
With the sacred turtle of the Lake of the Returned Sword
making news lately, the question of its species identification got some attention as well. While some Vietnamese researchers believe that the creature belongs to Vietnam's own unique species,
Rafetus leloii (named after the emperor to whom the turtle lent the sword), the mainstream view is that it's in the same species,
Rafetus swinhoei, or the Giant Yangtze Softshell Turtle, with the similarly endangered turtles of the Yangtze basin in China.
The
swinhoei epithet in the species' binomial name comes from the name of
Robert Swinhoe, a British consul in China and an avid naturalist, who
sent a specimen of this turtle from Shanghai to John Edward Gray, the top turtle expert at the British Museum. The latter, accordingly, named the new species
Oscaria swinhoei. The
Oscaria in the binomial species name was replaced with the
Rafetus at some later point, when zoologists reclassified the species to the
Rafetus genus. But what does the genus name,
Rafetus, actually mean?
Although Latin in appearance, the etymology of the name
Rafetus was
somewhat baffling to the volunteer Latinists at Yahoo Answers, when somebody raised that question there a few years ago. So one has to go to the primary sources. Before the Yangtze turtle was re-classified as a
Rafetus, the
Rafetus genus was "monospecific", i.e. contained only one species, the Euphrates Softshell Turtle,
Rafetus euphraticus. While the Euphrates Turtle had been known to Western science since 1797, it got its present Latin name,
only in 1864, from the same Gray who, based on his analysis of its skeleton in the British Museum, decided to establish a separate genus for it. Somewhat surprisingly to me, Gray's paper - or his earlier monographs on the related subjects - did not explain the meaning of the Latin name for this genus, or, for that matter, for any other genus he was describing. (Were such things supposed to be transparent to the zoologists of the day? Who knows...) In any event, the name of the genus
Rafetus that Gray established in 1864 was clearly based on what he reported as the species earlier names, viz.
Testudo rafeht and, later,
Trionyx rafeht. (
Testudo was the original, Linneus', genus for all turtles;
Trionyx, a later established genus for all soft-shell turtles). Gray would also use "the rafeht" as the species' supposed common name.
But... what did "rafeht" mean? For this, we have to go to what is the
real primary source, i.e. the
Voyage of Guillome-Antoine Olivier. Olivier was the French naturalist who avoided the
unpleasant fate of Lavoisier by being sent, soon after the French Revolution, as an envoy to the Ottoman Empire and Persia. In 1797, when crossing the Euphrates on his way back to France,
he shot a large turtle, which, he said, the Arabs called
rafcht. (As he wrote in French, his
ch must stand for a sound more like the English
sh). So the species became known as
Testudo rafcht, with "rafcht" actually used as a "common name" in some publications of the time. Gray apparently misread "rafcht" as "rafet"... which I would not find entirely surprising.
And what does
rafcht (
rafšt, in a more standard Arabic transcription) mean? Arabic dictionaries don't have such a word, but they do have
rafš ( رفش ) , which means "spade" or "shovel". And, apparently,
ar-rafš (الرفش), i.e. "the spade/shovel" is still used as the common name of this creature, according to e.g. to
this leaflet of
Wildlife Middle East (which also has
an English version). So we've got here, ultimately, a (Contemporary) Latin word of Arabic origin!

Well, the shell does look like a shovel! (Photo by Reqê Firatê)
P.S. Any actual Arabic speakers are welcome to comment!