关于几个叶肢介化石属名的注解

Bean(1836)在上个世纪曾描述过英国约克郡北部斯卡伯勒附近格里斯托普湾(Gristhorpe Bay)中侏罗统巴柔阶(相当 E.(o.) sauzei带)克洛顿组(Cloughton Formation)格里斯托普层的一些化石,包括双壳类 Unio distortus Bean, 介形类 Cypris concentrica Bean 和 Cypris arcuata Bean (Cypris M?ller, 1776). 嗣后不久, Jones(1862)认为 C.concentrica 是一个叶肢介化石并将这个种归入了 Estheria R?ppell, 1837.本世纪50年代,苏联学者诺沃日

NOTES ON SOME CONCHOSTRACAN NOMENCLATURE

Bean (1836, p. 376) described some specimens from the horizon now known as the Gristhorpe Beds of the Cloughton Formation, Middle Jurassic, Bajocian (thought to be the E. (O.) sauzei zone) from the Gristhorpe Bay near Scarborough, North Yorkshire, United Kingdom. The specimens include the mollusc Unio distortus Bean and two ostracod species, Cypris concentrica Bean and Cypris arcuata Bean (Cypris Mller, 1776). Jones (1862, p. 101) believed that C. concentrica was a conchostra can and transferred the species to Estheria Rppell, 1837. On the basis of Jones' assignment, Novozhilov (1954) nominated C. concentrica as the type species of this new genus Trigonestheria apparently without looking at the type material. The lectotype specimen (BMNH, L. 66310) of Cypris concentrica (selected by Cox and Arkell, 1948, p. 30) is a mollusc. It is probably a syntype and even may be the original specimen Bean figured with his handwritten label stating Cypris concentrica Bean mihi.The species was assigned to Protomiodon (now Neomiodon) by Cox and Arkell (1948, p. 30), and Morris (1980, p. 38). Thus Trigonestheria is a junior subjective synonym of Neomiodon Fischer, 1887. A new generic name is therefore required for the other species originally included in 'Trigonestheria s.s., T. (T.) perennis Novozhilov, 1954, and so Shenestheria gen. nov. is proposed herein, with Trigonestheria (Trigonestheria) perennis Novozhilov, 1954 as the type species. Only the nominal subgenus is affected by this nomenclatorial act; the concepts of the other subgenera of 'Trigonestheria' remain unchanged, but they now become Shenestheria (Trigonorossiaia), S. (Rossoestheria) and S. (Indostheria).