Vaquerosella merriami (Anderson, 1905)

Martínez-Melo, Alejandra & Alvarado-Ortega, Jesús, 2020, Vaquerosella perrillatae sp. nov.: A Miocene species of Echinarachniidae (Echinodermata: Clypeasteroida) from Baja California Sur, Mexico, Palaeontologia Electronica (a 14) 23 (1), pp. 1-18 : 8

Vaquerosella merriami (Anderson, 1905)

Astrodapsis merriami Anderson, 1905 .

Scutella merriami . Arnold, 1909.

Scutella (?) merriami . Clark and Twitchell, 1915.

Scutella andersoni Twitchell. Loel and Corey, 1932 . Echinarachnius merriami . Grant and Hertlein, 1933.

Vaquerosella merriami . Adegoke, 1969.

Description (Clark and Twitchell, 1915). The marginal outline is usually circular, but sometimes longitudinal oval. The marginal notches are often hardly discernible. The test shows a decided tendency to form elevated stars on the upper surface. The petals extend from one-half to two-thirds the way to the margin. In some specimens the petals were practically flush with the surface and in some were slightly tumid. In some the poriferous zones of all the petals diverge continuously and are wide open at the ends, though the odd petal is somewhat more widely open than the rest; in others those of all but the odd petal is partly closed. The poriferous zones in the paired petals diverge for about half their length, then converge to a less degree so that, at their ends, they are only slightly bearer together than midway; those pores of the anterior petal diverging continuously to their ends, where they are far apart, the inner lines of pores forming a well-defined V.