Skull morphometry and vault sutures of Myrmecophaga tridactyla and Tamandua tetradactyla

IF 0.5 4区生物学 Q4 ZOOLOGY Iheringia Serie Zoologia Pub Date : 2017-10-26 DOI:10.1590/1678-4766E2017038

Camila Michele de Souza Hossotani, J. Ragusa-Netto, Hélder Silva e Luna

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引用次数: 2

Abstract

This study aimed to examine the relations between skull size and the level of cranial vault sutures closure. A total of 50 Myrmecophaga tridactyla and 178 of Tamandua tetradactyla skulls were analyzed in relation to 18 skull dimensions. The skulls were grouped into three level of suture closure: none suture closured (level 0), many sutures closured (level 1) and all the sutures closured (level 2). The results indicated that among the 18 variables measured, 17 showed significant differences (p ≤ 0.01) between immature and sub-adults skulls of T. tetradactyla ; as well as between immature and sub-adult, besides immature and adult skulls of M. tridactyla . Myrmecophaga tridactyla sub-adults and adults had no significant difference among any of the 18 dimensions. The foramen magnum height in both species showed no significant difference (p > 0.05) among any of sutures categories. In principle, suture closure level and cranial dimensions are important to estimate age group for both species of anteaters, and both T. tetradactyla and M. tridactyla immature individuals have the foramen magnum height similar to adult animals.

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三趾金翅龙和四趾塔曼达龙颅骨形态测定及穹窿缝合

本研究旨在探讨颅骨大小与颅穹窿缝合闭合水平之间的关系。对50个三趾巨齿龙颅骨和178个四趾巨齿龙颅骨进行了18种颅骨尺寸的分析。将颅骨分为未缝合缝合(0级)、缝合缝合多缝合(1级)和缝合缝合全缝合(2级)3个水平。结果表明，在测量的18个变量中，有17个变量在未成熟颅骨与亚成年颅骨之间存在显著差异(p≤0.01);除了三趾龙的未成熟头骨和成虫头骨外，在未成熟头骨和亚成虫头骨之间也存在差异。食螨三甲亚成虫和成虫在18个维度上均无显著差异。两种缝线类型间大孔高度差异无统计学意义(p > 0.05)。原则上，缝合闭合水平和颅骨尺寸对两种食蚁兽的年龄分类都很重要，而且四足食蚁兽和三足食蚁兽未成熟个体的枕骨大孔高度与成年食蚁兽相似。

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来源期刊

Iheringia Serie Zoologia 生物-动物学

CiteScore

1.00

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Iheringia, Série Zoologia, edited by the “Museu de Ciências Naturais” of the “Fundação Zoobotânica do Rio Grande do Sul”, publishes original research findings in zoology with emphasis on taxonomy, systematics, morphology, natural history, and community or population ecology of species from current Neotropical fauna. Scientific notes will not be accepted for publication. Species lists without a taxonomic approach, or that are not the result of studies on the ecology or natural history of communities will not normally be accepted. The same applies to identification keys of groups of taxa defined by political boundaries. Authors wishing to inquire about the scope of the journal or the suitability of a particular topic are encouraged to contact the Editorial Board prior to submission. Furthermore, articles with a main focus on agronomy, veterinary, zootechny or other areas involving applied zoology will not be accepted. Its abbreviated title is Iheringia, Sér. Zool., which should be used in bibliographies, footnotes and bibliographical references and strips.