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Blood Circulation In 4 Species Of Barnacles Lepas Conchoderma Lepadidae

1975; Volume: 17; Linguagem: Inglês

10.5962/bhl.part.19969

0080-5947

B R Burnett,

Physiological and biochemical adaptations

Circulatory morphologies of the primitive lepadomorphans Lepas anatifera, L. pectinata pacifica.L. fasicularis and Conchoderma virgatum are similar, but major differences appear in vessel caliber and refinement of the basic system.The smaller species (L.fasicularis and L. pectinata pacifica) have larger vessels for their body size than the larger species (Z,.anatifera and C. virgatum).Circulatory organization of the lepadids is simpler than that of Pollicipes polymerus (Scalpellidae) and Balanus tintinnahulum (Balanidae).The lepadid rostral vessel, which is morphologically similar to that of P. polyments, is interpreted as a vestige of the heart.Pump function can be attributed to the rostral sinus (the blood pump), which is apparently a remnant of the pericardial sinus.Transfer of hemolymph pumping from the heart to the rostral sinus probably occurred with the development of the peduncle.Detailed accounts of cirriped circulation may be found in Cannon (1947) andBurnett (1972).The circulatory systems of Lithotrya valentiana and Pollicipes polymerus (Cannon, 1947) had been considered to represent the general condition for thoracican Cirripedia (e.g.Maynard, 1960).However, Burnett (1972) showed that the circulatory system of the pedunculate barnacle Pollicipes polymerus was unlike that of other Crustacea.In order to obtain a more complete understanding of circulatory relationships in the Cirripedia, I studied the circulatory systems of four species of Lepadidae: Lepas anatifera, L. pectinata pacifica, L. fasicularis and Conchoderma virgatum.