Research Library | Digital Repository

Shell ultrastructure of the Atlantidae (Heteropoda, Mesogastropoda) Oxygyrus and Protatlanta, with comments on Atlanta inclinata. Bulletin of the AMNH ; v. 157, article 4

Show simple item record

dc.contributor.author Batten, Roger Lyman. en_US
dc.contributor.author Dumont, Michael P. en_US
dc.date.accessioned 2005-10-06T15:02:20Z
dc.date.available 2005-10-06T15:02:20Z
dc.date.issued 1976 en_US
dc.identifier.uri http://hdl.handle.net/2246/1205
dc.description p. 265-310 : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 309-310). en_US
dc.description.abstract "The purpose of the present study is to describe and interpret the wall ultrastructure of three atlantid heteropod species for phylogenetic and taxonomic analysis; they are Oxygyrus keraudreni, Protatlanta souleyeti, and Atlanta inclinata found in shallow waters of subtropic and tropic oceanic regions. Whereas most other members of predominantly thick-shelled, benthic mesogastropod families have three or more calcified crossed-lamellar layers termed here 'normal,' the exceedingly thin-walled planktonic atlantids have highly modified, crossed-lamellar layers termed here 'Type-2.' This 'Type-2' structure was perhaps derived from the normal mesogastropod type structure as a result of thinness of the wall, as this structure has been observed in unrelated thin-shelled taxa, such as pteropods (opisthobranchs), scissurellids (archaeogastropods), and early embryonic stages of fissurellids (archaeogastropods). An important variation is that both the first-order lamellae and the second-order rods may be rigid 'Type-2,' sigmoidal, or curved so that a layer may resemble helical structure. A new type of prismatic layer, asymmetric prismatic, is described and distinguished from simple prismatic, apertural prismatic, and myostracal structure. Variations of ultrastructure within samples of Oxygyrus keraudreni from the same population were found to have variant patterns identical with those of distant populations. Ornamented and unornamented embryonic Protatlanta souleyeti were found within populations in about the same ratio. The wall structure among Oxygyrus keraudreni, Protatlanta souleyeti, and Atlanta inclinata is distinct, with variations that can be used to distinguish each species. Embryonic variations of ultrastructure are characterized by changing thickness of wall structure during growth, whereas adult variations of ultrastructure are characterized by morphologic changes within a specific wall unit type. A study of heteropod material from plankton tows and bottom dredges failed to establish any recognizable difference in alteration of ultrastructure by selective solution in deep sea sediments. Both types of samples displayed about the same degree of alteration, implying that factors either biological or chemical are operating on individuals even during their life cycle"--P. 267. en_US
dc.format.extent 29957077 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York : American Museum of Natural History en_US
dc.relation.ispartofseries Bulletin of the American Museum of Natural History ; v. 157, article 4 en_US
dc.subject.lcc QH1 .A4 vol.157, art.4, 1976 en_US
dc.subject.lcsh Oxygyrus keraudreni. en_US
dc.subject.lcsh Protatlanta souleyeti. en_US
dc.subject.lcsh Atlanta inclinata. en_US
dc.subject.lcsh Mollusks -- Anatomy. en_US
dc.subject.lcsh Ultrastructure (Biology) en_US
dc.title Shell ultrastructure of the Atlantidae (Heteropoda, Mesogastropoda) Oxygyrus and Protatlanta, with comments on Atlanta inclinata. Bulletin of the AMNH ; v. 157, article 4 en_US
dc.title.alternative Atlantidae ultrastructure en_US
dc.type text en_US


Files in this item

This item appears in the following Collection(s)

  • Bulletin of the American Museum of Natural History
    The Bulletin, published continuously since 1881, consists of longer monographic volumes in the field of natural sciences relating to zoology, paleontology, and geology. Current numbers are published at irregular intervals. The Bulletin was originally a place to publish short papers, while longer works appeared in the Memoirs. However, in the 1920s, the Memoirs ceased and the Bulletin series began publishing longer papers. A new series, the Novitates , published short papers describing new forms.

Show simple item record

Search Entire Repository

Advanced Search

Browse

My Account