By Joel W. Martin, Keith A. Crandall, Darryl L. Felder
Decapod crustaceans are of large curiosity and value evolutionarily, ecologically, and economically. there's no scarcity of guides reflecting the wide range of rules and hypotheses touching on decapod phylogeny, yet till lately, the world’s major decapodologists had by no means assembled to clarify and talk about relationships one of the significant decapod lineages and among decapods and different crustaceans. in response to the findings awarded through a world crew of scientists at a symposium supported through the Society for Integrative and Comparative Biology, The Crustacean Society, and several societies, and with significant investment from the nationwide technology origin, Decapod Crustacean Phylogenetics presents a finished synopsis of the present wisdom of this mammoth and significant crew of animals. This quantity comprises cutting-edge reports of literature and methodologies for elucidating decapod phylogeny. The contributions contain stories at the fossil beginning of decapods, morphological and molecular phylogenetic analyses, the evolution of mating and its touching on phylogeny, decapod "evo-devo" experiences, decapod spermiocladistics, and phylogenetic inference. The specialists additionally current learn on initial makes an attempt to build the 1st recognized phylogenetic tree for varied teams of decapods. numerous contributions supply the main finished analyses thus far on significant clades of decapods, and others introduce information or techniques which may be utilized in the long run to aid get to the bottom of the phylogeny of the Decapoda. at present, the Decapoda comprise an anticipated 15,000 species, a few of which aid seafood and marine industries worthy billions of bucks every year to the world’s financial system. This quantity is an engaging evaluate of the place we're at present in our figuring out of those very important creatures and their phylogeny and likewise offers a window into the way forward for decapod examine. This paintings may be of significant curiosity to researchers, teachers, and scholars in marine biology, evolutionary biology, crustacean biology, source administration, and biodiversity database administration.
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Extra resources for Decapod Crustacean Phylogenetics (Crustacean Issues)
1981, 1999). On the other hand, if we accept the analysis of Richter and Scholtz (2001), the pattern must have evolved in the stem lineage of Caridoida (Fig. 2). However, it might be even older since similar patterns occur in some non-malacostracan crustaceans (K¨uhn 1913; Fuchs 1914, see Alwes & Scholtz 2004) (Fig. 2). In either case, this corresponding early development of euphausiids and dendrobranchiate decapods to the exclusion of Pleocyemata strongly suggests that originally decapods did not care for the brood but released their yolk-poor eggs freely into the water.
A1, a2 = 1st and 2nd antennae, lr = labrum, ol = optic lobe). (B) Ventral view of the germ band of an embryo of the crayfish Cambaroides japonicus (labels as in A). Note the higher number of cells compared to A. (C) Transverse section through the caudal papilla of the American lobster Homarus americanus at the level of the teloblast rings; 19 ectoteloblasts (one unpaired E0 and nine paired E1 to E9 teloblast cells) and 8 mesoteloblast (four pairs in a specific arrangement) surround the forming proctodaeum (pr).
The early development is quite different between Dendrobranchiata and Pleocyemata. , Brooks 1882; Zilch 1978, 1979; Hertzler & Clark 1992; Hertzler 2005; Biffis et al. in prep) (Fig. 1). They hatch as nauplius larvae (Scholtz 2000). Pleocyematans mostly possess relatively large, yolky eggs with a superficial or mixed cleavage, no recognizable cell division pattern, and an immobile embryonized egg-nauplius (see Scholtz 2000; Alwes & Scholtz 2006). , Weldon 1887; Gorham 1895; Scheidegger 1976), but these cleavages never show a consistent pattern comparable to that of Dendrobranchiata.