Diplohydra szaniawskii, Mierzejewski & Kulicki, 2002
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publication ID |
https://doi.org/ 10.48550/arxiv.cond-mat/0207031 |
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persistent identifier |
https://treatment.plazi.org/id/031F87DF-4939-A076-5458-7CFA1754F83D |
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treatment provided by |
Felipe |
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scientific name |
Diplohydra szaniawskii |
| status |
sp. nov. |
Diplohydra szaniawskii sp. nov.
Figs. 2 View Fig , 3 View Fig .
Holotype: The specimen figured in Fig. 2A View Fig 1–A View Fig 4 ( ZPAL Pb/0/1).
Type locality and type stratum: The boring Dia 84− 31 in Svalis Dome ( central Barents Sea , Norway), depth 10.18–10.40 m, Kazanian (uppermost Permian) .
Derivation of the name: Named in honour of the discoverer, Professor Hubert Szaniawski.
Diagnosis.—A species with the stolon system composed of stolons and their broad and long subcylindrical or slightly irregular swellings. The swellings as imperfect dormant bud cysts closed or ending with terminal stolons. Fusellar zooidal tubes minute, distinctly narrower than stolons and their swellings.
Material.— Three specimens ( ZPAL Pb.0/1−3), all etched from matrix .
Description.—General form of the colony unknown, but presumably linear. The holotype is an irregularly curved bundle of stolons 3.41 mm long, connected with two fusellar zooidal tubes ( Fig. 2A View Fig 1 View Fig ). Stolons, having a thickness of about 65–115 µm, are provided with large (600–750 µm long and 210–250 µm wide) subcylindrical or slightly irregular cyst−like swellings. Cyst−like swellings may be interpreted as imperfect conventional and composite cysts of dormant buds. Two fusellar tubes 135–145 µm long and ca. 90 µm wide, grow out at a high angle from the stolon proper (tube z 1) and the cyst−like swelling of the stolon (tube z 2). Fusellar tubes show no trace of apertural or thecal modification such as widenings or apertural processes that would indicate their true nature. Fusellar growth increments are hardly visible and are spaced at about 58 per mm. The other specimen lacks fusellar tubes and is composed of branched stolons with cyst−like swellings ( Fig. 2B View Fig ).
Remarks.—Despite incomplete preservation, the holotype and the second specimen are sufficiently large fragments of coenecia for revealing diagnostic characteristics. However, more information may be provided if more and better preserved material becomes available. Its general features correspond well to those of other species assigned to the genus. The species here described shows a particularly striking similarity to D. gonothecata but differs in its remarkably greater dimmensions. So far, D. szaniawski sp. nov. is the only known species of Diplohydra found with remnants of fusellar elements. However, the nature of the fusellar tubes is not clearly understood, and whether they represent stolonal tubes, or zooidal tubes is a problem that is difficult to solve. It should be kept in mind that the fusellar tubes of the Rhabdopleuroidea are fairly undiagnostic (see Mierzejewski 1986), although the form un− der consideration is a single rhabdopleurid species provided with these elements narrower than nonfusellar tubes.
Occurrence.—Upper Permian (Kazanian), Norway (Barents Shelf).
| ZPAL |
Zoological Institute of Paleobiology, Polish Academy of Sciences |
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