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Dybowskiella
Classification
Phylum:
Bryozoa
Subphylum:
Ectoprocta
Class:
Gymnolaemata
Order:
Cystoporata
Suborder:
Fistuliporina
Family:
Fistuliporidae
Formal Genus Name and Reference:
Dybowskiella Waagen & WENTZEL, 1886, p. 916
Type Species:
Dybowskiella grandis, OD
Images
(Click to enlarge in a new window)
Fig. 180, 2a-d. *D. grandis, "?Carb., " USNM 61314, a, thin-walled autozooecia with inflecting ends of lunaria, isolated by small polygonal vesicles in inner exozone, tang. sec., x30, 6, thick-walled autozooecia with lunaria, dark acanthostyles in some vesicle roofs (above center), tang. sec., x30, c, dark granular central zone in lunarium (below) not continuous into dark granular autozooecial boundary, thick, light-colored, granular-prismatic layers in autozooecial wall and lunarium, tang. sec., x100, d, diaphragms in autozooecia in endozone and exozone (left) (above), autozooecia budded on vesicular tissue (below) in endozone and exozone, polygonal to boxlike vesicles isolate autozooecia, vesicles decrease in height in outer exozone, long. sec., x20.
Synonyms
Triphyllotrypa
Geographic Distribution
Perm., Asia, N.Am., Australia
Age Range
Beginning Stage in Treatise Usage:
Perm., Asia, N.Am., Australia
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Perm., Asia, N.Am., Australia
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Zoatium ramose, hollow ramose, encrusting, hemispherical, or massive. Monticules elevated or flush, central cluster of small polygonal vesicles surrounded by larger zooecia with lunaria partly to completely radial in arrangement. Autozooecia full width, hemispherical in cross section at basal layer or where budded on vesicular tissue. Basal layer with dark, granular, primary layer and thick, light-colored, granular-prismatic layer. Autozooecia subcircular in cross section in endozone and exozone; isolated by many small polygonal vesicles; wall with granular boundary zone and light-colored granular-prismatic cortex. Diaphragms straight, curved, oblique, or incomplete. Lunaria in endozone and exozone, ends inflecting autozooecial cavity; dark granular zone not continuous with dark boundary zone in wall; thick distal and proximal granular-prismatic zones. Vesicular tissue in endozone and exozone; isolating autozooecia; vesicles subrectangular with straight superimposed or zigzag walls and flat to slightly curved roofs at same level in adjacent vesicles; small and polygonal in cross section. Roofs thickening into stereom at zoarial surface in some species. Small acanthostyles or tubuli in some vesicle roofs or stereom (a few appear to be central " pores" ). Vesicles granular-prismatic. [Triphyllotrypa speciosa MOORE & DUDLEY, 1944, p. 291, is the type species of Triphyllotrypa MOORE & DUDLEY, 1944, by original designation. Like other species assigned to Triphyllotrypa, it differs from Dybowskiella grandis WAAGEN & WENTZEL, mainly in growth habit: encrusting, hemispherical, or massive in T. speciosa and ramose or hollow ramose in D. grandis. In addition, species assigned to Triphyllotrypa may have a thick prolongation on the proximal side of lunaria in monticular zooids, and little or no development of stereom. These differences are judged to be too minor for generic separation, and Triphyllotrypa is considered to be a synonym of Dybowskiella.}
References
Waagen, W. H., & Pichl, J., , & Wentzel, Joseph, 1886, Salt Range fossils; Productus-limestone fossils: Mem. Geol. Surv. India (Palaeontol. Indica), ser. 13, v. 1, pt. 6, p. 835-924, pl. 97-116.
Museum or Author Information
Classification
Phylum:
Bryozoa
Subphylum:
Ectoprocta
Class:
Gymnolaemata
Order:
Cystoporata
Suborder:
Fistuliporina
Family:
Fistuliporidae
Formal Genus Name and Reference:
Dybowskiella Waagen & WENTZEL, 1886, p. 916
Type Species:
Dybowskiella grandis, OD
Images
(Click to enlarge in a new window)
Fig. 180, 2a-d. *D. grandis, "?Carb., " USNM 61314, a, thin-walled autozooecia with inflecting ends of lunaria, isolated by small polygonal vesicles in inner exozone, tang. sec., x30, 6, thick-walled autozooecia with lunaria, dark acanthostyles in some vesicle roofs (above center), tang. sec., x30, c, dark granular central zone in lunarium (below) not continuous into dark granular autozooecial boundary, thick, light-colored, granular-prismatic layers in autozooecial wall and lunarium, tang. sec., x100, d, diaphragms in autozooecia in endozone and exozone (left) (above), autozooecia budded on vesicular tissue (below) in endozone and exozone, polygonal to boxlike vesicles isolate autozooecia, vesicles decrease in height in outer exozone, long. sec., x20.
Synonyms
Triphyllotrypa
Geographic Distribution
Perm., Asia, N.Am., Australia
Age Range
Beginning Stage in Treatise Usage:
Perm., Asia, N.Am., Australia
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Perm., Asia, N.Am., Australia
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Zoatium ramose, hollow ramose, encrusting, hemispherical, or massive. Monticules elevated or flush, central cluster of small polygonal vesicles surrounded by larger zooecia with lunaria partly to completely radial in arrangement. Autozooecia full width, hemispherical in cross section at basal layer or where budded on vesicular tissue. Basal layer with dark, granular, primary layer and thick, light-colored, granular-prismatic layer. Autozooecia subcircular in cross section in endozone and exozone; isolated by many small polygonal vesicles; wall with granular boundary zone and light-colored granular-prismatic cortex. Diaphragms straight, curved, oblique, or incomplete. Lunaria in endozone and exozone, ends inflecting autozooecial cavity; dark granular zone not continuous with dark boundary zone in wall; thick distal and proximal granular-prismatic zones. Vesicular tissue in endozone and exozone; isolating autozooecia; vesicles subrectangular with straight superimposed or zigzag walls and flat to slightly curved roofs at same level in adjacent vesicles; small and polygonal in cross section. Roofs thickening into stereom at zoarial surface in some species. Small acanthostyles or tubuli in some vesicle roofs or stereom (a few appear to be central " pores" ). Vesicles granular-prismatic. [Triphyllotrypa speciosa MOORE & DUDLEY, 1944, p. 291, is the type species of Triphyllotrypa MOORE & DUDLEY, 1944, by original designation. Like other species assigned to Triphyllotrypa, it differs from Dybowskiella grandis WAAGEN & WENTZEL, mainly in growth habit: encrusting, hemispherical, or massive in T. speciosa and ramose or hollow ramose in D. grandis. In addition, species assigned to Triphyllotrypa may have a thick prolongation on the proximal side of lunaria in monticular zooids, and little or no development of stereom. These differences are judged to be too minor for generic separation, and Triphyllotrypa is considered to be a synonym of Dybowskiella.}
References
Waagen, W. H., & Pichl, J., , & Wentzel, Joseph, 1886, Salt Range fossils; Productus-limestone fossils: Mem. Geol. Surv. India (Palaeontol. Indica), ser. 13, v. 1, pt. 6, p. 835-924, pl. 97-116.