Evolution of Sexual Reproduction in Marine Invertebrates

Abstract

encouraged the study of bryozoans in every way possible. My zoological and pedagogical interests were formed to a great extent under the infl uence of his wonderful lectures, in the course of our long conversations and during the student fi eld practices that we conducted together. I have learnt much from him and continue to do so. I would also like to express my gratitude to Dr. A. F. Pushkin, Zoological Institute of the Russian Academy of Sciences, Saint Petersburg, who introduced me to the study of bryozoans. Thanks to him I took part in an Antarctic expedition and became experienced in biology as well as expedition life. Throughout my career I have felt the unfl agging support and benevolent interest of Prof.

New Cheilostomata (Bryozoa) from NE Atlantic seamounts, islands, and the continental slope: evidence for deep-sea endemism

“…The ooecium is also structurally different in that the ectooecium is membranous, and the endooecium fuses with the frontal shield of the distal auto-or kenozooid (Ostrovsky 2013). Both the relatively primitive structure of the ancestrula as well as the morphology of the ooecium in the new taxa may thus suggest that the new family forms a clade basal to the Romancheinidae sensu lato (further discussed below).…”

“…347: 1-51 (2017) Intergeneric differences also exist in ooecium formation. Considering that the evolutionarily most primitive state is an ooecium formed by the zooid distal to the maternal one (Ostrovsky 2013), the taxa display different stages of an evolutionary change toward reducing the contribution of the distal autozooid to ooecium formation. In Bathycyclopora gen. nov. the ooecium is produced via an areolar pore in the proximal frontal shield of the distal zooid.…”

Scientific Results of theHasslerExpedition. Bryozoa. No. 2. Brazil

“…Comparison of the Hassler Expedition bryozoan material from Brazil was made with museum specimens collected by University of São Paulo Professor Ernst Marcus and others, housed at the Museu de Zoologia da Universidade de São Paulo (MZUSP); the Natural History Museum, London (NHMUK) (to which Marcus donated some specimens from his Brazilian bryozoan work); and the National Museum of Natural History, Smithsonian Institution (NMNH) (for Canu and Bassler types and specimens from Brazil). The classification adopted here is based on Bock and Gordon (2013) and Ostrovsky (2013). Siphonoporella granulosa: Canu and Bassler, 1928a: 69, pl.…”

Redescription of some species of Bryozoa described by J. Jullien and L. Calvet in the NE Atlantic

“…Ovicells terminal, prominent, cleithral. Large ooecium formed by distal kenozooid with no visible frontal part (Ostrovsky et al 2009;Ostrovsky 2013). Ectooecium smooth, evenly perforated by small pseudopores prolongated in tubules, with small central umbo and sometimes growth lines.…”