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32 results for “Tentorium”
FIGURES 23A–M. Labrundinia hirsuta Roback, adult male. A. Head, frontal view. B. Temporal setae. C. Tentorium. D. Cibarial pump. E in A taxonomic revision of genus Labrundinia Fittkau, 1962 (Diptera: Chironomidae: Tanypodinae)
FIGURES 23A–M. Labrundinia hirsuta Roback, adult male. A. Head, frontal view. B. Temporal setae. C. Tentorium. D. Cibarial pump. E. Apex of antenna. F. Wing. G. Apex of fore tibia. H. Fore tibial spur. I. Apex of mid tibia. J. Mid tibial spur. K. Apex of hind tibia with comb. L. Abdominal coloration pattern, dorsal aspect. M. Hypopygium, left: ventral aspect, right: dorsal aspect.
Data from: An assessment of the role of the falx cerebri and tentorium cerebelli in the cranium of the cat (Felis silvestris catus)
The falx cerebri and the tentorium cerebelli are two projections of the dura mater in the cranial cavity which ossify to varying degrees in some mammalian species. The idea that the ossification of these structures may be necessary to support the loads arising during feeding has been proposed and dismissed in the past, but never tested quantitatively. To address this, a biomechanical model of a domestic cat (Felis silvestris catus) skull was created and the material properties of the falx and tentorium were varied for a series of loading regimes incorporating the main masticatory and neck muscles during biting. Under these loading conditions, ossification of the falx cerebri does not have a significant impact on the stress in the cranial bones. In the case of the tentorium, however, a localised increase in stress was observed in the parietal and temporal bones, including the tympanic bulla, when a non-ossified tentorium was modelled. These effects were consistent across the different analyses, irrespective of loading regime. The results suggest that ossification of the tentorium cerebelli may play a minor role during feeding activities by decreasing the stress in the back of the skull.
Figure 2 from: Moritz L, Wesener T, Koch M (2018) An apparently non-swinging tentorium in the Diplopoda (Myriapoda): comparative morphology of the tentorial complex in giant pill-millipedes (Sphaerotheriida). In: Stoev P, Edgecombe GD (Eds) Proceedings of the 17th International Congress of Myriapodology, Krabi, Thailand. ZooKeys 741: 77-91. https://doi.org/10.3897/zookeys.741.21909
Figure 2 The tentorial complex of the Sphaerotheriida, 3D visualization. GREY = Head capsule; BROWN = mandible; ORANGE = tentorium; YELLOW = nebententorium; OLIVE = außententorium. A–D Arthrosphaera brandtii (Humbert, 1865), ZFMK MYR6265 E, F, I, J Sphaeromimus kalambatritra, CASENT 9058301 G, H Zoosphaerium bemanevika Sagorny & Wesener, 2017, ZFMK MYR6144. A tentorial complex and its association with the mandibular gnathal lobe and the head capsule of A. brandtii, dorsal view B same as A frontal view C tentorial complex of A. brandtii, frontal view D same as C medial view, with rotated epipharyngeal bar E tentorial complex of S. sp., frontal view F same as E medial view, with rotated epipharyngeal bar G tentorial complex of Z. bemanevika, frontal view H same as G medial view, with rotated epipharyngeal bar I tentorial complex and its association with the mandibular gnathal lobe and the headcapsule of S. sp., dorsal view J same as I, frontal view. Abbreviations: at = antennal socket; aut = mandibular gnathal lobe sclerite (außententorium); co = condylus of mandible; e1 = lateral projection of epipharyngeal bar; e2 = medial projection of epipharyngeal bar; eb = epipharyngeal bar; et = external tooth; h1 = projection of hypopharyngeal bar; hb = hypophayrangeal bar; hc = head capsule; ilp = projection arising from incisura lateralis; it = internal tooth; mp = molar plate; nt = nebententorium; pl = pectinate lamellae; pp = posterior process.
Figure 1 from: Moritz L, Wesener T, Koch M (2018) An apparently non-swinging tentorium in the Diplopoda (Myriapoda): comparative morphology of the tentorial complex in giant pill-millipedes (Sphaerotheriida). In: Stoev P, Edgecombe GD (Eds) Proceedings of the 17th International Congress of Myriapodology, Krabi, Thailand. ZooKeys 741: 77-91. https://doi.org/10.3897/zookeys.741.21909
Figure 1 Zoosphaerium sp., light micrographs of peristomatic structures. A Epipharynx, showing absence of the tentorial transverse bar B Preoral chamber, frontal view on hypopharynx (mandibles removed) C Hypopharynx and endochilarium, dorsal view (hypo- and epipharyngeal bar of right tentorium broken off). Scale bars: 500 µm. Abbreviations: eb = epipharyngeal bar of left tentorium; ed = endochilarium; ep = epipharynx; h1 = projection of hypopharyngeal bar; hb = hypopharyngeal bar of tentorium; hy = hypopharynx; il = incisura lateralis; lb = labrum; ll = lamella lingualis; lm = lamella-mentum; nt = nebententorium; ss = suspensorial sclerite; stg = stipes of gnathochilarium.
Figure 3 from: Moritz L, Wesener T, Koch M (2018) An apparently non-swinging tentorium in the Diplopoda (Myriapoda): comparative morphology of the tentorial complex in giant pill-millipedes (Sphaerotheriida). In: Stoev P, Edgecombe GD (Eds) Proceedings of the 17th International Congress of Myriapodology, Krabi, Thailand. ZooKeys 741: 77-91. https://doi.org/10.3897/zookeys.741.21909
Figure 3 Head musculature of Sphaeromimus kalambatritra. A, B, D–G micro-CT images C 3D segmentation. A Arrangement of mandible, tentorium and head capsule, frontal section B Incisura lateralis in detail, frontal section C 3D segmentation of the isolated tentorium and its muscles, medial view D, E Muscles of the epipharyngeal bar, fronto-medial view F Muscles of the posterior process, frontal section G Muscles of the nebententorium, frontal section. Top is frontal, left is lateral. Scale bars: A, D 1000 µm B, E–G 500 µm C not to scale. Abbreviations: a1 = lateral antennal muscle (m.); a2 = anterior antennal m.; at1 = first antennomere; co = condyle of mandibular gnathal lobe; eb = epipharyngeal bar; et = external tooth of mandible, g1 = lamella lingualis m.; g2 = lamello-mentum m.; aut = mandibular gnathal lobe sclerite (außententorium); hb = hypophayrangeal bar; hc = head capsule; il = incisura lateralis; ilp = projection arising from incisura lateralis; it = internal tooth of mandible; lab = labrum; ll = lamella lingualis of gnathochilarium; lm = lamello-mentum; mdb = mandibular base; mdg = mandibular gnathal lobe; mp = molar plate; nt = nebententorium; p1 = pharyngeal dilator m.; ph = pharynx; pl = pectinate lamellae of mandible; pp = posterior process; st = stipes of gnathochilarium; t1 = anterior tentorial m.; t2 = dorsal tentorial m.; t3 = posterior tentorial m.
Data from: An assessment of the role of the falx cerebri and tentorium cerebelli in the cranium of the cat (Felis silvestris catus)
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Fig. 15 in Unveiling the morphology of the Oriental rare monotypic ant genus Opamyrma YAMANE, BUI & EGUCHI, 2008 (Hymenoptera: Formicidae: Leptanillinae) and its evolutionary implications, with first descriptions of the male, larva, tentorium, and sting apparatus
Fig. 15: Scanning electron microscope images of larval mouthparts and prothoracic surface of Opamyrma hungvuong, nontype (AKY05vii17-06, China, Guangxi). (A) left maxilla in dorsal view; (B) labrum in ventral view; (C) labium in ventral view; (D) cuticular spinules on prothorax. Abbreviations: Gl = galea; Lbp = labial palp; Lbr = labrum; Mdb = mandible; Mxp = maxillary palp.
Fig. 4 in Unveiling the morphology of the Oriental rare monotypic ant genus Opamyrma YAMANE, BUI & EGUCHI, 2008 (Hymenoptera: Formicidae: Leptanillinae) and its evolutionary implications, with first descriptions of the male, larva, tentorium, and sting apparatus
Fig. 4: Tentorium of Opamyrma hungvuong worker, nontype (AKY05vii17-06, China, Guangxi). (A) anterior part of dorsal sclerite of cranium in dorsal view; (B) part of dorsal sclerite of cranium around right antennal socket with anterior part of tentorium, in inner ventral view; (C) part of ventral sclerite of cranium with posterior part of tentorium in inner dorsal view; (D) right half of tentorium in dorsal view (lacking posterior tentorial arm). Abbreviations: Ata = anterior tentorial arm; Atp = anterior tentorial pit; Ct = corpotendon; Dta = dorsal tentorial arm; Ep = external plate; Ip = internal plate; Lclp = lateral portion of clypeus; Mdb = mandible; Occ = occipital carina; Pgr = postgenal ridge; Pta = posterior tentorial arm; Ptg = peritorular groove; Ptp = posterior tentorial pit; Tb = tentorial bridge.
Fig. 1 in Unveiling the morphology of the Oriental rare monotypic ant genus Opamyrma YAMANE, BUI & EGUCHI, 2008 (Hymenoptera: Formicidae: Leptanillinae) and its evolutionary implications, with first descriptions of the male, larva, tentorium, and sting apparatus
Fig. 1: General habitus of Opamyrma hungvuong worker, nontype (AKY05vii17-06, China, Guangxi). (A) head in full-face view; (B) head in anteroventral view; (C) body in lateral view; (D) body in dorsal view. Abbreviations: Occ = occipital carina; Lbr = labrum; Pgr = postgenal ridge.
Fig. 5 in Unveiling the morphology of the Oriental rare monotypic ant genus Opamyrma YAMANE, BUI & EGUCHI, 2008 (Hymenoptera: Formicidae: Leptanillinae) and its evolutionary implications, with first descriptions of the male, larva, tentorium, and sting apparatus
Fig. 5: Scanning electron microscope images of antenna of Opamyrma hungvuong worker, nontype (AKY05vii17-06, China, Guangxi). (A) entire right antenna in dorsal view; (B) apical antennomere in dorsal view.
Fig. 9 in Unveiling the morphology of the Oriental rare monotypic ant genus Opamyrma YAMANE, BUI & EGUCHI, 2008 (Hymenoptera: Formicidae: Leptanillinae) and its evolutionary implications, with first descriptions of the male, larva, tentorium, and sting apparatus
Fig. 9: Sting apparatus of Opamyrma hungvuong worker, nontype (AKY05vii17-06, China, Guangxi). (A) spiracular plate in lateral view; (B) quadrate plate in lateral view; (C) anal arcs and anal plate in flattened dorsal view; (D) oblong plate and triangular plate in lateral view; (E) gonostylus in lateral view; (F) furcula in anterodorsal view; (G) furcula in posterior view; (H) sting in lateral view; (I) sting in dorsal view; (J) basal part of sting in lateral view; (K) Scanning electron microscope image of apical parts of sting and lancet in lateral view; (L) lancet and fulcral arm in lateral view. Abbreviations: Ana = anal arc; Anp = anal plate; Ap = anterior apodeme; Fa = fulcral arm; Gs = gonostylus; Lc = lancet; Ll = lateral lobe; Mc = medial connection; Pa = posterior arm; St = sting; Tp = triangular plate; Vc = valve chamber.
FIGURE 7. A–C, E. Head, ventral view. D. Tentorium, dorsal view. F. Labiomaxillary complex, ventral view. A, B in Revisited morphology applied for Systematics of flat wasps (Hymenoptera, Bethylidae)
FIGURE 7. A–C, E. Head, ventral view. D. Tentorium, dorsal view. F. Labiomaxillary complex, ventral view. A, B. Pristocera ♂; C. Zimankos ♂; D–F. Pristocera ♂.
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