macrocrustacean of warri river (original) (raw)
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Foregut morphology of Macrobrachium carcinus (Crustacea, Decapoda, Palaemonidae)
Acta Amazonica, 2016
Macrobrachium carcinus is a Brazilian native prawn with recognized potential for use in aquaculture activities. The aim of this study was to describe and illustrate in detail the morphology of the M. carcinus foregut. The foregut comprises the mouth, esophagus and stomach. It is lined by a simple cylindrical epithelium overlain by chitinous cuticle. The cardiac chamber is well supplied with muscles and lined with chitin thickened in places to form a complex, articulating set of ossicles. The ossicles and setae inside the cardiac chamber seem to direct the food movement through the cardiac chamber and sort the food according to particle size as digestion takes place. Twenty-one basic ossicles were observed in the stomach ofM. carcinus and are divided into seven categories, reflecting their presumed functional roles. The significance of these morphological features is discussed in terms of its implication in feeding management that can support future commercial farms of this important...
2010
Contents. -Introduction -General -Diagnosis -Number of species and size. External morphology -Cephalothorax -Pleomeres -Appendages. Internal morphology -Digestive system -Nervous system -Reproductive system. Embryology and larval development. Ecology and ethology -Symbiosis. Fossil record. Systematics. Appendix: checklist of species. Bibliography. © Koninklijke Brill NV, Leiden, 2010 Crustacea 9A (65): 215-265 216 J. W. GOY the family tree of Decapoda. However, they are a relatively homogenous group found in a variety of both shallow warm water and deep-sea benthic marine habitats.
Arthropod Structure & Development, 2009
Based on traditional techniques and confocal laser scanning microscopy for external morphology, and immunohistochemistry for the muscular system, we describe here the segmental features of the antennal exopod of Artemia nauplii. Two kinds of serial elements are present, i.e. setae (with cuticular folds at their base) and ringlets (serially arranged sclerites separated by joint-like cuticular folds not extending to form complete rings around the appendage). The two series are usually not in register. The cuticular folds of the setae and of the ringlets are also sites of intermediate insertions of the three exopod muscles: as the two tegumentary structures are discordant in periodicity, this is also mirrored in the pattern of muscle insertions on the two sides of the appendage. Similar cases of segmental mismatch are known for the trunk of several arthropods, but segmental mismatch along the appendages has received very little attention. The occurrence of segmental mismatch in the naupliar appendages of both extant and fossil crustaceans is reviewed and it is suggested here to be a primitive feature of the exopods of both second antennae and mandibles. Problems in the interpretation of morphological evidence are discussed, also in relation to development and evolution of segmentation of naupliar appendages.
Marine Plankton: A practical Guide to Ecology, Methodology and Taxonomy. Oxford Scholarship Online, 2018
This chapter describes the taxonomy of the Decapoda, the most species-rich order of Crustacea, with over 14,500 described extant species worldwide, commonly called shrimps, prawns, lobsters, or crabs. Decapods exhibit a vast diversity in shape, size, and colour. The chapter covers their life cycle, ecology, general morphology, and larval measurements. It includes a section that indicates the systematic placement of the taxon described within the tree of life, and lists the key marine representative illustrated in the chapter (usually to genus or family level). This section also provides information on the taxonomic authorities responsible for the classification adopted, recent changes which might have occurred, and lists relevant taxonomic sources.