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It is thought that this was the result of descent from a common venom-producing squamate ancestor; the hypothesis was described simply as the "venom clade" when first proposed to the scientific community. [2] The venom clade included Anguidae for phylogenetic reasons and adopted a previously suggested clade name: Toxicofera. [14]
The single origin hypothesis also suggests that venom systems subsequently atrophied, or were completely lost, independently in a number of lineages. [20] The phylogenetic position of Iguania within Toxicofera is supported by most molecular studies, but not by morphological ones. [30] The "Toxicoferan hypothesis" was subsequently challenged.
Evidence has recently been presented for the Toxicofera hypothesis, that venom was present (in small amounts) in the ancestors of all snakes (as well as several lizard families) as "toxic saliva" and evolved to extremes in those snake families normally classified as venomous by parallel evolution.
Cassowaries are ratites, meaning they are flightless. They’ve also earned the dubious distinction of being “the world’s most dangerous bird.” Its more famous flightless cousin, the emu, is ...
Research into development of vaccines that will lead to immunity is ongoing. Bill Haast , owner and director of the Miami Serpentarium, injected himself with snake venom during most of his adult life, in an effort to build up an immunity to a broad array of venomous snakes, in a practice known as mithridatism .
Goldman Sachs chief equity strategist David Kostin wrote in a recent note to clients that the current market is more "micro driven," meaning company-specific details are influencing stock moves ...
Struck Gogh-ld. A newly discovered Vincent van Gogh painting worth $15 million was likely found at a dusty Minnesota garage sale — where a buyer plunked down less than $50 for the world-famous ...
Recent research suggests that the evolutionary origin of venom may exist deep in the squamate phylogeny, with 60% of squamates placed in this hypothetical group called Toxicofera. Venom has been known in the clades Caenophidia , Anguimorpha , and Iguania , and has been shown to have evolved a single time along these lineages before the three ...