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First molecular evidence for the existence of a Tardigrada + Arthropoda clade.
TLDR
The results obtained represent the first molecular evidence for a Tardigrada + Arthropoda clade and indicate the need to review those obtained solely on morphological characters.
A Review of Arthropod Phylogeny: New Data Based on Ribosomal DNA Sequences and Direct Character Optimization
TLDR
The high level of sequence heterogeneity in the 18S rRNA gene makes placement of certain taxa with “unusual” sequences difficult and underscores the necessity of combining ribosomal gene data with other sources of information.
A phylogenetic analysis of myosin heavy chain type II sequences corroborates that Acoela and Nemertodermatida are basal bilaterians
TLDR
This study demonstrates that Platyhelminthes are polyphyletic and that acoels and nemertodermatids are the extant earliest bilaterians, and that the common bilaterian ancestor was not, as currently held, large and complex but small, simple, and likely with direct development.
The position of arthropods in the animal kingdom: a search for a reliable outgroup for internal arthropod phylogeny.
TLDR
A cladistic approach to metazoan evolution including 133 18S rDNA sequences of 31 animal phyla is reported, suggesting that the Bilateria and Protostomia are monophyletic.
Growth and reproductive biology of Palaemon xiphias Risso, 1816 (Decapoda: Caridea: Palaemonidae)
ABSTRACT Aspects of growth and reproductive cycle of the prawn Palaemon xiphias were studied in Alfacs Bay (Ebro delta, Spain) from December 1989 to December 1990. Growth is continuous throughout the
Evidence that two types of 18S rDNA coexist in the genome of Dugesia (Schmidtea) mediterranea (Platyhelminthes, Turbellaria, Tricladida).
TLDR
The 1st case of 18S rDNA polymorphism within a metazoan species is reported and the need for analyzing a large number of clones whenever 18S sequences obtained by PCR amplification and cloning are being used in phylogenetic reconstruction is stressed.
Phylogeny of the arachnid order Opiliones (Arthropoda) inferred from a combined approach of complete 18S and partial 28S ribosomal DNA sequences and morphology.
TLDR
The phylogenetic relationships among the main evolutionary lines of the arachnid order Opiliones were investigated by means of molecular and morphological data sets and the most supported hypothesis suggests that Palpatores are paraphyletic.
Growth and reproductive ecology of Palaemon adspersus (Decapoda, Palaemonidae) in the western Mediterranean
TLDR
C Cohort analysis of the size-frequency distributions suggests the occurrence of a main recruitment period in the study area during August and September, and the estimated von Bertalanffy growth parameters suggest rapid growth for both sexes.
A new species of Loxosceles Heineken & Lowe, 1832 (Araneae: Sicariidae) from Iranian caves
TLDR
The phylogenetic relationship of the new species is discussed through the lens of molecular data ( cox1, rrnL and H3 genes), and the specimens showed morphological characteristics that allowed us to easily distinguish Loxosceles persica n.
Using community and population approaches to understand how contemporary and historical factors have shaped species distribution in river ecosystems
TLDR
Both community- and population-level approaches yielded information about the effects of historical factors on species distribution, however, the importance of historical events on current Trichoptera communities depends on the river zonation, indicating that both approaches should be employed together in biogeographical studies.
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