Quedaria asi :)
Código HTML:
<?php
?>
<?php /* If there are no posts to display, such as an empty archive page */ ?>
<?php if ( ! have_posts() ) : ?>
<div id="post-0" class="post error404 not-found">
<h1 class="entry-title"><?php _e( 'Not Found', 'monochrome' ); ?></h1>
<div class="entry-content">
<p><?php _e( 'Apologies, but no results were found for the requested archive. Perhaps searching will help find a related post.', 'monochrome' ); ?></p>
<?php get_search_form(); ?>
</div><!-- .entry-content -->
</div><!-- #post-0 -->
<?php endif; ?>
<?php
?>
<?php while ( have_posts() ) : the_post(); ?>
<?php /* How to display posts in the Gallery category. */ ?>
<?php if ( in_category( _x('gallery', 'gallery category slug', 'monochrome') ) ) : ?>
<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
<h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'monochrome' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
<div class="entry-meta">
<?php monochrome_posted_on(); ?>
</div><!-- .entry-meta -->
<div class="entry-content">
<?php if ( post_password_required() ) : ?>
<?php the_content(); ?>
<?php else : ?>
<div class="gallery-thumb">
<?php
$images = get_children( array( 'post_parent' => $post->ID, 'post_type' => 'attachment', 'post_mime_type' => 'image', 'orderby' => 'menu_order', 'order' => 'ASC', 'numberposts' => 999 ) );
$total_images = count( $images );
$image = array_shift( $images );
$image_img_tag = wp_get_attachment_image( $image->ID, 'thumbnail' );
?>
<a class="size-thumbnail" href="<?php the_permalink(); ?>"><?php echo $image_img_tag; ?></a>
</div><!-- .gallery-thumb -->
<p><em><?php printf( __( 'This gallery contains <a %1$s>%2$s photos</a>.', 'monochrome' ),
'href="' . get_permalink() . '" title="' . sprintf( esc_attr__( 'Permalink to %s', 'monochrome' ), the_title_attribute( 'echo=0' ) ) . '" rel="bookmark"',
$total_images
); ?></em></p>
<?php the_excerpt(); ?>
<?php endif; ?>
</div><!-- .entry-content -->
<div class="entry-utility">
<a href="<?php echo get_term_link( _x('gallery', 'gallery category slug', 'monochrome'), 'category' ); ?>" title="<?php esc_attr_e( 'View posts in the Gallery category', 'monochrome' ); ?>"><?php _e( 'More Galleries', 'monochrome' ); ?></a>
<span class="meta-sep">|</span>
<span class="comments-link"><?php comments_popup_link( __( 'Leave a comment', 'monochrome' ), __( '1 Comment', 'monochrome' ), __( '% Comments', 'monochrome' ) ); ?></span>
<?php edit_post_link( __( 'Edit', 'monochrome' ), '<span class="meta-sep">|</span> <span class="edit-link">', '</span>' ); ?>
</div><!-- .entry-utility -->
</div><!-- #post-## -->
<?php /* How to display all other posts. */ ?>
<?php else : ?>
<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
<h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'monochrome' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
<div class="entry-meta clearfix">
<?php monochrome_posted_on(); ?>
</div><!-- .entry-meta -->
<?php if ( is_home() || is_archive() || is_search() ) : // Only display excerpts for archives and search. ?>
<div class="entry-summary">
<?php if(has_post_thumbnail()) : ?>
<div class="thumbnail-container">
<?php the_post_thumbnail(); ?>
</div>
<?php endif; ?>
</div><!-- .entry-summary -->
<?php else : ?>
<div class="entry-content">
<?php the_content( __( 'Continue reading <span class="meta-nav">→</span>', 'monochrome' ) ); ?>
<?php wp_link_pages( array( 'before' => '<div class="page-link">' . __( 'Pages:', 'monochrome' ), 'after' => '</div>' ) ); ?>
</div><!-- .entry-content -->
<?php endif; ?>
<div class="entry-utility">
<?php if ( count( get_the_category() ) ) : ?>
<span class="cat-links">
<?php printf( __( '<span class="%1$s">Posted in</span> %2$s', 'monochrome' ), 'entry-utility-prep entry-utility-prep-cat-links', get_the_category_list( ', ' ) ); ?>
</span>
<span class="meta-sep">|</span>
<?php endif; ?>
<?php
$tags_list = get_the_tag_list( '', ', ' );
if ( $tags_list ):
?>
<span class="tag-links">
<?php printf( __( '<span class="%1$s">Tagged</span> %2$s', 'monochrome' ), 'entry-utility-prep entry-utility-prep-tag-links', $tags_list ); ?>
</span>
<span class="meta-sep">|</span>
<?php endif; ?>
<span class="comments-link"><?php comments_popup_link( __( 'Leave a comment', 'monochrome' ), __( '1 Comment', 'monochrome' ), __( '% Comments', 'monochrome' ) ); ?></span>
<?php edit_post_link( __( 'Edit', 'monochrome' ), '<span class="meta-sep">|</span> <span class="edit-link">', '</span>' ); ?>
</div><!-- .entry-utility -->
</div><!-- #post-## -->
<?php comments_template( '', true ); ?>
<?php endif; // This was the if statement that broke the loop into three parts based on categories. ?>
<?php endwhile; // End the loop. Whew. ?>
<?php /* Display navigation to next/previous pages when applicable */ ?>
<?php if ( $wp_query->max_num_pages > 1 ) : ?>
<div id="nav-below" class="navigation">
<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">←</span> Older posts', 'monochrome' ) ); ?></div>
<div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">→</span>', 'monochrome' ) ); ?></div>
</div><!-- #nav-below -->
<?php endif; ?>