Vaquerosella coreyi Durham, 1955

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 coreyi Durham, 1955

Scutella norrisi Pack, 1909 . Kew, 1920. Loel and Corey, 1932.

Description (Kew, 1920). Test large, with a width of test greater than the length. Marginal outline very irregular, due to the presence of broad deep marginal notches in the ambulacra, the two posterior ones being much greater than the anterior ones, giving the test the appearance of a maple leaf; the margin is also cut by slight indentations at the sutures between the ambulacral and interambulacral areas. Test very thin, flat, and rising but little to the apex, which coincides with the apical system. Apical system slightly anterior; madreporite large, pentagonal, with four genital pores situated at each of the corners, excepting the posterior one. Petaloid ambulacra about two-thirds the width of the interambulacra at the ambitus; symmetrical, of the same length, and extending about threefifths the distance to the margin; the posterior pair slightly narrower than the others. Rows of pores extend in divergent lines for about two-thirds the length of the petal, and then converge very slightly to the end, which gives the petal a nearly wideopen appearance; each poriferous area equal to about 1/3 the width of the interporiferous area. Petals of small specimens are slightly tumid. Peristome small, subcircular and slightly posterior; with food grooves extending to the margin; indistinct branches are given off about two-thirds the distance to the edge of the test. Periproct small, round, and inframarginal, almost marginal.