Figure 3 in Written in stone: history of serpulid polychaetes through time

Figure 3. Ultrastructural diversity of Recent serpulid tubes. A-E: isotropic structures: A – Serpula crenata Ehlers, 1908, inner tube layer, cross section of irregularly oriented prismatic structure (IOP), B – Pseudovermilia madracicola ten Hove, 1989, cross section of spherulitic irregularly oriented prismatic structure (SIOP) (after Vinn et al., 2008b: fig. 2A), C – Neovermilia falcigera (Roule, 1898), cross section of irregularly oriented platy structure (IOPL), D – Laminatubus alvini ten Hove et Zibrowius, 1986, cross section of homogeneous angular crystal structure (HAC), E – Pomatostegus stellatus (Abildgaard, 1789), cross section of homogeneous rounded crystal structure (HRC) (after Vinn et al., 2008b: fig. 3E), F, G: semi-oriented structures: F – Protula diomedeae Benedict, 1887, cross section of semi-ordered irregularly oriented prismatic structure (SOIOP) (after Vinn, 2007: fig. 5.5), G – Pyrgopolon ctenactis Mörch, 1863, outer tube layer, cross section of semi-ordered spherulitic irregularly oriented prismatic structure (SOSIOP) (after Vinn, 2007: fig. 7.4), H, I and M-O: oriented prismatic structures: H – Spiraserpula caribensis Pillai et ten Hove, 1994, outer tube layer, longitudinal section of spherulitic prismatic structure (SPHP) (after Vinn, 2007: fig. 6.5), I – Vitreotubus digeronimoi Zibrowius, 1979, longitudinal section of simple prismatic structure (SP) (after Vinn et al., 2008b: fig. 5B, enlarged), J-L: oriented complex structures: J – Hydroides dianthus Verrill, 1873, third layer from outside, longitudinal section of lamello-fibrillar structure (LF) (after Vinn, 2008: fig. 4.5), K – Floriprotis sabiuraensis Uchida, 1978, inner layer, cross section of spherulitic lamello-fibrillar structure (SLF), L – Spirobranchus giganteus (Pallas, 1766), outer layer, longitudinal section of ordered fibrillar structure (OF) (after Vinn et al., 2008b: fig. 6B), M-O – Ditrupa arietina (O. F. Müller, 1776), regularly ridged prismatic structure (RRP): M – tube external surface, etched with 1% acetic acid for 30 sec (after Vinn et al., 2008d: fig. 3F), N – external tube layer, longitudinal section, O – lateral surface of a RRP structure prism with ridges (after Vinn et al., 2008d: fig. 4A).图3 现生龙介虫栖管的超微结构多样性。A~E为各向同性结构： A — 具齿旋鳃虫（Serpula crenata Ehlers, 1908），管内层，不规则取向棱柱结构（irregularly oriented prismatic structure，IOP）的横截面； B — 马氏假蠕管虫（Pseudovermilia madracicola ten Hove, 1989），球粒状不规则取向棱柱结构（spherulitic irregularly oriented prismatic structure，SIOP）的横截面（引自Vinn等，2008b：图2A）； C — 镰状新蠕管虫（Neovermilia falcigera (Roule, 1898)），不规则取向板状结构（irregularly oriented platy structure，IOPL）的横截面； D — 阿尔文层管虫（Laminatubus alvini ten Hove et Zibrowius, 1986），均质角状晶体结构（homogeneous angular crystal structure，HAC）的横截面； E — 星状盖鳃虫（Pomatostegus stellatus (Abildgaard, 1789)），均质球状晶体结构（homogeneous rounded crystal structure，HRC）的横截面（引自Vinn等，2008b：图3E）； F、G为半取向结构： F — 迪奥米德旋鳃虫（Protula diomedeae Benedict, 1887），半有序不规则取向棱柱结构（semi-ordered irregularly oriented prismatic structure，SOIOP）的横截面（引自Vinn, 2007：图5.5）； G — 栉形棘管虫（Pyrgopolon ctenactis Mörch, 1863），管外层，半有序球粒状不规则取向棱柱结构（semi-ordered spherulitic irregularly oriented prismatic structure，SOSIOP）的横截面（引自Vinn, 2007：图7.4）； H、I及M~O为取向棱柱结构： H — 加勒比旋盖龙介虫（Spiraserpula caribensis Pillai et ten Hove, 1994），管外层，球粒状棱柱结构（spherulitic prismatic structure，SPHP）的纵切面（引自Vinn, 2007：图6.5）； I — 迪氏玻璃管虫（Vitreotubus digeronimoi Zibrowius, 1979），简单棱柱结构（simple prismatic structure，SP）的纵切面（引自Vinn等，2008b：图5B，放大图）； J~L为取向复合结构： J — 花状盘管虫（Hydroides dianthus Verrill, 1873），距外第三层，层状纤维结构（lamello-fibrillar structure，LF）的纵切面（引自Vinn, 2008：图4.5）； K — 佐伯花管虫（Floriprotis sabiuraensis Uchida, 1978），内层，球粒状层状纤维结构（spherulitic lamello-fibrillar structure，SLF）的横截面； L — 大旋鳃虫（Spirobranchus giganteus (Pallas, 1766)），外层，有序纤维结构（ordered fibrillar structure，OF）的纵切面（引自Vinn等，2008b：图6B）； M~O为戴胜蠕管虫（Ditrupa arietina (O. F. Müller, 1776)）的规则棱纹棱柱结构（regularly ridged prismatic structure，RRP）： M — 管外表面，经1%乙酸蚀刻30秒（引自Vinn等，2008d：图3F）； N — 管外层纵切面； O — 具棱纹的RRP结构棱柱的侧面（引自Vinn等，2008d：图4A）。