The interna of the rhizocephalan Peltogaster reticulata: Comparative morphology and ultrastructure

Specialized morphology of diverse parasitic crustaceans reflects their adaptations to an endoparasitic lifestyle. Rhizocephalan barnacles are one of the most highly modified obligatory parasites of other crustaceans. Comprehension of the functional morphology of rhizocephalans could elucidate the ma...

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Bibliographic Details
Published in:Arthropod structure & development 2022-09, Vol.70, p.101190-101190, Article 101190
Main Authors: Miroliubov, Aleksei A., Lianguzova, Anastasia D., Ilyutkin, Stanislav A., Arbuzova, Natalia A., Lapshin, Nikita E., Laskova, Ekaterina P.
Format: Article
Language:English
Subjects:
Cirripedia
Host-parasite interaction
Interna
Muscular system
Parasitic barnacles
Rhizocephala
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Summary:Specialized morphology of diverse parasitic crustaceans reflects their adaptations to an endoparasitic lifestyle. Rhizocephalan barnacles are one of the most highly modified obligatory parasites of other crustaceans. Comprehension of the functional morphology of rhizocephalans could elucidate the main evolutionary trends not only inside parasitic barnacles, but in parasitism as a whole. Despite that, the available morphological information on the rhizocephalans is very fragmented. In this study, we examined the organization and ultrastructural features in different parts of the interna of Peltogaster reticulata (fam. Peltogastridae). The main trunk cuticle is much thicker than that of the side branches due to the different functions of these body parts. The central lumen in the main trunk is lined by an extracellular matrix, while the side branches are not. Muscular fibers are only present in the body wall of the main trunk, where they are organized as a “wicker basket”. Furthermore, functional differentiation can be found at the ultrastructural level in the cells of the rootlets: there are distinct cell types both in hypodermal and axial cell layers. The rootlets of P. reticulata are covered by a network of the host's neurons and capillaries. •The interna of Peltogaster reticulata is morphologically and ultrastructurally heterogeneous.•The central lumen of the main trunk is lined with extracellular matrix.•The muscular system resembling a “wicker basket” is present in the main trunk.•The rootlets are enlaced by a network of the host neurons and capillaries.
ISSN:1467-8039
1873-5495
DOI:10.1016/j.asd.2022.101190