how to adapt legend in combination with \pgfuseplotmark

Question

I'm trying to plot several results with \addplot table, for the color and style of the lines I created a "colorlist" with \pgfplotscreateplotcyclelist.

I also scattered my results to use different markers and include them in my title additionally. scatter and \pgfuseplotmark were used. For further information go here: include plotmarks in the title of a plot

Everything works fine except the legend. The colors defined in \pgfplotscreateplotcyclelist{mycolorlist} are not executed anymore. So, it looks like this:

Only the first line of the colorlist still influences the legend. So this line is the example of what i should look like.

My question is just about the markers in the legend, the ones on the line of the plot itself are red. And they should stay red.

The Code:

\begin{filecontents*}{data.txt}
a b d c
9 1 a 2   
8 2 b 4   
7 3 c 6   
6 4 d 8   
5 5 e 10  
4 6 f 12  
3 7 g 14  
2 8 x 16  
1 9 x 18  
\end{filecontents*}
\documentclass[paper=a4,ngerman,xcolor=dvipsnames]{article}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\pgfplotsset{compat=1.14}
\usepackage{siunitx}
\usepackage{caption}
\usepackage{graphicx}
\usepackage{lipsum}

\pgfplotscreateplotcyclelist{mycolorlist}{
blue!99!black,dashed,every mark/.append style={fill=blue!10!black},mark=+\\
red!99!black,solid,every mark/.append style={fill=blue!10!black},mark=+\\
green!99!black,densely dashed,every mark/.append style={fill=blue!10!black},mark=+\\
yellow!80!black,every mark/.append style={fill=blue!10!black},mark=+\\
}

\def\showmark#1{\tikz\node[red!95!black]{\pgfuseplotmark{#1}};}

\begin{document}
\begin{figure}
  \begin{tikzpicture}
    \begin{axis}[
        grid=both,
        width=12cm, 
        height=9cm,
        axis equal,
        xtick pos=left,
        ytick pos=left,
        title style={draw,fill=none,name=legend},
        title={%
            \showmark{pentagon*}=$\SI{100}{\kilo\Hz}$,
            \showmark{triangle*}=$\SI{10}{\kilo\Hz}$,
            \showmark{square*}=$\SI{1}{\kilo\Hz}$,
            \showmark{diamond*}=$\SI{100}{\Hz}$,
            \showmark{10-pointed star}=$\SI{10}{\Hz}$,
            \showmark{oplus}=$\SI{1}{\Hz}$,
            \showmark{o}=$\SI{20}{\mHz}$},
        xlabel={R}, ylabel={Z}, 
        legend style={at={(0.02,0.98)},anchor=north west,cells={anchor=west}},
        legend style={font=\footnotesize},
        cycle list name=mycolorlist,
        scatter,
        point meta=explicit symbolic,
        scatter/classes={
          x={},% empty argument means: use the default style       
          g={mark=pentagon*,red!95!black},
          f={mark=triangle*,red!95!black},
          e={mark=square*,red!95!black},
          d={mark=diamond*,red!95!black},
          c={mark=10-pointed star,red!95!black},
          b={mark=oplus,red!95!black},
          a={mark=o,red!95!black},
          z={mark=*,red!80!black}
          },
        ]
        \addplot table [x=b,y=c, meta=d]{data.txt};
        \addplot table [x=c,y=b, meta=d]{data.txt};
        \addplot table [x=a,y=c, meta=d]{data.txt};
        \addplot table [x=b,y=a, meta=d]{data.txt};

        \legend{1, 2, 3 ,4}
   \end{axis}
  \end{tikzpicture}
\end{figure}
\end{document}