Revision of the Balanid Barnacle Genus <i>Concavus</i> Newman, 1982, with the Description of a New Subfamily, Two New Genera, and Eight New Species

Zullo, Victor A.

doi:10.1017/s0022336000060947

Cited by 17 publications

(28 citation statements)

References 6 publications

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“…As would be expected based on the outcome of the full experiment, barnacle wall plates and opercular plates are often found in the fossil record (e.g. Darwin ; Buckeridge ; Zullo ; Carriol & Schneider ; Collins et al . ; Gale & Sørensen ; Klompmaker et al .…”

Section: Discussionsupporting

confidence: 53%

Comparative experimental taphonomy of eight marine arthropods indicates distinct differences in preservation potential

2017

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Global biodiversity patterns in deep time can only be understood fully when the relative preservation potential of each clade is known. The relative preservation potential of marine arthropod clades, a diverse and ecologically important component of modern and past ecosystems, is poorly known. We tackled this issue by carrying out a 205-day long comprehensive, comparative, taphonomic experiment in a laboratory by scoring up to ten taphonomic characters for multiple specimens of seven crustacean and one chelicerate species (two true crabs, one shrimp, one lobster, one hermit crab, one stomatopod, one barnacle and one horseshoe crab). Although the results are preliminary because we used a single experimental setup and algal growth partially hampered observations, some parts of hermit crabs, stomatopods, swimming crabs and barnacles decayed slowly relative to other parts, implying differential preservation potentials within species, largely consistent with the fossil record of these groups. An inferred parasitic isopod, manifested by a bopyriform swelling within a hermit crab carapace, decayed relatively fast.We found limited variation in the decay rate between conspecifics, and we did not observe size-related trends in decay rate. Conversely, substantial differences in the decay rate between species were seen after c. 50 days, with shrimps and stomatopods decaying fastest, suggesting a relatively low preservation potential, whereas the lobster, calico crabs, horseshoe crabs and barnacles showed relatively slow decay rates, suggesting a higher preservation potential. These results are supported by two modern and fossil record-based preservation potential metrics that are significantly correlated to decay rate ranks. Furthermore, we speculate that stemward slippage may not be ubiquitous in marine arthropods. Our results imply that diversity studies of true crabs, lobsters, horseshoe crabs and barnacles are more likely to yield patterns that are closer to their true biodiversity patterns than those for stomatopods, shrimps and hermit crabs.

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Section: Discussionsupporting

confidence: 53%

Comparative experimental taphonomy of eight marine arthropods indicates distinct differences in preservation potential

2017

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“…Both taxa are abundant, well-known inhabitants of intertidal environments of the present-day Mediterranean (e.g. Norris and Crisp 1953;Davidae 1963;Ross 1964;Relini and Giordano 1969;Newman 1982;Zullo 1992;Herbert et al 2003). In general, the physical and biological processes controlling population dynamics presented in this paper appear to conform to those of present-day shore barnacles, allowing reasonable palaeobiological deductions about the formation of the dense barnacle concentrations in the Lower Pliocene deposits of basins of southeastern Spain.…”

Section: Introductionsupporting

confidence: 56%

Densely packed concentrations of sessile barnacles (Cirripedia: Sessilia) from the Early Pliocene of SE Spain

Aguirre

Martín

Braga

et al. 2008

Facies

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Sessile barnacle assemblages, dominated by Concavus concavus (Bronn) and Balanus perforatus Bruguière, are very abundant in the Lower Pliocene deposits of the Almería-Níjar and Carboneras basins (southeastern Spain). They occur in shallow-coastal siliciclastic and mixed siliciclastic-carbonate sediments, forming dense concentrations in two contexts: (1) sheltered shallowmarine depressions and (2) the mouth of distributary channels feeding a delta lobe. Extensive colonization took place during periods of quiescence with a high nutrient and food supply inducing the formation of hummocks. Crowding of high morphotypes was presumably triggered by a high larval supply and recruitment rate. The barnacles are exceptionally well preserved, often as in situ clusters, many with opercula, and include a range of ontogenetic stages with some specimens preserving original colouration. Good preservation is probably due to sudden burial without further reworking.

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“…When enough information for a reliable diagnosis was available an identification is proposed; otherwise only a provisional identification is attempted. The systematic taxonomy used for the classification mostly follows Buckeridge (1983), Zullo (1992) and Newman (1996).…”

Section: Methodsmentioning

confidence: 99%

Palaeoenvironmental analysis of the Miocene barnacle facies: case studies from Europe and South America

Coletti¹,

Bosio²,

Collareta³

et al. 2018

Geologica Carpathica

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Acorn barnacles are sessile crustaceans common in shallow-water settings, both in modern oceans and in the Miocene geological record. Barnacle-rich facies occur from polar to equatorial latitudes, generally associated with shallow-water, high-energy, hard substrates. The aim of this work is to investigate this type of facies by analysing, from the palaeontological, sedimentological and petrographical points of view, early Miocene examples from Northern Italy, Southern France and South-western Peru. Our results are then compared with the existing information on both modern and fossil barnacle-rich deposits. The studied facies can be divided into two groups. The first one consists of very shallow, nearshore assemblages where barnacles are associated with an abundant hard-substrate biota (e.g., barnamol). The second one includes a barnacle-coralline algae association, here named “barnalgal” (= barnacle / red algal dominated), related to a deeper setting. The same pattern occurs in the distribution of both fossil and recent barnacle facies. The majority of them are related to very shallow, high-energy, hard-substrate, a setting that represents the environmental optimum for the development of barnacle facies, but exceptions do occur. These atypical facies can be identified through a complete analysis of both the skeletal assemblage and the barnacle association, showing that barnacle palaeontology can be a powerful tool for palaeoenvironmental reconstruction.

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Revision of the Balanid Barnacle Genus Concavus Newman, 1982, with the Description of a New Subfamily, Two New Genera, and Eight New Species

Cited by 17 publications

References 6 publications

Comparative experimental taphonomy of eight marine arthropods indicates distinct differences in preservation potential

Comparative experimental taphonomy of eight marine arthropods indicates distinct differences in preservation potential

Densely packed concentrations of sessile barnacles (Cirripedia: Sessilia) from the Early Pliocene of SE Spain

Palaeoenvironmental analysis of the Miocene barnacle facies: case studies from Europe and South America

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