What is this type of slider called?

No special type, just a slide show with auto crop images and thumbnails to the left in this case, and a title (usually linkable) and a description.

It is very common.

It’s a type of Accordion Slideshow

Sorry Brandman, but it is not an accordion slideshow. Not at all. Accordion slideshows (or sliders) offer a completely different display.

Have a look at these examples:

http://codecanyon.net/item/accordion-slider-responsive-wordpress-plugin/full_screen_preview/7341927
http://designhuntr.com/40-jquery-css3-accordion-sliders-menus-tutorials-psds-plugins-websites-and-downloads/

Not an accordion slideshow in the slightest.

Here is another example of the slideshow effect you are trying to achieve:

http://coolcarousels.frebsite.nl/c/64/

You can download the source code and play around with it to create your own from this link also.