SEM study of Sandersiella chilenica sp.nov. (Cephalocarida), with a review of the Integumentary Structures and Functional Adaptations in the Group

Stuardo, José R.; Vega, René González de la

doi:10.4067/s0717-65382011000100007

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…2000; Zimmer et al . 2009; Stuardo & Vega 2011; Keiler & Richter 2011). In our scheme the categories A, B, C and D refer to hollow projections (spines and/or setae) that can be broadly characterized as simple, serrate, pappose and plumose, respectively, whereas category E contains unusual blunt‐tipped forms, and category F contains solid setules, denticles and scales arising directly from the cuticle.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

A new species of early Cambrian arthropod reconstructed from exceptionally preserved mandibles and associated small carbonaceous fossils (SCFs)

Harvey

Butterfield

2022

Papers in Palaeontology

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Mandibulate arthropods (myriapods, hexapods and crustaceans) account for a major component of extant animal diversity but their origins remain unclear. Here, we re-examine the record of exceptionally preserved arthropodan microfossils, including mandibles, from the lower Cambrian (Stage 4) Mount Clark Formation, Northwest Territories, Canada. The assemblage comes from a single drillcore horizon and occurs as thousands of small carbonaceous fossils (SCFs) representing disarticulated body parts. The mandibles occur as isolated molar surfaces with an elongate outline, a heavy setal fringe, and a subtle right-left asymmetry. These are sufficiently distinctive to diagnose a new genus and species of arthropod, Masticaris fimbriata. Co-occurring SCFs include diverse appendage lobes and ventral body fragments, along with spines and setae assignable to 53 morphological categories and occurring either singly or in arrays, including filter plates. Most are plausibly interpreted as belonging to the feeding apparatus of M. fimbriata. The mandibles and filter plates correspond to those in extant pancrustaceans, particularly branchiopods, although the mouthparts of some more basal Cambrian arthropods raise the possibility of convergent feeding adaptations. Overall, anatomical and taphonomic continuity with younger SCFs suggests that M. fimbriata belongs to an early pancrustacean radiation that is still largely cryptic in the fossil record. More generally, the assemblage provides an inventory of fine-scale cuticular specializations in early Cambrian arthropods that prefigure the trophic versatility and ecological dominance of crustaceans in the modern marine fauna.

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Section: Systematic Palaeontologymentioning

confidence: 99%

A new species of early Cambrian arthropod reconstructed from exceptionally preserved mandibles and associated small carbonaceous fossils (SCFs)

Harvey

Butterfield

2022

Papers in Palaeontology

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“…Studies in decapods and other crustaceans determined that a comparison of the morphology and distribution of setae in crustaceans is useful in understanding how the animal senses its environment, finds and manipulates its food and grooms itself. Setal morphology can also be valuable in phylogenetic and taxonomic studies (Watling, 1989;Stuardo & Vega, 2011). Furthermore, knowledge of crustacean mouthparts is often used to understand the ecology, evolution and phylogeny of various species (Bruce, 1986;Coelho & Rodrigues, 2001;Karanovic et al, 2011;Geiselbrecht & Melzer, 2013).…”

Section: Introductionmentioning

confidence: 99%

Mouthparts and their setae of the intertidal isopod Cirolana harfordi

Thomson

2013

Journal of Microscopy

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SummaryThe cirolanid isopod Cirolana harfordi is described as a scavenger and a predator that lives in the intertidal region. In order to understand the microanatomy of the mouthparts and the setae that allow this animal to handle and eat its food, a scanning electron microscopy study was conducted. C. harfordi displays a variety in the types of setae distributed on its mouthparts in a site-specific fashion, including complex setae placed on the medial edge of the maxilliped and maxilla. Terminal pores in some setae were found to contain a cupule, which is a hemispherical structure, housed in the concave recess of the pore, which demonstrates that the pore is more than merely a thinning of the cuticle as has been proposed. Future studies on setal morphology are needed for comparative microanatomy of cirolanid isopods.

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Reproductive system morphology ofLightiella magdalenina(Crustacea, Cephalocarida): functional and adaptive implications

Addis

Fabiano

Delogu

et al. 2013

Invertebrate Reproduction & Development

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SEM study of Sandersiella chilenica sp.nov. (Cephalocarida), with a review of the Integumentary Structures and Functional Adaptations in the Group

Abstract: Estudio con microscopia de barrido de Sandersiella chilenica n. sp. (Cephalocarida), con una revisión de las Estructuras del Integumento y Adaptaciones Funcionales en el Grupo

Cited by 7 publications

References 41 publications

A new species of early Cambrian arthropod reconstructed from exceptionally preserved mandibles and associated small carbonaceous fossils (SCFs)

A new species of early Cambrian arthropod reconstructed from exceptionally preserved mandibles and associated small carbonaceous fossils (SCFs)

Mouthparts and their setae of the intertidal isopod Cirolana harfordi

Reproductive system morphology ofLightiella magdalenina(Crustacea, Cephalocarida): functional and adaptive implications

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