Placoparia
Autor: José Castro | Publicado: 2010-03-21T13:39:00Z

<!--[if gte mso 9]>     Normal   0         21         false   false   false      PT   X-NONE   X-NONE                                                                                                     <![endif]--><!--[if gte mso 9]>                                                                                                                                                                                                                                                                                                                                                                                                                                <![endif]--> <!--  /* Font Definitions */  @font-face 	{font-family:"Cambria Math"; 	panose-1:2 4 5 3 5 4 6 3 2 4; 	mso-font-charset:1; 	mso-generic-font-family:roman; 	mso-font-format:other; 	mso-font-pitch:variable; 	mso-font-signature:0 0 0 0 0 0;} @font-face 	{font-family:Calibri; 	panose-1:2 15 5 2 2 2 4 3 2 4; 	mso-font-charset:0; 	mso-generic-font-family:swiss; 	mso-font-pitch:variable; 	mso-font-signature:-1610611985 1073750139 0 0 159 0;}  /* Style Definitions */  p.MsoNormal, li.MsoNormal, div.MsoNormal 	{mso-style-unhide:no; 	mso-style-qformat:yes; 	mso-style-parent:""; 	margin-top:0cm; 	margin-right:0cm; 	margin-bottom:10.0pt; 	margin-left:0cm; 	line-height:115%; 	mso-pagination:widow-orphan; 	font-size:11.0pt; 	font-family:"Calibri","sans-serif"; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:Calibri; 	mso-fareast-theme-font:minor-latin; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin; 	mso-bidi-font-family:"Times New Roman"; 	mso-bidi-theme-font:minor-bidi; 	mso-fareast-language:EN-US;} .MsoChpDefault 	{mso-style-type:export-only; 	mso-default-props:yes; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:Calibri; 	mso-fareast-theme-font:minor-latin; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin; 	mso-bidi-font-family:"Times New Roman"; 	mso-bidi-theme-font:minor-bidi; 	mso-fareast-language:EN-US;} .MsoPapDefault 	{mso-style-type:export-only; 	margin-bottom:10.0pt; 	line-height:115%;} @page Section1 	{size:612.0pt 792.0pt; 	margin:70.85pt 3.0cm 70.85pt 3.0cm; 	mso-header-margin:36.0pt; 	mso-footer-margin:36.0pt; 	mso-paper-source:0;} div.Section1 	{page:Section1;} --> <!--[if gte mso 10]>   /* Style Definitions */  table.MsoNormalTable 	{mso-style-name:"Tabela normal"; 	mso-tstyle-rowband-size:0; 	mso-tstyle-colband-size:0; 	mso-style-noshow:yes; 	mso-style-priority:99; 	mso-style-qformat:yes; 	mso-style-parent:""; 	mso-padding-alt:0cm 5.4pt 0cm 5.4pt; 	mso-para-margin-top:0cm; 	mso-para-margin-right:0cm; 	mso-para-margin-bottom:10.0pt; 	mso-para-margin-left:0cm; 	line-height:115%; 	mso-pagination:widow-orphan; 	font-size:11.0pt; 	font-family:"Calibri","sans-serif"; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:"Times New Roman"; 	mso-fareast-theme-font:minor-fareast; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin;}  <![endif]-->Placoparia é uma das trilobites mais comuns do Ordovícico Médio. É capaz de viver em meios variados de profundidade e de luminosidade.<!--[if gte mso 9]>     Normal   0         21         false   false   false      PT   X-NONE   X-NONE                                                                                                     <![endif]--><!--[if gte mso 9]>                                                                                                                                                                                                                                                                                                                                                                                                                                <![endif]--> <!--  /* Font Definitions */  @font-face 	{font-family:"Cambria Math"; 	panose-1:2 4 5 3 5 4 6 3 2 4; 	mso-font-charset:0; 	mso-generic-font-family:roman; 	mso-font-pitch:variable; 	mso-font-signature:-1610611985 1107304683 0 0 159 0;} @font-face 	{font-family:Calibri; 	panose-1:2 15 5 2 2 2 4 3 2 4; 	mso-font-charset:0; 	mso-generic-font-family:swiss; 	mso-font-pitch:variable; 	mso-font-signature:-1610611985 1073750139 0 0 159 0;} @font-face 	{font-family:Verdana; 	panose-1:2 11 6 4 3 5 4 4 2 4; 	mso-font-charset:0; 	mso-generic-font-family:swiss; 	mso-font-pitch:variable; 	mso-font-signature:536871559 0 0 0 415 0;}  /* Style Definitions */  p.MsoNormal, li.MsoNormal, div.MsoNormal 	{mso-style-unhide:no; 	mso-style-qformat:yes; 	mso-style-parent:""; 	margin-top:0cm; 	margin-right:0cm; 	margin-bottom:10.0pt; 	margin-left:0cm; 	line-height:115%; 	mso-pagination:widow-orphan; 	font-size:11.0pt; 	font-family:"Calibri","sans-serif"; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:Calibri; 	mso-fareast-theme-font:minor-latin; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin; 	mso-bidi-font-family:"Times New Roman"; 	mso-bidi-theme-font:minor-bidi; 	color:windowtext; 	mso-fareast-language:EN-US;} p 	{mso-style-noshow:yes; 	mso-style-priority:99; 	margin-top:0cm; 	margin-right:0cm; 	margin-bottom:16.75pt; 	margin-left:0cm; 	line-height:15.9pt; 	mso-pagination:widow-orphan; 	font-size:8.5pt; 	font-family:"Verdana","sans-serif"; 	mso-fareast-font-family:"Times New Roman"; 	mso-bidi-font-family:"Times New Roman"; 	color:#333333;} .MsoChpDefault 	{mso-style-type:export-only; 	mso-default-props:yes; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:Calibri; 	mso-fareast-theme-font:minor-latin; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin; 	mso-bidi-font-family:"Times New Roman"; 	mso-bidi-theme-font:minor-bidi; 	mso-fareast-language:EN-US;} .MsoPapDefault 	{mso-style-type:export-only; 	margin-bottom:10.0pt; 	line-height:115%;} @page Section1 	{size:612.0pt 792.0pt; 	margin:70.85pt 3.0cm 70.85pt 3.0cm; 	mso-header-margin:36.0pt; 	mso-footer-margin:36.0pt; 	mso-paper-source:0;} div.Section1 	{page:Section1;} --> <!--[if gte mso 10]>   /* Style Definitions */  table.MsoNormalTable 	{mso-style-name:"Tabela normal"; 	mso-tstyle-rowband-size:0; 	mso-tstyle-colband-size:0; 	mso-style-noshow:yes; 	mso-style-priority:99; 	mso-style-qformat:yes; 	mso-style-parent:""; 	mso-padding-alt:0cm 5.4pt 0cm 5.4pt; 	mso-para-margin-top:0cm; 	mso-para-margin-right:0cm; 	mso-para-margin-bottom:10.0pt; 	mso-para-margin-left:0cm; 	line-height:115%; 	mso-pagination:widow-orphan; 	font-size:11.0pt; 	font-family:"Calibri","sans-serif"; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:"Times New Roman"; 	mso-fareast-theme-font:minor-fareast; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin;}  <![endif]-->  As trilobites do género Placoparia possuem uma carapaça pequena, notoriamente micropígica. Possui céfalo semicircular, composto por glabela com lados subparalelos, alargando levemente para a frente, e sem área pré-glabelar. A sutura glabelar S3 é oblíqua, atingindo o sulco dorsal no canto anterior da glabela, enquanto que as soturas S1 e S2 são subperpendiculares ao sulco dorsal. A trilobite não apresenta olhos, pelo que se supõe que esta era cega.  O tórax é constituído por 11-12 segmentos, tendo a banda posterior de cada pleura inflada.  O pigídio é pequeno, possuindo ráquis com 4 anéis axiais, e uma outra peça terminal subtriangular, e igual número de costilhas pigidiais infaldas, de extremos salientes, mas arredondados, atribuindo-lhe um aspecto aracnídeo.Referencias: <!--[if gte mso 9]>     Normal   0         21         false   false   false      PT   X-NONE   X-NONE                                                                                                     <![endif]--><!--[if gte mso 9]>                                                                                                                                                                                                                                                                                                                                                                                                                                <![endif]--> <!--  /* Font Definitions */  @font-face 	{font-family:"Cambria Math"; 	panose-1:2 4 5 3 5 4 6 3 2 4; 	mso-font-charset:0; 	mso-generic-font-family:roman; 	mso-font-pitch:variable; 	mso-font-signature:-1610611985 1107304683 0 0 159 0;} @font-face 	{font-family:Calibri; 	panose-1:2 15 5 2 2 2 4 3 2 4; 	mso-font-charset:0; 	mso-generic-font-family:swiss; 	mso-font-pitch:variable; 	mso-font-signature:-1610611985 1073750139 0 0 159 0;} @font-face 	{font-family:Verdana; 	panose-1:2 11 6 4 3 5 4 4 2 4; 	mso-font-charset:0; 	mso-generic-font-family:swiss; 	mso-font-pitch:variable; 	mso-font-signature:536871559 0 0 0 415 0;}  /* Style Definitions */  p.MsoNormal, li.MsoNormal, div.MsoNormal 	{mso-style-unhide:no; 	mso-style-qformat:yes; 	mso-style-parent:""; 	margin-top:0cm; 	margin-right:0cm; 	margin-bottom:10.0pt; 	margin-left:0cm; 	line-height:115%; 	mso-pagination:widow-orphan; 	font-size:11.0pt; 	font-family:"Calibri","sans-serif"; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:Calibri; 	mso-fareast-theme-font:minor-latin; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin; 	mso-bidi-font-family:"Times New Roman"; 	mso-bidi-theme-font:minor-bidi; 	color:windowtext; 	mso-fareast-language:EN-US;} a:link, span.MsoHyperlink 	{mso-style-priority:99; 	color:blue; 	mso-themecolor:hyperlink; 	text-decoration:underline; 	text-underline:single;} a:visited, span.MsoHyperlinkFollowed 	{mso-style-noshow:yes; 	mso-style-priority:99; 	color:purple; 	mso-themecolor:followedhyperlink; 	text-decoration:underline; 	text-underline:single;} p 	{mso-style-noshow:yes; 	mso-style-priority:99; 	margin-top:0cm; 	margin-right:0cm; 	margin-bottom:16.75pt; 	margin-left:0cm; 	line-height:15.9pt; 	mso-pagination:widow-orphan; 	font-size:11.0pt; 	font-family:"Verdana","sans-serif"; 	mso-fareast-font-family:"Times New Roman"; 	mso-bidi-font-family:"Times New Roman"; 	color:#333333;} .MsoChpDefault 	{mso-style-type:export-only; 	mso-default-props:yes; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:Calibri; 	mso-fareast-theme-font:minor-latin; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin; 	mso-bidi-font-family:"Times New Roman"; 	mso-bidi-theme-font:minor-bidi; 	mso-fareast-language:EN-US;} .MsoPapDefault 	{mso-style-type:export-only; 	margin-bottom:10.0pt; 	line-height:115%;} @page Section1 	{size:612.0pt 792.0pt; 	margin:70.85pt 3.0cm 70.85pt 3.0cm; 	mso-header-margin:36.0pt; 	mso-footer-margin:36.0pt; 	mso-paper-source:0;} div.Section1 	{page:Section1;} --> <!--[if gte mso 10]>   /* Style Definitions */  table.MsoNormalTable 	{mso-style-name:"Tabela normal"; 	mso-tstyle-rowband-size:0; 	mso-tstyle-colband-size:0; 	mso-style-noshow:yes; 	mso-style-priority:99; 	mso-style-qformat:yes; 	mso-style-parent:""; 	mso-padding-alt:0cm 5.4pt 0cm 5.4pt; 	mso-para-margin-top:0cm; 	mso-para-margin-right:0cm; 	mso-para-margin-bottom:10.0pt; 	mso-para-margin-left:0cm; 	line-height:150%; 	mso-pagination:widow-orphan; 	font-size:11.0pt; 	font-family:"Calibri","sans-serif"; 	mso-ascii-font-family:Calibri; 	mso-ascii-theme-font:minor-latin; 	mso-fareast-font-family:"Times New Roman"; 	mso-fareast-theme-font:minor-fareast; 	mso-hansi-font-family:Calibri; 	mso-hansi-theme-font:minor-latin;}  <![endif]-->  http://paleoviva.fc.ul.pt/Paleogeofcul/Sebenta/08Trilobita.pdf