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Help Urgently Needed!

 
 
Reply Sat 17 Nov, 2007 09:58 am
Just as 'cetacean' refers to any creature of the order which includes whales, dolphins and porpoises; what word, derived from Greek meaning 'shark', refers to any creature of the order which includes sharks, rays and skates, etc?
I have three possible answers: Elasmobranchii, Chondrichthyes or Galeocerdo. Galeocerdo seems to be the one derived from Greek for shark, but it doesn't seem to include rays and skates. Help would be appreciated.

Edit [Moderator]: Moved from Trivia & Word Games to Reference.
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contrex
 
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Reply Sat 17 Nov, 2007 11:21 am
I would pick Chondrichthyes. How much of a Greek scholar is the setter of the question? I mean, there was not one single Greek word meaning "shark". There are various Greek words for different kinds of shark e.g. lamia, galeos, rhine.

The class Chondrichthyes (Greek, chondros = cartilage, ichthys = fish) contains the cartilaginous fishes, those that have a skeleton of cartilage rather than bone.

It contains two subclasses:

Elasmobranchii

Includes skates, rays (batoidea), and sharks (selachii).

No swim bladders, five to seven pairs of gill clefts opening individually to the exterior, rigid dorsal fins, and small placoid scales. The teeth are in several series; the upper jaw is not fused to the cranium, and the lower jaw is articulated with the upper. The inner margin of each pelvic fin in the male fish is grooved to constitute a clasper for the transmission of sperm.

Holocephali

Upper jaws are fused with their skulls; they have separate anal and urogenital openings; and they lack the many sharp and replaceable teeth of sharks, having instead a few large permanent grinding tooth plates.

Galocerdos are tiger sharks.
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upandrunning
 
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Reply Sat 17 Nov, 2007 01:24 pm
Many thanks contrex, very much appreciated.
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ServiGal
 
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Reply Thu 6 Dec, 2007 08:32 pm
The class Chondrichthyes is also known as Elasmobranchia. It includes the sharks, skates, and rays. They are termed "cartilliganeous fish."
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