These genes were first shown to be arranged into a physically-linked chromosomal cluster in amphioxus, an invertebrate with a single member of each of the three gene families.
32.
In the Amphioxus, for example, there's no complete heart; what they have is a short section of a blood vessel that's slightly more muscular.
33.
Amphioxus is still living today, despite their simple forms and a lack of organs we deem crucial for our body, such as kidneys, lungs, and the liver.
34.
The amphioxus hepatic diverticulum has been found to synthesize several substances that are similarly synthesized in the vertebrate liver .-Nunh-huh 01 : 20, 18 December 2008 ( UTC)
35.
The enterocoelic origin of coelom in Balanoglossus and Amphioxus is also of greater phylogenetic significance than the resemblances in the gill-slits, and so-called notochord and dorsal tubular nerve cord.
36.
Keratins ( also described as cytokeratins ) are polymers of type I and type II intermediate filaments, which have only been found in the genomes of chordates ( vertebrates, Amphioxus, urochordates ).
37.
:: If you go to early chordates, you're possibly looking for a little dark spot at the front tip of the nerve cord in amphioxus, the frontal eye of the lancelet.
38.
Taxonomists place lampreys and hagfish in the subphylum Vertebrata of the phylum Chordata, which also includes the invertebrate subphyla Tunicata ( sea-squirts ) and the fish-like Cephalochordata ( lancelets or Amphioxus ).
39.
The "'epipharyngeal groove "'is a ciliated groove along the dorsal side of the inside of the pharynx in some plankton-feeding early chordates, such as " Amphioxus ".
40.
Only a few months before he died Garstang had drafted a communication to " Nature " to put forward his latest suggestion that " Amphioxus " might be regarded as a paedomorphic ammocoete-like larva of a Stensio.
