. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Fiber Myofibril Triad (Perifibrillar) Triad (Intrafibrillar). Fiber Myofibril Triad (Perifibrillar) Figure 4. Stylized cross-sectional views of single muscle fibers amongst crustaceans, showing distribution of triads and subdivision into myonbrils. A. Single fiber not subdivided into myofibrils and with scat- tered triads as in the ostracod Cypnclopsis vidua (Fahrenbach. 1964) and the cephalocand macracantha (present report). B. Single fiber subdivided into myofibrils by longitudinally running sarcoplasmic
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Fiber Myofibril Triad (Perifibrillar) Triad (Intrafibrillar). Fiber Myofibril Triad (Perifibrillar) Figure 4. Stylized cross-sectional views of single muscle fibers amongst crustaceans, showing distribution of triads and subdivision into myonbrils. A. Single fiber not subdivided into myofibrils and with scat- tered triads as in the ostracod Cypnclopsis vidua (Fahrenbach. 1964) and the cephalocand macracantha (present report). B. Single fiber subdivided into myofibrils by longitudinally running sarcoplasmic reticulum and with triads located along the periphery of the myofibril (penfibrillar location) as well as within the myofibril (mtrafibrillar lo- cation), as in the copepod Macrocyclops albidus (Fahrenbach. 1963). C. Single fiber subdivided into myofibrils by sarcoplasmic reticulum and with triads located along the periphery of the myofibril (penfibrillar lo- cation), as in the majority of crustaceans, including stomatopods, am- phipods. and decapods. Literature Cited Atwood, H. L. 1973. An attempt to account for the diversity of crus- tacean muscle. Am. Zool. 13: 357-378. Atwood, H. L. 1976. Organization and synaptic physiology of crusta- cean neuromuscular systems. Prog. Nenrobiol. 7: 291-391. Elofsson, R., and R. R. Messier. 1990. Central nervous system of Hutchinsoniella macracantha (Cephalocarida). J. Crust. Bio/ 10: 423-439. Elofsson. R., and R. R. Messier. 1991. Sensory morphology in the antennae of the cephalocarid Hutchinxoniella macracantha. J. Crust. Bin/ II: 345-355. Elofsson, R., and R. R. Messier. 1992. Monoaminergic and peptidergic neurons in the nervous system of Hutchinsoniella macracantha (Cephalocarida). / Crust. Bioi 12: 531-536. Elofsson, R., R. R. Messier, and A. V. Messier. 1992. Digestive system of the cephalocand Hiitchinsonie/la macracantha. J Crust Bioi 12: 571-591. Fahrenbach, \V. M. 1963. The sarcoplasmic reticulum of striated muscle of a cyclopoid
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