Exterior morphology of the burrowing barnacle Trypetesa lampas (Cirripedia, Acrothoracica)статья
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Аннотация:The external morphology of females and a dwarf male of T. lampas were studied. The mantle sack exhibits the structures common to all acrothoracicans, such as: single teeth with associated simple setae on the apertural lips; feeble multifid scales on the apertural lips and ventral part of the opercular region; small mantle teeth and minute multifid setae scattered on most parts of the mantle sac. The variable denticles were found on the internal side of the apertural lips. The big saddle-like labrum and the protopodit of the mouth cirri have an armament similar to lithoglyptid acrothoracicans; both rami of the mouth cirri are covered with a dense carpet of villiform denticles. The thoracic tappets are reduced to separate and short multifid scales. The body of the dwarf male lacks cuticular ribs and is covered with minute denticles. Trypetesidae exhibit many charactersistic in common with the Lithoglyptidae: similar form of the mantle sac, a big aperture, well-developed labrum and mouth cirri, absence of gut teeth or gizzard, presence of minute denticles on the male cuticle, form and structure of cyprids. In contrast, the Cryptophialidae differs strongly from both the Lithoglyptidae and the Trypetesidae in these charactersistic.