Setal development and moult staging in the shrimp Crangon crangon (L.) (Crustacea: Decapoda: Crangonidae)
In: Ophelia: International Journal of Marine Biology. Ophelia Publications: Helsingør. ISSN 0078-5326, more
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| Keywords |
Crangon crangon (Linnaeus, 1758) [WoRMS]
Marine/Coastal |
| Author keywords |
Moult cyle; Moult staging; Setogenesis |
| Abstract |
The moult cycle of the shrimp Crangon crangon (L.) (Crustacea: Decapoda) was divided into sequential moult stages on the basis of setal development (setogenesis) and associated changes to the epidermis and underlying tissue on the inner edge of the outer uropods. The events observed follow the pattern for less-heavily calcified (natant) crustaceans described in the classical scheme of Drach & Tchernigovtzeff (1967), though several structural and temporal differences are apparent. A number of setogenetic features not included in that scheme were found to be useful criteria for moult staging C. crangon. The scheme is derived from light microscopy observations of the intact uropods of live male and female (ovigerous and non-ovigerous) C. crangon of 0.4 — 4.0 g wet weight from a British population. The 10 principal moult stages identified, namely Aj, A2, B, C, Do, D1; D2, D3, D4, and E, are depicted in representative photographs with accompanying text. The technique provides a simple and rapid means for moult staging C. crangon, and as excision of appendages is not required, is well suited to repetitive staging of individuals. |
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