Regeneration of the inhalant siphon of Donax hanleyanus (Philippi, 1847) (Bivalvia, donacidae) from Argentina
Donax hanleyanus (Philippi, 1847) is the southernmost Donax species in the American Atlantic. It inhabits intertidal fine grain sandy shores in northern Buenos Aires Province. As with other species in this genus, these animals survive under pressure of "cropping" by fish that feed on their...
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| Autores principales: | , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_07308000_v20_n1_p149_Luzzatto |
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| Sumario: | Donax hanleyanus (Philippi, 1847) is the southernmost Donax species in the American Atlantic. It inhabits intertidal fine grain sandy shores in northern Buenos Aires Province. As with other species in this genus, these animals survive under pressure of "cropping" by fish that feed on their siphons. The inhalant siphon is a complex organ; its tip contains a system of branched tentacles that permit particle selection of medium and large grains and prevent their entry to the pallial cavity of the animal. To estimate the regeneration speed of the amputated siphon under laboratory conditions, a study of the regrowth sequence after an artificial cut was performed at regular intervals for complete 10-day periods. The observations in vivo under the microscope were correlated with those made by histology at the same time intervals. Results indicate that at 24 h after amputation, rudiments of the primary tentacles are observed, and the siphon is fully active in selecting particles at the fifth day (i.e., the process of regeneration of the primary, secondary, and tertiary tentacles is completed within ∼5 days). After this, a period of growing and tentacle ramification follows, even though the result is a siphon with tentacles less ramified than the original. |
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