The Morphology of the Mandibles of the Larval and Adult Lobster Shrimp Boasaxius princeps and Leonardsaxius amurensis (Decapoda: Axiidea: Axiidae)

The morphology of the mandibles in the lobster shrimps Boasaxius princeps and Leonardsaxius amurensis is described at different stages of ontogenesis. The incisor process of the mandibles in axiid zoeae is flattened antero-posteriorly, with three stout terminal teeth; the molar process is broad, the...

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Bibliographic Details
Published in:Russian journal of marine biology 2020-07, Vol.46 (4), p.257-269
Main Authors: Kornienko, E. S., Golubinskaya, D. D.
Format: Article
Language:English
Subjects:
Aquatic crustaceans
Biomedical and Life Sciences
Boasaxius princeps
Developmental stages
Freshwater & Marine Ecology
Larvae
Leonardsaxius amurensis
Life Sciences
Mandible
Marine crustaceans
Morphology
Original Papers
Ridges
Spine
Zoeae
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Summary:The morphology of the mandibles in the lobster shrimps Boasaxius princeps and Leonardsaxius amurensis is described at different stages of ontogenesis. The incisor process of the mandibles in axiid zoeae is flattened antero-posteriorly, with three stout terminal teeth; the molar process is broad, the grinding surface is formed by transverse cuticular ridges and bears a fringe of brush-like projections on the anterior edge of the left mandible and on the posterior edge of the right mandible; between the terminal teeth of the incisor process and the molar process is a spine row formed by groups of spines. The general plan of the structure of the mandibles is retained in all zoeal stages; the number of transverse ridges on the molar process and the number of spine groups in the spine row increase as the larvae develop. In the megalopa stage, the mandible shape changes: the incisor process becomes broad and concave, the molar process is perpendicular to it; spines and ridges on the grinding surface of the molar process become reduced, small spines on the incisor process are retained on the cutting edge. Adult lobster shrimp lack cuticular structures on the molar and incisor processes of the mandibles. Despite the marked differences in the adult mandible morphology, the mandibles of the zoeae of Axiidea show similarity to the mandibles of the larvae of some caridean shrimps (e.g., the family Lysmatidae).
ISSN:1063-0740
1608-3377
DOI:10.1134/S1063074020040045