活体和化石疣鼻鲉属(啮齿目,颏鱧科)出生后头骨发育显示出一种保守模式

IF 1.5 4区 医学 Q2 ANATOMY & MORPHOLOGY
Valentina Segura, Luciano L. Rasia, Adriana M. Candela, David A. Flores
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引用次数: 0

摘要

平原维兹卡夏(Lagostomus maximus)是该属唯一的现生物种,比阿根廷和乌拉圭上新世的同属化石物种(如Lagostomus incisus)明显大。在这里,我们比较了L. maximus和L. incisus的头骨生长异速模式和性二型,将形状和大小变化与头骨功能联系起来。我们还检验了L. maximus和L. incisus的雌雄个体发育轨迹和异速生长趋势是否遵循相同的模式。两个物种的一个共同代谢模式是头骨变长,这是喙骨变长、脊枕骨突和冠状缝软骨形成的产物。我们还发现头骨缝融合的比例较低。在一些变量中,较老的雄性标本并不代表雌性轨迹的简单线性延伸,所有的二态特征都与咀嚼肌的发育有关。以前认为L. incisus具有性二型特征,这表明该属早在上新世就出现了这种现象,并暗示了多妻制和雄性竞争等社会行为。L.incisus的个体发育变化与L.maximus相似,表明该属处于保守状态。在两个物种的个体发育过程中,只有两个变化与L. incisus不同,与L. maximus相比,L. incisus出现得更早:鼻额突发育成方形,枕骨侧视呈直线形。在形态空间上,L. maximus的幼体与L. incisus的成体接近,这表明这是一个变态过程。在颞颧骨缝和额骨缝中,缝合和突触融合的顺序显示出微小的差异,这表明L. maximus的主要机械应力与体型有关。我们提出了栗鼠科的普遍生长路径,但有必要在进化水平上进行进一步分析,包括栗鼠和栗鼠。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Postnatal Skull Development Reveals a Conservative Pattern in Living and Fossil Vizcachas Genus Lagostomus (Rodentia, Chinchillidae)

The plains vizcacha, Lagostomus maximus, is the only living species in the genus, being notably larger than fossil congeneric species, such as Lagostomus incisus, from the Pliocene of Argentina and Uruguay. Here, we compare the skull growth allometric pattern and sexual dimorphism of L. maximus and L. incisus, relating shape and size changes with skull function. We also test whether the ontogenetic trajectories and allometric trends between both sexes of L. maximus follow the same pattern. A common allometric pattern between both species was the elongation of the skull, a product of the lengthening of rostrum, and chondrogenesis on the spheno-occipitalis synchondrosis and coronalis suture. We also detected a low proportion of skull suture fusion. In some variables, older male specimens did not represent a simple linear extension of female trajectory, and all dimorphic traits were related to the development of the masticatory muscles. Sexual dimorphism previously attributed to L. incisus would indicate that this phenomenon was present in the genus since the early Pliocene and suggests social behaviors such as polygyny and male-male competition. Ontogenetic changes in L. incisus were similar to L. maximus, showing a conservative condition of the genus. Only two changes were different in the ontogeny of both species, which appeared earlier in L. incisus compared to L. maximus: the development of the frontal process of the nasals in a square shape, and the straight shape of the occipital bone in lateral view. Juveniles of L. maximus were close to adult L. incisus in the morphospace, suggesting a peramorphic process. The sequence of suture and synchondroses fusion showed minor differences in temporozygomatica and frontonasalis sutures, indicating major mechanical stress in L. maximus related to size. We suggest a generalized growth path in Chinchillidae, but further analyses are necessary at an evolutionary level, including Lagidium and Chinchilla.

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来源期刊
Journal of Morphology
Journal of Morphology 医学-解剖学与形态学
CiteScore
2.80
自引率
6.70%
发文量
119
审稿时长
1 months
期刊介绍: The Journal of Morphology welcomes articles of original research in cytology, protozoology, embryology, and general morphology. Articles generally should not exceed 35 printed pages. Preliminary notices or articles of a purely descriptive morphological or taxonomic nature are not included. No paper which has already been published will be accepted, nor will simultaneous publications elsewhere be allowed. The Journal of Morphology publishes research in functional, comparative, evolutionary and developmental morphology from vertebrates and invertebrates. Human and veterinary anatomy or paleontology are considered when an explicit connection to neontological animal morphology is presented, and the paper contains relevant information for the community of animal morphologists. Based on our long tradition, we continue to seek publishing the best papers in animal morphology.
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