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  • 1
    Electronic Resource
    Electronic Resource
    Artificial feeding of simuliids (Simulium venustum): Factors associated with probing and gorging (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 694-695 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé On décrit une technique simple et pratique servant à nourrir des simuliidés à travers des membranes de latex commercialement disponible. On démontre avant tout que la chaleur est un facteur essentiel qui induit le sondage et que l'adénosine triphosphate et l'adénosine diphosphate stimulent l'engorgement deSimulium venustum Say.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01944634
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  • 2
    Electronic Resource
    Electronic Resource
    Fine structure of antennal grooved pegs of the mosquito, Aedes aegypti (1974)
    Springer
    Cell & tissue research 153 (1974), S. 327-337 
    Details
    ISSN: 1432-0878
    Keywords: Olfactory receptor ; Sensillum ; Mosquito ; Fine structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The grooved pegs also referred to in the literature as type A3 setae, thornshaped hairs, pegs, and sensilla basiconica of female Aedes aegypti (L.) are described. Externally the sensillum appears as a short, thick-walled, non-articulated peg with usually 12 grooves in the wall and bearing one terminal pore. Usually three, occasionally four or five, neurons with unbranched dendrites innervate each peg. The dendrites are encased in a prominent cuticular sheath from the ciliary region to the tip of the peg. Three sheath cells are associated with each sensillum. Although the grooved pegs have the structure commonly associated with contact chemoreceptors they function exclusively in the reception of air-borne stimuli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229162
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  • 3
    Electronic Resource
    Electronic Resource
    Innervation and structure of mouth part sensilla in females of the black fly Simulium venustum (Diptera: Simuliidae) (1982)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 171 (1982), S. 245-258 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Associated with the mouth parts of female Simulium venustum are 13 morphologic types of sensilla: four on the labium, seven on the labrum, one in the cibarium, and one on the genal process to which the mandibles articulate. Seven types are probably sensitive only to mechanicla cues and three only to chemical ones, whereas the other three probably function in both modes. These sensilla likely monitor feeding-associated chemical features of blood, sugar, and water and mechanical cues generated by the physical acts of ingestion.Each S. venustum female has approximately 450 chemosensitive and 230 mechanosensitive neurons in the mouthpart-associated sensilla. Both the total number of chemosensory neurons and the ratio of chemosensory to mechanosensory neurons in S. venustum are intermediate between those for blow flies, which feed on a wide variety of foodstuffs, and tsetse flies, exclusive blood-feeders. These differences may be related to whether determination of acceptability of a potential food source occurs at the site of feeding and is dependent upon simultaneous sensitivity to many chemical cues, as in blow flies, or is the result of a complex stimulus chain composed of all host-location steps and culminating with the detection of but a few phagostimulants in the food itself, as in blood-feeders.
    Additional Material: 32 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051710302
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  • 4
    Electronic Resource
    Electronic Resource
    Fine structure of maxillary sensilla of larval Toxorhynchites brevipalpis (Diptera: Culicidae) with comments on the role of sensilla in behavior (1982)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 171 (1982), S. 293-303 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Each maxilla of fourth instar Toxorhynchites brevipalpis bears nine sensilla: Four are located at the tip of the maxillary palp and five on the maxillary body. At the palp tip are three tapered pegs on bulbous bases (MS1, MS2, MS6) that are innervated by four, two, and two neurons, respectively, and probably function in chemoreception. Also at the palp tip is a sturdy, cuticular rod with a lumen (MS5) that opens distally to the exterior. The proximal end of the rod is closed by a cuticular base to which a single unbranched dendrite containing only a few microtubules is attached. The function of MS5 is enigmatic; possibilities include mechanoreception and detection of infrared radiation.On the maxillary body are two tapered pegs on a common bulbous base (GS1, GS2) that are each innervated by three neurons, and probably are chemosensory. Three setae also occur on the maxillary body. They arise from prominent sockets and are each innervated by a neuron terminating at the hair base as a tubular body, a characteristic of cuticular mechanosensilla.The maxillary sensilla are innervated by a total of 18 neurons: 14 are probably chemosensory, three mechanosensory, and one is of unknown function. These results, combined with those from a previous study on antennal sensilla (Jez and McIver, '80), indicate that the mechanosensitive neurons of the antennae and maxillae are a relatively small percentage of the total mechanosensilla on the entire larva. In contrast the chemosensitive neurons of the antennae and maxillae provide most of the information about the chemical environment of the larva.T. brevipalpis has three less than the maximum of seven maxillary palpal sensilla found in larval mosquitoes so far studied. This difference may reflect a lesser need for sensory information about the acceptability of potential food in predators compared to browsers and filter-feeders.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051710305
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  • 5
    Electronic Resource
    Electronic Resource
    Fine structure of antennal putative thermo-/hygrosensilla of adult Rhodnius prolixus Stål (Hemiptera: Reduviidae) (1985)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 183 (1985), S. 15-23 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: At least five nonporous sensilla with inflexible sockets (npsensilla) occur on each antenna of both sexes of adult Rhodnius prolixus. Externally the sensillum appears as a short, rounded peg set into a pit surrounded by a depression. A very electron-dense material occurs in the peg lumen and the inner aspect of the pit. Filamentous extensions of this material radiate into the overlying outlets.Each sensillum is innervated by three neurons with unbranched dendrites. Two dendrites extend to the peg tip and distally are covered by a dendritic sheath. The portion of these dendrites within the sheath contains a large number of microtubules. The third dendrite terminates near the base of the dentritic sheath and partially wraps around the other two dendrites. Three sheath cells are associated with each sensillum.Based on similarities in structure with sensilla of known function it is probable that the np-sensilla of R. prolixus are thermo-/hygrosensilla responding to cold, dryness and wetness. The sensilla have a number of structural similarities with insect rectal sheath cells known to absorb atmospheric water by electroosmosis. Possibly this process leads to volumetric alterations of cuticular elements associated with the dendrites and ultimately to mechanotransduction.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051830103
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  • 6
    Electronic Resource
    Electronic Resource
    Fine structure of tarsal sensilla of male and female Simulium vittatum (Diptera: Simuliidae) (1987)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 192 (1987), S. 13-26 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Scanning and transmission electron microscopic examination of the general and sensillar anatomy of the prothoracic tarsus of male and female Simulium vittatum reveals four kinds of hair-type sensilla: (1) generally distributed, mechanosensitive type 1 sensilla trichodea; (2) type 2 sensilla trichodea similar to type 1 though smaller and restricted to the ventral surfaces of tarsomeres 1-4; (3) triply-innervated, taste-sensitive peg sensilla of the ventral surfaces of tarsomeres 1-4; and (4) mid-laterally and terminally distributed type 1 sensilla chaetica that possess one mechanosensitive and four chemosensitive neurons. In addition, wholly internal chordotonal sensilla associated with the tarsal tendon are described. Regions of presumed was-secreting epithelial cells were found to line much of the inner ventral tarsal surface. Anatomical findings are discussed in terms of behavioral and/or physiological significance.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051920103
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  • 7
    Electronic Resource
    Electronic Resource
    Fine structure of tarsal sensilla of Aedes aegypti (L.) (Diptera: Culicidae)Financial support by the Medical Research Council, Canada, Grant MA 2909 is gratefully acknowledged. (1978)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 155 (1978), S. 137-155 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The tarsi of all three pairs of legs of both sexes of Aedes aegypti (L.) bear spine sensilla, five types of hair sensilla, which are designated A, B, C1, C2 and C3, and campaniform sensilla. Type A and B hairs, spines, and cam-paniform sensilla are innervated by one neuron with a tubular body, a characteristic of cuticular mechanoreceptors. In particular the hairs and spines are tactile receptors and the campaniform sensilla are proprioceptors. The C1, C2, and C3 hair sensilla have the morphological features of contact chemoreceptors. Type C1 and C3 hairs are innervated by five and four neurons, respectively, which extend to the tip of the hair. Type C2 is innervated by five neurons, one of which terminates at the base of the hair in a tubular body while the remaining four extend to the tip of the hair. The role of the type C hairs in oviposition behavior, nectar feeding, and recognition of conspecific females is discussed. Presumed efferent neurosecretory fibers occur near the spine and hair sensilla.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051550202
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  • 8
    Electronic Resource
    Electronic Resource
    Bifurcate sensilla on the tarsi of female black flies, Simulium venustum (Diptera: Simuliidae): Contact chemosensilla adapted for olfaction? (1980)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 165 (1980), S. 1-11 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The ventral surface of the most proximal tarsomere of each mesothoracic leg of the female black fly, Simulium venustum Say, bears approximately 60 bifurcate sensilla. Externally, a sensillum appears as a hair set into an asymmetric socket and with the distal tip flattened into two flared lobes. A single pore opens into a short groove at the base of the lobes. The hair shaft is divided into two lumina, one of which contains the dendrites. Each sensillum is innervated by four neurons, the dendrites of which extend unbranched to the pore. Sensillum liquor bathes the dendritic tips and extends through the pore into the adjacent groove and across part of the lobes. A sieve-like structure exists in the pore region of many if not all sensilla. At least two sheath cells are associated with each sensillum.It is suggested that, although the bifurcate sensilla have the internal structure associated with known contact chemosensilla, they have secondarily acquired an olfactory function which is facilitated by the flattened lobes which increase the adsorptive surface area.Along each side of the bifurcate sensilla is a row of sturdy spines, each innervated by a neuron with a tubular body, a characteristic of cuticular mechanoreceptors. These spines are likely tactile sensilla.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051650102
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  • 9
    Electronic Resource
    Electronic Resource
    Fine structure of antennal mechanosensilla of adult Rhodnius prolixus stål (Hemiptera: Reduviidae) (1984)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 180 (1984), S. 19-28 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Each antenna of both sexes of adult Rhodnius prolixus has approximately 570 mechanosensitive neurons that innervate five morphologic types of cuticular mechanosensilla: campaniform sensilla, tapered hairs, trichobothria, and type I and type II bristle sensilla. Each campaniform sensillum and tapered hair is presumably innervated by one mechanosensitive bipolar neuron and probably functions in proprioception. The campaniform sensilla being located at the base of the scape could monitor the position of the antenna. Tapered hairs are found at the distal margin of flagellar segment I and projecting laterally from the bases of the pedicel and scape. They probably provide information about the relative positions of the antennal segments. Seven trichobothrium are located on the pedicel and three on flagellar segment I. Each trichobothrium has a long filamentous hair inserted into the base of a socket that extends inwardly as a cuticular tube and is innervated by one bipolar neuron with a tublar body, a parallel arrangement of microtubules associated with electron-dense material. The trichobothria may respond to small variations in air currents.Type I bristles occur at the base of the antenna and are the most numerous type of mechanosensillum; an average of 452 occur on each antenna of females and 440 on males. The bristle is curved toward the antennal shaft and is serrated distally. Type II bristles are located distally and are the second most numerous type of mechanosensillum; an average of 88 were counted on each antenna of females and 94 on males. The type II bristle is straight with small, longitudinal, external grooves and projects laterally from the antennal shaft. Each type I and II bristle sensillum is innervated by a bipolar neuron whose dendrite is divided into an inner and outer segment. The outer segment is encased by a dendritic sheath which may be highly convoluted and distally contains a tubular body. Two sheath cells are associated with each sensillum. Both types of bristle sensilla have a tactile function.The tubular bodies of both types of bristle sensilla have a complex structure indicating that they are very sensitive. Variations in the amount and arrangement of the electron-dense material at the tip of the tubular bodies may reflect differences in viscoelastic properties that underlie functional characteristics.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051800104
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  • 10
    Electronic Resource
    Electronic Resource
    Mechanics of blood-feeding in black flies (Diptera, simuliidae) (1984)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 180 (1984), S. 125-144 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The structure and interrelationships of the mouthparts and of the food canal and its accessory cephalic structures of the females of Simulium venustum are described through microscopic observations. The mouthparts that enter the would during feeding are the mandibles, maxillary laciniae, hypopharynx, and labrum and collectively form a “syntrophium.” The labium and labellar lobes, which do not enter the wound, ensheathe the syntrophium distally and must be retracted to allow biting.We present an interpretation of mouthpart function during biting that emphasizes how biting steps are accomplished and what sensory structures are used to monitor the process. Four phases of biting are identified: (1) initial penetration of the skin effected by the mandibles; (2) consolidation of mouthpart position involving anchoring the syntrophium into the wound by means of the barbed laciniae; (3) diet sampling and active feeding - food (blood) is pumped by three groups of muscles forming two functional pumps, one located in the cibarium, the other in the pharynx. These pumps are separated from each other and from surrounding regions of the food canal by valve muscles making the pumping process a complex and highly coordinated series of muscular contractions; and (4) mouthpart disengagement involving removal of the laciniae, thus releasing the syntrophium from the wound.
    Additional Material: 30 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051800204
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