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Postcranial Myology of the California Newt, Taricha torosa
 

Summary: Postcranial Myology of the California
Newt, Taricha torosa
JULIA C. WALTHALL AND MIRIAM A. ASHLEY-ROSS*
Department of Biology, Wake Forest University, Winston-Salem, North Carolina
ABSTRACT
Salamanders are generally agreed to represent the primitive tetrapod
body plan, as well as a postural analog for early tetrapods. Dissection and
description of the muscles of the forelimb, trunk, and hindlimb of the
California newt, Taricha torosa, were undertaken to provide baseline data
on the locomotor structures in this species. Hypaxial trunk muscles are
similar to those of other vertebrates. As in other salamanders, limb muscles
show a simple parallel-fibered architecture and often span multiple joints.
Several differences in limb musculature were also noted. The extensor
iliotibialis muscle possesses a single head in T. torosa, rather than the two
heads common in larger salamander species. The ischioflexorius muscle,
while divided into proximal and distal sections, is not distinct from the
puboischiotibialis in its proximal portion. The femorofibularis is enlarged in
this species; it is suggested that the femorofibularis and ischioflexorius
muscles may be functionally analogous systems. Forelimb and hindlimb
musculature show similar morphological patterns, particularly in distal

  

Source: Ashley-Ross, Miriam A. - Department of Biology, Wake Forest University

 

Collections: Environmental Sciences and Ecology; Biology and Medicine