Numerical anomalies in the dentition of southern fur seals and sea lions (Pinnipedia: Otariidae)
Numerical anomalies in the dentition of southern fur seals and sea lions (Pinnipedia: Otariidae)
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南方毛皮海豹和海狮齿列的数字异常（鳍足纲：Otariidae）
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
C. J. Drehmer
中科院分区：
文献类型：
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作者：
C. Loch;P. C. Simões‐Lopes;C. J. Drehmer
在南美洲的三种海兔中发现了牙齿发育不全、多生牙齿和牙齿缺失的病例：澳大利亚弓头虫(Zimmermann，1783)、热带海鞘(A.tropicalis，Gray，1872)和黄腹海鞘(Otaria Figescens，Shaw，1800)。首次在巴西南部和附近地区的头骨样本中比较诊断出先天性和获得性牙齿异常。这些头骨和下颌骨是在巴西南部圣卡塔琳娜联邦大学的哺乳动物科学收藏中找到的。仅在上颌后尖牙，特别是远中尖牙(PC/6)中发现无发育，这是因为该家族中后尖牙的数量有减少的趋势。上颌和下颌多生牙齿在澳大利亚和热带澳大利亚被发现，但它们的位置与系统发育和进化意义的案例无关。在所有物种中都发现了牙齿的缺失，牙槽闭塞的不同阶段表明，这一过程在耳科动物中很常见，不会影响它们的生存。对鳍足类先天和获得性牙齿异常的研究可以为鳍足类牙齿公式的进化和食肉目动物之间的系统发育关系提供信息。
Cases of dental agenesis, supernumerary teeth and dental losses are presented in three species of South American Otariids: Arctocephalus australis (Zimmermann, 1783), A. tropicalis (Gray, 1872) and Otaria flavescens (Shaw, 1800). For the first time, congenital and acquired dental anomalies were comparatively diagnosed in skull samples from southern Brazil and nearby areas. The skulls and mandibles were accessed in the scientific collection of mammals of the Federal University of Santa Catarina, southern Brazil. Agenesis was found only among maxillary post-canine teeth, especially the distal ones (PC/6), due to an evolutionary trend towards reduction of the number of post-canine teeth in this family. Maxillary and mandibular supernumerary teeth were found in A. australis and A. tropicalis, but their positioning is unrelated to cases regarding phylogenetic and evolutionary implications. Dental losses were found in all species and different stages of alveolar obliteration suggest that this process is common in Otariids and does not affect their survival. The investigation of congenital and acquired dental anomalies in pinnipeds can provide information on dental formula evolution in Pinnipeds and in the phylogenetic relationships among Carnivora.