摘要
1982年夏,笔者在检查湘西凤凰山江千公坪剖面时,采获一批晚寒武世三叶虫化石,其中包括本文记述的新种Tamdaspis brevilimbus sp. nov。Tamdaspis最初见于苏联哈萨克,为(1977)所建。其后相继在我国新疆(张太荣,1981)和安徽(仇洪安等,1983)发现。最近在哈萨克又找到一些新材料(Apollonov et al.,1984)。安徽的材料,经钱义元、仇洪安鉴定,认为是一新属,命名为Psiloyuepingia Qian et Qiu,1983。Tamdaspis是一个比较特征的刺尾虫类(ceratopygids)三叶虫(尽管尾部缺乏侧刺)。
Tamdaspis brevilimbus sp. nov., a new species of Tamdaspis Lisogor, 1977, is described and figured from the mid-upper part of the Shenjiawan Formation at Qiangongping, Fenghuang County, western Hunan. The new material proves the first record of Tamdaspis in Hunan and adds to the genus the morphology of the librigena, the hypostoma and the pygidial doublure. Psiloyuepingia Qian and Qiu, 1983 is considered to be a junior synonym of Tamdaspis. The genus is regarded as a ceratopygid and placed in the subfamily Macropyginae that is here referred to the family Ceratopygidae, according to Fortey and Chatterton (1988).
Family Ceratopygidae Linnarsson, 1869 Subfamily Macropyginae Kobayashi, 1937 [=Iwanyaspidinae Kobayashi, 1962] Genus Tamdaspis Lisogor, 1977 [=Psiloyuepingia Qian et Qiu, 1983] Tamdaspis brevilimbus sp. nov. (Fl. Ⅰ, figs. 1—13; Text-fig. 1)
Name Derived from Latin—brevis, short, and limbus, border, referring to the narrow (sag.) preglabellar area.
Holotype Here designated, an incomplete cranidium, NIGP133838 (P1. Ⅰ, fig. 3).
Diagnosis A species of Tamdaspis with glabella twice as long as wide, defined laterally by sinuous, subparallel axial furrows; palpebral lobe large, with width (tr.) more than half of that of glabella; preocular sections of facial suture strongly divergent forward; width (sag.) of preglabellar area equal to one-fourth of the length of glabella; librigena with genal spine and very broad lateral border furrow; pygidium with conspicuous and dense lirae.
Description Cranidium with angulate anterior margin. Glabella large, rectangular in outline, moderately convex and slightly expanded outward in front of palpebral lobes, with a width of about 1/2 length. Three to four pairs of glabellar furrows: preoccipital furrow bifurcated, with the anterior branch deeply incised and anteriorly directed and the posterior one shallow and transverse; 2p gently impressed, isolated from the axial furrow; 3p short and faint, running inward and forward
出处
《古生物学报》
CAS
CSCD
北大核心
1990年第5期637-644,668,共8页
Acta Palaeontologica Sinica
