Cranial morphology of the orectolobiform shark, Chiloscyllium punctatum Müller & Henle, 1838

IF 2.4 2区 生物学 Q1 ZOOLOGY
M. Staggl, D. Abed-Navandi, J. Kriwet
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引用次数: 4

Abstract

Elasmobranchs, comprising sharks, skates, and rays, have a long evolutionary history extending back into the Palaeozoic. They are characterized by various unique traits including a predominantly cartilaginous skeleton, superficial prismatic phosphatic layer, and permanent tooth replacement. Moreover, they exhibit a more or less marked sexual dimorphism. Especially the morphology of the chondrocranium and the elements of the whole cranial region of extant and extinct chondrichthyans can provide valuable information about corresponding functions, e.g. the feeding apparatus might reflect the diet of the animals. However, studies on sexual dimorphisms are lacking in orectolobiform sharks, therefore, little is known about possible sexual dimorphic characters in the cranial region in this group. For this reason, we present in this study a comprehensive morphological description of the cranial region of the brownbanded bamboo shark Chiloscyllium punctatum Müller & Henle, 1838, with a special focus on its sexual dimorphic characters. Our results reveal clear morphological differences in both sexes of the examined C. punctatum specimens, particularly in the chondrocranium and the mandibular arch. The female specimen shows a comparatively more robust and compact morphology of the chondrocranium. This pattern is also evident in the mandibular arch, especially in the palatoquadrate. The present study is the first to describe the morphology of an orectolobiform shark species in detail using both manual dissection and micro-CT data. The resulting data furthermore provide a starting point for pending studies and are intended to be a first step in a series of comparative studies on the morphology of the cranial region of orectolobiform sharks, including the determination of possible sexual dimorphic characteristics.
额状鲨的颅骨形态,Chiloschillium punctatum Müller&Henle,1838
由鲨鱼、鳐鱼和鳐鱼组成的软体动物有着悠久的进化历史,可以追溯到古生代。它们具有各种独特的特征,包括以软骨为主的骨骼、浅棱柱状磷酸盐层和永久性牙齿置换。此外,它们表现出或多或少明显的两性异形。特别是软骨颅骨的形态以及现存和已灭绝的软骨透明体的整个颅骨区域的元素,可以提供有关相应功能的有价值的信息,例如,进食装置可能反映动物的饮食。然而,对牛脑形鲨鱼的性二型性特征的研究还很缺乏,因此,对这一群体头骨区域可能存在的性二形性特征知之甚少。因此,我们在本研究中对褐带竹鲨Chiloschillium punctatum Müller&Henle,1838的头骨区域进行了全面的形态学描述,特别关注其性二形态特征。我们的研究结果显示,被检查的点状C.punctatum标本在两性中都有明显的形态学差异,尤其是在软骨颅骨和下颌弓中。女性标本显示软骨颅骨的形态相对更加坚固和紧凑。这种模式在下颌弓中也很明显,尤其是在腭裂中。本研究首次使用手动解剖和显微CT数据详细描述了一种额状鲨鱼的形态。由此产生的数据进一步为有待进行的研究提供了一个起点,并旨在成为一系列关于牛脑形鲨鱼头骨区域形态的比较研究的第一步,包括确定可能的性二形态特征。
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来源期刊
CiteScore
4.00
自引率
19.00%
发文量
42
审稿时长
>12 weeks
期刊介绍: Research fields covered by VERTEBRATE ZOOLOGY are ta‍xo‍no‍my, mor‍pho‍logy, an‍at‍omy, phy‍lo‍ge‍ny (mo‍le‍cu‍lar and mor‍pho‍lo‍gy-based), hi‍sto‍ri‍cal bio‍geo‍gra‍phy, and pa‍lae‍on‍to‍lo‍gy of ver‍te‍bra‍tes.
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