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129 results for “benthic species”
Species richness and abundance of benthic infauna found in lagoons along the Beaufort Sea Coast, 2018-ongoing
Quantitative benthic invertebrate surveys can be used to characterize and compare benthic community structure of nearshore Arctic lagoon systems. The Beaufort Lagoon Ecosystems Long Term Ecological Research (BLE LTER) Core Program employs spatial sampling to compare benthic community structure among lagoon systems along the Alaskan Beaufort Sea coast and temporal sampling to track benthic community structure across the three major seasons of the Arctic (ice cover, break up, and open water). Ponar grabs, hollow-core drills (SIPRE corer), and 0.5 mm sieves are employed to quantitatively sample meiobenthic and macrobenthic communities during all three Arctic seasons. All invertebrate specimens are identified to the lowest taxonomic level possible, preserved in 100% ethanol, and enumerated. Wet weights in ethanol are also recorded.
Climate-associated variation in the drivers of benthic macroinvertebrate species-area relationships across shallow freshwater lakes
<p><span>The island species-area relationship (ISAR) describes how species richness increases with increasing area of a given island or island-like habitat, such as freshwater lakes. </span><span>While the ISAR is one of the most common phenomena observed in ecology, there is variation in both the form of the relationship and its underlying mechanisms.</span></p> <p><span>We compiled a global dataset of benthic macroinvertebrates from 524 shallow freshwater lakes, ranging from 1 to 293300 ha in area. We used individual-based rarefaction to determine the degree to which ISAR was influenced by mechanisms other than passive sampling (larger islands passively sample more individuals from the regional pool and, therefore, have more species than smaller islands), which would bias results away from expected relationships between rarefied species richness (and other measures that capture relative abundances) and lake area. We also examined how climate may alter the shape of the ISARs. </span></p> <p><span>We found that both rarefied species richness (the number of species standardized by area or number of individuals) and a measure of evenness emphasizing common species exhibit non-significant relationships with lake area, suggesting that the expected ISARs in these lakes most likely result from passive sampling. </span><span>While there was considerable variation among ISARs across the investigated lakes, we found an overall positive rarefied ISAR for lakes in warm (i.e., tropical/subtropical) regions (n = 195), and in contrast, an overall negative rarefied ISAR in cool (i.e., north temperate) lakes (n = 329). This suggested that mechanisms beyond passive sampling (e.g., colonization-extinction dynamics and/or heterogeneity) were more likely to operate in warm lakes. One possible reason for this difference is that the area-dependent intensity of fish predation, which can lead to flatter ISARs, is weaker in warmer relative to cooler lakes.</span></p> <p><span>Our study illustrates the importance of understanding both the pattern and potential processes underlying the ISARs of freshwater lakes in different climatic regions. Further, it provides a baseline for understanding how further changes to the ecosystem (i.e., in lake area or climate) might influence biodiversity patterns. </span></p>
Benthic Species Araçá Bay_Checklist
<p><span>Supporting data of the article: AMARAL, A.C.Z., CUNHA, B.P., CHECON, H.H., GODOY, A.S. et al. <strong>The high biodiversity of benthic organisms in a coastal ecosystem revealed by an integrative approach</strong>. Biota Neotropica 24(2): e20231583. <span><a href="https://doi.org/10.1590/1676-0611-BN-2023-1583"><span>https://doi.org/10.1590/1676-0611-BN-2023-1583</span></a></span> </span></p>
Text-fig. 6. Correlation of the Cheringoma and Mazamba formations on the basis of benthic foraminiferans and mammals respectively. Identifications of foraminiferans are from Newton (1924) and Abrard (1928), and the ranges of foraminiferans are from Sella-Kiel et al. (1998). The time scale is from Gradstein et al. (2020). The distribution of Nummulites atacicus is included, but it is not known whether it is reworked from older deposits. If the identification is valid, it would support the thesis that there was a period of Ypresian deposition in the vicinity during which remains of the species were fossilised. in Stratigraphy, Chronology And Palaeontology Of The Tertiary Rocks Of The Cheringoma Plateau, Mozambique
Text-fig. 6. Correlation of the Cheringoma and Mazamba formations on the basis of benthic foraminiferans and mammals respectively. Identifications of foraminiferans are from Newton (1924) and Abrard (1928), and the ranges of foraminiferans are from Sella-Kiel et al. (1998). The time scale is from Gradstein et al. (2020). The distribution of Nummulites atacicus is included, but it is not known whether it is reworked from older deposits. If the identification is valid, it would support the thesis that there was a period of Ypresian deposition in the vicinity during which remains of the species were fossilised.
Figures 139–149. Figs 139–143 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 139–149. Figs 139–143. Rhoicosigma compactum (GU52N-7). Fig. 139. Three views of a live cell in different orientations (DIC). Figs 140, 141. Acid-cleaned valves showing the two contrasting raphe paths: convex valve nearly straight raphe, concave valve highly sigmoid (DIC). Fig. 142. External detail, convex valve, showing overlapping central raphe endings and pattern of striae (SEM). Fig. 143. Internal surface of concave valve. Figs 144, 145. Seminavis robusta, DIC (GU52Q-1a) and SEM (GU52Q-10a). Figs 146–149. Surirella cf. fastuosa. Fig. 146. Live cell show lobed plastid (GU66C-7). Fig. 147. Valve in DIC (GU44AQ-3) (two stacked images). Figs 148, 149. External and internal views of valve (GU66A-1, GU66A-2) (SEM). Scale bars: Figs 139–141, 143–149 = 10 µm, Figs 142 = 5 µm.
Figures 127–138. Figs 125–126 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 127–138. Figs 125–126. Psammodictyon pustulatum (GU66A-3) (SEM). Fig. 127. Oblique view of frustule showing linear pores on the dorsal valve face (arrow). In both Figs 127 and 128 the transition from the ventral to dorsal parts of the valvocopula is visible (arrowheads). Fig. 128. Apical view of frustule showing the distinctive topography of the ventral side of the raphe-keel, along with the linear pores on the dorsal side of the other valve (arrow) (two stacked images). Figs 129, 130. Pteroncola inane (SEM). Fig. 129. Frustule in girdle view (GU41D-1A). Fig. 130. Broken frustule showing internal and external valve faces, with the single row of internal pores (arrows) (Jordan collection, image by Misaki Ishizawa) (SEM). Figs. 131–138. Rhoiconeis pagoensis. Figs 131, 132. Same live cell in valve and girdle view showing plastids (GU7X-8) (DIC). Figs 133, 134. Holotype (valve view) and a girdle view from the same slide (GU7X-7) (DIC). Fig. 135. Frustule in valve view (GU7X-7) (SEM). Fig. 136. Frustule in girdle view; note the very short striae at the central area on the concave valve (GU7X-2) (SEM). Fig. 137. Detail of a pair of frustules showing difference in striae lengths at central area on convex and concave valves (GU7X-2) (SEM). Fig. 138. Apex of a frustule in girdle view showing the segmented valvocopula (S1 and S2) and two pleural bands (P1 and P2) (GU7X-5) (SEM). Scale bars: Fig. 136 = 10 µm, Figs 127–128, 131–135 = 5 µm, Figs 129, 130, 137, 138 = 2 µm.
Figures 107–113 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 107–113. Pogoneis bahrainii. (GU44I-4) (SEM, except Fig. 107 DIC). Fig 107. Frustules in valve and girdle views. Fig. 108. Frustule in girdle view. Fig 109. SV, external view. Fig. 110. Detail of central area of RV. Fig. 111. Detail of apex of RV, showing the thickened "prow." Fig. 112. RV, internal view showing silica plate bordering the raphe and extending into interstrial costae. Fig 113. RV, detail of internal view showing apex. Scale bars: 107 = 10 µm; 108–113 = 1 µm.
Figures 114–126. Figs 114–117. Protokeelia cholnokyi. Fig. 114 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 114–126. Figs 114–117. Protokeelia cholnokyi. Fig. 114. Valve in LM (GU44I-1) (DIC). Fig. 115. External view of valve (GU44J-2 / ECT3569), SEM; image courtesy of Elizabeth Ruck. Fig. 116. Internal view of valve (GU44Z-15) (SEM). Fig. 117. External, dorsal view of whole frustule showing girdle bands and dorsal faces of valves (SEM); courtesy of Elizabeth Ruck. Figs 118–126. Psammodictyon pustulatum. Figs 118, 119. Frustule at two focal planes (GU66F-7A) (DIC). Fig. 120. Valve from GU66A-3 (DIC). Fig. 121. Specimen from Nagasaki on Meister's slide 3509092. Fig. 122. Valve from Hustedt collection, slide W1/18, specimen from Vera Cruz, Mexico, image courtesy of Friedel Hinz. Fig. 123. External view of valve face (GU52Q-10a) (SEM). Fig. 124. Internal view of valve and part of the valvocopula. Arrows indicate where the valvocopula is broken. Inset shows full-resolution detail of valve margin and valvocopula, with the row of pores on the latter. Fig. 125. Frustule in oblique view showing the valves and girdle components. The ventral part of the valvocopula (vc) of the epivalve (ev) is visible at the front, and at the back the distal part of the valvocopula for the hypovalve (hv). Arrow indicates row of pores on the first pleura (p). Fig. 126. External detail of valve, showing the loculate character; arrow indicates row of pores on valvocopula. Scale bars: Figs 114–117, 123, 124 = 5 µm, Figs 118–122 = 10 µm, Figs 125, 126 = 2 µm.
Figures 98–106. Figs 98–105 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 98–106. Figs 98–105. Pinnunavis yarrensis (GU69A-1). Fig. 98. Live cell showing plastid lobes below the valve surface (DIC). Figs 99–101. Three valves of different sizes (DIC). Fig. 102. Detail of areolae and central area, external (SEM). Fig. 103. Detail of girdle view showing valvocopula with single row of pores (SEM). Fig. 104. Fragment of apex, broken along the raphe slit, showing helictoglossa and thickened interstriae (SEM). Fig. Detail of valvocopula showing fluted margin of the pars interior (SEM). Fig. 106. Plagiogramma atomus, external valve view (GU44L-E) (SEM). Scale bars: Fig 98–101 = 10 µm, Figs 102–106 = 5 µm.
Figures 87–97. Figs 87, 88 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 87–97. Figs 87, 88. Nitzschia janischii whole mount, details of central nodule and apex (GU44Z-15) (SEM). Figs 89–94. Nitzschia nienhuisii. Figs 89, 90. Girdle and valve views of the same cell in a wet mount (DIC). Figs 91, 92. Girdle and valve views of frustules in permanent mounts (GU44R-1, GU52P-1) (phase contrast). Figs 93, 94. Whole mount in SEM, and detail of central raphe endings (GU7R). Figs 95–97. Petroneis humerosa (GU44I-3). Fig. 95. Valve (DIC). Fig. 96. External view of valve (SEM). Fig. 97. Internal detail (SEM). Scale bars: Figs 87–93, 95, 96 = 10 µm, Fig. 94 = 2 µm, Fig. 97 = 5 µm.
Figures 72–86. Fig. 72 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 72–86. Fig. 72. Mastogloia pumila. Frustule showing two internal valve faces and valvocopulae; notice the variation in number of partecta (GU52P-1) (SEM). Figs 73–79. Mastogloia quinquecostata. Fig. 73. Live cell showing plastids (GU66A-5) (DIC). Figs 74–76. Frustule at three focal planes showing conopeum, areola pattern of valve face, and partecta (GU52Q-10a) (DIC). Figs 77, 78. Specimen at two focal planes showing the join in the conopeum (arrow) (GU44I-1) (DIC). Fig. 79. Oblique external view of valve showing seam along the conopeum (arrow) (GU66F-8) (SEM). Figs 80–82. Mastogloia seychellensis (GU52Q-10a). Figs 80, 81. Specimen at two focal planes, the valvocopula showing diagonal partectal ducts (DIC). Fig. 82. External view of valve (SEM). Figs 83–86. Nitzschia janischii. Fig. 83. Live cell in girdle view, showing nucleus (arrow) and plastids with pyrenoids (GU44AR-2) (DIC). Fig. 84. Portion of valve (GU44Z-15) (DIC). Figs 85, 86. Internal details of apex and central area, respectively, the latter showing the central nodule (arrow) (GU44AR-2) (SEM). Scale bars: Figs 73–78, 80–84 = 10 µm, Figs 72, 79, 85, 86 = 5 µm.
Figures 51–70. Figs. 51–55. Mastogloia emarginata. Figs 51-54 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 51–70. Figs. 51–55. Mastogloia emarginata. Figs 51-54. LM views of two specimens focused on valve face and valvocopula, arrowhead indicates one of the prominent exit pores of the partecta (GU44AR-2) (DIC). Fig. 55. Internal view of valve and valvocopula (GU55B-4) (SEM). Figs 56, 57. Mastogloia ovulum specimen at two focal planes (GU44K-6) (DIC). Figs 58-61. Mastogloia matthaei, two specimens at two focal planes (GU52P-2) (DIC). Figs. 62, 63. Mastogloia obliqua, valve at two focal planes (GU66F-4) (DIC). Figs. 64–67. Mastogloia peracuta (GU44AP-9). Figs 64, 65. Specimen at two focal planes (DIC). Figs 65, 66, External views of two specimens in SEM. Figs 68–71. Mastogloia pumila. Figs 68, 69. Specimen in DIC at two focal planes (GU52P-1; catalog # GUD002950). Fig. 70. Internal aspect of valve and valvocopula (GU52P-9) (SEM). Fig. 71. Frustule showing both internal and external valve faces. Scale bars: Figs 51–69 = 5 µm, Figs 70, 71 = 3 µm.
Figures 22–40. Figs 22–26 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 22–40. Figs 22–26. Cocconeis ornata, two valves at two focal planes each in DIC and external view in SEM (GU44AU-2). Figs 27–32. Cocconeis subtilissima. Figs 27, 28. Frustules in LM (GU44I-2, GU44Z-15) (DIC). Figs 29, 30. RV external and internal with valvocopula (GU44AQ-1). Figs 31, 32. SV external (whole mount, GU44AC-4), showing the alveolae at the fracture (arrow), and internal (GU44AQ-1). Figs 33–40. Colliculoamphora gabgabensis. Fig. 33. Holotype specimen (GU44AK-6) (DIC). Fig. 34. Paratype specimen (GU44I-1) (DIC). Fig. 35. Specimen showing deeper indentation (GU44AK-6). Figs 36–38. External views, showing the eunotid position of the raphe; arrows on Fig. 37 indicate short striae; Fig. 38 shows girdle bands (GU44AK-6, GU44Z-15, GU52Q-10a, respectively) (SEM). Figs 39, 40. Internal views (GU44W10, GU44K-6) (SEM). Scale bars: Figs 22–36 = 5 µm, Figs 37, 38 = 2.5 µm, Figs 39, 40 = 2 µm.
Figures 41–50. Figs 41, 42 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 41–50. Figs 41, 42. Hemidiscus cuneiformis var. ventricosa (GU66F-4) (DIC). Fig. 41. Valve view; arrow points to pseudonodulus. Fig. 42. Oblique view with focus on several of the rimoportulae (arrow). Figs 43–48. Lauderia excentrica. Fig. 43. Holotype specimen (GU44I-1) (DIC). Fig. 44. External view of valve showing excentric, reniform annulus and external rimoportula opening (arrow) (GU44Y-13) (SEM). Fig. 45. External detail of annulus (GU55B-4) (SEM). Fig. 46. Internal view of valve with rimoportula (arrow), also showing the external aspect of the fultoportulae along the bottom rim (GY44Y-13) (SEM). Figs 47, 48. External and internal details of striae and fultoportulae, showing 5 satellite pores in the central fultoportulae (arrowhead) and 2-4 in the striae (arrow) (GU44Y-13) (SEM). Figs 49, 50. Mastogloia affirmata valve and valvocopula at two focal planes (GU44AX-1) (DIC). Scale bars: Figs 41, 42, 49, 50 = 10 µm, Figs 43, 44, 46 = 5 µm, Figs 45, 47, 48 = 2 µm.
Figures 16–21. Figs 16, 17 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 16–21. Figs 16, 17. Comparison of frustules of Campylodiscus fastuosa (Fig. 16) and Surirella scalaris (Fig. 17) showing crossed orientation of valves in the former versus parallel orientation in the latter. (GU66F-7A, GU52P-5, respectively) (SEM). Fig. 18. Frustule of C. fastuosa (GU66F-7A) (SEM). Figs 19, 20. C. fastuosa internal valves faces of small and large cells (GU66F-7A) (SEM). Fig. 21. Cocconeis dapalistriata, sternum valve (GU44AU-2) (SEM). Scale bars = 5 µm.
Figs 1–6 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figs 1–6. Amphora rhombica var. intermedia (GU43C). Figs 1, 2. Valve with curved raphe at two focal planes (DIC). Figs. 3, 4. Valve with nearly straight raphe at two focal planes (DIC). Fig. 5. Internal view of valve showing conopeum over central raphe endings (SEM). Fig. 6. External ventral view of valve showing girdle bands and conopeum over the central raphe endings. Fig. 7. Asteromphalus cleveanus (GU52N-4) (DIC). Figs 8, 9. Asteromphalus hepactis internal view and detail (GU56A) (SEM). Scale bars: Figs 1–4, 6–8 = 10 µm, Figs 5, 9 = 5 µm.
Figures 10–12. Auricula flabelliformis. Figs 10, 11 in Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis)
Figures 10–12. Auricula flabelliformis. Figs 10, 11. LM and SEM images of specimens from Yap (Y26B) (DIC) and Guam (GU66A-2) (SEM). Only half of each image is shown so that the delicate striation is visible. Fig. 12. Detail of internal valve face showing very short ventral surface and flabelliform striation (GU66A-2) (SEM). Fig. 13. C. fastuosus large valve (GU66F-8, catalog # GUD002914) (DIC). Figs 14, 15. C. fastuosus small valve (Fig. 14) compared to S. scalaris (GU52Q-2, GU52Q-10b respectively) (DIC). Scale bars: Figs 10, 11, 13–15 = 10 µm, Fig. 12 = 5 µm.
Fig. 3 in Dictyoconella Henson, 1948, Upper Cretaceous Larger Benthic Foraminifera: A Taxonomic Revision With The Establishment Of Gusicella Gen. Nov. (Type-Species Dictyoconella Minima Henson)
Fig. 3 Dictyoconella complanata Henson from the Maastrichtian of Qatar (a-b) and Iran (c-e). a, isolated specimen, holotype (from Henson, 1948, pl. 6, fig. 2). Section planes 1-----1' and 2-----2' refer to b and d respectively. b, transverse section parallel to the median plane (from Henson, 1948, pl. 6, fig. 3, parataype). c, slightly oblique median section. Note the inclination of the chambers towards the apex. Thin section 2Ng 83. d-e, slightly oblique subaxial sections, perpendicular to the median plane (s = septum, f = foramen). Thin sections 2Ng 81, 2Ng 80-5. deuteroconch, eccentric position with twisted apex. Mi- Larger Benthic Foraminifera associated with dasycladale- crospheric embryo not discernible within a close-coiled an algae (Fig. 2). Gusicella minima occurs more common whorl. Adult chambers arched and rectilinear. Exoskelein the lower part of the Tarbur Fm. associated with Om- ton with several orders of horizontal and vertical partiphalocyclus and Loftusia (Wynd, 1965: Omphalocyclu- tions forming a delicate subepidermal network. The marclus-Loftusia assemblage zone), and other taxa such as ginal zone is separated from the central zone by a mar- Gyroconulina columelliforma Schroeder & Darmoian ginal trough. Central zone with pillars alternating be- (Fig. 2c-d). D. complanata is restricted to the upper part tween subsequent chambers. Foramina multiple in the of the Tarbur Formation in a more inner platform setting central zone and with straight arrangement between (compared to the occurrence of G. minima). Here it is chambers; marginal foramina are present. Wall finely associated with taxa such as Loftusia div. sp., Dicyclina agglutinated, thin, consisting of an epiderm and a delicate schlumbergeri Munier-Chalmas, Tarburina zagrosiana sub-epidermal cellular layer. Schlagintweit & Rashidi and Pseudonummoloculina Comparisons: Morphologically, Dictyoconella is unique kalantarii Schlagintweit & Rashidi (Fig. 2a-b). among all other Orbitolinidae due to its strongly compressed (flattened) test. This makes a detailed comparison SYSTEMATICS to the other Upper Cretaceous genera of the Orbitolinidae superfluous. Douglass (1960, p. 256) stated that "it is Phylum Foraminifera d'Orbigny, 1826 likely" that Dictyoconella "is merely a variant of the ge- Class Globothalamea Pawlowski et al., 2013 nus Iraqia". This assumption must be rejected because of Order Loftusiida Kaminski and Mikhalevich in Kamin- the difference in the central zone: reticulate in Iraqia (e.g. ski, 2004 Moullade, 1965) and pillaroid in Dictyoconella. It is Suborder Loftusiina Kaminski and Mikhalevich in Ka- worth noting at this point that the incorrect view of minski, 2004 Douglass was also approved by BouDagher-Fadel and Superfamily Orbitolinoidea Martin, 1890 Price (2009, p. 7) who included Dictyoconella in a group Family Orbitolinidae Martin, 1890 of "Orbitolinids with radial partitions that became zig- Subfamily Dictyoconinae Moullade, 1965 zagged, thickening and fusing centrally. Last but not Genus Dictyoconella Henson, 1948 emended herein least, neither Dictyononella complanata nor "D." minima Type-species: Dictyoconella complanata Henson, 1948. were treated in the revision of the Orbitolinidae by Cruz- Holotype P.35832 in Henson (1948), in repository at the Abad (2018) although the genus was considered valid by Natural History Museum London. Loeblich and Tappan (1987). Accessible from the origi- Diagnosis: Large-sized, laterally compressed test, flabel- nal samples of Qatar deposited at the Natural History liform. The test displays a distinct asymmetry, with one Museum in London (see pictures at nhm.ac.uk), the specside (with the eccentric embryo) that is wider (with re- imens were labeled Dictyoconella (Dictyoconus) comspect to the central axis) and presents a concave outer planata by Henson. In fact, Dictyconella is best described periphery in equatorial section. Test base distinctly con- as a distinctly compressed (flattened) Dictyoconus vex. Megalospheric embryo simple, biloculine with ellip- Blanckenhorn. Two specimens of Dictyoconella comsoidal protoconch and hemispherical to sickle-shaped planata were interpreted as microspheric specimens of
Fig. 2 in Dictyoconella Henson, 1948, Upper Cretaceous Larger Benthic Foraminifera: A Taxonomic Revision With The Establishment Of Gusicella Gen. Nov. (Type-Species Dictyoconella Minima Henson)
Fig. 2 Microfacies with Dictyoconella complanata Henson (a-b) and Gusicella minima (Henson) gen. et comb. nov. (c- d) from the Maastrichtian Tarbur Formation of the Naghan (a-b) and Mandegan sections (c-d), SW Iran (Zagros zone). Abbreviations: D = Dictyoconella, Di = Dicyclina, G = Gyroconulina, Gu = Gusicella, L = Loftusia, O = Omphalocyclus, P = Pseudonummoloculina, Ps = Pseudocymopolia, T = Tarburina. Thin sections: 2Ng 81 (a), 2Ng 81-4 (b), Rt 109 (c), Rt 105 (d).
Fig. 9 in Dictyoconella Henson, 1948, Upper Cretaceous Larger Benthic Foraminifera: A Taxonomic Revision With The Establishment Of Gusicella Gen. Nov. (Type-Species Dictyoconella Minima Henson)
Fig. 9 Gusicella minima (Henson) gen. et comb. nov. from the late Maastrichtian of the Tarbur Formation, SW Iran (Naghan section: c–f, h–k); Mandegan section: a–b, g, l). a subaxial section of an assumed microspheric specimen. b–c axial sections showing initial spire with acute margin beneath the apex. d oblique section showing the marginal trough between the marginal and central zones as well as a circular row of marginal apertures between. e tangential section showing subepidermal network; septa in the lower part marked by white dash lines. f subaxial section of a possibly microspheric specimen. g transverse section. h subaxial section. i tangential section showing aligned main beams. j subaxial section of a possibly microspheric specimen. k tangential section. l slightly oblique transverse section showing several orders of vertical partitions (beams, intercalary beams), marginal trough, and pillared central zone. Abbreviations: m.f. = marginal foramen, m.t. = marginal through, pi = pillar. Thin sections: Rt 105 (a), 2Ng 17 (c), Rt 96 (b), 2Ng 167 (d), 2Ng 174 (e), 2Ng 118-1 (f), Rt 108-2b (g), 2Ng 169 (h), 2Ng 191 (i), 2Ng 176 (j), 2Ng 146 (k), Rt 111-1 (l).
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Allen Brain Atlas
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