Lethbridge R C, Potter I C
School of Environmental and Life Sciences, Murdoch University, Murdoch, Western Australia 6153.
J Morphol. 1980;164(1):39-46. doi: 10.1002/jmor.1051640104.
The number of mucous, club, and granular cells in the epidermis, and the number of rows of subcutaneous adipose cells, as well as the thickness of the epidermis and the dermal collagen layer, have been recorded for the larval and metamorphosing stages of the anadromous parasitic lamprey, Lampetra fluviatilis, and for the larval, metamorphosing, and adult stages of the nonparasitic lamprey, Lampetra planeri. In L. fluviatilis, the mucous cells predominated in all stages but were more abundant in fully metamorphosed individuals than in larvae. During metamorphosis, the number of granular cells increased continuously, whereas the club cells showed little change. Although lampreys do not feed during metamorphosis, there was an increase in the thickness of the epidermis and in the dermal collagen sheath; the latter increase probably foreshadows the increase in activity by the adults. Simultaneously, there is a reduction in the subcutaneous fat layer, which can be attributed to mobilization of lipid as an energy source. Changes similar to those just described for L. fluviatilis were also found in metamorphosing L. planeri. However, the pattern altered markedly during adult stages in this nonparasitic species. There were marked declines in the number of cells, in the thickness of the epidermis, in the width of the collagen sheath, and in the quantity of subcutaneous fat.
已记录了溯河洄游寄生七鳃鳗（Lampetra fluviatilis）幼体和变态阶段以及非寄生七鳃鳗（Lampetra planeri）幼体、变态阶段和成体阶段表皮中黏液细胞、棒状细胞和颗粒细胞的数量、皮下脂肪细胞的排数，以及表皮和真皮胶原层的厚度。在L. fluviatilis中，黏液细胞在所有阶段均占主导，但在完全变态的个体中比在幼体中更为丰富。在变态过程中，颗粒细胞数量持续增加，而棒状细胞变化不大。尽管七鳃鳗在变态期间不进食，但表皮厚度和真皮胶原鞘厚度有所增加；后者的增加可能预示着成体活动的增加。同时，皮下脂肪层减少，这可归因于脂质作为能量来源的动员。在变态的L. planeri中也发现了与上述L. fluviatilis相似的变化。然而，在这种非寄生物种的成体阶段，模式发生了明显改变。细胞数量、表皮厚度、胶原鞘宽度和皮下脂肪量均显著下降。
