Ippolitov A.P.1, Rzhavsky A.V.2 2015. Tube morphology, ultrastructures and mineralogy in recent Spirorbinae (Annelida: Polychaeta: Serpulidae). II. Tribe Spirorbini // Invertebrate Zoology. Vol.12. No.1: 61–92 [in English].
1 Geological Institute of Russian Academy of Sciences (GIN RAS), 7 Pyzhevskiy per., Moscow, Russia, 119017, e-mail: email@example.com
2 A.N. Severtsov Institute of Ecology and Evolution of Russian Academy of Sciences (IPEE RAS), 33 Leninskiy prosp., Moscow, Russia, 119071, e-mail: firstname.lastname@example.org
ABSTRACT: This is the second paper of the series started with Ippolitov and Rzhavsky (2014) providing detailed descriptions of recent spirorbin tubes, their mineralogy and ultrastructures. Here we describe species of the tribe Spirorbini Chamberlin, 1919 that includes a single genus Spirorbis Daudin, 1800. Tube ultrastructures found in the tribe are represented by two types — irregularly oriented prismatic (IOP) structure forming the thick main layer of the tube and in some species spherulitic prismatic (SPHP) structure forming an outer layer and, sometimes, inner. Mineralogically tubes are either calcitic or predominantly aragonitic. Correlations of morphological, ultrastructural, and mineralogical characters are discussed. All studied members of Spirorbini can be organized into three groups that are defined by both tube characters and biogeographical patterns and thus, likely correspond to three phylogenetic clades within Spirorbini.
KEY WORDS: Tube ultrastructures, tube morphology, tube mineralogy, scanning electron microscopy, X-ray diffraction analysis, Spirorbinae, Spirorbini.