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![Figure1—Baccaconularia robinsoni n. sp. from Black Hawk (BHa), 2.8 m above the base of the section, heterolithic facies, St. Lawrence Formation, Dane County, Wisconsin (Hughes and Hesselbo, 1997). All specimens darkened with India ink, and coated with ammonium chloride sublimate prior to photography. 1, Cluster of specimens on a bedding surface, paratype, UW4017-1a, ×3; 2, Holotype showing non-sulcate corner and serially invaginated midlines, UW4017-2, ×4; 3, Paratype external mold, UW4017-3, ×4; 4, Paratype, UW4017-4, ×4; 5, Paratype external mold, UW4017-5, ×4]()
![Figure3—Uncoated conulariids from the heterolithic facies, St. Lawrence Formation, northern Mississippi Valley photographed in an environmental chambered scanning electron microscope (Model ISI ABT55). 1, Baccaconularia meyeri n. sp., adapertural portion of tuberculate exoskeleton showing from left to right: corner (black arrow with white “c”) with parallel striations; external mold of face separated by scarp from composite mold of adjacent face; semiregular invaginations at midline defined by prominent ridges (white arrows) extending across the face; non sulcate corner (black arrow with white “c”), holotype UW4017-8, ×22; 2, 3, Baccaconularia robinsoni n. sp. 2. Internal and composite mold of left pair of faces and non sulcate corner, holotype, UW4017-2, ×26; 3, From left to right, non sulcate corner (black arrow with white “c”), composite mold of right face with midline invaginations separated by semi regularly spaced transverse ridges (white arrow), right external mold in lower right corner, UW4017-1, ×18; 4, Baccaconularia cf. robinsoni, showing phosphatic exoskeletal material covering external mold of tuberculate surface. Note that tuberculation is not expressed on the internal surface of the exoskeleton in this specimen, UW4017-6b, ×29; 5, Baccaconularia meyeri n. sp, external mold showing tuberculation near apical end, apex is toward bottom of figure, holotype, UW4017-8, ×60; 6, Baccaconularia robinsoni n. sp., external mold of ornament suggesting weakly-developed nodes on tubercles, UW4017-3, ×198]()
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![Figure2—Conulariids from the heterolithic facies, St. Lawrence Formation, northern Mississippi Valley. Specimens coated with ammonium chloride sublimate prior to photography. 1–3, Baccaconularia cf. robinsoni from Arcadia (AAa) Trempealeau County, Wisconsin, 10.75 m above the base of the section (Hughes and Hesselbo, 1997); 1, part, darkened with India ink prior to photography, showing specimen compressed along one corner. Adapertural portion of the exoskeleton shows external surface of two faces, apical portion shows internal surfaces of the two opposite faces. UW4017-6a, ×2; 2, counterpart of 1,UW4017-6b; 3, detail of part, showing tuberculate ornament, wrinkling and swollen internal structure, ×3.5. 4, Genus and species indet., poorly-preserved conulariid from section west of Wabasha, Wabasha County, Minnesota. Specimen lies within a horizontal tubular trace fossil defined by a color contrast in hand specimen, and by white arrows in this figure, UW4017-7a, ×1. 5, Baccaconularia meyeri n. sp. Holotype from Guy Rymans (SRa) quarry (no longer exposed) Spring Green, Sauk County, Wisconsin, UW4017-8, ×4]()
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Baccaconularia robinsoni
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Image
Figure 1 — Baccaconularia robinsoni n. sp. from Black Hawk (BHa), 2.8 m a... Available to Purchase
Published: 01 September 2000
Figure 1 — Baccaconularia robinsoni n. sp. from Black Hawk (BHa), 2.8 m above the base of the section, heterolithic facies, St. Lawrence Formation, Dane County, Wisconsin ( Hughes and Hesselbo, 1997 ). All specimens darkened with India ink, and coated with ammonium chloride sublimate prior
Image
Figure 3 —Uncoated conulariids from the heterolithic facies, St. Lawrence ... Available to Purchase
Published: 01 September 2000
with white “c”), holotype UW4017-8, ×22; 2, 3, Baccaconularia robinsoni n. sp. 2. Internal and composite mold of left pair of faces and non sulcate corner, holotype, UW4017-2, ×26; 3, From left to right, non sulcate corner (black arrow with white “c”), composite mold of right face with midline
Journal Article
LATE CAMBRIAN CONULARIIDS FROM WISCONSIN AND MINNESOTA Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 September 2000
Journal of Paleontology (2000) 74 (5): 828–838.
...Figure 1 — Baccaconularia robinsoni n. sp. from Black Hawk (BHa), 2.8 m above the base of the section, heterolithic facies, St. Lawrence Formation, Dane County, Wisconsin ( Hughes and Hesselbo, 1997 ). All specimens darkened with India ink, and coated with ammonium chloride sublimate prior...
FIGURES
Image
Figure 2 —Conulariids from the heterolithic facies, St. Lawrence Formation... Available to Purchase
Published: 01 September 2000
Figure 2 —Conulariids from the heterolithic facies, St. Lawrence Formation, northern Mississippi Valley. Specimens coated with ammonium chloride sublimate prior to photography. 1–3, Baccaconularia cf. robinsoni from Arcadia (AAa) Trempealeau County, Wisconsin, 10.75 m above the base
Journal Article
WIDESPREAD OCCURRENCE OF MICROSCOPIC PORES IN CONULARIIDS Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 February 2005
Journal of Paleontology (2005) 79 (2): 400–407.
... and Palaeontology, Nanjing, China (NIGP). We detected microscopic circular pores in 16 of the 21 species sampled ( Table 1 , Figs. 1 , 2.1–2.3 ). The five species in which pores were not detected are Archaeoconularia mirifica ( Reed, 1933 ), A . sp., Baccaconularia robinsoni Hughes, Gunderson, and Weedon...
FIGURES
