 |
 |
 |
| Graptolite Net | Graptolites & Graptoliters | Relationships of Graptolites | Rhabdopleuroidea | Cephalodiscoidea |
| Edited by Piotr Mierzejewski, the Count of Calmont and Countess Maja A. Korwin-Kossakowska 2002-2004 |
| Family Rhabdopleuroididae Mierzejewski, 1986 Type genus: Rhabdopleuroides Koz這wski, 1961 |
| Diagnosis. - Coenecium exclusively composed of creeping stolonal and zooidal tubes and stolons without cysts of sterile buds. Remarks. - Monotypic family. |
| Genus Rhabdopleuroides Koz這wski, 1961 Type species: Rhabdopleuroides expectatus Koz這wski 1961 Diagnosis: As for family. Occurence. Ordovician of Poland Rhabdopleuroides expectatus Koz這wski, 1961 1961. Rhabdopleuroides expactatus Koz這wski; Koz這wski: 4, figs. 1-3. 1970a. Rhabdopleuroides expectatus Koz這wski; Koz這wski: 5, pl. 1: 1-2. Diagnosis. - See Koz這wski (1961: 4-5). Material. - About a dozen decoloured and strongly crushed fragments of coenecium from erratic boulders ZPAL 0.22, ZPAL 0.25, ZPAL O.42, ZPAL O.60, ZPAL O. 90 and ZPAL O.169 as well as the borehole Mielnik (depth 1118-1124 m). Remarks. - No additional material was found and some of the specimens gathered by Koz這wski became crushed or evenly completely destroyed as a result of intense decouloring. The holotype of Rhabdopleuroides expectatus has become dissolved in glycerine in which it had been kept and in this way Kozlowski (1970a) designated the neotype. However, this designation appears invalid in the light of the principles of zoological nomenclature. According to Artcle No. 75 of the International Code of Zoological Nomeclature, a neotype may be designated only when a type series has been destroyed or lost and providing that certain formal requirements are met. In the present case all the specimens of type series except for the holotype were available. Therefore only one of them could be chosen as neotype. However, Koz這wski (1970a) designated a specimen coming from a new locality (Mielnik borehole). For this reason I designate as a lectotype a specimen coming from the type seris, described, figured and designated as paratype by Koz這wski (1970a: fig.2). Occurence. - Ordovician of Poland. Source: Mierzejewski, P. 1986. Ultrastructure, taxonomy and affinities of some Ordovician and Silurian organic microfossils. - Palaeontologia Polonica 47, 129-220. |
| Rhabdopleura - like fossil pterobranchs |
 |
| Rhabdopleuroides expectatus from Mielnik 1 borehole (Poland, Middle Ordovician) Fragment of tubarium composed of one stolonal tube with stolon and four lateral tubes. Abbreviations: m - membrane, s - stolon, 1-4 - lateral tubes. From Koz這wski (1970) |
 |
 |
| Lectotype of Rhabdopleuroides expectatus Ordovician boulder No. O.90, Rewal. Abbreviations: m - membrane, ts- stolonal tube, tz - zooidal tube. From Koz這wski (1970) |
| For related pages see HERE. |