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14 results for “Megabalanus”
Data from: Phylogeography of a marine insular endemic in the Atlantic Macaronesia: the Azorean barnacle, Megabalanus azoricus (Pilsbry, 1916)
The Azorean barnacle, Megabalanus azoricus (Pilsbry, 1916), is a Macaronesian endemic whose obscure taxonomy and the unknown relationships among forms inhabiting isolated Northern Atlantic oceanic islands is investigated by means of molecular analysis herein. Mitochondrial data from the 16S rRNA and COX1 genes support its current species status, tropical ancestry, and the taxonomic homogeneity throughout its distribution range. In contrast, at the intraspecific level and based on control region sequences, we detected an overall low level of genetic diversity and three divergent lineages. The haplogroups α and γ were sampled in the Azores, Madeira, Canary, and Cabo Verde archipelagos; whereas haplogroup β was absent from Cabo Verde. Consequently, population analysis suggested a differentiation of the Cabo Verde population with respect to the genetically homogenous northern archipelagos generated by current oceanographic barriers. Furthermore, haplogroup α, β, and γ demographic expansions occurred during the interglacial periods MIS5 (130 Kya - thousands years ago -), MIS3 (60 Kya), and MIS7 (240 Kya), respectively. The evolutionary origin of these lineages is related to its survival in the stable southern refugia and its demographic expansion dynamics are associated with the glacial-interglacial cycles. This phylogeographic pattern suggests the occurrence of genetic discontinuity informative to the delimitation of an informally defined biogeographic entity, Macaronesia, and its generation by processes that delineate genetic diversity of marine taxa in this area.
FIGURE 11 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 11. Maximum Likelihood-based molecular phylogenetic analysis of Megabalanus species using a Cytochrome Oxidase I gene fragment (426bp) obtained from GenBank and two sequenced specimens from Curaçao (MNRJ25256 / KX538961, MNRJ25257 / KX538962). Bootstrap values below nodes and number of sequences in brackets. GenBank accession numbers are listed in Appendix II.
FIGURE 12 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 12. Reported localities of Megabalanus zebra based on available literature and the present work. Only reports from non-mobile substrate or those with a confidence that belongs to a local population.
FIGURE 10 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 10. Morphometric analysis of scutum inner face. A, scatterplot of the canonical variate scores of relative warps among Megabalanus zebra (Darwin, 1854) (orange x), Megabalanus coccopoma (Darwin, 1854) (green circle) and Megabalanus tintinnabulum (Linnaeus, 1758) (red star); B, thin-plate spline deformation grid of CVA1; and C, box-plot of ratio between scutum basal margin / tergal margin (n=13), with a sample image of each species analyzed.
FIGURE 9 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 9. Morphometric analysis of tergum inner face. A, scatterplot of the canonical variate scores of relative warps among Megabalanus zebra (Darwin, 1854) (orange x), Megabalanus coccopoma (Darwin, 1854) (green circle) and Megabalanus tintinnabulum (Linnaeus, 1758) (red star); B, thin-plate spline deformation grid of CVA1; and C, box-plot of ratio between tergum basal margin segment, scutal side / spur width ratio (n=13), with a sample image of each species analyzed.
FIGURE 8 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 8. Megabalanus zebra (Darwin, 1854) oral appendages from three specimens collected in Chaguaramas, Trinidad. A, labrum; B, detail of labrum (A); C, palp; D, mandible; E, detail of second tooth of mandible (D); F, mandible; G, detail of distal margin of palp (C); H, maxilla I; I, detail of maxilla (H) upper angle; J, detail of mandible (F) showing the 4th and 5th tooth and lower angle; K, maxilla II. A, B and K represent specimen MNRJ 25249; C and G, MNRJ 25245; D and E MNRJ 25255; F, H, I and J, MNRJ 25247. Scale bar = 0.5 mm.
FIGURE 4 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 4. Megabalanus zebra (Darwin, 1854) right parietal plates from a specimen collected from the Progression hull at Chaguaramas, Trinidad (MNRJ 25247). A, external view; B, internal view. al = alae; sh = sheath; rd = radius; c = carina; cl1 = carinolatus 1; cl2 = carinolatus 2. Scale bar = 5 mm.
FIGURE 2 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 2. Specimens of Megabalanus zebra (Darwin, 1854) collected on boat hulls sampled in Trinidad. A and C, specimen from Progression (MNRJ 25244), left lateral and upper view respectively; B, specimens attached to Lepas anatifera (Linnaeus, 1758), collected from Ƒiking IƑ (MNRJ 25258); D, two specimens of M. zebra attached to Amphibalanus amphitrite (Darwin, 1854) from Alcazar; left (MNRJ 25255), right (MNRJ 25254). Scale bar: A, C and D = 0.5 cm; B = 1 cm.
FIGURE 3 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 3. Size structure based on shell basal length of Megabalanus zebra (Darwin, 1854) from specimens sampled in Trinidad and Curaçao (n=41). Three broken shells were not included.
FIGURE 6 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 6. Two specimens of Megabalanus zebra (Darwin, 1854) from a pier piling at Piscadero Harbor, Curaçao. A–F, MNRJ 25256; G–L, MNRJ 25257. A, shell top view; B, shell left lateral view; G and H, outer and inner view of right parietal plates, respectively; C, I and D, J, right scutum outer and inner faces; E, K and F, L, right tergum inner and outer faces. Scale bar: A and B = 1 cm, C- F = 6.5 mm; G, H = 0.7 mm; I-L = 5mm.
FIGURE 1 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 1. Landmark positions and names of scutum and tergum. Megabalanus zebra from Ƒiking IV hull, Chaguaramas, Trinidad (MNRJ 25251). A, inner face of right tergum; B, inner face of left scutum.
FIGURE 5 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 5. Left opercular plates of Megabalanus zebra (Darwin, 1854) (MNRJ 25254) collected from Alcazar at Chaguaramas, Trinidad. A and B, scutum inner and outer face; C and D, tergum inner and outer face. Scale bar = 1 mm.
FIGURE 7 in A Cryptic Invasion in the Western Atlantic: Presence of the Fouling Barnacle Megabalanus zebra (Darwin, 1854) (Crustacea, Cirripedia) in the Caribbean Sea
FIGURE 7. Megabalanus zebra (Darwin, 1854) cirri from three specimens collected from boat hulls at Chaguaramas, Trinidad. A, cirrus I; B, cirrus II; C, cirrus III; D, cirrus VI; E, F and G, detail of external side of outer rami median segments of cirrus III, IV and VI, respectively. Figures A, B, E, F and G from specimen MNRJ 25245; C and E from MNRH 25248; D from MNRJ 25255. Scale bar: A, B and C = 2 mm; D = 4 mm; E, F and G = 1 mm.
Data from: Phylogeography of a marine insular endemic in the Atlantic Macaronesia: the Azorean barnacle, Megabalanus azoricus (Pilsbry, 1916)
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