Role of Maxilla 2 and Its Setae during Feeding in the Shrimp Palaemon adspersus (Crustacea: Decapoda)

The movements of the basis of maxilla 2 in Palaemon adspersus were examined using macro-video recordings, and the morphology of its setae was examined using both scanning and transmission electron microscopy. The basis of maxilla 2 performs stereotypical movements in the latero-medial plane and gent...

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Bibliographic Details
Published in:The Biological bulletin (Lancaster) 2003-04, Vol.204 (2), p.126-137
Main Authors: Garm, A., Hallberg, E., Høeg, J. T.
Format: Article
Language:English
Subjects:
Analysis
Animal Structures - innervation
Animal Structures - ultrastructure
Animals
Biologi
Biological research
Biological Sciences
Biology, Experimental
Biomechanical Phenomena
Canals
Cells
Cilia
Crustaceans
Developmental biology
Electron microscopy
Extracellular matrix
Feeding Behavior - physiology
Food movements
Insect morphology
Lobsters
Maxilla
Microscopy, Electron
Morphology
Morphology (Biology)
Mouthparts
Natural Sciences
Naturvetenskap
Neurobiology and Behavior
Palaemon adspersus
Palaemonidae - anatomy & histology
Palaemonidae - physiology
Physiological aspects
Sensilla
Shellfish
Shrimps
Shrimps (Animals)
Zoologi
Zoology
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Summary:The movements of the basis of maxilla 2 in Palaemon adspersus were examined using macro-video recordings, and the morphology of its setae was examined using both scanning and transmission electron microscopy. The basis of maxilla 2 performs stereotypical movements in the latero-medial plane and gently touches the food with a frequency of 3-5 Hz. The medial rim of the basis of maxilla 2 carries three types of seta. Type 1 is serrate, type 2 and 3 are serrulate, and type 2 has a prominent terminal pore. Type 2 is innervated by 18-25 sensory cells whose cilia protrude through the terminal pore and are in direct contact with the external environment. The structure of type 2 setae indicates that they are mainly gustatory, although still bimodal due to their innervation by presumed chemosensory and mechanosensory neurons. Distally, the three types of setae have a complex arrangement of the cuticle involving water-filled canals, which may serve to improve flexibility. Type 1 and 3 setae have fewer sensory cells (4-9) but probably also have a bimodal sensory function. The function of type 1 setae is probably to protect type 2 setae, while type 3 setae might serve to groom the ventral side of the basis of maxilla 1.
ISSN:0006-3185
1939-8697
DOI:10.2307/1543548