scholarly journals A male black fly of Simulium (Simulium) iwatense (Shiraki) (Diptera: Simuliidae) with genitalia-like appendages on abdominal segment 8

2021 ◽  
Vol 38 (2) ◽  
pp. 68-71
Author(s):  
Takaoka H.
Keyword(s):  
Abdominal Segment ◽  
Black Fly ◽  
Segment 8

scholarly journals Comparative genitalic morphology in ten genera of thread-legged bugs of the tribe Metapterini, and its phylogenetic importance (Hemiptera: Heteroptera: Reduviidae)

2018 ◽  
Vol 58 (1) ◽  
pp. 91-125 ◽  
Author(s):  
Valentina Castro-Huertas ◽  
Dimitri Forero ◽  
Jocelia Grazia
Keyword(s):  
Male Genitalia ◽  
Abdominal Segment ◽  
Data Matrix ◽  
Potential Usefulness ◽  
Bursa Copulatrix ◽  
Wing Polymorphism ◽  
Male And Female ◽  
Basal Process ◽  
Segment 8 ◽  
Assassin Bug

The assassin bug tribe Metapterini belongs to the subfamily Emesinae (Hemiptera: Heteroptera: Reduviidae). Morphologically, it is characterized by the conspicuous basal process of the posteroventral series in the foreleg and the presence of wing polymorphism, with a high proportion of the genera with micropterous or apterous species. Here, the male and female ectodermal genitalic structures are documented for ten genera and twenty-three species of Metapterini, including eight species of the speciose genus Ghilianella Spinola, 1850. Descriptions and digital macrophotographs are provided for abdominal segment 8, pygophore, parameres, and phallus of the male, and for tergite 8, tergite 9, gonocoxae, gonapophyses, gonoplac, and bursa copulatrix of the female. The asymmetric male genitalia within Emesinae are discussed. From this morphological documentation sixty six phylogenetic characters are coded, presented as a data matrix and analyzed cladistically, and their potential usefulness for resolving relationships among Metapterini is discussed.

The effect of lethal mutations and deletions within the bithorax complex upon the identity of caudal metameres in the Drosophila embryo

Development ◽  
1986 ◽  
Vol 93 (1) ◽  
pp. 153-166
Author(s):  
J. R. S. Whittle ◽  
S. Y. K. Tiong ◽  
C. E. Sunkel
Keyword(s):  
Abdominal Segment ◽  
Sense Organ ◽  
Drosophila Embryo ◽  
Bithorax Complex ◽  
Sense Organs ◽  
Head Region ◽  
Lethal Mutations ◽  
Segment 8 ◽  
Derivatives Of ◽  
Cuticular Structures

Mutations and deletions of the abdA and AbdB functions in the bithorax complex of Drosophila melanogaster have been examined for their effect upon the hypodermal derivatives of the caudal segments of the embryo, employing light- and scanning electron microscopy. No cuticular structures located posterior to the denticle belt of abdominal segment 8 are affected in abdA− embryos. Embryos of AbdB− genotype no longer have six of the seven pairs of sense organs present in this region, lack posterior spiracles but instead have sclerotized cuticle and sense organs typical of the head region and a rudimentary extra ventral denticle belt. The anal pads, tuft and sense organ 1 do not require BX-C functions for their specification. We discuss the provenance of these cuticular structures and the domain of function of elements within the bithorax complex in terms of parasegmental metameric units.

Tracheal patterns in larval Chironomidae (Diptera, Nematocera)

1980 ◽  
Vol 11 (3) ◽  
pp. 291-296 ◽  
Author(s):  
Gregory Goetz
Keyword(s):  
Environmental Factors ◽  
Abdominal Segment ◽  
Entire Length ◽  
Tracheal System ◽  
Chironomid Larvae ◽  
Segment 8

AbstractThe tracheal systems of 142 chironomid larvae (42 species) were examined. These tracheal patterns showed considerable variation, both between subfamilies, and within a particular subfamily. The dorsal trunks, lateral trunks, dorsal anastomoses, and subcuticular tracheation were the major tracheal components examined in this study. Orthocladiinae, Diamesinae and Tanypodinae larvae exhibit the most extensive tracheal systems differing mainly in the placement of anastomoses. In some Podonominae species the tracheal system extends only to abdominal segment 8, where the trunks merge to form an open spiracle. Other podonomines, though not examined, are apneustic. The Chironominae tracheal system appears to extend the entire length of the larva, but only certain portions of it are filled with air. In Tanytarisini air is present in the thoracic tracheae and the terminal abdominal tracheae. In some Chironomini, air is present only in the thoracic tracheae, while other members of this tribe exhibit the 'Tanytarsini' pattern. The phylogeny of the Chironomidae, and the effects of environmental factors on the tracheal system are discussed.

A new Oncylocotis Stål (Hemiptera: Heteroptera: Enicocephalidae) from Sabah: a predacious species associated with the yellow crazy ant, Anoplolepis gracilipes (Smith) (Hymenoptera: Formicidae)

Zootaxa ◽  
2010 ◽  
Vol 2651 (1) ◽  
pp. 27
Author(s):  
PAVEL ŠTYS ◽  
PETR BAŇAŘ ◽  
JOCHEN DRESCHER
Keyword(s):  
Abdominal Segment ◽  
Insect Species ◽  
Anoplolepis Gracilipes ◽  
Old World ◽  
Anatomical Features ◽  
Segment 8 ◽  
Males And Females ◽  
Predacious Species

We describe Oncylocotis (Oncylocotis) inexpectatus n. sp. (Hemiptera: Heteroptera: Enicocephalomorpha: Enicocephalidae) from Malaysia (Sabah). It is the first species of this widely distributed Old World genus from Borneo. Some plesiomorphic anatomical features of the species are discussed and illustrated; e.g., the clypeus subdivided into well delimited anteclypeus and postclypeus; prescapite present; male abdominal segment 8 not modified for genital purposes, and abdominal segments 1–8 bearing spiracles in both males and females. New data on subdivision of the abdomen and venation of the clavus in enicocephalids are provided. The predacious O. inexpectatus n. sp. was found in association with the invasive 'yellow crazy ant', Anoplolepis gracilipes (Smith) (Hymenoptera: Formicidae) which is ranked among the 100 most devastating invaders worldwide. We bring together the information on this association and review the known cases of myrmecophily in the infraorder Enicocephalomorpha. A list of insect species found as inquilines of A. gracilipes in Sabah is included.

Larval black fly (Diptera: Simuliidae) distribution and diversity along a floodplain river in the Alps (Tagliamento River, Italy)

2002 ◽  
Vol 28 (2) ◽  
pp. 524-531
Author(s):  
David B. Arscott ◽  
Rolf Glatthaar ◽  
Klement Tockner ◽  
J. V. Ward
Keyword(s):  
Black Fly ◽  
Floodplain River ◽  
The Alps ◽  
Tagliamento River

Oxidative Activity of Aortic Tissue of Man, the Rabbit and the Dog, With Special Reference to Succinic Dehydrogenase and Cytochrome Oxidase

1958 ◽  
Vol 195 (2) ◽  
pp. 476-480 ◽  
Author(s):  
Nelicia Maier ◽  
Henry Haimovici
Keyword(s):  
Special Reference ◽  
Cytochrome Oxidase ◽  
Abdominal Aorta ◽  
Abdominal Segment ◽  
Species Difference ◽  
Succinic Dehydrogenase ◽  
Hepatic Tissue ◽  
Human Aorta ◽  
Aortic Tissue ◽  
Enzymatic Systems

Succinic dehydrogenase and cytochrome oxidase activities were determined in homogenates of three aortic segments (ascending and arch, descending thoracic, abdominal) and liver of man, the rabbit and the dog. Both enzymes exhibited the lowest activity in human aorta. Succinic dehydrogenase exhibited the highest activity in the thoracic aorta of the dog and intermediate activity in the latter's abdominal segment and the rabbit's aorta. Cytochrome oxidase, in contrast, exhibited the highest activity in the rabbit's aorta. A slight gradient of decreasing activity from thoracic to abdominal aorta was noted for cytochrome oxidase in both the rabbit and dog and for succinic dehydrogenase in the rabbit, whereas a significant decrease in the latter enzyme was noted in the abdominal segment of the dog. No gradient of activity was apparent in man. Liver exhibited the lowest activity for both enzymes in man, highest in the dog and intermediate in the rabbit. The above findings suggest a biologic species difference between the aorta of man, the rabbit and the dog, which may be partly ascribed to a difference in the components of the above two enzymatic systems. The same species difference holds true for hepatic tissue.

Morphology of the first instar nymph of Leucaspis loewi Colvée (Hemiptera: Coccinea: Diaspididae)

2012 ◽  
Vol 81 (1) ◽  
pp. 43-47
Author(s):  
Elżbieta Podsiadło ◽  
Anna Mazurkiewicz
Keyword(s):  
Abdominal Segment ◽  
Instar Nymph ◽  
First Instar ◽  
Campaniform Sensillum ◽  
Anterior Spiracle

Morphology of the first instar nymph of Leucaspis loewi Colvée (Hemiptera: Coccinea: Diaspididae) The first instar nymph of Leucaspis loewi Colvée is redescribed and illustrated. The sex has not been determined. It has 5-segmented antennae, one trilocular disc pore associated with the anterior spiracle, one pair of well-developed lobes, and fimbriate plates on all abdominal segments. Tibia and tarsus are not fused - they are separated from each other by a septum. A campaniform sensillum is always present at the bases of the tarsi. Dorsal submedian setae are present on each abdominal segment 1-7.

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