860


Journal of Paleontology 92(5):850–871


Figure 6. Anomalocrinus astrictus n. sp., paratypes: (1–2) A-ray lateral view of partially disarticulated crown and column, UMMP 74663; (1) note arm branching and brachial morphology, enlargement of Figure 6.2; (2) crown with column; (3) D-ray lateral view of partially disarticulated crown with column, note compound (compare to Figure 5.3), UMMP 74662. Scale bars=5.0mm.


(2) brachials rectilinear uniserial or cuneate uniserial; and (3) brachial plates wider than high or higher than wide. As discussed below, two species of Cremacrinus occur in


the Brechin fauna, one with the E-ray arm undivided and rectilinear uniserial brachials that are wider than high and the other with E-ray arm undivided and cuneate uniserial brachials that are higher than wide. These are regarded below as C. inaequalis and C. guttenbergensis Kolata, 1975, respectively.


Cremacrinus guttenbergensis Kolata, 1975 Figure 8.4, 8.5


1975 Cremacrinus guttenbergensis Kolata, p. 23, fig. 6, pl. 3, figs. 10, 14.


1982 Cremacrinus guttenbergensis; Brower, p. 92. 1983 Cremacrinus guttenbergensis; Brower and Strimple, p. 1277, figs. 10a–c, 11a–c.


1986 Cremacrinus guttenbergensis; Webster, p. 105. 1988 Cremacrinus guttenbergensis; Brower, p. 919.


1988 Cremacrinus guttenbergensis; Webster, p. 60. 1993 Cremacrinus guttenbergensis; Webster, p. 41.


2013 Cremacrinus guttenbergensis; Webster and Webster, p. 1121.


Holotype.—BMNH PK-45.


Diagnosis.—Cremacrinus with coarsely pitted aboral cup sculpture; aboral cup wider than high; aboral cup plates not swollen; axil arms two; axillaries not swollen; arms robust; brachials cuneate or rectilinear uniserial and higher than wide; B arm smaller than A and D arms; E-ray arm unbranched.


Occurrence.—This taxon was founded on specimens from the Guttenberg Formation (Galena Group) in Illinois and Wisconsin (Katian), USA. Subsequently it has been recovered from the Mortimer and Sherwood members of the Dunleith Formation (Sandbian) of Illinois, Iowa, and Minnesota, and the Trenton Formation in New York (Katian), USA. In the Brechin Lagerstätte, this species of Cremacrinus is known from the Bobcaygeon-Verulam contact zone at theCardenQuarry (UMMP 74664, UMMP 74665.1) and from the upper Bobcaygeon For- mation at the Kirkfield Quarry and Tomlinson Quarry (Ordovi- cian, Katian).


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