Phacelostylophyllum mg. arbustulum, 1972
publication ID |
https://doi.org/ 10.5252/geodiversitas2021v43a22 |
publication LSID |
urn:lsid:zoobank.org:pub:6D1643AD-66A5-4678-9397-CE08E610D641 |
persistent identifier |
https://treatment.plazi.org/id/329A0F5D-31AE-41EA-9475-2E4641789CDE |
taxon LSID |
lsid:zoobank.org:act:329A0F5D-31AE-41EA-9475-2E4641789CDE |
treatment provided by |
Felipe |
scientific name |
Phacelostylophyllum mg. arbustulum |
status |
sp. nov. |
Phacelostylophyllum mg. arbustulum View in CoL n. sp.
( Fig. 49 View FIG )
urn:lsid:zoobank.org:act:329A0F5D-31AE-41EA-9475-2E4641789CDE
Phacelostylophyllum sp. 2 – Vasseur 2018: 289-290, fig. 3.75.
TYPE MATERIAL. — Holotype:CPUNPFPyr13; paratype:CPUNPFPyr9. S TUDIED SAMPLES. — Two specimens: CPUN PFPyr9, PFPyr13. ETYMOLOGY. — Refers to the true bushing aspect of this very developed phaceloid form. TYPE HORIZON. — Pliensbachian . TYPE LOCALITY. — Estivère pass and surrounding areas (Pyrenees, France). GEOGRAPHIC AND STRATIGRAPHIC RANGES. — Pliensbachian of the Estivère pass and surrounding areas ( Pyrenees , France) .
DESCRIPTION
Phaceloid colony with cylindrical corallites multiplying by extratentacular lateral budding.Radial elements are subcompact, free, straight or wavy septa, organized in 2 distinct size orders. Microstructure typically stylophyllid: septa are made of septal spines linked together by thickening deposits and generally dissociated at the distal and inner edges. Septa show a rhopaloid aspect in transverse section when a septal spine occur in its very inner part. The dissociation of the septal spines along the inner edge sometimes produces a papillose columella.Endotheca made of tabular and vesicular dissepiments. Wall present, apparently parathecal. An epitheca s.l. seems to wrap the corallites.
Calicular diameter: 3 to 7 mm – Number of septa: 28 to 45 – Septal density: 4 to 5 for 2 mm.
SIMILARITIES AND DIFFERENCES
Differs from Phacelostylophyllum martini (Fromentel, 1860) by the reduced size of the calices and the mode of budding.The new species has dimensions overlapping with P.irregularis (Duncan, 1867) . However the Hettangian species of Duncan has a very weak colonial development and a different mode of budding. From other species of the genus, P.arbustulum n. sp. is distinctive by its bushlike shape and by low values of diameter for such a number of septa (30-45). Phacelostylophyllum romerloana ( Volz, 1896) and P. pygmaeum ( Frech, 1890) have much less septa.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Phacelostylophyllum mg. arbustulum
Vasseur, Raphaël & Lathuilière, Bernard 2021 |
Phacelostylophyllum sp. 2
VASSEUR R. 2018: 289 |