The Muscular Mechanism of the Male Metasoma and Genitalia of Megachile fortis Cresson (Hymenoptera: Megachilidae)

1956 ◽  
Vol 88 (12) ◽  
pp. 657-673 ◽  
Author(s):  
Roland L. Fischer
Keyword(s):  
Male Genitalia ◽  
Comparative Morphology ◽  
Reproductive Organs

The terminology pertaining to the structure of the male genitalia of the Hymenoptera has been subject to much confusion. Several systems, many purely descriptive in nature, have previously been set forch. Others were based on the various concepts of the ontogeny of the male genitalia, or on the comparative morphology of the adults. The investigation reported here began as an attempt to synthesize the various terminolopies and to evolve a workable set of terms pertaining to the structure of the male genitalia of the megachilid bees. Accordingly, a study was conducted on the myology of the group with the thought that perhaps an understanding of the comparative musculature might be of value in determining the homologies of the insect genitalia. This paper reports the results of a phase of the investigation on the morphology of the male metasoma, the muscular mechanism of the male metasoma and genitalia, and the gross structure of the internal reproductive organs of Megachile (Phaenosarsus) fortis Cresson. A second portion of the study, pertaining to the comparative morphology of the male genitalia and associated sterna of the Mecgachilidae, will be published later.

Memoirs: On the Development of the Male Genitalia and the Efferent Genital Ducts in Lepidoptera

1933 ◽  
Vol s2-76 (301) ◽  
pp. 35-61
Author(s):  
DEV RAJ MEHTA
Keyword(s):  
Male Genitalia ◽  
Abdominal Segment ◽  
Larval Instar ◽  
Ejaculatory Duct ◽  
External Genitalia ◽  
Reproductive Organs ◽  
Proximal Portion ◽  
Genital System ◽  
Larval Life ◽  
Accessory Glands

A general account of the internal reproductive organs and the external genitalia and their development is given. The ‘penis lobes’ develop earlier than the ‘valvae lobes’, and independently of them. The tegumen is the modified ninth tergite. The tenth segment is visibly distinguished into a tergal and sternal part in the pupal stages, and the anal tube passes between the two sclerites. The uncus and the gnathos are dorsal and ventral processes respectively of the tenth segment. The anellus lobes develop as lateral processes of the ninth sternite on either side of the penis. The vasa deferentia during larval life do not extend beyond the eighth abdominal segment and lie in a latero-ventral position. They meet the extensions from the ectodermal ‘ductus ejaculatorius duplex’ during the last larval stadium. From the earliest caterpillar stage there exists a pair of ectodermal ducts formed by the differentiation of the epidermis on the ninth sternite. Towards the end of larval life they divide by constriction to form the accessory glands and the ‘ductus ejaculatory duplex’. At this stage they extend on either side to meet the vasa deferentia. The vesiculae seminales develop by distension from the region of junction between the vasa deferentia and the proximal portion of the ejaculatory duct. The ‘ductus ejaculatorius simplex’ arises as an ectodermal invagination between the pair of ‘penis lobes’ during the final larval instar. It is established that, with the exception of the vasa deferentia, all the remaining elements in the efferent genital system are derived from the ectoderm.

XVII.—The Reproductive Organs in Hapalemur and Lepilemur

1955 ◽  
Vol 65 (3) ◽  
pp. 251-270
Author(s):  
W. C. Osman Hill ◽  
D. V. Davies
Keyword(s):  
Male Genitalia ◽  
Reproductive Organs ◽  
New Concepts ◽  
Internal Genitalia ◽  
First Time

SynopsisAn account of the morphology of the external and internal reproductive organs of the females of Hapalemur and Lepilemur and of the male of Hapalemur, including some histological details in both sexes of Hapalemur, is presented. The female apparatus in Hapalemur is described here for the first time, while new concepts emerge in connection with the male genitalia of Hapalemur and the female organs of Lepilemur, both of which have been imperfectly known. The tunnelling of the large clitoris by the urethra in Hapalemur is unique among the Madagascar lemurs and parallels the condition in the suborder Lorisoidea. The female Lepilemur exhibits typically lemurine external and internal genitalia, but lacks the glandular specialisations met with in Lemur. Details of the relative positions and peritoneal relations of the uterine cornua and ovaries in different lemurine genera are discussed. In the male Hapalemur the penis agrees with that of other Lemurinæ; internally some observations of Beddard and Oudemans are confirmed and supplemented. The necessity for the taxoaomic separation of Hapalemur is considered.

Comparative morphology of the male Australian Nepidae (Hemiptera : Heteroptera)

1967 ◽  
Vol 15 (3) ◽  
pp. 641 ◽  
Author(s):  
I Lansbury
Keyword(s):  
Male Genitalia ◽  
Comparative Morphology ◽  
Wing Venation ◽  
General Description

The male genitalia and wing venation of Austronepa, Laccotrephes, and Ranatra are described and compared. A general description is given of the male of Austronepa angusta (Hale). It is concluded that the male genitalia do not seem to provide reliable subfamily or tribal characters in the genera studied.

scholarly journals Comparative morphology of the male genitalia of Aphididae (Insecta, Hemiptera): part 1

Zoomorphology ◽  
2011 ◽  
Vol 130 (4) ◽  
pp. 289-303 ◽  
Author(s):  
Karina Wieczorek ◽  
Bartosz J. Płachno ◽  
Piotr Świątek
Keyword(s):  
Male Genitalia ◽  
Comparative Morphology

scholarly journals Taxonomy and phylogeny of the genus Gastrocentrum Gorham (Coleoptera, Cleridae, Tillinae), with the description of five new species

ZooKeys ◽  
2020 ◽  
Vol 979 ◽  
pp. 99-132
Author(s):  
Ganyan Yang ◽  
Xingke Yang ◽  
Hongliang Shi
Keyword(s):  
New Species ◽  
Male Genitalia ◽  
Reproductive Organs ◽  
Morphological Data ◽  
New Combination ◽  
Ne India ◽  
Cameron Highlands ◽  
Female Reproductive Organs

The genus Gastrocentrum Gorham, 1876 is revised to include nine species. Five new species are described in this genus: G. magnumsp. nov. (NE India), G. regularesp. nov. (Cameron Highlands, Malaysia), G. xiaodongisp. nov. (Gyirong, Xizang, China), G. zayuensesp. nov. (Zayü, Xizang, China), and G. gaoligongensesp. nov. (Fugong, Yunnan, China). Gastrocentrum nitidum Schenkling, 1916 is transferred to the genus Tillus as a new combination. All the species in this genus are described (except G. brevicolle), and a key is provided for their identification. Illustrations of male genitalia, female reproductive organs, and other important structures are provided. An interspecific phylogeny-estimate of Gastrocentrum is presented based on morphological data, with two main clades recognized: a clade containing G. unicolor and G. laterimaculatum, and a clade containing the remaining six species (the latter a polytomy consisting of G. magnumsp. nov., G. dux, and G. regularesp. nov., and a well-supported sub-clade representing the remaining species). Additionally, the taxonomic and phylogenetic importance of female reproductive organs is discussed.

Comparative morphology of female gonapophyses IX in Delphacidae (Hemiptera: Auchenorrhyncha: Fulgoromorpha) with key to tribes

Zootaxa ◽  
2019 ◽  
Vol 4564 (1) ◽  
pp. 137
Author(s):  
ADAM M. WALLNER ◽  
CHARLES R. BARTLETT
Keyword(s):  
Plant Tissue ◽  
Male Genitalia ◽  
Comparative Morphology ◽  
Host Tissue ◽  
Tooth Size ◽  
Size And Shape ◽  
High Concentrations

Diagnoses for delphacid species rely on male genitalia, with female structures rarely considered. In this study, we examined gonapophyses IX from 36 exemplar species, representing all 14 tribes of Delphacidae. From these 36 species, we found 53 potential synapomorphies. We present a key to delphacid tribes that integrates gonapophyses IX features. We hypothesize that the basal delphacids, the Asiracinae, have teeth concentrated at the apex to make short incisions into soft plant tissue. In Vizcayinae, these teeth are greatly reduced, extending past the apex, and may function to pierce host tissue. In Plesiodelphacinae, these teeth are increased in size and number, potentially to function as a saw. In Kelisiinae, teeth size is reduced, while teeth frequency is increased subapically. Finally, in the Stenocraninae and Delphacinae, the most derived lineages, an increase in tooth size and shape may have developed to cut into graminoid hosts with high concentrations of silicate. 

scholarly journals A comparative morphology of the male genitalia of Aphididae (Insecta, Hemiptera): part 2

Zoomorphology ◽  
2012 ◽  
Vol 131 (4) ◽  
pp. 303-324 ◽  
Author(s):  
Karina Wieczorek ◽  
Bartosz J. Płachno ◽  
Piotr Świątek
Keyword(s):  
Male Genitalia ◽  
Comparative Morphology

Anatomical review of Doris verrucosa and redescription of Doris januarii (Gastropoda, Nudibranchia) based on comparative morphology

2015 ◽  
Vol 95 (6) ◽  
pp. 1203-1220 ◽  
Author(s):  
Patricia O.V. Lima ◽  
Luiz R.L. Simone
Keyword(s):  
Eastern Europe ◽  
Type Species ◽  
Anatomical Study ◽  
Comparative Morphology ◽  
Reproductive Organs ◽  
Type Locality ◽  
Brazilian Coast ◽  
Nominal Species ◽  
Santa Catarina ◽  
Western Atlantic

Doris verrucosa Linnaeus, 1758 is the type species of Doris, the type genus of Dorididae. Its currently accepted distribution includes the Mediterranean, Eastern (Europe and Africa) and Western Atlantic (Massachusetts, USA to Santa Catarina, Brazil). Until now, papers on the anatomy of this species dealt with restricted characters such as rhinophores, radula and reproductive organs, never comparing specimens from different localities. In this study we have examined the anatomy of species similar to D. verrucosa from the Brazilian coast, and compared them with samples of D. verrucosa from Europe, the type locality. After an extensive complementary anatomical study of the circulatory, excretory, digestive, reproductive and nervous systems, the identity of the Brazilian specimens is clarified, proving that they belong to a different species. To solve the consequent nomenclatural gap, we revalidate Staurodoris januarii Bergh, 1878, described from Brazil, transferred to the genus Doris. The nominal species Doris verrucosa is, therefore, restricted to European waters.

Sign in / Sign up

Export Citation Format

Share Document