A new species of Websterinereis Pettibone, 1971, Websterinereis pettiboneae sp. n. is described from La Paz Bay, Gulf of California, Mexico. This species is similar to Websterinereis foli (Fauvel, 1930) in the neuropodial falcigers shape, but can be separated by the tentacular cirri length, notopodial prechaetal lobe shape, and the size of the notopodial dorsal and ventral ligules on posterior ...

Two new species of the cirratulid genus Tharyx are reported from shallow waters in the Kattegat inshore Sweden. In addition, the lectotype of Tharyx killariensis (Southern, 1914) is redescribed resulting in a revised concept of the noto- and neuropodial acicular spines of posterior parapodia for that species. These spines were originally reported as bidentate crotchets with sharply pointed teet...

Apostichopus japonicas is an economically important species with high nutritional value. However, our knowledge of its genetic diversity and the changes that occurred during domestication or trait selection quite limited. In this study, whole genomes 254 A . samples were resequenced. Analyses population structure revealed A. in north China generally high, there was no difference among six cultu...

Parapodial extensions of the foot are particularly well developed in Aplysia fasciata, in which species they function during swimming. As was indicated in earlier studies (Hughes & Tauc, 1962), many of the nerves which innervate the foot sensu stricto of other species supply the parapodia of Aplysia fasciata. In fact there is no detailed account of the branching of the nerves in A. fasciata; Ma...

A satellite-DNA family (RUSI) has been isolated and characterized in Rumexinduratus Boiss and Reuter (Polygonaceae), an Iberian endemic polygamous sorrel. The RUSI repeats are 170 bp in length and approximately 68% AT-rich containing different variants of degenerate telomere motifs--(TT)(n)AN(GG)(n) -, a typical feature of subtelomeric DNA repeats adjacent to telomeres, which have been referred...

The chemical composition of the essential oils of S. hierosolymitana Boiss. and S. multicaulis Vahl. var. simplicifolia Boiss. collected in Lebanon was studied by means of GC and GC-MS analysis. In all 115 compounds were identified: 82 for S hierosolymitana and 72 for S. multicaulis var. simplicifolia. The presence of carbonylic compounds (17%) characterizes the oil from S. hierosolymitana,whil...

We have studied the posterior Hox gene Nvi-Post1 expression in the early development of the polychaete Nereis virens. This is the first evidence of the posterior group Hox genes expression during the larval development of a Lophotrochozoan. The expression begins in the trochophore hyposphere at the prospective sites of larval parapodia. As the larva develops the expression weakens and finally b...