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Xenacoelomorpha is the sister group to Nephrozoa
The position of Xenacoelomorpha in the tree of life remains a major unresolved question in the study of deep animal relationships. Xenacoelomorpha, comprising Acoela, Nemertodermatida, and
Evolution and development of the adelphophagic, intracapsular Schmidt’s larva of the nemertean Lineus ruber
TLDR
The evolution of the intracapsular Schmidt’s larva involved the loss of the typical feeding structures of the planktotrophic pilidium and a precocious formation of the imaginal discs, as also observed in other pelagic lecithotrophic forms.
Clustered brachiopod Hox genes are not expressed collinearly and are associated with lophotrochozoan novelties
TLDR
The shared and specific expression of Hox genes, together with Arx, Zic, and Notch pathway components in chaetae and shell fields in brachiopods, mollusks, and annelids provide molecular evidence supporting the conservation of the molecular basis for these lophotrochozoan hallmarks.
Expression of segment polarity genes in brachiopods supports a non-segmental ancestral role of engrailed for bilaterians
TLDR
Findings suggest that bilaterians might share an ancestral, non-segmental domain of engrailed expression during early embryogenesis, and suggest the role of “segmentation genes” in organisms that lack a segmented body.
Embryonic chirality and the evolution of spiralian left–right asymmetries
TLDR
The findings indicate that early embryonic chirality is widespread and independent of the cleavage programme in the Spiralia, and illuminates the evolution of nodal and Pitx signalling by demonstrating embryonic asymmetric expression in lineages without obvious adult left–right asymmetries.
Embryonic, Larval, and Juvenile Development of the Sea Biscuit Clypeaster subdepressus (Echinodermata: Clypeasteroida)
TLDR
Track the morphogenesis of early juveniles is a necessary step to elucidate the developmental mechanisms of echinoid growth and important groundwork to clarify homologies between irregular urchins.
Kinetics of induced wound repair at 0°C in the Antarctic fish (Cabeçuda) Notothenia coriiceps
TLDR
Notothenia coriiceps shows for the first time the kinetics of wound repair at 0°C and the regenerating epidermis migration speed was 33.3–43.4 μm/day.
Cleavage modification did not alter blastomere fates during bryozoan evolution
TLDR
The work suggests that bryozoans have retained traits of spiral development, such as the early embryonic fate map, despite the evolution of a novel cleavage geometry, providing additional support that stereotypic cleavage patterns can be modified during evolution without major changes to the molecular identity and fate of embryonic blastomeres.
Microscopical study of experimental wound healing in Notothenia coriiceps (Cabeçuda) at 0°C
TLDR
This is the first report of successful wound repair at polar temperatures, indicating the adaptation of N. coriiceps to the Antarctic environment and suggests that different mechanisms in wound repair occur at 0°C from those in fish from temperate and tropical environment.
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