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352 results for “Thoracica”
FIGURE 12 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 12. Megabalanus coccopoma (Darwin, 1854) age and size dependent variations in tergum and scutum; a-d. ZUTCcirri 1179, with basal (rostro-carinal) diameter 16 mm; e-h. ZUTC-cirri 1181, with basal (rostro-carinal) diameter 30 mm; i-l. ZUTC-cirri 1181, with basal (rostro-carinal) diameter 46 mm.
FIGURE 6 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 6. Striatobalanus amaryllis (Darwin, 1854), a. scutum, external view; b. scutum, internal view; c. tergum, internal view; d. tergum, external view; e. scutum with strong striation, external view; f. a specimen on a mollusc shell, ZUTC-cirri 1175, Djod, Gulf of Oman, top view; g. a colony from an intertidal rock, ZUTC-cirri 1175, Djod, Gulf of Oman.
FIGURE 9 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 9. Amphibalanus venustus (Darwin, 1854), ZUTC- cirri 1161, Chabahar, Gulf of Oman; a. scutum, internal view; b. scutum, external view; c. tergum, internal view; d. tergum, external view; e, f. specimens from floating wood.
FIGURE 7 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 7. Amphibalanus amphitrite (Darwin, 1854); a–d. typical tergum and scutum from a conic shell, a. tergum, external view; b. tergum, internal view; c. scutum, external view; d. scutum, internal view; e–h. elongated tergum and scutum from a depressed shell; e. tergum, external view; f. tergum, internal view; g. scutum, external view; h. scutum, internal view; i–.l. tergum and scutum, from an exposed, eroded specimen; i. tergum, external view; j. tergum, internal view; k. scutum, external view; l. scutum, internal view; m. specimens on a floating object, ZUTC-cirri 1107, Minab, Strait of Hormuz; n. specimens on stone along with Microeuraphia permitini (Zevina & Litvinova, 1970) (brown small specimens), ZUTC-cirri 1102, Minab, Strait of Hormoz.
FIGURE 11. a–d in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 11. a–d: Megabalanus coccopoma (Darwin, 1854); a. scutum internal, view; b. scutum, external view; c. tergum, internal view; d. tergum, external view. e-h: Megabalanus occator (Darwin, 1854); e. scutum, internal view; f. scutum, external view; g. tergum, internal view; h. tergum, external view; i. Megabalanus occator, ZUTC-Cirri 1185, Chabahar, Gulf of Oman; j. Megabalanus coccopoma, ZUTC-cirri 1179, Chabahar, Gulf of Oman; k. Megabalanus coccopoma, ZUTC-cirri 1181, Chabahar, Gulf of Oman.
FIGURE 2. a. Ibla cumingi Darwin, 1852 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 2. a. Ibla cumingi Darwin, 1852, ZUTC-cirri 1290, Qeshm Island, Persian Gulf; lateral view; b. Conchoderma hunteri (Owen, 1830), ZUTC-cirri 1219, Chabahar, Gulf of Oman, lateral view; c. Lepas anserifera Linnaeus, 1767, ZUTC- Cirri 1154, Portuguese Castle, Chabahar, Gulf of Oman, lateral view; d. Lithotrya valentiana Reinhardt, 1850, ZUTC-cirri 1264, Chabahar, Gulf of Oman, lateral view; e. the same specimen, rostrum.
FIGURE 5 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 5. Armatobalanus allium (Darwin, 1854), ZUTC-Cirri 1186, Chabahar, Gulf of Oman: a. tergum, internal view; b. tergum, external view; c. scutum, internal view; d. scutum, external view; e. specimens on horny coral; f. oblique teeth on segments of cirrus III; g. labrum.
FIGURE 8 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 8. Amphibalanus subalbidus (Henry, 1973), ZUTC-Cirri 1187 from Arvand River; a. tergum, external view; b. tergum, internal view; c. scutum, internal view; d. scutum, external view; e. sheath with vesicles; f. segments of cirrus IV; g. labrum, h. specimens on stone.
FIGURE 10. Balanus trigonus Darwin, 1854 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 10. Balanus trigonus Darwin, 1854, ZUTC-cirri 1169, Chabahar, Gulf of Oman; a. scutum, internal view; b. scutum, external view; c. tergum, external view; d. tergum, internal view; e-g. specimens from floating objects, top view.
FIGURE 4. Tetraclita rufotincta Pilsbry, 1916 in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 4. Tetraclita rufotincta Pilsbry, 1916, ZUTC-cirri 1148, Bandar-Lengeh, Persian Gulf, a. scutum, internal view; b. scutum, external view; c. tergum, internal view; d. tergum, external view; e. side view of the shell; f. specimens on an intertidal rock in Parsian, Persian Gulf.
FIGURE 3. a in A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records
FIGURE 3. a. Platylepas hexastylos (Fabricius, 1794), ZUTC-cirri 1218, Gwatr, Gulf of Oman, dorsal view; b. Platylepas hexastylos, ventral view; c. Chelonibia testudinaria (Linnaeus, 1758), ZUTC- cirri 1144, Nayband, Persian Gulf, dorsal view; d. C. patula (Ranzani, 1818), ZUTC-cirri 1142, Minab, Strait of Hormoz, with polygonal orifice; dorsal view; e. C. patula, ZUTC- cirri 1144, from Bandar-Lengeh, Persian Gulf, with oval orifice, dorsal view; f. C. patula, from Dayyer, on crab Portunus segnis (Forskål, 1775).
FIGURE 1 in A review of the subfamily Eliminiinae (Cirripedia: Thoracica: Austrobalanidae), including a new genus, Protelminius nov., from the Oligocene of New Zealand
FIGURE 1. Distribution of the Elminiinae and early Tetraclitoidea. The earliest record of the Elminiinae is the four plated Protelminius pomahakensis from the Rupelian (early Oligocene) of New Zealand. Assuming a six-plated ancestor to this taxon, parsimony requires a Hexaminius-type first occurring in eastern Australia during the Eocene, from which the four-plated form evolved and dispersed across a proto-Tasman Sea to New Zealand. If Hexaminius had occurred in New Zealand, it would not be unreasonable to expect it in the present warmer northern waters. It was most likely during the Oligocene to early Miocene that Elminius dispersed to South America (shaded arrow); with colonization of the Falkland Islands and the eastern seaboard of South America being facilitated by the opening of the Drake Passage, which had occurred by that time (Scher and Morris, 2006). The dotted line shows the very recent distribution path for Austrominius modestus from Australasia to Europe; although there is a report of single specimen of A. modestus from South African waters – a 1949 record in Sandison (1950), there have been no further records from Africa since then, and we can only assume that it has failed to colonise in the area. Uncertainty about the high Austrominius diversity in a restricted region in South Australia necessitates that these taxa be grouped. A further arrow (dotted and shaded), extending from the Antarctic to what would have been the proto-Tasman Sea, delineates a possible westward dispersal route for the tetraclitoid genus Austrobalanus; which has the earliest records from the Bartonian (middle Eocene) of the Antarctic Peninsula (Buckeridge, 2000). Oceanic patterns at and immediately prior to that time (see Nelson and Cooke, 2001) provided an opportunity for Austrobalanus to have dispersed to southern New Zealand (where it is first recorded from the Rupelian (Oligocene). Extinct genera marked †.
FIGURE 4. Palaeogeographic Setting for the early Austrobalanidae. 4a in A review of the subfamily Eliminiinae (Cirripedia: Thoracica: Austrobalanidae), including a new genus, Protelminius nov., from the Oligocene of New Zealand
FIGURE 4. Palaeogeographic Setting for the early Austrobalanidae. 4a: Sketch depicting the oceanic systems that are likely to have operated in the south Pacific region during the late Palaeocene-early Eocene. At this time, the Antarctic continent was kept essentially ice-free by a large south Pacific warm-water gyre; counter-currents operating off Antarctic provided an opportunity for westward dispersal of Austrobalanus (to the McMurdo region and the proto-New Zealand land mass "NZ"). The dashed line represents a likely mobile transitional zone between marine regression and transgression. 4b: Southern ocean conditions during the Oligocene to early Miocene, after the initiation of the Antarctic Circumpolar Current. With the loss of the southern pacific warm-water gyre, glaciation of the Antarctic continent began (e.g. Kennett, 1977), with the resultant regional extinction of austrobalanid barnacles. The heavier dotted blue line represents the likely position of the cold and temperate water systems convergence. (Reconstruction adapted from Markwick et al., 1999; Barron and Peterson, 1991; Nelson and Cooke, 2001).
FIGURE 3 in A review of the subfamily Eliminiinae (Cirripedia: Thoracica: Austrobalanidae), including a new genus, Protelminius nov., from the Oligocene of New Zealand
FIGURE 3. Sessilia divergence time chronogram. Nodes determined on the basis of the fossil record (figures in nonitalics in MYBP) and molecular and morphological data (figures in italics; after Pérez-Losada et al., 2007). The lack of fossil evidence for sessilian barnacles prior to the Cretaceous boundary is compelling, especially as there is a very diverse and widespread record of Cretaceous scalpelliformes (Newman and Ross, 1976; Buckeridge, 1996). We adopt a parsimonious approach to this, concluding that the Sessilia evolved very quickly during the period following the Cretaceous-Tertiary extinction event, such that all major balanomorph taxa had appeared between the early Palaeocene and the late Eocene. This is a much tighter timeframe than envisaged by Pérez-Losada et al., 2008.
FIGURE 3 in Two new species and a new subspecies of Tetraclitella (Cirripedia: Thoracica) from the Cainozoic of Australia and New Zealand and a consideration of the significance of tubiferous walls
FIGURE 3. Tetraclitella judiciae sp. nov. P313914 (holotype)–shell with opercular valves absent (the opercular opening is the large central quadrangular structure); carina at top. The dark, "round" cavity (c. 1.0 mm in diameter) to right of the opercular opening is an eroded radius, and it is here where the recrystallized shell fabric is suggestive of having had radial pores.
FIGURE 2 in Two new species and a new subspecies of Tetraclitella (Cirripedia: Thoracica) from the Cainozoic of Australia and New Zealand and a consideration of the significance of tubiferous walls
FIGURE 2. Tetraclitella nodicostata sp. nov. A: A177 (holotype)–latus, showing prominent, nodular longitudinal ribbing and narrow radius (exterior); B: A177–latus, showing weakly developed sheath and honeycomb like parietal pores (interior). Specimen has been coated with polyvinyl acetate to prevent disintegration.
FIGURE 1. Tetraclitella spp. A–E in Two new species and a new subspecies of Tetraclitella (Cirripedia: Thoracica) from the Cainozoic of Australia and New Zealand and a consideration of the significance of tubiferous walls
FIGURE 1. Tetraclitella spp. A–E: Tetraclitella judiciae sp. nov. A: RM 318–latus (exterior); B: RM 318–latus (interior), the central, large, ellipsoidal structure is a grain of calcite, that if removed may have damaged the plate. It is not part of the barnacle; C: P313914–detail showing eroded radius of left latus (central cavity on image), and ellipsoidal pattern produced by eroded parietal pores intersecting the exterior surface; D: P313914–detail showing basal section through the shell wall, with inner row of large, elongate pores and outer multi-porous zone; E: P313914–detail showing parietal pores that have been apically infilled; F: Tetraclitella purpurascens purpurascens (Wood, 1815): Basal view of parietes exposing edge of sheath (upper, unpatterned zone) and multi-porous zone that lacks a distinct inner row or larger, elongate pores.
FIGURE 39 in Descriptions of four new sponge-inhabiting barnacles (Thoracica: Archaeobalanidae: Acastinae)
FIGURE 39. The best scoring maximum-likelihood (ML) tree based on concatenated 12S and cytochrome c oxidase subunit I (COI) datasets. Node labels are supporting values (%) estimated from the neighbor-joining (NJ), maximum-parsimony (MP), and ML methods, respectively. Only the nodes with ±70% support values for all 3 methods are listed. Scale bars indicate the number of expected substitutions per site.
FIGURE 38 in Descriptions of four new sponge-inhabiting barnacles (Thoracica: Archaeobalanidae: Acastinae)
FIGURE 38. Acasta undulaterga sp. nov. Mandible (A̅C), mandibular palp (D̅G) and labrum (H, I) (Holotype). A, mandible; B, inferior angle; C, upper part; D mandibular palp; E, outer margin; F, basal part; G, serrulate setae on distal lobe; H, labrum; I, teeth on crests. Scale bars in µm.
FIGURE 37 in Descriptions of four new sponge-inhabiting barnacles (Thoracica: Archaeobalanidae: Acastinae)
FIGURE 37. Acasta undulaterga sp. nov. Maxillae (A̅D) and maxillule (E̅H) (Holotype). A, maxillae; B, terminal parts of maxillae; C, outer edge; D, basal part; E, maxillule; F, straight cutting edge showing 8 cuspidate setae; G, upper half of cutting edge; H, lower half of cutting edge. Scale bars in µm.
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