Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Brachiopod
Table title:
Taxonomical history
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > "Traditional" classification </th><th colspan=3 rowspan=1 > Inarticulata </th><th colspan=2 rowspan=1 > Articulata </th></tr>
<tr> <th colspan=1 rowspan=1 > "Calciata" approach </th><th colspan=2 rowspan=1 > Lingulata </th><th colspan=3 rowspan=1 > Calciata </th></tr>
<tr> <th colspan=1 rowspan=1 > Three-part approach </th><th class="highlighted"  colspan=2 rowspan=1 > Linguliformea </th><th colspan=1 rowspan=1 > Craniformea </th><th class="highlighted"  colspan=2 rowspan=1 > Rhynchonelliformea </th></tr>
<tr> <th colspan=1 rowspan=1 > Orders </th><th class="highlighted"  colspan=1 rowspan=1 > Lingulida </th><th class="highlighted"  colspan=1 rowspan=1 > Discinida </th><th colspan=1 rowspan=1 > Craniida </th><th class="highlighted"  colspan=1 rowspan=1 > Terebratulida </th><th class="highlighted"  colspan=1 rowspan=1 > Rhynchonellida </th></tr>
<tr> <th colspan=1 rowspan=1 > Hinge </th><td colspan=3 rowspan=1 > No teeth </td><td colspan=2 rowspan=1 > Teeth and sockets </td></tr>
<tr> <th colspan=1 rowspan=1 > Anus </th><td colspan=3 rowspan=1 > On front of body, at end of U-shaped gut </td><td colspan=2 rowspan=1 > None </td></tr>
<tr> <th colspan=1 rowspan=2 > Pedicle </th><td colspan=2 rowspan=1 > Contains coelom with muscles running through </td><td colspan=1 rowspan=1 > No pedicle </td><td colspan=2 rowspan=1 > No coelom, muscles where joins body </td></tr>
<tr> <td colspan=1 rowspan=1 > Long, burrows </td><td colspan=1 rowspan=1 > Short, attached to hard surfaces </td><td colspan=1 rowspan=1 > None, cemented to surface </td><td colspan=2 rowspan=1 > Short, attached to hard surfaces </td></tr>
<tr> <th colspan=1 rowspan=1 > Periostracum </th><td colspan=2 rowspan=1 > Glycosaminoglycans and chitin </td><td colspan=1 rowspan=1 > Chitin </td><td colspan=2 rowspan=1 > Proteins </td></tr>
<tr> <th colspan=1 rowspan=1 > Primary (middle) mineralized layer of shell </th><td colspan=2 rowspan=1 > Glycosaminoglycans and apatite (calcium phosphate) </td><td colspan=3 rowspan=1 > Calcite (a form of calcium carbonate) </td></tr>
<tr> <th colspan=1 rowspan=1 > Inner mineralized layer of shell </th><td colspan=2 rowspan=1 > Collagen and other proteins, chitinophosphate and apatite (calcium phosphate) </td><td colspan=1 rowspan=1 > Calcite </td><td colspan=2 rowspan=1 > Proteins and calcite </td></tr>
<tr> <th colspan=1 rowspan=1 > Chaetae around opening of shells </th><td colspan=2 rowspan=1 > Yes </td></tr>
<tr> <th colspan=1 rowspan=1 > Coelom fully divided </th><td colspan=2 rowspan=1 > Yes </td><td colspan=1 rowspan=1 > No </td><td colspan=2 rowspan=1 > Yes </td></tr>
</table>
Question:
How are the Lingulida and Discinida grouped? 
Answer:
In Brachiopod, the Lingulida and Discinida are grouped as Linguliformea, and the Rhynchonellida and Terebratulida as Rhynchonelliformea.