REDESCRIPTION OF SCALPELLOPSIS STRIATOCILIATA Broch, 1922, WITH A DISCUSSION ON ITS PHYLOGENETIC POSITION AND THE PEDUNCULAR PLATE PATTERN IN SCALPELLIDS

Young, Paulo S.

doi:10.1651/0278-0372(2001)021[0456:rossbw]2.0.co;2

Cited by 4 publications

(13 citation statements)

References 3 publications

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“…There is a consensus which extends back to the work of Withers (1928) that a number of features of Eolepas, Archaeolepas and stramentids are plesiomorphic among scalpellomorphs, most notably the small number of capitular plates (Archaeolepas, Eolepas, 6; carina, rostrum, 2 scuta, 2 terga; stramentids, 10; with upper laterals and carinolaterals) and the robust 8 columns of peduncular plates found in Archaeolepas and stramentids (Newman & Ross 1998;Young 2001). Indeed, most evolutionary scenarios place Eolepas at the base of the scalpellomorphs, and trace its origin back to the five-plated Carboniferous Praelepas (see Newman 1979Newman , 1987Fig.…”

Section: Polarity Determinationmentioning

confidence: 99%

Origin and phylogeny of the Cretaceous thoracican cirripede family Stramentidae

Gale

2015

Journal of Systematic Palaeontology

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A cladistic analysis of basal scalpellomorph cirripedes was undertaken in order to identify the phylogenetic position of the Stramentidae; this yielded a well-supported tree, in which the family is positioned crownwards of Archaeolepas, but basal to the families Scalpellidae and Zeugmatolepadidae. A new genus, Loriolepas, is described to accommodate some species previously referred to Archaeolepas. The basal scalpellomorphs display a remarkable change in shell mineralogy from calcium phosphate to calcium carbonate (Eolepas to Archaeolepas); the latter group is identified as a monophyletic clade, the Thoracicalcarea nov. A revised taxonomy of the predominantly Late Cretaceous cirripede family Stramentidae is presented. The Stramentidae are subdivided into two subfamilies, the Loriculinae nov., and the Stramentinae, based on characters of tergum, carinolatus and peduncular plates. The former subfamily includes Loriculina Dames, 1885,

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Section: Polarity Determinationmentioning

confidence: 99%

Origin and phylogeny of the Cretaceous thoracican cirripede family Stramentidae

Gale

2015

Journal of Systematic Palaeontology

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“…There has not always been clear distinction between the terms lateral plates (or latera), sublaterals, imbricating plates and peduncular scales, and considerable unresolved discussion has attended the identification of homologies between these structures. The significance of this discussion is considerable, ever since Darwin 1854 Lateral plates and peduncular scales, as seen for example in Capitulum, appear to be introduced at different positions, separated by a peduncular-lateral (P-L) line (Young 2001). New lateral plates are formed alternately on the outside of previously formed plates (Broch 1922), above this line, whereas peduncular scales appear above previously formed ones beneath this line.…”

Section: Peduncular Scales Imbricating Plates and Lateramentioning

confidence: 92%

“…3) and identified RL, CL, rl1 and l1. However, these plates are; 1) not differentiated morphologically from adjacent ones, and 2) new ones were formed at the contact with the rostrum and carina, exactly where peduncular scales form in scalpellomorphs (Young 2001;see below). We are therefore unable to support their interpretation as lateral plates.…”

Section: Plates Of the Primary Wallmentioning

confidence: 99%

“…The possibility that lateral plates were somehow "re-evolved" from the modified peduncular scales in Brachylepas would have to be based on the identification of homologies of peduncular plate columns present in scalpellomorphs with those in Brachylepas. The plesiomorphic condition in thoracican peduncular scales comprises 8 columns, introduced as two, alternating, sets -rl-cl, and sr -l -sc, seen in some scalpellids and all stramentids (Newman & Ross 1998;Young 2001). However, all thoracican taxa crownward of the scalpellids have numerous columns of peduncular scales (Pollicipeidae, Brachylepadidae) which are not homologous with those of the plesiomorphic pattern (Young 2001).…”

Section: Plates Of the Primary Wallmentioning

confidence: 99%

“…The plesiomorphic condition in thoracican peduncular scales comprises 8 columns, introduced as two, alternating, sets -rl-cl, and sr -l -sc, seen in some scalpellids and all stramentids (Newman & Ross 1998;Young 2001). However, all thoracican taxa crownward of the scalpellids have numerous columns of peduncular scales (Pollicipeidae, Brachylepadidae) which are not homologous with those of the plesiomorphic pattern (Young 2001). To simply presume that the three adjacent lateral columns set between the rostrum and carina represent rl, l and cl is not justified in our view.…”

Section: Plates Of the Primary Wallmentioning

confidence: 99%

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Origin of the balanomorph barnacles (Crustacea, Cirripedia, Thoracica): new evidence from the Late Cretaceous (Campanian) of Sweden

Gale

Sørensen

2014

Journal of Systematic Palaeontology

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New material of thoracican cirripedes, traditionally assigned to the Brachylepadomorpha and basal Balanomorpha, is described from abundant isolated plates collected from sediment deposited between boulders on a rocky coastline of Late Campanian age (c. 80 Ma) at Ivö Klack in Scania, southern Sweden. Two new genera, Epibrachylepas and Parabrachylepas (type species P. ifoensis Withers, 1935) are described, as is a new species, Epibrachylepas newmani. Pachydiadema cretacea Withers, 1935 and Brachylepas guascoi (Bosquet, 1857) are redescribed on the basis of extensive new material. It is concluded that the long-held homologies between lateral plates of pedunculate cirripedes and balanomorphs are incorrect, and a new nomenclature is proposed for the latter group. Cladistic analysis based on 40 morphological characters of 12 species yields a consensus tree showing successive Brachylepas species and Pachydiadema as sister taxa to the crown group balanomorphs, which are here called the Plesion Neobalanomorpha nov. Both the "Brachylepadomorpha" and the "Brachylepadidae" are paraphyletic, and together with P. cretacea, form a morphocline leading from pedunculate ancestors (Pycnolepas articulata), through to basal sessile forms (B. naissanti, B. guascoi) and on to taxa identified as basal balanomorphs (Parabrachylepas, Epibrachylepas, Pachydiadema). The functional significance of the progressive changes is discussed with reference to 2 living taxa. It is suggested that the radiation of the Neobalanomorpha, dominant shallow water thoracicans in the Cenozoic, postdated the K-Pg near-extinction of more basal sessile barnacle groups.

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Lepadiform and scalpelliform barnacles from the Oligocene and Miocene of the Paratethys sea

Harzhauser

Schlögl

2012

Palaeontology

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A review on the Oligocene and Miocene stalked barnacles of the Paratethys Sea is presented. The fauna comprises two lepadiform and eight scalpelliform species. Only two species are known from Oligocene deposits, four are documented from Lower Miocene formations, and another four species occur in the Middle Miocene. Only one Oligocene and one Miocene species occur in two different Paratethyan basins in roughly coeval environments, and only a single Middle Miocene species is also known from the adjacent Mediterranean Sea. This low degree of biogeographical similarity is probably a result from the still low number of publications dealing with this group. Stalked barnacles are often indicating bathyal or at least deep sublittoral environments. Especially, the abundance of the benthic deep-water lepadiform Poecilasma in evaporitic deposits of the Middle Miocene Badenian Salinity Crisis may serve as new evidence for a deeper marine depositional environment. Scalpellum paratethyianum sp. nov. and Lepas sattmanni sp. nov. are described as new species; Arcoscalpellum renevieri (Mayer and Gümbel in Gümbel, 1861) is introduced as new combination.

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REDESCRIPTION OF SCALPELLOPSIS STRIATOCILIATA Broch, 1922, WITH A DISCUSSION ON ITS PHYLOGENETIC POSITION AND THE PEDUNCULAR PLATE PATTERN IN SCALPELLIDS

Cited by 4 publications

References 3 publications

Origin and phylogeny of the Cretaceous thoracican cirripede family Stramentidae

Origin and phylogeny of the Cretaceous thoracican cirripede family Stramentidae

Origin of the balanomorph barnacles (Crustacea, Cirripedia, Thoracica): new evidence from the Late Cretaceous (Campanian) of Sweden

Lepadiform and scalpelliform barnacles from the Oligocene and Miocene of the Paratethys sea

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