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Prismopora
Classification
Phylum:
Bryozoa
Subphylum:
Ectoprocta
Class:
Gymnolaemata
Order:
Cystoporata
Suborder:
Fistuliporina
Family:
Hexagonellidae
Formal Genus Name and Reference:
Prismopora HALL, 1883b, p. 158
Type Species:
P. triquetra, SD Hall & SIMPSON, 1887, p. xxi, M. Dev., Falls of the Ohio, Jeffersonville, Ind., USA
Images
(Click to enlarge in a new window)
Fig. 203, la-g. *P. triquetra, a, autozooecia isolated by stereom, lunaria on proximal side of autozooecia near branch center, on lateral sides of autozooecia near branch margins, tang. sec., topotype, USNM 159839, x30, b, bifurcating trifoliate branches, cotype, WM 13985:f.10, x1, c, undulatory mesotheca, autozooecia and vesicles in endozone, stereom in exozone, long. sec., topotype, USNM 159839, x20, d, granular central layer in mesothecae, trifoliate zoarium, stereom in exozone, transv. sec., topotype, USNM 159841, x30, e. two mesothecae flank tangential view of concave branch face; disral hemisepra in longitudinal view of aurozooecia (lefr); rang. and long. sec., roporype, USNM 159839, X30;! recumbent aurozooecia and vesicles in endozone, disral hemisepta (left); long. sec., topotype, USNM 159840, X20; g, peristomes and lunaria, solid branch margin (right); cotype, WM 13985, X10.
Synonyms
Geographic Distribution
Dev.-Perm., N.Am., Australia
Age Range
Beginning Stage in Treatise Usage:
Dev.
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Zoarium trifoliate, irregularly branching, Branches narrow, parallel-sided, faces concave, margins solid, noncelluliferous, Monticules lacking, Autozooecia with peristomes and lunaria, lunaria on proximal side of autozooecia in row in center of branch, rotated to progressively more lateral position in rows of autozooecia toward branch margin, Mesotheca with central layer granular, outer layers granular-prismatic, Autozooecia partially isolated at mesotheca by vesicular tissue, clavate at contact with mesotheca, expanding distally, with recurved distal hemiseptum near zooecial bend, subcircular in cross section in exozone, Wall granular-prismatic, tubuli in outer granular-prismatic layer, Lunaria in exozone, radius of curvature short, ends may inflect slightly, microstructure granular-prismatic, Vesicular tissue forming small, low blisters in endozone and inner exozone, granular-prismatic, stereom in most of exozone, with acanthostyles.
References
Hall, James, ,, ,, , 1883b, Bryozoans of the Upper Helderberg and Hamilton groups: Trans. Albany Inst., v. 10, p. 145-197.
Museum or Author Information
Classification
Phylum:
Bryozoa
Subphylum:
Ectoprocta
Class:
Gymnolaemata
Order:
Cystoporata
Suborder:
Fistuliporina
Family:
Hexagonellidae
Formal Genus Name and Reference:
Prismopora HALL, 1883b, p. 158
Type Species:
P. triquetra, SD Hall & SIMPSON, 1887, p. xxi, M. Dev., Falls of the Ohio, Jeffersonville, Ind., USA
Images
(Click to enlarge in a new window)
Fig. 203, la-g. *P. triquetra, a, autozooecia isolated by stereom, lunaria on proximal side of autozooecia near branch center, on lateral sides of autozooecia near branch margins, tang. sec., topotype, USNM 159839, x30, b, bifurcating trifoliate branches, cotype, WM 13985:f.10, x1, c, undulatory mesotheca, autozooecia and vesicles in endozone, stereom in exozone, long. sec., topotype, USNM 159839, x20, d, granular central layer in mesothecae, trifoliate zoarium, stereom in exozone, transv. sec., topotype, USNM 159841, x30, e. two mesothecae flank tangential view of concave branch face; disral hemisepra in longitudinal view of aurozooecia (lefr); rang. and long. sec., roporype, USNM 159839, X30;! recumbent aurozooecia and vesicles in endozone, disral hemisepta (left); long. sec., topotype, USNM 159840, X20; g, peristomes and lunaria, solid branch margin (right); cotype, WM 13985, X10.
Synonyms
Geographic Distribution
Dev.-Perm., N.Am., Australia
Age Range
Beginning Stage in Treatise Usage:
Dev.
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Zoarium trifoliate, irregularly branching, Branches narrow, parallel-sided, faces concave, margins solid, noncelluliferous, Monticules lacking, Autozooecia with peristomes and lunaria, lunaria on proximal side of autozooecia in row in center of branch, rotated to progressively more lateral position in rows of autozooecia toward branch margin, Mesotheca with central layer granular, outer layers granular-prismatic, Autozooecia partially isolated at mesotheca by vesicular tissue, clavate at contact with mesotheca, expanding distally, with recurved distal hemiseptum near zooecial bend, subcircular in cross section in exozone, Wall granular-prismatic, tubuli in outer granular-prismatic layer, Lunaria in exozone, radius of curvature short, ends may inflect slightly, microstructure granular-prismatic, Vesicular tissue forming small, low blisters in endozone and inner exozone, granular-prismatic, stereom in most of exozone, with acanthostyles.
References
Hall, James, ,, ,, , 1883b, Bryozoans of the Upper Helderberg and Hamilton groups: Trans. Albany Inst., v. 10, p. 145-197.