It is the locomotory organ in Molluscs. According to evolutionary biologist Neil Shubin, one theory for the strange holes is that they're an "evolutionary remnant of fish gills", reports Business Insider. The top lip along with the jaw and palate started life as gill-like structures on your neck. For example, when the gills are two in number, two auricles are present as encountered in Octopus and Loligo. 7) Coccyx Your coccyx, better known as your tailbone, is the very last part of your vertebrae, and is the remnant of a lost tail. This organ is quite uncommon and strange to others. It is regarded as the remnant of the ‘dermo-muscular tube’ of the ancestral form whose ventral side became greatly […] The presence of pharyngeal slits in hemichordates led to debates of whether this structure was homologous to the slits found in chordates or a result of convergent evolution. [8] Evidence for evolution is continually being gathered and tested; consequently, scientists argue that evolution is both a fact and a theory. Evolutionary biologists claim this is a remnant instinct from when early ground-dwelling mammals would climb trees when threatened. [1] The evolutionary model, however, is a precise fit; especially when one considers fish anatomy. In fish, several branches extend from the vagus nerve, each looping around arterial arches that connect the dorsal and ventral aorta between each gill slit (Ridley, 2004, p.281-282; Berry & Hallam, 1989, p.83). The number of gills are directly proportional to the number of the auricles (Fig. ADVERTISEMENTS: Meaning and Origin of Foot: Phylum Mollusca is characterised by the pronounced development of musculature known as the foot. According to Business Insider, one evolutionary biologist, Neil Shubin, says the holes could be an "evolutionary remnant of fish gills." Published: 11 June 2008 (GMT+10) Photo Stockxpert The coccyx (tailbone) has long been wrongly thought to be vestigial by evolutionists ‘Vestigial’ organs have been used as an argument against a designer for many years, and have been used as a major ‘proof’ of evolution. Teleostei / t ɛ l iː ˈ ɒ s t iː aɪ / (Greek: teleios "complete" + osteon "bone"), members of which are known as teleosts / ˈ t ɛ l iː ɒ s t s /, is by far the largest infraclass in the class Actinopterygii, the ray-finned fishes, containing 96% of all extant species of fish.Teleosts are arranged into about 40 orders and 448 families.Over 26,000 species have been described. With the placement of hemichordates and echinoderms as a sister group to chordates, a new hypothesis has emerged-suggesting that pharyngeal gill slits were present in the deuterostome ancestor . Well who knows maybe they are too, but if you should have a similar condition, there is nothing to worry about as these are harmless and insignificant disorders of the body. Evolutionary biologist Neil Shubin believes that this tiny hole is a throwback to when our ancestors were first coming out of the water. Anatomical clues to human evolution from fish. One evolutionary biologist Neil Shubin stated that they could be an evolutionary remnant of fish gills. 16.67). According to him, they are an “evolutionary remnant of fish gills” which is pretty amazing if you think about it. Vestigial arguments: remnants of evolution. by Shaun Doyle. The heart and the gills are intimately related because the main function of the gills is to aerate blood on its way to the heart.