【摘要】 记述黑龙江伊春地区早寒武世含多门类小壳化石的以三叶虫为主的动物群 ,并依据东北北部及其紧邻俄罗斯境内的寒武纪地层及动物群特征 ,论证了东北北部地区的沉积 生物 构造古地理属于西伯利亚构造域 ,华北与西伯利亚两大构造域的对接主带应在二连浩特 西拉木伦 长春 延吉 符拉迪沃斯克一线。更多还原

【Abstract】 The Early Cambrian trilobites described in this paper were colleted from Yichun area of Heilongjiang Province. These Trilobites belonging to 10 species and 1 indeterminable species assinged to 10 genera and 8 families are systematically described here. Of which 6 species are new. BRIEF DESCRIPTION OF NEW SPECIES Family Pagetiidae Kobayashi, 1935 Subfamily Neocobboldiinae Zhang, 1980 Genus Necobboldia Resetti, 1952 Type species Cobboldia dentata Lermontova, 1940 Neocobboldia yichunensis sp. nov. (Pl.Ⅱ, figs. 3—8) Comparison This species is similar to Neocobboldia dentata Lermontova, but differs from the latter in anterior border of cephalon prominently curved forwards and sides narrowing outward, border furrow broad in the middle, narrowing outwards, with a triangular occipital spine; pygidial segments less and weak, axial rings with stout tubercles, with a pair of posterior spines. Family Dinesidae Lermontova, 1940 Genus Proerbia Lermontova, 1940 Type species Proerbia prissa Lermontova, 1940 Proerbia sinensis sp. nov. (Pl.Ⅰ, figs. 17—27) Descripsion Glabella convex, cylindrical, expanded at the median, broadly rounded in front, with three pairs of laterial glabellar furrows, the first two pairs very short, poterior pair long and deep, oblique inward and backward, reaching occipital furrow. Occipital ring with a long and strong spine. Fixigenae convex, broad, width four-fifths of central glabellar width. Preglabellar field with three bosses, one elliptical-shaped in the median, two subtriangles at sides. Anterior border strongly arculate in the median. Anterior sections slightly divergent from palpebral lobe to border, posterior sections relatively short, slanting outward and backward. Librigonae with narrower border and stouter gonal spines. Pygidium semicircular, axial lobe convex, slightly tapering backward, with 7 axial rings. Pleural fields with 5 pairs of pleural furrows. Border narrow and flat. Comparison The new species is closely allied to Proerbia prissa Lermontova, but differs in glabella strongly convex, width about a half of glabellar length, glabellar length in the front of eye ridges longer, occipital spine long and stout and anterior border strongly curved forward in the median. Family Dorypygidae Kobayashi, 1935 Genus Kootenia Lermontova, 1940 Type species Bathyuriscus (Kootenia) dawsoni Walcott, 1940 Kootenia yichunensis sp. nov. (Pl.Ⅰ, figs. 1—6; Pl.Ⅱ, fig. 14) Comparison This species is similar to Kootenia magma Lermontova, but differs in glabellar front broadly rounded and prominently narrowing in the front of ocular ridges; pygidium with less segments, axial rings without node, pygidial spines short and slender. Family Antamidae Hupé, 1953 Genus Onchocephalina Repina, 1960 Type species Onchocephalina arguta Repina, 1960 Onchocephalina yichunensis sp. nov. (Pl.Ⅰ, figs. 7—14) Comparison The new species is similar to Onchocephalina incrassa Repina, but the latter differs in glabellar furrows deeper, anterior border uniform in width, brim ornamented with finely reticulate ridges and anterior sections more divergent. Family Namanoiidae Lermontova, 1951 Genus Inouyina Poletaeva, 1936 Type species Inouyina quadratica Poletaeva, 1936 Inouyina yichunensis sp. nov. (Pl.Ⅱ, figs. 15—17) Comparison This species is closely related to Inouyina quadratica Poletaeva, but the latter differs in glabella broad, cylindrical in outline, glabellar front broadly rounded, anterior border broader, surface with small granules. Family Zacanthoidae Swinnerton, 1915 Genus Pseudozacanthopsis Repina, 1960 Type species Pseudozacanthopsis tubensis Repina, 1960 Pseudozacanthopsis yichunensis sp. nov. (Pl.Ⅰ, figs. 15,16) Comparison The new species is similar to Pseudozacanthopsis tubensis Repina, but the latter differs in glabella broad, cylindrical in outline, anterior border narrow, slightly raised up obliquely, eye ridges short and strongly oblique.更多还原