Waptia revisited: Intimations of behaviors

Strausfeld, Nicholas J.

doi:10.1016/j.asd.2015.09.001

Cited by 19 publications

(59 citation statements)

References 66 publications

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“…Although the presence of a first pair of antenniform appendages is well documented in several euarthropods, such as hymenocarines [10,11,13,14], clypecaridids [9,34], and waptiids [8,16,27], the traditional view is that most of these forms possessed largely homonomous post-antennular appendages with minimal functional specialization [5,12,13,15,20]. Alongside recent redescriptions of Burgess Shale taxa [14,16,35], E. multinodosa directly challenges this assumption, and demonstrates a level of appendicular complexity that approximates that of crown-group pancrustaceans by integrating morphologically-and implicitly functionally-differentiated tritocerebral antennae with mandibles and maxillules (Figures 1D and 2A-2D). The identification of trunk epipodites in E. multinodosa adds substantial support to this interpretation ( Figure 2E-2G; see also Figures S2H, S4G, and S4H), as these structures are widely regarded as diagnostic for pancrustaceans but have hitherto only been observed in microscopic Orsten taxa during the Cambrian [4,18,31].…”

Section: Discussionmentioning

confidence: 99%

Three-Dimensionally Preserved Appendages in an Early Cambrian Stem-Group Pancrustacean

et al. 2019

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Section: Discussionmentioning

confidence: 99%

Three-Dimensionally Preserved Appendages in an Early Cambrian Stem-Group Pancrustacean

et al. 2019

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“…Although there is evidence that some of these crustaceans were deposit feeders which may have burrowed efficiently262728, it is uncertain if they may have been able to produce branching burrows. Another group of shrimp-like arthropods known since the early Cambrian are waptiids293031. Based on morphologic evidence, it has been suggested that waptiids may have been able to burrow in various type of substrate31, although it remains unclear if they may have produced Thalassinoides -like systems.…”

Section: Discussionmentioning

confidence: 99%

“…Another group of shrimp-like arthropods known since the early Cambrian are waptiids293031. Based on morphologic evidence, it has been suggested that waptiids may have been able to burrow in various type of substrate31, although it remains unclear if they may have produced Thalassinoides -like systems.…”

Section: Discussionmentioning

confidence: 99%

The impact of deep-tier burrow systems in sediment mixing and ecosystem engineering in early Cambrian carbonate settings

Zhang¹,

Yong-an²,

Buatois

et al. 2017

Sci Rep

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Bioturbation plays a substantial role in sediment oxygen concentration, chemical cycling, regeneration of nutrients, microbial activity, and the rate of organic matter decomposition in modern oceans. In addition, bioturbators are ecosystem engineers which promote the presence of some organisms, while precluding others. However, the impact of bioturbation in deep time remains controversial and limited sediment mixing has been indicated for early Paleozoic seas. Our understanding of the actual impact of bioturbation early in the Phanerozoic has been hampered by the lack of detailed analysis of the functional significance of specific burrow architectures. Integration of ichnologic and sedimentologic evidence from North China shows that deep-tier Thalassinoides mazes occur in lower Cambrian nearshore carbonate sediments, leading to intense disruption of the primary fabric. Comparison with modern studies suggest that some of the effects of this style of Cambrian bioturbation may have included promotion of nitrogen and ammonium fluxes across the sediment-water interface, average deepening of the redox discontinuity surface, expansion of aerobic bacteria, and increase in the rate of organic matter decomposition and the regeneration of nutrients. Our study suggests that early Cambrian sediment mixing in carbonate settings may have been more significant than assumed in previous models.

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“…Waptiids are further distinguished from Clypecaris species by a trunk composed of fewer tergites, and the presence of an antenniform first appendage pair, as observed in Plenocaris 40 (Fig. 5E), Waptia 3536 (Fig. 5H), and potentially also in Pauloterminus 39 (Fig.…”

Section: Resultsmentioning

confidence: 97%

“…Raptorial limbs are rare among bivalved stem-group euarthropods, as the first pair of limbs is generally expressed as a pair of uniramous sensorial antennae with several podomeres8213536 (Fig. 5).…”

Section: Resultsmentioning

confidence: 99%

A predatory bivalved euarthropod from the Cambrian (Stage 3) Xiaoshiba Lagerstätte, South China

Yang

Ortega‐Hernández

Lan

et al. 2016

Sci Rep

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Bivalved euarthropods represent a conspicuous component of exceptionally-preserved fossil biotas throughout the Lower Palaeozoic. However, most of these taxa are known from isolated valves, and thus there is a limited understanding of their morphological organization and palaeoecology in the context of early animal-dominated communities. The bivalved euarthropod Clypecaris serrata sp. nov., recovered from the Cambrian (Stage 3) Hongjingshao Formation in Kunming, southern China, is characterized by having a robust first pair of raptorial appendages that bear well-developed ventral-facing spines, paired dorsal spines on the trunk, and posteriorly oriented serrations on the anteroventral margins of both valves. The raptorial limbs of C. serrata were adapted for grasping prey employing a descending stroke for transporting it close the mouth, whereas the backwards-facing marginal serrations of the bivalved carapace may have helped to secure the food items during feeding. The new taxon offers novel insights on the morphology of the enigmatic genus Clypecaris, and indicates that the possession of paired dorsal spines is a diagnostic trait of the Family Clypecarididae within upper stem-group Euarthropoda. C. serrata evinces functional adaptations for an active predatory lifestyle within the context of Cambrian bivalved euarthropods, and contributes towards the better understanding of feeding diversity in early ecosystems.

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Waptia revisited: Intimations of behaviors

Cited by 19 publications

References 66 publications

Three-Dimensionally Preserved Appendages in an Early Cambrian Stem-Group Pancrustacean

Three-Dimensionally Preserved Appendages in an Early Cambrian Stem-Group Pancrustacean

The impact of deep-tier burrow systems in sediment mixing and ecosystem engineering in early Cambrian carbonate settings

A predatory bivalved euarthropod from the Cambrian (Stage 3) Xiaoshiba Lagerstätte, South China

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