CAJ | 학술논문

报道的叶肢介新属(Kenyaestheria gen.nov.)采自肯尼亚Maji ya Chumvi地区的一钻孔,属下三叠统上马几牙楚姆维组(Upper Maji ya Chumvi Formation),其特征为壳瓣后背缘最后几条生长线靠近背缘处形成一个凹缘构造,但生长线在背缘并不反转弯曲,同时具有放射线纹饰,据此将其归于凹缘叶肢介科(Ulugkemiidae).该科是一个灭绝的类群,分布于中泥盆统至上三叠统,古生代的类型都发现于欧亚大陆,晚三叠世的Triasu-lugkemia见于阿根廷,新属首见于早三叠世,也是在南大陆出现的第二例凹缘叶肢介类.孢粉Lunatisporites pel-lucidus和叶肢介Aquilonoglypta-Cornia-Palaeolimnadia-Falsisca组合指示含化石的地层时代为早三叠世早期.
보도적협지개신속(Kenyaestheria gen.nov.)채자긍니아Maji ya Chumvi지구적일찬공,속하삼첩통상마궤아초모유조(Upper Maji ya Chumvi Formation),기특정위각판후배연최후궤조생장선고근배연처형성일개요연구조,단생장선재배연병불반전만곡,동시구유방사선문식,거차장기귀우요연협지개과(Ulugkemiidae).해과시일개멸절적류군,분포우중니분통지상삼첩통,고생대적류형도발현우구아대륙,만삼첩세적Triasu-lugkemia견우아근정,신속수견우조삼첩세,야시재남대륙출현적제이례요연협지개류.포분Lunatisporites pel-lucidus화협지개Aquilonoglypta-Cornia-Palaeolimnadia-Falsisca조합지시함화석적지층시대위조삼첩세조기.
The new genus Kenyaestheria assigned to the family Ulugkemiidae was collected from the Upper Maji ya Chumvi Formation in the Scott Borehole, Maji ya Chumvi of Kenya. It is characterized by possessing a carapace,the last few growth lines of which forming an incurvature at the postero-dorsal margin and with radial linear sculpture. The ulugkemiids are an extinct group ranging from the Middle Devonian to the Upper Triassic. The Paleozoic forms were lived in Eurasia. The Late Triassic Triasulugkemia was reported from Argentina. The new genus is the first record from the Early Triassic and the second record in the southern continents for this group. Both spore-pollen Lunatisporites pellucidus and conchostracan Aquilonoglypta-Cornia-Palaeolimnadia-Falsisca assemblages indicate that the conchostracan-bearing beds are of early Early Triassic in age.