The fasciolariid gastropod genus Benimakia: New species and a discussion of Indo-Pacific genera in Brazil

Vermeij, Geerat J.; Snyder, Martin Avery

doi:10.1635/0097-3157(2003)153[0015:tfggbn]2.0.co;2

Cited by 5 publications

(4 citation statements)

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“…1A, D), in this respect resembling Latirus (Vermeij and Snyder 2003) and Pustulatirus (Vermeij and Snyder 2006). Species included in Benimakia by Habe (1958) and Vermeij and Snyder (2003) occur in the western Pacific, with the exception of B. ogum, which putatively differs from other members of Peristerniinae related to Latirus in having a small labral tooth at the end of the basal cord. However, the presence of this tooth is questionable.…”

Section: Discussionmentioning

confidence: 86%

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Comparative anatomy of the fasciolariids Pustulatirus ogum and Hemipolygona beckyae from Brazil (Gastropoda: Buccinoidea: Peristerniinae)

Couto¹,

Simone²,

Pimenta³

2015

Sci. Mar.

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Summary:The Brazilian species Pustulatirus ogum and Hemipolygona beckyae were examined, and certain morphological characters were described. Both species were originally assigned to the genus Latirus, considered as a heterogeneous complex. The radulae of both species are like that which characterizes Latirus, in which the innermost cusp of the rachidian tooth is well developed but always smaller than the other cusps. This feature differs from Leucozonia, in which this cusp is reduced or absent. The penis tapers terminally, and the tapered part may be long (more than half the total penis length), as in H. beckyae, or very short (less than half the total penis length), as in P. ogum. The anatomical data observed in both species are discussed under the framework of fasciolariid systematics and they appear to be widespread among other fasciolariid species. For this reason, to date, the soft-part features here provided and those known from previously studied species of Latirus are not useful for delineating precise generic diagnoses.Keywords: morphology; Caenogastropoda; Fasciolariidae; Latirus; western Atlantic. Anatomía comparada de los fascioláridosPustulatirus ogum y Hemipolygona beckyae de Brasil (Gastropoda: Buccinoidea: Peristerniinae) Resumen: Se describe la morfología y anatomía de las especies brasileñas Pustulatirus ogum y Hemipolygona beckyae. Ambas especies han sido tradicionalmente asignadas al género Latirus, que en la actualidad se considera que agrupa a un conjunto heterogéneo de especies. Las rádulas de ambas especies son como la que caracteriza a Latirus, con la cúspide más interna del diente raquídeo bien desarrollada y siempre menor que las otras cúspides. Esta característica difiere de la que presentan las especies del género Leucozonia, en las que esta cúspide está reducida o ausente. El pene se estrecha en su parte terminal, y la parte cónica puede ser larga (más de la mitad de la longitud total del pene), como en H. beckyae, o muy corta (menos de la mitad de la longitud total del pene), como en P. ogum. Los caracteres morfológicos observados en ambas especies se discuten en el marco de la sistemática de los Fasciolariidae y parecen estar ampliamente distribuidos en otras especies de fascioláridos. Por ello, hasta la fecha, las características de las partes blandas del animal aquí descritas y las conocidas previamente de otras especies de Latirus no se consideran de utilidad para la diagnosis de los géneros en esta familia.

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Section: Discussionmentioning

confidence: 86%

“…Pustulatirus, Turrilatirus). Vermeij and Snyder (2003) transferred several species to the genus Benimakia Habe, 1958, includ-ing Benimakia ogum, originally described in Latirus. These authors characterized Benimakia as high-spired fasciolariids with prominent axial ribs and a labral tooth at the end of the central cord of the outer lip.…”

Section: Discussionmentioning

confidence: 99%

Comparative anatomy of the fasciolariids Pustulatirus ogum and Hemipolygona beckyae from Brazil (Gastropoda: Buccinoidea: Peristerniinae)

Couto¹,

Simone²,

Pimenta³

2015

Sci. Mar.

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“…The southern tip of South Africa is a well‐known biogeographical barrier for shallow‐water tropical/temperate taxa because of the Benguela cold‐water system, which became established during the late Miocene (Siesser, ; Marlow et al ., ; Teske et al ., ). Nevertheless, the fossil record and molecular phylogenetics studies have documented successful dispersal and speciation events from the IWP to the Atlantic around South Africa in shallow‐water taxa after the establishment of the Benguela current system during the Plio‐Pleistocene (Vermeij & Rosenberg, ; Vermeij & Snyder, ; Rocha et al ., ; Levy et al ., ). These dispersal events have been attributed to changes in climate associated with the Plio‐Pleistocene glacial–interglacial cycles, which prompted modifications in ocean currents and water temperature (Vermeij & Rosenberg, ; Rocha et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Speciation in the dark: diversification and biogeography of the deep‐sea gastropod genus Scaphander in the Atlantic Ocean

Eilertsen

Malaquias

2015

Journal of Biogeography

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AimThe aim of this work was to improve understanding about the mode, geography and tempo of diversification in deep‐sea organisms, using a time‐calibrated molecular phylogeny of the heterobranch gastropod genus Scaphander.LocationAtlantic and Indo‐West Pacific (IWP) oceans.MethodsTwo mitochondrial gene markers (COI and 16S) and one nuclear ribosomal gene (28S) from six Atlantic species of Scaphander, and four IWP species were used to generate a multilocus phylogenetic hypothesis using uncorrelated relaxed‐clock Bayesian methods implemented in beast and calibrated with the first occurrence of Scaphander in the fossil record (58.7–55.8 Ma).ResultsTwo main clades were supported: clade A, with sister relationships between species and subclades from the Atlantic and IWP; and clade B, with two western Atlantic sister species. Our estimates indicate that the two earliest divergences in clade A occurred between the middle Eocene and late Miocene and the most recent speciation occurred within the middle Miocene to Pleistocene. The divergence between the two western Atlantic species in clade B was estimated at late Oligocene–Pliocene.Main conclusionsThe prevailing mode of speciation in Scaphander was allopatric, but one possible case of sympatric speciation was detected between two western Atlantic species. Sister relationships between IWP and Atlantic lineages suggest the occurrence both of vicariance events caused by the closure of the Tethyan Seaway and of dispersal between the two ocean basins, probably around South Africa during episodic disruptions of the deep‐sea regional current system caused by glacial–interglacial cycles. Cladogenetic estimates do not support comparatively older diversification of deep‐sea faunas, but corroborate the hypothesis of a pulse of diversification centred in the Oligocene and Miocene epochs. Amphi‐Atlantic species were found to occur at deeper depths (bathyal–abyssal) and we hypothesize that trans‐Atlantic connectivity is maintained by dispersal between neighbouring reproductive populations inhabiting the abyssal sea floor and by dispersal across the shelf and slope of Arctic and sub‐Arctic regions.

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“…The link between the IO and SWA has been underappreciated in previous analyses (but see Vermeij & Snyder, 2003 for gastropod examples). The nine shared species are few in comparison to the total number of species in each area, but reveal a possible connection across the South Atlantic.…”

Section: Relationships Among Areas and Biogeographical Barriers/filtersmentioning

confidence: 93%

Atlantic reef fish biogeography and evolution

Floeter

Rocha

Robertson

et al. 2007

Journal of Biogeography

534

678

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Aim To understand why and when areas of endemism (provinces) of the tropical Atlantic Ocean were formed, how they relate to each other, and what processes have contributed to faunal enrichment.Location Atlantic Ocean.Methods The distributions of 2605 species of reef fishes were compiled for 25 areas of the Atlantic and southern Africa. Maximum-parsimony and distance analyses were employed to investigate biogeographical relationships among those areas. A collection of 26 phylogenies of various Atlantic reef fish taxa was used to assess patterns of origin and diversification relative to evolutionary scenarios based on spatio-temporal sequences of species splitting produced by geological and palaeoceanographic events. We present data on faunal (species and genera) richness, endemism patterns, diversity buildup (i.e. speciation processes), and evaluate the operation of the main biogeographical barriers and/or filters.Results Phylogenetic (proportion of sister species) and distributional (number of shared species) patterns are generally concordant with recognized biogeographical provinces in the Atlantic. The highly uneven distribution of species in certain genera appears to be related to their origin, with highest species richness in areas with the greatest phylogenetic depth. Diversity buildup in Atlantic reef fishes involved (1) diversification within each province, (2) isolation as a result of biogeographical barriers, and (3) stochastic accretion by means of dispersal between provinces. The timing of divergence events is not concordant among taxonomic groups. The three soft (non-terrestrial) inter-regional barriers (mid-Atlantic, Amazon, and Benguela) clearly act as 'filters' by restricting dispersal but at the same time allowing occasional crossings that apparently lead to the establishment of new populations and species. Fluctuations in the effectiveness of the filters, combined with ecological differences among provinces, apparently provide a mechanism for much of the recent diversification of reef fishes in the Atlantic.Main conclusions Our data set indicates that both historical events (e.g. Tethys closure) and relatively recent dispersal (with or without further speciation) have had a strong influence on Atlantic tropical marine biodiversity and have contributed to the biogeographical patterns we observe today; however, examples of the latter process outnumber those of the former.

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The fasciolariid gastropod genus Benimakia: New species and a discussion of Indo-Pacific genera in Brazil

Cited by 5 publications

References 7 publications

Comparative anatomy of the fasciolariids <em>Pustulatirus ogum</em> and <em>Hemipolygona beckyae</em> from Brazil (Gastropoda: Buccinoidea: Peristerniinae)

Comparative anatomy of the fasciolariids <em>Pustulatirus ogum</em> and <em>Hemipolygona beckyae</em> from Brazil (Gastropoda: Buccinoidea: Peristerniinae)

Speciation in the dark: diversification and biogeography of the deep‐sea gastropod genus Scaphander in the Atlantic Ocean

Atlantic reef fish biogeography and evolution

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