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Ultrastructural changes in the midgut epithelium of the first larva of Allacma fusca (Insecta, Collembola, Symphypleona)
Author(s) -
RostRoszkowska Magdalena M.,
Poprawa Izabela,
Swiatek Piotr
Publication year - 2007
Publication title -
invertebrate biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.486
H-Index - 42
eISSN - 1744-7410
pISSN - 1077-8306
DOI - 10.1111/j.1744-7410.2007.00105.x
Subject(s) - midgut , biology , ultrastructure , epithelium , malpighian tubule system , larva , anatomy , microbiology and biotechnology , yolk , columnar cell , lumen (anatomy) , botany , ecology , genetics
. In the newly hatched larva in Allacma fusca , the midgut epithelium was fully developed and formed by flattened epithelial cells surrounding the yolk mass in the midgut lumen. Immediately after hatching, the first larva began to feed; the migut lumen was filled with the yolk mass and food (mainly algae). Regenerative cells typical of the developing midgut epithelium of many insects were not observed. Initially, midgut cells of the larva were cuboidal but became columnar in shape with distinct regionalization in the distribution of cell organelles. Furthermore, urospherites appeared in the midgut cell cytoplasm, i.e., structures characteristic for the midgut epithelium of insects having no Malpighian tubules. As a result, cells with the capacity for digestion, absorption, and excretion were observed to be completely formed in the first larval stage.