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Leptopalaemon gibbosus, sp. nov. Paratype <, 5.70 mm CL, QM W26845; A, first pereiopod. B, third pereiopod. C, same, dactylus and distal propodus. D, isomorphic second pereiopod. E, fourth pereiopod. F, fifth pereiopod. G, first pleopod. H, second pleopod. I, mesial view of appendix masculina and appendix interna of same. Scale bars = 1 mm.
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The freshwater shrimp family Kakaducarididae Bruce, 1993 is revised and its familial status reappraised using morphological characters and the results of a complementary molecular study (Page et al. 2008). Based on combined morphological-molecular data, the Kakaducarididae is synonymised with the Palaemonidae Rafinesque, 1815 and the monotypic genu...
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Citations
... These findings have prompted morphological reappraisals aimed at distinguishing family roles. For instance, the studies by Short et al. [11] and De Grave et al. [12] revealed shared morphological characteristics among these three families within the Palaemonidae family, thus considering them synonymous. The taxonomic status of the Palaemonidae family has also been a subject of interest in previous molecular systematic studies of the suborder Caridea. ...
To further understand the origin and evolution of Palaemonidae (Decapoda: Caridea), we determined the mitochondrial genome sequence of Palaemon macrodactylus and Palaemon tenuidactylus. The entire mitochondrial genome sequences of these two Palaemon species encompassed 37 typical genes, including 13 protein-coding genes (PCGs), 2 ribosomal RNA genes (rRNAs), and 22 transfer RNA genes (tRNAs), and a control region (CR). The lengths of their mitochondrial genomes were 15,744 bp (P. macrodactylus) and 15,735 bp (P. tenuidactylus), respectively. We analyzed their genomic features and structural functions. In comparison with the ancestral Decapoda, these two newly sequenced Palaemon species exhibited a translocation event, where the gene order was trnK-trnD instead of trnD-trnK. Based on phylogenetic analysis constructed from 13 PCGs, the 12 families from Caridea can be divided into four major clades. Furthermore, it was revealed that Alpheidae and Palaemonidae formed sister groups, supporting the monophyly of various families within Caridea. These findings highlight the significant gene rearrangements within Palaemonidae and provide valuable evidence for the phylogenetic relationships within Caridea.
... These findings subsequently led to morphological reappraisals of the characters purporting to differentiate the families. Short et al. (2013) andDe Grave et al. (2015) showed that the synapomorphies characterising the three families were also ubiquitous in Palaemonidae, and as a result, the three families were synonymised with Palaemonidae. ...
... Such parallel reductions in mouthparts are therefore probably more directly related to convergences in dietary composition, rather than host affiliation. Nevertheless, it is clear that the proposed modifications in mouthparts cannot be considered as synapomorphies for family level recognition (see also Short et al., 2013;De Grave et al., 2015). Instead of mouthparts, Bruce (1986) (and followed by Chace (1992)) characterised Anchistioidinae (= Anchistioididae) by 1) an appendix interna on the first pleopod in both sexes (which had also been noted by Borradaile (1915) and Holthuis (1952b)), 2) a telson with four pairs of 'spines' (two on the dorsum and the posterior margin, respectively), and 3) aberrant larval morphology (based on Gurney (1936)). ...
Several systematic revisions of the superfamily Palaemonoidea Rafinesque, 1815 (Natantia) have been published, with molecular studies complementing morphological examination. Yet, the true systematic positions of two families within the superfamily have remained uncertain , one of these being Anchistioididae Borradaile, 1915, the second being Desmocarididae Borradaile, 1915. We constructed a further phylogeny of Palaemonoidea based on two mito-chondrial and five nuclear markers to resolve this issue. Anchistioides Paulson, 1875 (the sole genus of Anchistioididae) is recovered nested within Palaemonidae Rafinesque, 1815, calling into question the validity of Anchistioididae as a distinct family. We also review the morphological characters that have been used to support family level status of Anchistioides including mouthparts adaptations, telson ornamentation, larval morphology, the presence of an appendix interna on the first pleopod in both sexes, and the mandible with a distally flared molar process. Although the latter two characters appear to be synapomorphic to the genus, we contend that these are ambiguous and not well founded to support the family-level status of the genus. As a consequence, and supported by the phylogenetic results, Anchistioididae is herein considered to be a synonym of Palaemonidae.
... The downstream distribution of the shrimps beyond the confluence between the north and south arm is presently unknown as is the dependence of the shrimps on constantly warm, spring waters. Apart from water temperature, water quality of Leichhardt Springs is otherwise typical of surface waters draining the highly leached, sandstone formations of Kakadu NP and western Arnhem Land (Short et al. 2013) being high in clarity, acidic, very soft and low in solutes. Key physicochemical variables at Leichhardt Springs were measured on 14 May 2003 and were as follows: turbidity < 1 NTU; pH 5.2; electrical conductivity 16 μS cm -1 ; Ca and K < 0.1 mg L -1 ; Na 0.9 mg L -1 ; Mg 0.3 mg L -1 ; and SO 4 0.2 mg L -1 . ...
Caridina biyiga sp. nov. is described from Leichhardt Springs, Kakadu National Park, Northern Territory, Australia, based on morphological and molecular data. The new species is highly distinctive among its congeners in having the dactylus of pereiopod 5 similar to the dactyli of pereiopods 3–4 and lacking the comb-like row of spiniform setae typical of the genus. The branchial formula is also distinctive for the genus in lacking an arthrobranch at the base of pereiopod 1 and in having a vestigial epipod on maxilliped 1. Despite the distinctive morphology of the new species, the molecular data did not provide strong support for the recognition of a new genus. Phylogenetic analyses of Australian Caridina using the mitochondrial 16S rDNA gene fragment placed the new species in a well-supported clade containing at least one typical species of Caridina. Within this clade, referred to as the ‘thermophila’ group, Kimura 2-parameter (K2P) genetic distances of 16S rDNA between the new species and sister taxa ranged from 5.1–6.0%. Analyses using the mitochondrial 3’ COI gene fragment from species of the ‘thermophila’ group yielded K2P genetic distances between the new species and its sister taxa ranging from 10.4–15.1%. A preliminary illustrated key to Northern Territory Caridina is provided. The conservation significance of Leichhardt Springs and its aquatic fauna are also briefly discussed.
... Dans le cas de Rimicaris et Chorocaris, les auteurs justifient la synonymie à la fois par l'analyse morphologique et par la proximité génétique de ces différentes espèces, également mise en évidence avec d'autres marqueurs (Teixeira et al., 2013). Notre analyse permet également de discuter l'hypothèse proposée par Shank et al. (1998) -Cormano et al., 2015 ;Bracken et al., 2010 ;Chan et al., 2010 ;De Grave et al., 2010, 2014Mejia-Ortiz et al., 2017 ;Short et al., 2013 ;Burukovsky, 2012 ...
De par leur originalité, certains organismes de la faune hydrothermale ont été classés dans des nouveaux groupes taxonomiques de haut rang. De précédentes études moléculaires ont permis d’en réassigner certains dans des lignées connues, occasionnant parfois d’importantes réductions de rangs taxonomiques. Par ailleurs, en phylogénie moléculaire, il est difficile d’optimiser à la fois l’échantillonnage taxonomique et le nombre de marqueurs. Cette thèse illustre cette limitation, mais fournit des avancées sur la compréhension de l’origine et l’évolution de trois groupes hydrothermaux. Chez les vers Polynoidae, l’approche multigène appliquée sur un grand nombre d’espèces suggère au moins deux événements de colonisation de ce milieu. Toutefois, le manque de résolution des marqueurs pour les nœuds profonds entrave la compréhension de l’histoire de ces colonisations. Une limitation similaire avait empêché de replacer les familles de crevettes Alvinocarididae et de crabes Bythograeidae dans leur infra-ordre respectifs (Caridea et Brachyura). Deux approches de recherche et d’identification de marqueurs sont donc testées pour ces groupes. La première, basée sur le séquençage de génome mitochondrial (facilement généralisable), résout les relations profondes des Brachyura et place les espèces de Bythograeidae disponibles proches des Xanthidae. La seconde, basée sur le séquençage de transcriptomes permet d’identifier des marqueurs suffisamment conservés pour résoudre les relations inter-familles chez les Caridea. Cette approche est moins généralisable, mais les marqueurs identifiés pourront a posteriori être recherchés dans un échantillonnage large par capture à l’aide de sonde.
... Caridean shrimps (Infraorder Caridea) constitute the second most speciose taxon within Decapoda, comprised of 36 families and containing over 3400 species (De Grave et al., 2014De Grave and Fransen, 2011;Short et al., 2013). Pasiphaeidae is a globally distributed family, including the polar regions, members of which often constitute an important component of the mesopelagic and bathypelagic planktonic communities . ...
Caridean shrimps constitute one of the most diverse groups of decapod crustaceans, nothwithstanding their poorley resolved infraoridnal relationships. One of the systematically controversial families in Caridea is the predominantly pelagic Pasiphaeidae, comprised off 101 species in seven genera. Pasiphaeidae species exhibit high morphological disparity, as well as ecological nice width, inhabiting shallow to very deep waters (> 4000 m). The present work presents the first molecular phylogeny of the family, based on a combined dataset of six mitochondrial and nuclear gene markers (12S rDNA, 16S rDNA, histone 3, sodium–potassium ATPase α-subunit, enolase and ATP synthase β-subunit) from 33 species belonged to six genera of Pasiphaeidae with 19 species from 12 other caridean families as outgroup taxa. Maximum likelihood and Bayesian inference analyses conducted on the concatenated dataset of 2265 bp suggest the family Pasiphaeidae is not monophyletic, with Psathyrocaris more closely related to other carideans than to the other five pasiphaeid genera included in this analysis. Leptochela occupies a sister position to the remaining genera and is genetically quite distant from them. At the generic level, the analysis supports the monophyly of Pasiphaea, Leptochela and Psathyrocaris, while Eupasiphae is shown to be paraphyletic, closely related to Parapasiphae and Glyphus. The present molecular result strongly implies that certain morphological characters used in the present systematic delineation within Pasiphaeidae may not be synapomorphies and the classification within the family needs to be urgently revised.
... In previous classifications (e.g., De Grave et al., 2009De Grave & Fransen, 2011) a further family was recognised, Kakaducarididae Bruce, 1993. Following the phylogenetic analysis in Page et al. (2008), Short, Humphrey & Page (2013) in a morphological reappraisal relegated this family to the synonymy of Palaemonidae. Although Palaemonoidea at superfamily level appears to indeed form a monophyletic group (Li et al., 2011), superfamilies are not often formally used any more in caridean systematics, and we herein refer to this assemblage of families as the palaemonoid clade. ...
In recent years the systematic position of genera in the shrimp families Gnathophylli-dae and Hymenoceridae has been under debate, with phylogenetic studies suggesting the families are not real family level units. Here, we review the molecular evidence as well as the morphological characters used to distinguish both families, leading to the conclusion that neither family is valid. Further, we studied the structural details of the single morphological character which distinguishes the two subfamilies (Palaemoni-nae, Pontoniinae) in Palaemonidae, as well as their phylogenetic relationship. As the supposed character distinction plainly does not hold true and supported by the phy-logenetic results, the recognition of subfamilies in Palaemonidae is not warranted. As a consequence, all three supra-generic taxa (Gnathophyllidae, Hymenoceridae, Pontoniinae) are thus herein formally synonymised with Palaemonidae.
... De Grave & Fransen (2011) listed eight families included within the superfamily Palaemonoidea with the Palaemonidae further split into two subfamilies: the Palaemoninae and the Pontoniinae. However, the family Kakaducarididae has been recently synonymised with the Palaemonidae (see Short, Humphrey & Page, 2013) leaving seven valid families. Three of these families are monogeneric (Anchistioididae, Desmocarididae and Typhlocarididae) whilst the greatest diversity of both morphology and lifestyle is found in the subfamily Pontoniinae. ...
The mandibles of caridean shrimps have been widely studied in the taxonomy and functional biology of the group. Within the Palaemonoidea the mandibles reach a high level of structural diversity reflecting the diverse lifestyles within the superfamily. However, the majority of studies have been restricted to light microscopy, with the ultrastructure at finer levels poorly known. This study investigates the mandible of nine species belonging to six of the recognised families of the Palaemonoidea using SEM and analyses the results in a phylogenetic and dietary framework. The results of the study indicate that little phylogenetic information is conveyed by the structure of the mandible, but that its form is influenced by primary food sources of each species. With the exception of Anchistioides antiguensis, all species examined possessed cuticular structures at the distal end of the pars molaris (molar process). Five types of cuticular structures are recognised herein, each with a unique form, but variable in number, placement and arrangement. Each type is presumed to have a different function which is likewise related to diet.
... De Grave & Fransen (2011) listed eight families included within the superfamily Palaemonoidea with the Palaemonidae further split into two subfamilies: the Palaemoninae and the Pontoniinae. However, the family Kakaducarididae has been recently synonymised with the Palaemonidae (see Short, Humphrey & Page, 2013) leaving seven valid families. Three of these families are monogeneric (Anchistioididae, Desmocarididae and Typhlocarididae) whilst the greatest diversity of both morphology and lifestyle is found in the subfamily Pontoniinae. ...
... The taxonomic sampling follows the hierarchical scheme of the latest revisions of the classification of Decapoda (i.e. De Grave et al. 2009, 2014De Grave and Fransen 2011;Short et al. 2013). The sampling is designed to test the monophyly at the family level and to infer inter-familial relationships using within each family as far as possible at least two species from two distinct genera. ...
... This classification is primarily based on the classification proposed by De Grave et al. (2009) using a comparative morphology approach. The Carideorum Catalogus (De Grave and Fransen 2011) and recent molecular phylogenies (Page et al. 2008b;Bracken et al. 2010;Chan et al. 2010;De Grave et al. 2010, 2014Short et al. 2013) provided five main modifications to the classification of De . First, the Procarididae were excluded from the Caridea and included in a distinct infraorder, the Procarididea (Bracken et al. 2010). ...
... Third, two genera, Eugonatonotus and Galatheacaris, were synonymized and placed in the Eugonatonotidae . Fourth, the family Kakaducarididae was synonymized with Palaemonidae (Short et al. 2013). The fifth is a just published work (De Grave et al. 2014) separating Hippolytidae into five families, namely Merguiidae, Bythocarididae, Thoridae, Hippolytidae s.s. and Lysmatidae. ...
During the past decade, a large number of multi-gene analyses aimed at resolving the phylogenetic relationships within Decapoda. However relationships among families, and even among sub-families, remain poorly defined. Most analyses used an incomplete and opportunistic sampling of species, but also an incomplete and opportunistic gene selection among those available for Decapoda. Here we test in the Caridea if improving the taxonomic coverage following the hierarchical scheme of the classification, as it is currently accepted, provides a better phylogenetic resolution for the inter-families relationships. The rich collections of the Muséum National d'Histoire Naturelle de Paris are used for sampling as far as possible at least two species of two different genera for each family or subfamily. All potential markers are tested over this sampling. For some coding genes the amplification success varies greatly among taxa and the phylogenetic signal is highly saturated. This result probably explains the taxon-heterogeneity among previously published studies. The analysis is thus restricted to the genes homogeneously amplified over the whole sampling. Thanks to the taxonomic sampling scheme the monophyly of most families is confirmed. However the genes commonly used in Decapoda appear non-adapted for clarifying inter-families relationships, which remain poorly resolved. Genome-wide analyses, like transcriptome-based exon capture facilitated by the new generation sequencing methods might provide a sounder approach to resolve deep and rapid radiations like the Caridea.
... Outback aquatic communities may also be diverse and show some narrow endemism. This is particularly the case for upland streams of higher rainfall areas of monsoonal northern Australia (Bruce 1993;Short et al. 2013) and there is also substantial variation among catchments in the composition of aquatic communities. Rivers and other wetlands in the northern Outback support most of Australia's freshwater reptile species (crocodiles, turtles and aquatic goannas), fish species and the majority of species for many aquatic invertebrate groups. ...
This publication is the first in The Outback Papers series, which Pew is commissioning to document one of the the last extensive natural regions left on our planet - its values, threats to its health and the opportunities available to create a modern Outback that values its nature and sustains its people.
