Phylogenetic analysis of the Sphaeriidae (Mollusca: Bivalvia) based on partial mitochondrial 16s rDNA gene sequences

We have constructed molecular phylogenetic trees for members of the Sphaeriidae in order to test proposed generic level relationships, and to reconstruct the evolutionary pattern of parental care, in this exclusively freshwater family of heterodont bivalves. An ∼480 nucleotide fragment of the mitochondrial large ribosomal subunit (16s rDNA) was sequenced for 4 corbiculid outgroups in addition to 19 sphaeriid ingroup taxa. Ingroup species were obtained from North and South America, Europe, and Australasia and included representatives of the main sphaeriid genera. Our analyses support four primary conclusions: 1) the Sphaeriinae are robustly monophyletic with respect to Eupera platensis ; 2) the genus Pisidium is paraphyletic and P. sterkianum is sister to the 17 other sphaeriine taxa in our dataset; 3) synchronous brooding is the ancestral reproductive pattern in the Sphaeriinae; 4) the sequential brooders form a clade in which Musculium taxa are monophyletic and nested among lineages of Sphueriunz. Our gene trees reveal an evolutionary progression in parental care complexity from the relatively simple pattern in the Euperinae, to the origin of brood sacs and of extraoogonial embryonic nutrition in the common ancestor of the Sphaeriinae, and ultimately to the development of sequential brooding in Sphaerium/Musculium taxa.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72942/1/j.1744-7410.2000.tb00016.x.pd

Morphological Characters Analysis, the Intergroup Phylogenetic Relationships and Possible Outgroups of the Family Sphaeriidae (Mollusca, Bivalvia)

Scenaria of the morphological characters transformations in freshwater molluscs traditionally included in the family Sphaeriidae are studied; they are based on the phylogenetic analysis of 69 characters in 57 taxa.Рассмотрены сценарии эволюционных преобразований морфологических признаков пресноводных моллюсков, традиционно включаемых в семейство Sphaeriidae, основанные на результатах филогенетического анализа 69 признаков в 57 таксонах

Non-Unionid Freshwater Bivalves (Sphaeriidae, Corbiculidae, Dreissenidae) of North American Fauna

The article concerns recent representatives of the North American freshwater bivalve mollusks from the three families: Sphaeriidae, Corbiculidae and Dreissenidae. Since only the first family contains aborigine North American species, the paper is focused on this group. The Corbiculidae are represented by a single species (Corbicula fluminea) and Dreissenidae by two species (Dreissena polymorpha and D. bugensis) introduced from Europe and Asia.Статья представляет собой обзор современных пресноводных двустворчатых моллюсков Северной Америки из семейств Sphaeriidae, Corbiculidae и Dreissenidae. Особое внимание уделяется сфериидам, так как к этому семейству относятся автохтонные североамериканские виды. Два других семейства представлены вселенцами из Европы и Азии — одним видом корбикулид (Corbicula fluminea) и двумя видами дрейссенид (Dreissena polymorpha и D. bugensis), и для них приведены только краткие характеристики

Evaluation of anatomical characters and their applicability for reconstructing phylogenetic relationships in the Palaearctic species of Pisidium s. l. (Mollusca, Bivalvia)

Anatomical study of the small clams traditionally included in the genus Pisidium revealed new taxonomically and phylo-genetically significant characters. Plesio- and apomorphic states are determined for these characters whenever possible. Synapomorphies in anatomical characters support some intrageneric groups established earlier and encourage to suggest the new affinities between species.Исследование анатомии мелких двустворчатых моллюсков, традиционно включаемых в род Pisidium, выявило новые таксономически и филогенетически значимые признаки. Определены плезиоморфные и апоийорфные состояния этих признаков. Синапоморфии по анатомическим признакам подтверждают монофилию некоторых внутриродовых группировок, установленных по конхологи-ческим признакам, и выявляют неизвестные ранее родственные связи между видами

On the Taxonomic Status of Pisidium uejii (Mollusca, Bivalvia)

Type specimens of Pisidium uejii Mori, 1938 from Japan, deposited in the collection of Senckenbergsmuseum, Frankfurt-am-Main, are studied and the species is shown to belong to the subgenus Odhneripisidium Kuiper. It is the second species of this subgenus known from Japan.Изучены типовые экземпляры Pisidium uejii Mori, 1938 из Японии, хранящиеся в Зснкенбергском музее (Франкфурт-на-Майне). Показана принадлежность вида к подроду Odhneripisidium Kuiper. Это второй вид подрода, обнаруженный в Японии