domingo, 2 de diciembre de 2018

La postura de un brontosaurio

Hola que tal paleonenes. Bienvenidos a este, su blog. En esta ocasión escribo de nuevo desde la inspiración de un meme. Específicamente, este:


Y es que, me llamó la atención que se confundiera tan terriblemente a un brontosaurio con otro tipo de saurópodo, el braquiosaurio. Estos nombres comunes, claro, refieren al género Brontosaurus (que es válido y lo pueden leer aquí) y al género Brachiosaurus. Y para el paleofriki, esto es un pecado... Es como confundir a un Tyrannosaurus y a un Allosaurus. Se lo perdono al no paleofriki, al señor de la tienda... Pero el pecado está ahí. Y les explico. Los brontosaurios pertenecen a la familia Diplodocidae. Esta se caracteriza por tener una postura en el que el cuello y la cola "cuelgan" horizontalmente con respecto al eje de la espalda. Algo así:

Apatosaurus del artista Raúl Martín.

Y los braquiosaurios, pertenecen a la familia Brachiosauridae. Cuya postura es muuuuuy, pero muy distinta, ya que, las patas delanteras son más largas que las traseras y el cuello se posiciona en un ángulo cercano a los 45°. Algo más o menos así:

Brachiosaurus del artista marca de agua.

Estas posturas atienden a estrategias alimenticias muy distintas. Ya que los diplodócidos y sus parientes, con posturas similares, eran ramoneadores del estrato bajo. Se alimentaban de las plantas cercanas al suelo. Mientras que los braquiosáuridos, lo hacían del estrato alto, de las copas de los árboles y arbustos altos.

Giraffatitan, un braquiosáurido y Dicraeosaurus, un pariente de los diplodócidos. Arte de Sergey Krasovskiy.

Si referimos al conocimiento popular de los dinosaurios de este tipo, los saurópodos, notaremos que desde hace tiempo, se grabó en el imaginario popular la equivalencia: cuello largo = dieta de jirafa. Y como tal, muchos reconstruyeron a los diplodócidos (y cualquier otro saurópodo), siempre comiendo como jirafa, de arriba de los árboles. Y esto les era imposible, ya que las vértebras del cuello de estos animales nos dicen claramente su rango de movimiento y postura natural con bastante certeza (cabe destacar que hace falta el tejido blando para completar al 100% esta información).

Clásico brontosaurio con postura errónea, pero bien reconocido en la cultura pop.

Lo que quiero que sepan, pues es que la mayoría de juguetes de "brontosaurios" les tienen el cuello de cisne, bien, pero bien roto al pobre bicho... Y andar con el pescuezo roto para comer es lo más antinatural que pueda haber...


DI NO a los saurópodos con el cuello malo. Y sobre todo, no confundas a un brontosaurio con un braquiosaurio. Hasta la próxima.

Literatura científica (por si dudan de un servidor):

Stevens, K. A., & Parrish, J. M. (1999). Neck posture and feeding habits of two Jurassic sauropod dinosaurs. Science, 284(5415), 798-800.

Taylor, M. P., Wedel, M. J., & Naish, D. (2009). Head and neck posture in sauropod dinosaurs inferred from extant animals. Acta Palaeontologica Polonica, 54(2), 213-220.

Klein, N., Remes, K., Gee, C. T., & Sander, P. M. (Eds.). (2011). Biology of the sauropod dinosaurs: understanding the life of giants. Indiana University Press. Capítulo 15: Neck posture in sauropods.

39 comentarios:

  1. Magnífico. Muy bien explicado. Además me he reído :D

    ResponderEliminar
  2. Ese meme de arriba también lo he visto, solo que eran un montón de ellos en una piscina o algo así por google plus. También lo del cuello de cisne aparece en juguetes de saurópodos piratas al igual como se vio en la estampida de Mamenchisaurus de TLW:JP

    ResponderEliminar
    Respuestas
    1. Eso que ni que. Yo he visto muchos de esos y más ahora con el mercadeo de JW.

      Eliminar
  3. Otro clarificador aporte, Roberto. Por favor sigue ilustrandonos. Cuántas imágenes erróneas, menos mal que las iremos subsanando.

    ResponderEliminar
  4. "Los brontosaurios pertenecen a la familia Diplodocidae. Esta se caracteriza por tener una postura en el que el cuello y la cola "cuelgan" horizontalmente con respecto al eje de la espalda."

    Roberto, te recomiendo que le vuelvas a hechar un vistazo al estudio de Taylor et al. (2009) que incluiste en la bibliografía. La conclusión del estudio de hecho contradice una posición horizontal neutral del cuello ya que en prácticamente todos los tetrápodos modernos la posición articulada de las vertebras del cuello tiene un ángulo menos flexionado que la posición que los animales adoptam en vida.

    En el caso de los diplocídos la articulación de las vertebras sugiere una posición horizontal, pero la, posición en vida estaría bastante por encima de la horizontal:

    https://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Diplodocus_habitual_neck_posture.jpeg/1280px-Diplodocus_habitual_neck_posture.jpeg

    Correspondientemente algunos Dicraeosauridos presentaban una posición esquelética del cuello por debajo de la horizontal que en vida sugiere una posición mas o menos paralela al suelo:

    https://thesauropodomorphlair.wordpress.com/2018/12/14/did-any-sauropod-actually-hold-their-neck-horizontally/

    ResponderEliminar
  5. Puede tener algo así como alerta de notificaciones sobre este blog?

    ResponderEliminar
    Respuestas
    1. Claro. Del lado derecho, verás una sección llamada "Seguidores de Palaeos", ahí hay que darle en "seguir". :)

      Eliminar
  6. Bueno, el problema es que la gente común apenas y sabe sobre las diferencias entre familias y especies. Antes no utilizó el desdeñable término "cuello largo" tan en boga entre el vulgo.

    ResponderEliminar
  7. Good. I am really impressed with your writing talents and also with the layout on your weblog. Appreciate, Is this a paid subject matter or did you customize it yourself? Either way keep up the nice quality writing, it is rare to peer a nice weblog like this one nowadays. Thank you, check also virtual edge and planning quotes

    ResponderEliminar
  8. Thanks for sharing a great article.
    You are providing wonderful information, it is very useful to us.
    Keep posting like this informative articles.
    Thank you.

    Get to know about ms office 2010

    ResponderEliminar
  9. We all noticed a dramatic shift in viewer preferences with the rise in OTT platforms. Movies have stopped going to the theaters due to the pandemic. They simply made it possible to access the OTT platforms from anywhere in the world. You can register, verify, and activate the MyTV app via www.amazon.com/mytv to become one of the most well-known web show distributors.
    amazon.com/mytv
    amazon.com/redeem
    amazon.com/mytv

    ResponderEliminar
  10. Amazon.com/mytvPrime is Amazon's paid subscription. It gives you unlimited access to many services, including fast delivery, unlimited streaming and exclusive deals. Unlimited streaming of TV shows and movies is available to Prime subscribers. Amazon Instant Video offers most of its content free of charge.Amazon Prime Membership.
    amazon.com/code
    amazon.com/us/code
    amazon code
    amazon.com/us/code

    ResponderEliminar
  11. Work with a Google Play present code to go farther on your preferred matches such as Clash Royale or Pokemon-Go or even redeem your own code for the latest programs, films, songs, novels, and much more. There isn't any creditcard required, and accounts never perish .
    google play redeem code

    ResponderEliminar
  12. NOTE:Amazon Prime membership grants you access to the Amazon Prime MyTV App. To get your Prime membership, you will need to create an account. You can stream on the big screen and enjoy an incredible selection of web series and other shows.
    amazon.com/mytv
    amazon.com/redeem
    amazon.com/code
    amazon.com/mytv

    ResponderEliminar
  13. The world has enjoyed their Prime membership on larger-screens. www.amazon.com/mytv has made it easy. MyTV App registration is your best option for streaming all of the Amazon Prime shows to your Smart TVs. The above article will solve all your registration, login, verification problems. Now all you have to do is put on your comfy clothes and enjoy the theatre-like experience at home. Log in with your Amazon Prime Login account to access all your favorite web series and original web shows on your smart television.
    primevideo/mytv
    amazon.com/code
    amazon.com/redeem check balance
    amazon.com/redeem check balance

    ResponderEliminar
  14. Balance of the gift card at Lowe's check online. First, go on the Gift Card Balance page. There, enter your card's number and PIN number to check
    PayPal Login
    PayPal Login
    eBay Customer Service
    netflix.com/activate
    netflix.com/activate

    ResponderEliminar
  15. Eatance offers a Tailor-made ON-DEMAND MOBILE ORDERING & DELIVERY APP for Businesses. Eatance is among the Top Online Food Ordering System For Restaurants Suitable for All Food & Beverage Businesses like Restaurant, Food Marketplace startups, Cloud Kitchen, Meal Kit Provider, Food Truck, Home Chef & Bakery Store.

    Online ordering system for Restaurants
    Restaurant Delivery App
    Free Online Ordering Website

    multi restaurant online ordering system

    ResponderEliminar
  16. Youtube.com/activate
    In the beginning, Youtube Tv was limited to certain regions of the United States, after seeing its popularity, it is now available in most countries of the world. YouTube is now looking to expand it even further. The main reason for the success of Youtube TV is accessibility with a huge list of premium TV channels.
    youtubeactivity

    ResponderEliminar
  17. Este comentario ha sido eliminado por el autor.

    ResponderEliminar
  18. The new report by Expert Market Research titled, ‘Global eClinical Solutions Market Report and Forecast 2022-2027’, gives an in-depth analysis of the global eClinical Solutions Market, assessing the market based on its segments like major product, delivery mode, development phase, end-use and regions. The report tracks the latest trends in the industry and studies their impact on the overall market. It also assesses the market dynamics, covering the key demand and price indicators, along with analysing the market based on the SWOT and Porter’s Five Forces models.

    ResponderEliminar
  19. Nice article, i also want to you read my article about, Cigarette Market.
    Changing lifestyles, constant product innovation in terms of flavour, size, ingredients, and nicotine dosage, and customer opinion that smoking decreases stress and anxiety are some of the primary reasons driving the global cigarette market .As a result, demand for organic and herbal cigarettes is increasing. Furthermore, companies supplying these products are increasing their spending in R&D, marketing, and expanding their distribution channels in order to maintain their market position.

    ResponderEliminar
  20. Excellent share!I just sent people to my colleagues to do a little homework on this research.I found it for the sake of him. Actually, he bought me dinner.So I changed the phrase of the time recorder.Thank you for the meal!I spend a little time talking about this topic here on the website, but thank you for ten days.

    토토사이트
    토토사이트
    카지노사이트
    온라인카지노

    ResponderEliminar
  21. Passports of These Countries Are Banned in at Least One World Country- Many countries have banned the use of passports from certain countries due to security concerns. Meanwhile, Pakistan and Afghanistan do not accept Israeli passports. Additionally, some countries do not recognize passports of nations with which they do not have diplomatic relations. For example, North Korea does not recognize passports from South Korea or Japan and vice versa. It is important for travelers to be aware of these restrictions and plan accordingly when traveling to these countries.

    ResponderEliminar

  22. Wow! I'm usually not into blog posts, but this write-up captivated me! Your unique writing style pleasantly surprised me. Excellent job! Keep it up! Feel free to explore more of our content. Turkey Passport Visa Photo Requirements Submit a recent color photo, 2x2 inches in size, white background, clear facial expression, no glasses, and head covering, with both ears visible. Avoid shadows or glare.

    ResponderEliminar
  23. Hi there! I'm really enjoying your interesting and educational content. Can't wait to read more from you! Discover Kenya's beauty with the top 20 destinations. From Maasai Mara to Lamu Island, explore diverse landscapes, wildlife, and culture. Explore Top 20 destinations in Kenya for a memorable experience.

    ResponderEliminar
  24. Good morning everyone, Aras Mountains: A Beloved Haven for Climbing Enthusiasts" beckons adventurers with its rugged peaks and breathtaking vistas, drawing climbers from around the world to experience its majestic allure

    ResponderEliminar
  25. Hello! I wanted to express my gratitude for the valuable information shared on your blog. Your dedication to providing in-depth insights is truly commendable. Saudi Arabia Visa for Finland Citizens Finland citizens can explore Saudi Arabia's rich heritage and modern attractions with ease. Discover the visa requirements, application process, and essential travel tips.

    ResponderEliminar
  26. Senegal citizens planning to explore India must secure an Indian visa in advance. India Visa for Senegal Citizens. The process involves an online application, document submission, and fee payment. Once approved, the visa allows entry for tourism, business, or other specific purposes. Staying informed about the latest visa requirements ensures a smooth journey to India.

    ResponderEliminar
  27. Acquiring a Turkey visa from Fiji is a vital step for Fijian travelers eager to explore the rich cultural heritage, stunning landscapes, and historical sites that Turkey has to offer. This process ensures that Fijian passport holders can embark on their Turkish adventures with ease. Travelers from Fiji can apply for their visas through the Turkish consulate or embassy in Fiji, adhering to the required documentation and procedures. Alternatively, the convenient e-Visa system offers a streamlined and user-friendly application process, simplifying travel planning to Turkey. With the appropriate visa, Fijian adventurers can immerse themselves in the enchanting experiences awaiting them in Turkey.

    ResponderEliminar
  28. Hii everyone, Eager to explore the captivating landscapes and rich culture of Azerbaijan? Before you embark on your journey, it's essential to familiarize yourself with the e visa fee for Azerbaijan. Let's delve into the details.

    ResponderEliminar
  29. Great insights! This post offers valuable information on a topic I'm passionate about. Thank you! E Visa Gov Az is Azerbaijan's official online platform for electronic visa applications, providing a streamlined process for travelers to obtain visas for tourism or business purposes.

    ResponderEliminar
  30. Hello everyone, Embark on a hassle-free adventure with the "e Visa India from UK" application. Explore India's diverse wonders, from ancient temples to vibrant cities, by easily obtaining your electronic visa from the United Kingdom.

    ResponderEliminar
  31. I stumbled upon your blog, and it's been a game-changer for me. Your content is like a breath of fresh air, and I can't wait to explore more of your posts. Also Travelers looking for a new haven will be pleased to know that this Egyptian village rivals Bali for Digital Nomads in terms of a peaceful work environment.

    ResponderEliminar
  32. I appreciate your openness in sharing these insights with us. In the coming days, I'll certainly be joining the event as this subject matter greatly piques my interest. Kindly click on the link for additional information I'd like to share. Ethiopian Airlines Celebrates 25 Years in the US. Since its debut, the airline has contributed to increased connectivity and travel options for passengers traveling between Ethiopia and the US, further strengthening their aviation services.

    ResponderEliminar
  33. Bravo for your blog! Your adeptness at blending profound insights with eloquent storytelling is highly commendable. It's like navigating a thoughtfully planned journey through a universe of knowledge, crafted for all readers. Your skill in simplifying complex ideas is genuinely exceptional. Additionally, I want to provide key information about obtaining a Turkey visa for Indian passport. Those seeking a Turkish visa must furnish necessary documents such as their passport, completed application form, photographs, flight information, and hotel reservation. Processing times may differ, and the utilization of the online e-visa system facilitates the application procedure, guaranteeing a more seamless experience for applicants.

    ResponderEliminar

Hola, ¡gracias por comentar!
*Los comentarios ofensivos, que intenten trollear o provocar serán borrados sin excepción alguna.
*Ya no podrán comentar los anónimos, te recomendamos dar de alta o usar una cuenta de Google, LiveJournal, WordPress, TypePad, AIM u OpenID. Gracias por tu comprensión.