The tube-dwelling polychaete Pseudopotamilla reniformis (Sabellidae) forms dense and complex aggregations of flexible tubes on hard substrates in the subtidal zone of the White Sea. No sexual reproduction was observed in this study and... more
The tube-dwelling polychaete Pseudopotamilla reniformis (Sabellidae) forms dense and complex aggregations of flexible tubes on hard substrates in the subtidal zone of the White Sea. No sexual reproduction was observed in this study and recruitment appeared to be due to asexual reproduction by architomy in winter, from October to March. The posterior part of the abdomen undergoes spontaneous fission into from 2 to 4 fragments and depending on their position, the fragments regenerate their anterior ends or both anterior and posterior ends. Regeneration in P. reniformis takes place via a combination of epimorphosis (replacement of missing parts by cell proliferation and the growth of new tissue) and morphallaxis (the remodelling of pre-existing structures without cell proliferation). The morphogenetic events during regenerative restoration include de novo formation of branchial crown, formation of thoracic segments and restoration of the posterior end. Asexual reproduction appears to p...
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A well-illustrated glossary supports the study of polychaete anatomy and systematics, as well as aiding species identification, a need that emerged within the shipping and aquaculture industries over recent decades. Sabellidae, Serpulidae... more
A well-illustrated glossary supports the study of polychaete anatomy and systematics, as well as aiding species identification, a need that emerged within the shipping and aquaculture industries over recent decades. Sabellidae, Serpulidae and Spionidae are polychaete families that most often include species that are translocated globally through ship fouling, ballast water or aquaculture trade. Accurate identifications are crucial since these translocations have significant ecological and commercial implications and also for phylogenetic and other biological studies. Using digital illustrations of specimens (deposited predominantly at the Australian Museum in Sydney), a glossary has been developed for these three families with the aim of standardising terminologies. Complete-focus images were generated with Helicon Focus 5.3 Pro software from multiple image layers. The definitions have been explained specific to families and illustrated with these images, thus creating the first com...
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Largemouth bass nesting disturbance significantly affected the distribution and abundance of macroinvertebrates in the littoral zone of Lake Wedington, AR. The total average densities and richness of benthic invertebrates were... more
Largemouth bass nesting disturbance significantly affected the distribution and abundance of macroinvertebrates in the littoral zone of Lake Wedington, AR. The total average densities and richness of benthic invertebrates were significantly greater outside than inside the nest areas throughout the reproductive period. Chironomidae, Oligochaeta, and Ephemeroptera dominated the samples, and densities of these invertebrates were consistently greater outside nests throughout this period. However, these alterations were transient and the recovery from the disturbance was observed within ten days following completion of largemouth bass nesting. The frequency and predictability of nesting disturbance and nature of disturbed substrate seem to be the factors affecting the persistence of the disturbance effects.
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A well-illustrated glossary supports the study of polychaete anatomy and systematics, as well as aiding species identification, a need that emerged within the shipping and aquaculture industries over recent decades. Sabellidae, Serpulidae... more
A well-illustrated glossary supports the study of polychaete anatomy and systematics, as well as aiding species identification, a need that emerged within the shipping and aquaculture industries over recent decades. Sabellidae, Serpulidae and Spionidae are polychaete families that most often include species that are translocated globally through ship fouling, ballast water or aquaculture trade. Accurate identifications are crucial since these translocations have significant ecological and commercial implications and also for phylogenetic and other biological studies. Using digital illustrations of specimens (deposited predominantly at the Australian Museum in Sydney), a glossary has been developed for these three families with the aim of standardising terminologies. Complete-focus images were generated with Helicon Focus 5.3 Pro software from multiple image layers. The definitions have been explained specific to families and illustrated with these images, thus creating the first com...
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Members of the tubicolous polychaete family Serpulidae constitute one of the most important groups of marine fouling biota. This paper describes a new species of the serpulid genus Hydroides from dock fouling at Mazatlán (southern Gulf of... more
Members of the tubicolous polychaete family Serpulidae constitute one of the most important groups of marine fouling biota. This paper describes a new species of the serpulid genus Hydroides from dock fouling at Mazatlán (southern Gulf of California), providing information about live colouration and reproductive features. Hydroides dolabrus sp. nov. belongs to a subgroup of species in which verticil spines are equal in size and shape, lack both external and lateral spinules, but have various modifications to their tips. However, Hydroides dolabrus sp. nov. is distinct in having tips of verticil spines pickaxe-shaped, with asymmetrical triangular radially orientated projections: the internal projections are short and point inward the verticil centre, while longer external projections point outward the verticil centre. Like all species of the genus, H. dolabrus sp. nov. is a gonochoristic broadcast spawner lacking sexual dimorphism. A phylogenetic analysis of Hydroides based on COI, 18S and cyt b sequence data reveals that H. dolabrus sp. nov. is genetically distinct from other species of Hydroides for which sequence data are available. The new species is the 11th in the genus described from Mexican waters.