| 2021년 12월 17일 3:13 오후 |
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| general_classification: | 무척추동물(i) | → | 무척추동물 |
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| kingdom_name: | 동물 | → | Animalia (동물) |
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| phylum_name: | 극피동물 | → | Echinodermata (극피동물) |
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| class_name: | Stylophora(스타일로포라) | → | Stylophora (스타일로포라) |
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| order_name: | Cornuta(코뉴타) | → | Cornuta (코뉴타) |
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| morphological_description: | Theca heart-shaped (cordiform), with rounded, gently curved outlines. Anterior edge of thecal frame slightly concave at aulacophore insertion on lower surface and more deeply excavated on upper side. No ornamentation on lower surface of anterior marginals and lateral edges of theca. Lateral and posterior sides of theca surrounded by a thin, downwardrecurved, peripheral flange, developed by outer edges of marginals. Peripheral flange narrow and relatively steep along lateral sides, becoming wider and nearly flat posteriorly. Supracentral area delimited by narrow, raised, continuous ridge emitted by upper surface of marginals. Supracentrals extremely numerous and small, all bearing a small, blunt or club-shaped central protuberance. Thecal frame apparently made of two adorals, a zygal plate in central position, and more than nine marginals (at least four on the left and five on the right).
M1 small, quadrangular element, with concave anterior and posterior edges. M’1 T-shaped, with anterior region comparable in morphology to M1, and long, relatively narrow, gently curved posterior, zygal branch. On internal (upper) surface of M’1, zygal crest anteriorly low, increasing in height in a posterior direction, and with triangular cross section. Posterior portion of zygal crest borne by a plate in central position: the zygal plate Z. Zygal plate relatively narrow and straight, in contact with M’1 anteriorly, and with two marginals posteriorly (identified here as M4 on the right and the glossal, G on the left, by comparison with other cornutes). Zygal plate slightly wider posteriorly than anteriorly. M2 gently curved, apparently fractured into two subequal portions, and forming right anterior corner of theca. Right portion of thecal frame between M2 and Z possibly formed by two long, subequal, curved marginals (M3 and M4), or by three smaller elements (Mc, M3, and M4). Glossal pentagonal, sutured to Z and M4 (on the right), and to a small, narrow marginal on the left. M’2 well preserved, curved element, comparable in morphology to M2, forming left anterior corner of theca. M’3 gently curved marginal, slightly shorter than M’2. Sutures between more posterior left marginals hardly discernable. M’4 apparently relatively short element. Two adorals on anterior edge of upper surface, at aulacophore insertion. Left adoral A’1 more or less rounded, slightly depressed element. Right adoral A1 quadrangular plate, larger than A’1, with longitudinal groove surrounded by raised lips leading to anterior opening, at A1-M1 suture (right adoral orifice). Presence of 11 small cothurnopores (0.3–0.65 mm long), forming elongate rhombic structure in right anterior corner of supracentral area, right of A1. Cothurnopores narrow, each consisting of two U-shaped plates enclosing several tiny cones with an apical pore (generally, at least three to six cones by cothurnopore). Proximal aulacophore slightly flexed leftwards, and made of 10 telescopic rings. Each ring consisting of two inferolaterals (below) and two tectals (above), with inferolaterals and tectals nearly subequal in size and joining at about lateral midline. Lower surface of proximal aulacophore flat and upper surface strongly convex, domed. Anterior edge of each ring slightly raised and overlapping depressed posterior portion of next, more anterior (distal) ring. Stylocone funnel-shaped, with enlarged posterior region, and straight, narrower distal portion. Lower surface of stylocone nearly smooth and rounded. Upper (internal) surface of stylocone showing deep proximal notch, longitudinal median groove, with two pairs of transverse channels leading to lateral depressions. Two pairs of opened cover plates articulated to stylocone. Four ossicles preserved anteriorly to stylocone, showing similar smooth lower surface, longitudinal median groove and one pair of transverse channels on internal side. Two cover plates preserved in open position articulated to lateral edges of each ossicle. | → | Theca heart-shaped (cordiform), with rounded, gently curved outlines. Anterior edge of thecal frame slightly concave at aulacophore insertion on lower surface and more deeply excavated on upper side. No ornamentation on lower surface of anterior marginals and lateral edges of theca. Lateral and posterior sides of theca surrounded by a thin, downwardrecurved, peripheral flange, developed by outer edges of marginals. Peripheral flange narrow and relatively steep along lateral sides, becoming wider and nearly flat posteriorly. Supracentral area delimited by narrow, raised, continuous ridge emitted by upper surface of marginals. Supracentrals extremely numerous and small, all bearing a small, blunt or club-shaped central protuberance. Thecal frame apparently made of two adorals, a zygal plate in central position, and more than nine marginals (at least four on the left and five on the right).
M1 small, quadrangular element, with concave anterior and posterior edges. M’1 T-shaped, with anterior region comparable in morphology to M1, and long, relatively narrow, gently curved posterior, zygal branch. On internal (upper) surface of M’1, zygal crest anteriorly low, increasing in height in a posterior direction, and with triangular cross section. Posterior portion of zygal crest borne by a plate in central position: the zygal plate Z. Zygal plate relatively narrow and straight, in contact with M’1 anteriorly, and with two marginals posteriorly (identified here as M4 on the right and the glossal, G on the left, by comparison with other cornutes). Zygal plate slightly wider posteriorly than anteriorly. M2 gently curved, apparently fractured into two subequal portions, and forming right anterior corner of theca. Right portion of thecal frame between M2 and Z possibly formed by two long, subequal, curved marginals (M3 and M4), or by three smaller elements (Mc, M3, and M4). Glossal pentagonal, sutured to Z and M4 (on the right), and to a small, narrow marginal on the left. M’2 well preserved, curved element, comparable in morphology to M2, forming left anterior corner of theca. M’3 gently curved marginal, slightly shorter than M’2. Sutures between more posterior left marginals hardly discernable. M’4 apparently relatively short element. Two adorals on anterior edge of upper surface, at aulacophore insertion. Left adoral A’1 more or less rounded, slightly depressed element. Right adoral A1 quadrangular plate, larger than A’1, with longitudinal groove surrounded by raised lips leading to anterior opening, at A1-M1 suture (right adoral orifice). Presence of 11 small cothurnopores (0.3–0.65 mm long), forming elongate rhombic structure in right anterior corner of supracentral area, right of A1. Cothurnopores narrow, each consisting of two U-shaped plates enclosing several tiny cones with an apical pore (generally, at least three to six cones by cothurnopore). Proximal aulacophore slightly flexed leftwards, and made of 10 telescopic rings. Each ring consisting of two inferolaterals (below) and two tectals (above), with inferolaterals and tectals nearly subequal in size and joining at about lateral midline. Lower surface of proximal aulacophore flat and upper surface strongly convex, domed. Anterior edge of each ring slightly raised and overlapping depressed posterior portion of next, more anterior (distal) ring. Stylocone funnel-shaped, with enlarged posterior region, and straight, narrower distal portion. Lower surface of stylocone nearly smooth and rounded. Upper (internal) surface of stylocone showing deep proximal notch, longitudinal median groove, with two pairs of transverse channels leading to lateral depressions. Two pairs of opened cover plates articulated to stylocone. Four ossicles preserved anteriorly to stylocone, showing similar smooth lower surface, longitudinal median groove and one pair of transverse channels on internal side. Two cover plates preserved in open position articulated to lateral edges of each ossicle. |
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| gps_data: | 37°04’19”N
129°08’39”E | → | 37°04’19”N129°08’39”E |
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| specimen_status: | OSOS | → | |
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| preservation_status: | 외형본(Em) | → | 외형본 |
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| acquisition_type: | 기증(Donated) | → | 기증 |
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| reference_info: | Lee, S-B., Lefebvre, B,m and Choi, D.K. (2016) Latest Cambrian cornutes (Echinodermata: Stylophora) from the Taebaeksan Basin, Korea. Journal of Paleontology, 79, 139-151 | → | Lee, S-B., Lefebvre, B,m and Choi, D.K. (2016) Latest Cambrian cornutes (Echinodermata: Stylophora) from the Taebaeksan Basin, Korea. Journal of Paleontology, 79, 139-151 |
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| final_rating: | 나(국가등록필요) | → | 나 |
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| modified_by: | | → | dclee |
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