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Oroscena carolae
Friend and Riedel, 1967
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Description - Add description
Oroscena carolae
Description: Shell single, subspherical to ellipsoidal, rarely ovoidal. Lattice coarse to fine. Upper spines club-shaped to cylindrical; lower spines variable. Lattice lamellar, with pores varying grcatly in size between specimens. Pores are usually triangular or quadrangular, sometimes slightly rounded, and often appear more rounded when viewed obliquely because of the thickness of the bars. Bars circular to elliptical in cross scction, the radiai dimension being the greater one. Ribs seldom conspicuous but can usually be distinguished in apical area, where they often form a three-rayed figure or a cross. Spines very approximately 20-40 in number. Spines on upper end of shell are radial, and those on lower end tend to be curved downward. Bases of spines rarely elevated above shell surface. Spines at upper end of shell vary from short and club-shaped to long, thin and rod-shaped, between individuai. Spines at lower end of shell rod-shaped, laterally branched, rarely digitately branched, or club-shaped with branched tip. Surface texture of spines usually rough.
Dimensions: Based on 26 specimens randomly selectcd from approximately 3,100 observed. Shell length 0.8-1.5 mm., breadth 0.8-1.4 mm. Length of spines at upper end of shell 0.8-1.0 mm. Diameter of pores 20-290ยต.
Occurrence: Oroscena carolae ranges from upper Oligocene (Chub 38, JYN V 16 P, MSN 149 P) to middle Miocene (AMPH 91 P, AMPH 105 G). It occurs in AMPH 91 P at 450 455 and 548-553 cm.; AMPH 96 P at 97-102, 297-302, 397-402, 487-492 and 537-542 cm.; AMPH 105 G at 130-135 cm.; AMPH 109 P at 234 239, 358- 363 and 435 440 cm.; AMPH 144 G at 6-7 cm.; Chub 38, bottom of core; Chub 40 at 12-20 cm.; JYN V 16 P at 98-104, 148-153, 201-206 and 254-259 cm.; JYN V 20 P at 51-56, 96-101, 148-153, 163-168, 197-202, 347-352, 384-389 and 417-422 cm.; MSN 149 P at 19-24, 45-50, 70-75, 130-135, 183-188, 206-211, 233- 238, 246-250, 286-291, 300-306 and 319-321 cm.; MSN 151 PG at 54-58 cm.; PROA 142 G at 101-106 cm.; and doubtfully in AMPH 140 G, catcher; Chub 24 at 19 24 cm.; MSN 151 P at 50-55 and 97-102 cm.
Types: Holotype (plate 2, figure 9) from MSN 149 P at 19-4 cm. (USNM No. 649479). Paratype (plate 2, figure 10) from AMPH 96 P at 97-102 cm. (USNM No. 649480); paratype (plate 3, figure 1) from JYN V 20 P at 384-389 cm. (USNM No. 649481); paratype (plate 3, figure 2) from MSN 149 P at 70-75 cm. (USNM No. 649482).
Remarks: The species is named for Miss Carol Bumgardner, who contributed very substantially to the early phases of this study. | | Friend and Riedel 1967 |
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