التيكتاليك Tiktaalik //، هوأحادي النوع من لحميات الزعانف المنقرضة من أواخر العصر الديڤوني، وتتميز بالكثير من الخصائص المشابهة لذوات الأربع. وهي مثال من الخطوط المتنوعة للتكيفات المتطورة للحميات الزعانف للانتنطق إلى الموائل الضحلة التي تفتقر للأكسجين، مما إدى إلى تطور رباعية الأطراف. عُثر على أحفورات محفوظة بشكل جيد في 2005 على جزيرة إلـِس‌مير، في نوناڤوت، كندا.

الوصف

تمنح تيكتاليك فرصة لنظرات سابرة في سمات أقرب الأقارب المنقرضين لذوات الأربع. Unlike many previous, more fishlike transitional fossils, the "fins" of Tiktaalik have basic wrist bones and simple rays reminiscent of fingers. The homology of distal elements is uncertain; there have been suggestions that they are homologous to digits, although this is incompatible with the digital arch developmental model because digits are supposed to be postaxial structures, and only three of the (reconstructed) eight rays of Tiktaalik are post-axial. However, the proximal series can be directly compared to the ulnare and intermedium of tetrapods. The fin was clearly weight bearing, being attached to a massive shoulder with expanded scapular and coracoid elements and attached to the body armor, large muscular scars on the ventral surface of the humerus, and highly mobile distal joints. The bones of the fore fins show large muscle facets, suggesting that the fin was both muscular and had the ability to flex like a wrist joint. These wrist-like features would have helped anchor the creature to the bottom in fast moving current.

Also notable are the spiracles on the top of the head, which suggest the creature had primitive lungs as well as gills. This would have been useful in shallow water, where higher water temperature would lower oxygen content. This development من الممكن قد أدى إلى تطور فقص صدري أكثر قوة، a key evolutionary trait of land living creatures. The more robust ribcage of Tiktaalik would have helped support the animal’s body any time it ventured outside a fully aquatic habitat. Tiktaalik also lacked a characteristic that most fishes have—bony plates in the gill area that restrict lateral head movement. This makes Tiktaalik the earliest known fish to have a neck, with the pectoral girdle separate from the skull. This would give the creature more freedom in hunting prey either on land or in the shallows.

Tiktaalik is sometimes compared to gars (esp. Atractosteus spatula, the alligator gar) of the Lepisosteidae family, with whom it shares a number of characteristics:

• diamond-shaped scale patterns common to the Crossopterygii class (in both species scales are rhombic, overlapping and tuberculated);
• teeth structured in two rows;
• both internal and external nostrils;
• tubular and streamlined body;
• absence of anterior dorsal fin;
• broad, dorsoventrally compressed skull;
• dorsally placed eyes;
• paired frontal bones;
• marginal nares;
• subterminal mouth;
• lung-like organ.

فهم الأحياء العتيقة

Tiktaalik generally had the characteristics of a lobe-finned fish, but with front fins featuring arm-like skeletal structures more akin to a crocodile, including a shoulder, elbow, and wrist. The fossil discovered in 2004 did not include the rear fins and tail. It had rows of sharp teeth of a predator fish, and its neck could move independently of its body, which is not common in other fish (Tarrasius, Mandageria, placoderms, and extant seahorses being some exceptions; see also Lepidogalaxias and Channallabes apus). The animal had a flat skull resembling a crocodile's; eyes on top of its head, suggesting that it spent a lot of time looking up; a neck and ribs similar to those of tetrapods, with the ribs being used to support its body and aid in breathing via lungs; well developed jaws suitable for catching prey; and a small gill slit called a spiracle that, in more derived animals, became an ear.

The fossils were found in the "Fram Formation", deposits of meandering stream systems near the Devonian equator, suggesting a benthic animal that lived on the bottom of shallow waters and perhaps even out of the water for short periods, with a skeleton indicating that it could support its body under the force of gravity whether in very shallow water or on land. At that period, for the first time, deciduous plants were flourishing and annually shedding leaves into the water, attracting small prey into warm oxygen-poor shallows that were difficult for larger fish to swim in. The discoverers said that in all likelihood, Tiktaalik flexed its proto-limbs primarily on the floor of streams and may have pulled itself onto the shore for brief periods.Neil Shubin and Ted Daeschler, the leaders of the team, have been searching Ellesmere Island for fossils since 2000

التصنيف والتطور

Tiktaalik roseae is the only species classified under the genus. Tiktaalik lived approximately 375 million years ago. Paleontologists suggest that it is representative of the transition between non-tetrapod vertebrates (fish) such as Panderichthys, known from fossils 380 million years old, and early tetrapods such as Acanthostega and Ichthyostega, known from fossils about 365 million years old. Its mixture of primitive fish and derived tetrapod characteristics led one of its discoverers, Neil Shubin, to characterize Tiktaalik as a "fishapod".

Tiktaalik is a transitional fossil; it is to tetrapods what Aurornis is to birds, troodonts and dromaeosaurids. While it may be that neither is ancestor to any living animal, they serve as evidence that intermediates between very different types of vertebrates did once exist. The mixture of both fish and tetrapod characteristics found in Tiktaalik include these traits:

• الأسماك
  • fish gills
  • fish scales
  • fish fins
• "Fishapod"
  • half-fish, half-tetrapod limb bones and joints, including a functional wrist joint and radiating, fish-like fins instead of toes
  • half-fish, half-tetrapod ear region
• Tetrapod
  • tetrapod rib bones
  • tetrapod mobile neck with separate pectoral girdle
  • tetrapod lungs

Putative tetrapod footprints found in Poland and reported in Nature in January 2010 were "securely dated" atعشرة million years older than the oldest known elpistostegids. If this is a true tetrapod record, Tiktaalik was a "late-surviving relic" rather than the original transitional form. An alternative interpretation is that the Polish trackways, which do not have digital impressions, were made by walking fish

الاكتشاف

In 2004, three fossilized Tiktaalik skeletons were discovered in rock formed from late Devonian river sediments on Ellesmere Island, Nunavut, in northern Canada. At the time of the species' existence, Ellesmere Island was part of the continent Laurentia (modern eastern North America and Greenland), which was centered on the equator and had a warm climate.

The remarkable find was made by a paleontologist who noticed the skull sticking out of a cliff. On further inspection, the ancient animal was found to be in excellent condition for a 383-million-year-old specimen.

The discovery, made by Edward B. Daeschler of the Academy of Natural Sciences, Neil H. Shubin from the University of Chicago, and Harvard University Professor Farish A. Jenkins, Jr, was published in the April 6, 2006 issue of Nature and quickly recognized as a classic example of a transitional form. Jennifer A. Clack, a Cambridge University expert on tetrapod evolution, said of Tiktaalik, "It's one of those things you can point to and say, 'I told you this would exist,' and there it is."

The name Tiktaalik is an Inuktitut word meaning "burbot", a freshwater fish related to true cod. The "fishapod" genus received this name after a suggestion by Inuit elders of Canada's Nunavut Territory, where the fossil was discovered. The specific name roseae cryptically honours an anonymous donor.

Taking a detailed look at the internal head skeleton of Tiktaalik roseae, in the October 16, 2008, issue of Nature, researchers show how Tiktaalik was gaining structures that could allow it to support itself on solid ground and breathe air, a key intermediate step in the transformation of the skull that accompanied the shift to life on land by our distant ancestors.

مرئيات

حلقة بين السمك والحيوانات الراجلة

انظر أيضاً

• walking fish
• crocodilefish
• amphibious fish

أحفورات لحميات زعانف أخرى من العصر الديڤوني:

• سيلاكانث
• Eusthenopteron
• Gogonasus
• Ichthyostega
• Panderichthys

المصادر

وصلات خارجية

مشاع الفهم فيه ميديا متعلقة بموضوع [[commons:خطأ لوا في وحدة:WikidataIB على السطر 496: attempt to index field 'wikibase' (a nil value).|خطأ لوا في وحدة:WikidataIB على السطر 496: attempt to index field 'wikibase' (a nil value).]].

• University of Chicago website dedicated to the discovery
• Interview with Neil Shubin on The Inoculated Mind, February 12, 2008.
• Interview with Neil Shubin on Tech Nation where he discusses the discovery of the Tiktaalik, February 14, 2008.
• Lecture (presentation) by Neil Shubin about the discovery of Tiktaalik at YouTube
• Fishapod stars in music video, YouTube. Accessed on December 27, 2008.