Phacelostylophyllum mg. arbustulum, 1972

Vasseur, Raphaël & Lathuilière, Bernard, 2021, Pliensbachian corals from the Western Tethys, Geodiversitas 43 (22), pp. 1187-1291 : 1258

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.

Kingdom

Animalia

Phylum

Cnidaria

Class

Anthozoa

Order

Scleractinia

Family

Stylophyllidae

Loc

Phacelostylophyllum mg. arbustulum

Vasseur, Raphaël & Lathuilière, Bernard 2021
2021
Loc

Phacelostylophyllum sp. 2

VASSEUR R. 2018: 289
2018
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