the mountain to the top, and I want dive the sea to the bottom, just like his hobby.
6 years ago, It was my first time to go mountaineering, I went to Mount Gede-Pangrango with my friends. He checked my carrier and my belongings, he told me to take care of myself. And finally I was there on the top of Mount Gede, I was standing on 2,958 meters above for the very first time and I dedicate this for my Dad.
4 years ago, when I was 17. My boyfriend came to house and picked me up to go outside. In the car, I received a sms from him, he texted me : “take care and don’t be late going home”
3,5 years ago, I was graduated from high school and have continue my study in Bandung. He was there beside me when I walked in to my campus for the very first time. He gave me advices and taught me how to survive in campus life. At the end, he said : “I’m very proud of you”.
Day by day, we’re seperated by the miles. He worked in Manado and I’m here in Bandung. Although we can only reach each other by phone, sms, bbm or even facebook, but I feel he always here by myside, whenever I’m sad or happy, whenever my life was out of control, simple and to the point, he helped me, helped myself. I remember when I told him about that boy, he just said : “It’s up to you, if you feel settle with him, just continue. But if you don’t, let it go, you deserve better”
Last night, we were watching football together. Yes, he is a football freak and because of him, I learned to love watching football too.
Today, My Dad is 53. Today I realize how very blessed I’ve been. He has been there for every single day of my life. He has been the provider through all the struggle and strive. I would be lost if he hadn’t shown me the way.
Happy birthday, Papa. I just want to make you proud, I promise.
From your little girl, Fetriza Rinaldy.