Richard S. Boardman's research while affiliated with Smithsonian Institution and other places
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Publications (5)
Reconsideration of the nature of zooids in trepostomate Bryozoa defines them as physically connected and asexually replicated colony members that housed systems of organs necessary to perform vital functions for the colonies. Zooids known to contain organs in trepostomes are limited to autozooids, the requisite feeding and sexual units, and polymor...
In many species of lower Paleozoic trepostomes (Bryozoa; class Stenolaemata) transverse partitions called skeletal diaphragms differentiated feeding from non-feeding regions of colonies. It has been thought that each diaphragm floored the living chamber of a feeding polypide. However, analysis of skeletal growth patterns has shown that many diaphra...
In many species of lower Paleozoic trepostomes (Bryozoa; class Stenolaemata) transverse partitions called skeletal diaphragms differentiated feeding from non-feeding regions of colonies. It has been thought that each diaphragm floored the living chamber of a feeding polypide. However, analysis of skeletal growth patterns has shown that many diaphra...
Delicate symmetrical structures in living chambers of autozooecia of some lower Paleozoic species of the order Trepostomata have been interpreted as indications of polypides with little further elaboration. Applications of the anatomy, mode of skeletal growth, and functional requirements basic to living species permit recognition of a few organs of...
Citations
... Study of this fossil assemblage thus gives us early examples of cavedwelling bryozoans that are elsewhere known from the Jurassic (Palmer and Fürsich, 1974;Wilson, 1998), Neogene (Rosso et al., 2015), and Recent (Harmelin, 1986(Harmelin, , 1997(Harmelin, , 2000Rosso et al., 2013). New information is gained about bioerosion during the Ordovician Bioerosion Revolution (Wilson and Palmer, 2006;Buatois et al., 2016), preservation by bioclaustration (Taylor, 1990) within bryozoan skeletons, and the distribution of preserved bryozoan polypides called "brown bodies" (Boardman, 1999). (Patzkowsky and Holland, 1996). ...
... Bryozoans described in this paper reveal various types of structures that can be summarized as "stylets" (Blake 1983a: 537). These structures have a generally rod-like or spine-like appearance and have been discussed in many earlier publications (e.g., Tavener-Smith 1969a; Tavener-Smith 1969b; Armstrong 1970; Blake 1873a; Blake 1873b; Boardman & Buttler 2005). The following types of stylets are observed in the Pennsylvanian bryozoans from the Sandia Mountains: acanthostyles, aktinotostyles, microstyles, nodes, and mural spines. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/933809797226499-1599649013878_Q64/Caroline-Buttler.jpg)
... Styles are supposed to be a defense against predators. The third group comprises lateral or shelf-like skeletal partitions into zooecia chambers: dia-, cysti-and hemiphragms (Fig. 5B, E) (Boardman 1983(Boardman , 2001Ernst 2020). Their function may be related to the sectioning of the autozooecial chambers, or they could possibly be attachment structures of retractor muscles, or a protection for the polypide. ...
... One of the most remarkable characters of Suecipora are long tubes that resemble peristomes of cyclostomes. The term "peristome" cannot be used here, because it concerns the tubes arising from the calcified frontal exterior walls in fixed-walled cyclostomes (e.g., Borg, 1926;Boardman, 1971Boardman, , 1998. Suecipora does not have any signs of frontal exterior walls, this is a typical free-walled bryozoan. ...
