| 2021년 12월 17일 3:12 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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| scientific_name: | Genus and species indeterminate Form B | → | Genus and species indeterminate Form B |
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| morphological_description: | Preserved portion of thecal frame consisting of six marginals and a zygal plate. Regularly curved and almost smooth thecal outlines, with slight anterior concavity at the aulacophore insertion. Extremely reduced ornamentation on lower thecal surface, comprising a low, downward-directed ridge along the anterior edge of the theca (M’1, M1, and anterior portion of M2), and a small, triangular, blunt, spinal blade borne by M3. Numerous, small protuberances forming two, possibly three, more-orless regular longitudinal rows on lateral, external flanks of right marginals M2 (posterior portion), Mc, and M3 (anteriorly to spinal blade).
M1 subrectangular, large element, with sinuous anterior and posterior edges. M’1 L-shaped, with massive anterior region comparable in morphology and extension to M1, and thinner, apparently relatively short posterior, zygal portion. Articulation facets for A’1 and A1 present on upper surface of M’1 and M1, respectively. Right side of theca consisting of three marginals between M1 and zygal plate, Z: M2, Mc, and M3. M2 regularly arched plate forming right anterior corner of thecal frame. Mc straight to slightly curved marginal forming most of right side of theca. Length of Mc comparable to that of M2. M3 small, curved element forming right posterior corner of theca and bearing reduced spinal blade. No marginal M4 above Z. Upper thecal surface covered by several dozens of small, polygonal supracentral platelets. Low, blunt protuberance on upper (external) surface of each supracentral. Presence of about four relatively large cothurnopores in right anterior corner of upper thecal surface. Each cothurnopore made of two U-shaped plates, with anterior element longer than posterior one. Cothurnopores in central position larger than lateral ones.
Proximal portion of aulacophore consisting of eight imbricated rings. Each ring overlapped by its more posterior (proximal) neighbor. Upper surface of rings made of two series of small tectals, missing or possibly collapsed into proximal aulacophore cavity. Lower surface and lateral walls of each proximal ring made of two subequal, symmetrical inferolaterals. Lower surface of inferolaterals flat to slightly convex, with raised anterior edge and more depressed posterior region. Sharp, protruding facet developed on lower abaxial (lateral) corner of each inferolateral, for articulation with a small, spiny element. At least two such spines preserved along right side of proximal aulacophore, articulated to rings 3 and 4. Arm consisting at least of 12 brachials (stylocone and 11 more distal ossicles) and two series of open, partly collapsed cover plates. Brachials rapidly decreasing in size distally. Low longitudinal median crest on lower surface of brachials. Upper surface of brachials poorly preserved, showing longitudinal median furrow. Proximal notch visible on internal surface of stylocone. Stylocone funnel-shaped, long, and narrow (length approximately 0.8 mm). Two pairs of cover plates articulated to stylocone, and one pair to each ossicle. Fan-shaped cover plates, with massive, narrow lower extremity, and thinner, wider, curved upper edge. Ornamentation consisting of radiating lines on external surface of cover plates. | → | Preserved portion of thecal frame consisting of six marginals and a zygal plate. Regularly curved and almost smooth thecal outlines, with slight anterior concavity at the aulacophore insertion. Extremely reduced ornamentation on lower thecal surface, comprising a low, downward-directed ridge along the anterior edge of the theca (M’1, M1, and anterior portion of M2), and a small, triangular, blunt, spinal blade borne by M3. Numerous, small protuberances forming two, possibly three, more-orless regular longitudinal rows on lateral, external flanks of right marginals M2 (posterior portion), Mc, and M3 (anteriorly to spinal blade).
M1 subrectangular, large element, with sinuous anterior and posterior edges. M’1 L-shaped, with massive anterior region comparable in morphology and extension to M1, and thinner, apparently relatively short posterior, zygal portion. Articulation facets for A’1 and A1 present on upper surface of M’1 and M1, respectively. Right side of theca consisting of three marginals between M1 and zygal plate, Z: M2, Mc, and M3. M2 regularly arched plate forming right anterior corner of thecal frame. Mc straight to slightly curved marginal forming most of right side of theca. Length of Mc comparable to that of M2. M3 small, curved element forming right posterior corner of theca and bearing reduced spinal blade. No marginal M4 above Z. Upper thecal surface covered by several dozens of small, polygonal supracentral platelets. Low, blunt protuberance on upper (external) surface of each supracentral. Presence of about four relatively large cothurnopores in right anterior corner of upper thecal surface. Each cothurnopore made of two U-shaped plates, with anterior element longer than posterior one. Cothurnopores in central position larger than lateral ones.
Proximal portion of aulacophore consisting of eight imbricated rings. Each ring overlapped by its more posterior (proximal) neighbor. Upper surface of rings made of two series of small tectals, missing or possibly collapsed into proximal aulacophore cavity. Lower surface and lateral walls of each proximal ring made of two subequal, symmetrical inferolaterals. Lower surface of inferolaterals flat to slightly convex, with raised anterior edge and more depressed posterior region. Sharp, protruding facet developed on lower abaxial (lateral) corner of each inferolateral, for articulation with a small, spiny element. At least two such spines preserved along right side of proximal aulacophore, articulated to rings 3 and 4. Arm consisting at least of 12 brachials (stylocone and 11 more distal ossicles) and two series of open, partly collapsed cover plates. Brachials rapidly decreasing in size distally. Low longitudinal median crest on lower surface of brachials. Upper surface of brachials poorly preserved, showing longitudinal median furrow. Proximal notch visible on internal surface of stylocone. Stylocone funnel-shaped, long, and narrow (length approximately 0.8 mm). Two pairs of cover plates articulated to stylocone, and one pair to each ossicle. Fan-shaped cover plates, with massive, narrow lower extremity, and thinner, wider, curved upper edge. Ornamentation consisting of radiating lines on external surface of cover plates. |
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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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| 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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