Abstract
It was made the characterization of marginal sphincter to the species Phymactis clematis (Drayton in Dana, 1849) and Aulactinia marplatensis (Zamponi, 1977), from intertidal ecosystem through their morphogical and functional study. The species P. clematis has a circumscript sphincter of palmate type. This muscle is constituted by a mesogloeal axis and several mesogloeal subaxes. Axis as well as subaxes give a support to the endoderm which border is smooth. Aulactinia marplatensis has a circunscript sphincter pinnate type. The axis has a truncated cone shape while in P. clematis the shape is cylindrical on its origin and it is bifurcated at the end. Both species experiments were carried out using the isolated muscles. They were stimulated at increasing KCl concentrations ranging from 20 to 200 mM. The results were analysed in the form of dose-response curves expressed in tension in grams force vs concentration. Contractil force increases in a sigmoid form to increasing KCl concentrations. The correlation between morphology and function and the differences shown in both species would be related to their intertidal distribution.
Highlights
Aulactinia marplatensis is distributed on the vertical walls on the rocks, unlike P. clematis whose distribution is extended over plane and horizontal hollows
The species Phymactis clematis has a smooth edge sphincter of the circumscript type, which presents constant physiological activity even if it is exposed to environmental dissecation (PATRONELLI et al, 1999)
Aulactinia marplatensis is found in the same study area and its sphincter presents folded edges, making a stronger structure
Summary
Estudio morfológico y funcional del esfínter marginal de las anémonas de mar Phymactis clematis y Aulactinia marplatensis del intermareal de Mar del Plata, Argentina. Se realizó la caracterización de las anémonas de mar Phymactis clematis (Drayton in Dana, 1849) y Aulactinia marplatensis (Zamponi, 1977) del ecosistema intermareal mediante estudio morfológico y funcional. According to the disposition of mesogloeal axis and subaxes the sphincter can be classified as circumscript, circumscript-diffuse or diffuse (MANUEL, 1981) These morphological types may present structural and physiological differences depending on the species located in intertidal or depth environment (PATRONELLI et al, 2004). The aim of this work is to make a comparative study of the marginal sphincter of both species by morphological and functional analysis
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