AnimaliaNot EvaluatedacceptedspeciesAccepted
Chainodictyon minor
Ulrich, 1890
GBIF:226325034
0year
ABOUT
Descriptions(4)
Description. Reticulate colonies formed by anastomosing branches. Branches frequently bifurcating, flattened, bearing 2 – 4 alternating rows of autozooecia; dorsal wall rugose, 0.30 – 0.79 mm wide. Fenestrules elongate, rounded-polygonal, 0.65 – 1.10 mm wide, and 1.26 – 1.90 mm long. Autozooecial apertures oval. Diaphragms not observed. Hemisepta absent. Styles absent. Leptozooecia common to abundant, small, occurring between autozooecia on the obverse side of branches. Autozooecial walls in endozone 0.013 – 0.020 mm thick, hyaline; finely laminated in exozone.
Ernst, Andrej, Claussen, Anna Lene, Seuss, Barbara, Wyse Jackson, Patrick N. (2022): Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA. Palaeontologia Electronica (a 15) 25 (2): 1-56, DOI: 10.26879/1174, URL: http://dx.doi.org/10.26879/1174
Figures 9 C-G, 10 A; Appendix 1890 Chainodictyon laxum var. minor Ulrich, p. 640, pl. 62, figs. 3 - 3 a.
Ernst, Andrej, Claussen, Anna Lene, Seuss, Barbara, Wyse Jackson, Patrick N. (2022): Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA. Palaeontologia Electronica (a 15) 25 (2): 1-56, DOI: 10.26879/1174, URL: http://dx.doi.org/10.26879/1174
Remarks. Chainodictyon minor Ulrich, 1890, differs from C. laxum Foerste, 1887, in having a smaller size of fenestrules (fenestrule width 0.65 – 1.10 mm vs. ca. 1.3 mm in C. laxum; fenestrule length 1.26 – 1.90 mm vs. 2.5 mm in C. laxum). Chainodictyon minor differs from C. angustum Schulga-Nesterenko, 1952, from the Lower Permian (Asselian) of Russia in having smaller fenestrules (fenestrule width 0.65 – 1.10 mm vs. 1.2 – 2.0 mm in C. angustum; fenestrule length 1.26 – 1.90 mm vs. 3.6 – 4.1 mm in C. angustum). Occurrence. Pennsylvanian; USA, Illinois. Graham Formation, Pennsylvanian (Virgilian); TXV- 200 (“ Spillway section at Lost Creek Lake ”), Texas, USA.
Ernst, Andrej, Claussen, Anna Lene, Seuss, Barbara, Wyse Jackson, Patrick N. (2022): Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA. Palaeontologia Electronica (a 15) 25 (2): 1-56, DOI: 10.26879/1174, URL: http://dx.doi.org/10.26879/1174
Material. SNSB-BSPG 2020 XCI 37, SNSB-BSPG 2020 XCI 38, SNSB-BSPG 2020 XCI 42, SNSB-BSPG 2020 XCI 106, SNSB-BSPG 2020 XCI 125.
Ernst, Andrej, Claussen, Anna Lene, Seuss, Barbara, Wyse Jackson, Patrick N. (2022): Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA. Palaeontologia Electronica (a 15) 25 (2): 1-56, DOI: 10.26879/1174, URL: http://dx.doi.org/10.26879/1174
Export occurrence data
Darwin Core Archive (ZIP)
CLASSIFICATION
Taxonomic Classification Tree
MULTIMEDIA
Media Files(1)
FIGURE 9. Rhombocladia delicata Rogers, 1900: (A) – transversal thin section (XCI 22c), (B) – branch longitudinal thin section (XCI 22b). Chainodictyon minor Ulrich, 1890, (C–G): C – branch fragment and colony surface showing autozooecial apertures (XCI 106); D – branch reverse side showing transversal striation (XCI 125); E–G – tangential thin section showing fenestrules, autozooecial apertures and chambers, and a leptozooecium (arrow) (XCI 37).
Imageimage/png© Ernst, Andrej;Claussen, Anna Lene;Seuss, Barbara;Wyse Jackson, Patrick N.Ernst, Andrej;Claussen, Anna Lene;Seuss, Barbara;Wyse Jackson, Patrick N.
IMAGES