Allometry in Late Devonian Podocopa ostracods (Crustacea) and its implications for ostracod ontogeny

IF 2.3 2区 地球科学 Q1 PALEONTOLOGY
Junjun Song, Bing Huang, Wenkun Qie
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引用次数: 0

Abstract

Podocopa ostracods have abounded in various marine and non‐marine habitats since the early Palaeozoic and left a diverse fossil record in strata worldwide. This is particularly useful for stratigraphic correlation and palaeoenvironmental and palaeogeographical reconstructions. However, despite being the most numerous ostracods during the Palaeozoic, their origins, evolution, ontogeny and phylogeny remain poorly defined. This paper represents the first study of morphological variation in Devonian Platycopida ostracods (an order of Podocopa) using a geometric morphometric approach. Our results identify substantial shape variation in Cribroconcha honggulelengensis Song & Crasquin from the Upper Devonian Hongguleleng Formation of western Junggar, northwest China, demonstrating a remarkable change in juveniles between stages A‐3 and A‐2. Using linear regressions between principal component scores from right lateral view and carapace length, we demonstrate allometric growth patterns for this species. The body plan of C. honggulelengensis developed along an ontological variable: from an ovate outline with rare pores to an oblong outline with dense and large pores. Environmental factors should play an important role in shape determination during ontogeny of C. honggulelengensis.
晚泥盆世足足甲壳类介形类异速发育特征及其对介形类个体发育的意义
早古生代以来,足足类介形类在各种海洋和非海洋生境中大量存在,并在世界范围内的地层中留下了丰富的化石记录。这对地层对比和古环境古地理重建特别有用。然而,尽管它们是古生代数量最多的介形类,但它们的起源、演化、个体发育和系统发育仍不清楚。本文首次用几何形态计量学方法研究了泥盆纪鸭嘴兽甲壳类(足足目)的形态变异。研究结果表明,准噶尔西部上泥盆统红古冷组的Cribroconcha honggulelenggensis Song & Crasquin组在a‐3和a‐2阶段的幼体形态发生了显著变化。利用右侧视角的主成分得分与甲壳长度之间的线性回归,我们证明了该物种的异速生长模式。红gulelengensis的身体平面沿着一个本体论变量发展:从具有稀少气孔的卵形轮廓到具有密集和大气孔的长圆形轮廓。环境因素在红谷兰个体发育过程中对其形态的决定起着重要作用。
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来源期刊
Papers in Palaeontology
Papers in Palaeontology PALEONTOLOGY-
CiteScore
4.50
自引率
4.30%
发文量
55
期刊介绍: Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.
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