By Joel W. Martin, Keith A. Crandall, Darryl L. Felder
Decapod crustaceans are of large curiosity and significance evolutionarily, ecologically, and economically. there isn't any scarcity of courses reflecting the wide range of principles and hypotheses referring to 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. according to the findings offered via a global workforce of scientists at a symposium supported via the Society for Integrative and Comparative Biology, The Crustacean Society, and several societies, and with significant investment from the nationwide technology beginning, Decapod Crustacean Phylogenetics offers a finished synopsis of the present wisdom of this huge and critical staff of animals. This quantity includes cutting-edge studies of literature and methodologies for elucidating decapod phylogeny. The contributions comprise reports at the fossil beginning of decapods, morphological and molecular phylogenetic analyses, the evolution of mating and its touching on phylogeny, decapod "evo-devo" stories, decapod spermiocladistics, and phylogenetic inference. The specialists additionally current examine on initial makes an attempt to build the 1st recognized phylogenetic tree for varied teams of decapods. numerous contributions supply the main finished analyses to this point on significant clades of decapods, and others introduce information or techniques that may be utilized in the long run to aid unravel the phylogeny of the Decapoda. at the moment, the Decapoda comprise an envisioned 15,000 species, a few of which help seafood and marine industries worthy billions of bucks every year to the world’s economic climate. This quantity is an engaging assessment of the place we're presently in our realizing of those vital creatures and their phylogeny and likewise offers a window into the way forward for decapod study. This paintings could be of serious curiosity to researchers, teachers, and scholars in marine biology, evolutionary biology, crustacean biology, source administration, and biodiversity database administration.
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4%), with a higher level of divergence between Euastacus robertsi and Calappa gallus within Pleocyemata (17%). Although we were able to amplify genomic fragments of the EF-2 gene with currently designed primer sets (see Table 1), an intron was located at base pair position 860 relative to mRNA in Libinia emarginata (GenBank accession AY305506). The intron may be useful for species/genera level studies, although preliminary analysis suggests it is fewer than 300 base pairs in caridean (Hippolytidae) and brachyuran (Calappidae, Leucosiidae, Goneplacidae, Majidae, Cyclodorippidae) decapods.
They have the same length and segment number as the pereopods and are not kept closely attached to the mouth field. Accordingly, the question arises as to whether the stem species of decapods was equipped with only two pairs of maxillipeds and hence six pairs of pereopods (see Scholtz & Richter 1995; Richter & Scholtz 2001)—in other words, whether it was a dodecapod (dodeka: Greek for twelve) rather than a true decapod. In their seminal work, Averof and Patel (1997) developed a new molecular criterion for maxillipeds.
Mol. Phylogenet. Evol. 48: 359–368. D. C. 1997. The Strepsiptera problem: phylogeny of the holometabolous insect orders inferred from 18S and 28S ribosomal DNA sequences and morphology. Syst. Biol. 46: 1–68. F. 2002. Mecoptera is paraphyletic: multiple genes and phylogeny of Mecoptera and Siphonaptera. Zool. Scr. 93–104. A. ABSTRACT Apart from larval characters such as zoeal spines and stages, developmental characters are rarely used for inferences on decapod phylogeny and evolution. In this review we present examples of comparative developmental data of decapods and discuss these in a phylogenetic and evolutionary context.
Decapod Crustacean Phylogenetics (Crustacean Issues) by Joel W. Martin, Keith A. Crandall, Darryl L. Felder