Chaetal loss and replacement in Pseudopotamilla reniformis (Sabellida, Annelida)

Abstract

Invertebrate Biology 133(3): 261-273.

Getting to the root of fireworms' stinging chaetae—chaetal arrangement and ultrastructure of Eurythoe complanata (Pallas, 1766) (Amphinomida)

“…Here, the formative site is located at the dorsal edge of the neuropodial and at the ventral edge of the notopodial chaetal sac (Meyer & Bartolomaeus, ). Principally the same situation has been described from sabellidan species (Bartolomaeus, ; Kolbasova, Tzetlin, & Kupriyanova, ), terebellidan species (Bartolomaeus, ) and capitellid species (Schweigkofler, Bartolomaeus, & von Salvini‐Plawen, ). In arenicolid and maldanid species the formative site is located at the ventral edge of the neuropodial chaetal sac (Bartolomaeus & Meyer, ; Tilic, von Döhren, et al, 2015).…”

General morphology and ultrastructure of the radula of Testudinalia testudinalis (O. F. Müller, 1776) (Patellogastropoda, Gastropoda)

“…Two studied species of Caenogastropoda (Mischor & Märkel, ; Vortsepneva et al, ; see Table ) combine the apocrine and microvillar secretion during tooth formation. The tooth shape in T. testudinalis is not determined by microvilli as it was suggested for other gastropods (Runham, ; Wiesel & Peters, ), but by the localization of odontoblasts in the cushions. This is similar to the chaetae in Annelida, which are synthesized by special cells (chaetoblasts) due to microvillar secretion while the shape is determined by its surrounding cells (Bartholomaeus, ; Hausen, ; Kolbasova, Tzetlin, & Kupriyanova, ). We suggest that the final shape of the radular tooth is well‐defined by the folds of the surrounding epithelium (supraradular) and independent of the type of secretion.…”

Structure, function and cell dynamics during chaetogenesis of abdominal uncini in Sabellaria alveolata (Sabellariidae, Annelida)

“… - several several Hausen & Bartolomaeus 1998 [ 34 ] Prionospio fallax + + - - l + - - several several Hausen 2001 [ 35 ] Spirorbis spirorbis , abd - + + - s - - - - single Bartolomaeus 1995 [ 12 ] Sabellida Fabricia stellaris , tho + + + - l - - - several single Bartolomaeus 2002 [ 11 ] Fabricia stellaris , abd - + + - s - - - - single Bartolomaeus 2002 [ 11 ] Branchiomma bombyx , abd + + + - s - - - several single unpubl. data Pseudopotamilla reniformis, abd + + + - s - - - several single Kolbasova et al 2014 [ 13 ] Terebellida Pectinaria koreni - + + - s - ...…”

“…Uncini and hooked chaetae are discriminated by the length of the shaft, although its length is an imprecise character that varies intra- and supraspecifically [ 11 ]. Studies into the chaetogenesis of the hooked chaetae and uncini in certain sedentary polychaetes has revealed that the structure of these chaetae actually results from a uniform formation process (Sabellidae and Serpulidae [ 11 – 13 ]; Arenicolidae [ 14 , 15 ]; Maldanidae [ 10 ]; Psammodrilida [ 16 ], Terebellida [ 12 , 17 ]; Oweniidae [ 18 ]; Siboglinidae [ 19 ]). One of the major conclusions of these studies is that substructures and course of formation support the homology hypothesis for hooked chaetae and uncini, at least for the taxa studied [ 20 ].…”