. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 262 T. STACH. Table I Relevant anatomical features ami suggested functions of the coelomic system tnul the hlooil vascular system of cephalochordates; note: no correlation between anatomical features antl functions in the sume line intctitlcJ Coelom* Blood vascular system Anatomical features Functions Anatomical features Functions! Adult Epithelial lining (with intercellular junctions) present ( 16) Smooth myoepithelial cells present (Id) Free coelomocytes in perivisceral coelom regular (15, 16) Excretory cells (cyrtopodocyt
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 262 T. STACH. Table I Relevant anatomical features ami suggested functions of the coelomic system tnul the hlooil vascular system of cephalochordates; note: no correlation between anatomical features antl functions in the sume line intctitlcJ Coelom* Blood vascular system Anatomical features Functions Anatomical features Functions! Adult Epithelial lining (with intercellular junctions) present ( 16) Smooth myoepithelial cells present (Id) Free coelomocytes in perivisceral coelom regular (15, 16) Excretory cells (cyrtopodocytes) in ncphridia (<•.#., 7, 9, 1(1) Excretion ( 7, 9, 10) Propulsion of blood (6, 7) Expulsion of gametes (16) Phagocytosis (15) Storage of nutrients (16, 17) Lubrication (16) Hydrostatic skeleton (18) Part of the blastocoelic space, vessels usually delimited by connective tissue (mostly basement membranes) only: no endothelial lining present (6, 7) Ameboid hemocytes rarely present ( 6. 7, 15) No blood or respiratory pigments present (7) Endocytosis (I1)) Ultrarlltration ( 7) ? Nutrient transport ? No respiratory function! Larva Epithelial lining (with intercellular junctions) present (9, 10) Excretory cells (cyrtopodocytes) in Hatschek's nephridium (9, 10) Smooth myoepithelial cells presents Excretion (9. 10) Distribution of nutrients* ? Secretory functions ? Distribution of secretory products# Only left anterior aorta distinguishable (10, #) Part of the blastocoelic space, delimited hy dense connective tissue not by basement membrane do, #r~ Ullratiltration (9, 10) * Not considering the segmental myocoels, the medial walls of which are specialized as the locomotory trunk muscles. t Physiology and function of the circulatory system of cephalochordates have hardly been investigated, but the lack of respiratory pigment is generally assumed to indicate that this system does not play a crucial role in oxygen supply. # Present study. '.' Hypothetical function, n
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
