Thursday, May 30, 2013

Fwd: agnatha



---------- Forwarded message ----------
From: Lynch, Benjamin <benjamin.lynch@hanovernorwichschools.org>
Date: Thu, May 30, 2013 at 10:37 AM
Subject: agnatha
To: thermanson.1.vertebrates@blogger.com


HAGFISH

Common Name: "no jaws"
Distinguishing features: Agnatha are characterized by lacking a jaw and by having a notochord (a flexible rod-shaped body) in both larvae and in adults. They also lack paired fins and they have seven or more paired gill pouches. They are cold blooded, and they have a cartilaginous skeleton. Agnatha do not have an identifiable stomach or any appendages. Fertilization and development are both external and their heart contains 2 chambers.
Examples include hagfish and lampreys. 

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