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西秦岭化马地区中泥盆世早期鲁热组腕足标本甚丰,组分中除含一些典型的旧世界域成员外,土著分子较发育,构成独特的Pseudocamarophoria-Uncinulus腕足群落。该群落分异度高,密度大,贝体偏小,且多呈铰合产出,反映原地埋藏的特点;结合附生生物以及所在基底性质等方面分析,该群落处于正常含氧的近岸、浅海静水环境,相当于底栖组合3(Ben-thic Assemblage 3)的生态位(Boucot,1975)。计算的大冢系数值表明,化马地区的腕足动物群与我国华南和波兰圣十字山最接近;因此本区中泥盆世早期腕足动物地理区系划分隶属华南区。
In the early Qinzhuoma area of the West Qinling, the wrist-footed specimens of the Lugui Formation were very abundant. Except for some typical members of the Old World, the indigenous individuals developed relatively unique Pseudocamarophoria-Uncinulus brachiopods. The community is characterized by high degree of differentiation, high density and small shell body, mostly showing the hinged output, reflecting the characteristics of in situ burial. Based on the analysis of the epiphytic organisms and the nature of the substrate, the community is in the normal oxygen level Shore and shallow sea hydrostatic environment, which is equivalent to the niche of Ben-thic Assemblage 3 (Boucot, 1975). The calculated Otsuka values indicate that the brachiopod fauna in the Huma area is the closest to the South China and Poland’s Holy Cross in our country. Therefore, the geographical division of brachiopods in the area was subordinated to South China.