Taxonomic value of minute structures on the genital segment ofPontellina females (Copepoda: Calanoida)

1990 ◽  
Vol 105 (1) ◽  
pp. 99-108 ◽  
Author(s):  
K. Hulsemann ◽  
A. Fleminger
Keyword(s):  
Genital Segment

scholarly journals A new species of the genus Cerviniopsis from Sagami Bay, Japan and reinstatement of the genus Neocervinia, with a report on the male of Neocervinia itoi Lee & Yoo, 1998 (Copepoda: Harpacticoida: Aegisthidae)

Zootaxa ◽  
2012 ◽  
Vol 3575 (1) ◽  
pp. 27 ◽  
Author(s):  
EUN-OK PARK ◽  
MOTOHIRO SHIMANAGA ◽  
SUK HYUN YOON ◽  
WONCHOEL LEE
Keyword(s):  
New Species ◽  
Deep Sea ◽  
Distal Margin ◽  
Sexually Dimorphic ◽  
Sagami Bay ◽  
Genital Segment ◽  
Male Characters ◽  
Superficial Resemblance ◽  
Caudal Rami ◽  
A New Species

A new aegisthid copepod, Cerviniopsis reducta sp. nov. is described from the deep sea in Sagami Bay, Japan. The newspecies has superficial resemblance to C. minutiseta Ito, 1983 in the armature formula of swimming legs. However theydiffer from each other in the shape of setae of the swimming legs, the distal margin of operculum, length of caudal rami,and the location of setae on P5 exopod. Also, the male of Neocervinia itoi Lee & Yoo, 1998 is described on the basis ofsamples collected from around the type locality in Sagami Bay, Japan. Sexual dimorphism of N. itoi male can be observedin the fused rostrum, atrophied mouthparts, P5, and P6. The sixth leg is symmetrical and both gonopores are presumablyactive, based on the presence of two spermatophores internally in the genital segment. This paper reports for the first timeon the sexually dimorphic characters in the genus Neocervinia Huys, Mobjerg & Kristensen, 1997, reinstating its generic status with the newly revealed male characters.

Pseudechetus fimbriatus gen. et sp.nov., a caligid copepod from Kerala coastal waters

Parasitology ◽  
1979 ◽  
Vol 79 (3) ◽  
pp. 425-429 ◽  
Author(s):  
C. Prabha ◽  
N. Krishna Pillai
Keyword(s):  
Coastal Waters ◽  
New Genus ◽  
Double Structure ◽  
Genital Segment

SUMMARYPseudechetus fimbriatus gen. et sp.nov. from the throat of a carangid is described. The new genus has the closest resemblance to Parechetus Pillai from which it differs in the presence of 4 processes instead of 2 on the genital segment and a pair of processes on the abdomen instead of wings. The sternal fork carries accessory tines anteriorly making it a double structure.

The parasitic crustaceans of fishes from the Brazilian Amazon. 11. Vaigamidae fam. nov. (Copepoda: Poecilostomatoida) with males and females of Vaigamus retrobarbatus gen. et sp. nov. and V. spinicephalus sp. nov. from plankton

1984 ◽  
Vol 62 (4) ◽  
pp. 716-729 ◽  
Author(s):  
Vernon E. Thatcher ◽  
Barbara A. Robertson
Keyword(s):  
New Genus ◽  
Narrow Band ◽  
Antennal Segment ◽  
Brazilian Amazon ◽  
Thoracic Segment ◽  
The Other ◽  
The Third ◽  
Genital Segment ◽  
Pigment Distribution ◽  
Males And Females

Vaigamus retrobarbatus gen. et sp. nov. and V. spinicephalus sp. nov. (Copepoda: Poecilostomatoida) are described. The specimens were obtained by examining plankton samples from floodplain lakes of the Amazon River Basin in Brazil. The new genus is distinguished from all other genera and families in the suborder by the presence of retrostylets projecting laterally from the first thoracic segment and a long tapering rostral spine between the bases of the antennae. Vaigamidae fam. nov. is proposed for these forms. The two new species of the new genus are distinguished on the basis of the following characters. Size: retrobarbatus is larger than spinicephalus. Cephalothorax: that of spinicephalus is more ovoid. Pigment distribution: retrobarbatus had a broad transverse band of color on the cephalothorax while spinicephalus has a narrow band on the fourth thoracic segment. Rostral spine: spinicephalus has a spine with a subbasal swelling while that of the other species is smoothly tapering. Genital segment: that of retrobarbatus is more hexagonal. Antennal claw: in retrobarbatus the claw is longer than the third antennal segment while in the other species it is shorter. Leg 4: retrobarbatus has one fewer segment in each ramus than has the other species. Leg 6: that of retrobarbatus is longer.

scholarly journals Morphology and terminology of dung beetles (Coleoptera: Scarabaeidae: Scarabaeinae) male genitalia

Zootaxa ◽  
2013 ◽  
Vol 3626 (4) ◽  
pp. 455-476 ◽  
Author(s):  
CLAUDIA A. MEDINA ◽  
FREDY MOLANO ◽  
CLARKE H. SCHOLTZ
Keyword(s):  
Male Genitalia ◽  
Dung Beetles ◽  
Genital Segment ◽  
Internal Structures

The external and internal male genitalia of 327 species of 11 tribes of the subfamily Scarabaeinae, including species of Deltochilini, Scarabaeini, Gymnopleurini, Ateuchini, and Coprini, among others, were examined. Descriptions of the variations in the genital segment, the aedeagus, the internal sac, and its sclerites and raspules are presented. An exhaustive comparison of structures, names, and terminology used in literature for Scarabaeinae male genitalia are discussed. The internal sac of the aedeagus is divided in areas for an easer comparison of its internal structures; basal, submedial, medial, and apical areas are described in detail and compared. The variation of apical and medial sclerites, as well as the raspules of the submedial area, are described and compared in detail among all the taxa studied.

Structure, ultrastructure et essai d'interprétation fonctionnelle de l'appareil génital femelle d'Hemidiaptomus ingens provinciae et de Mixodiaptomus kupelwieseri (Copepoda, Calanoida). II. L'aire génitale

1989 ◽  
Vol 67 (10) ◽  
pp. 2579-2587 ◽  
Author(s):  
Corinne Cuoc ◽  
Jean Arnaud ◽  
Michel Brunet ◽  
Jacques Mazza
Keyword(s):  
Seminal Receptacle ◽  
Outer Part ◽  
Ventral Side ◽  
Egg Laying ◽  
The Other ◽  
Circular Section ◽  
Genital Segment ◽  
Genital Area ◽  
Double Function

The genital area in Hemidiaptomus ingens provinciae and Mixodiaptomus kupelwieseri is made up of several external and internal solidary cuticular components, which connect the genital ducts with the outside. Its outer part, which is located on the ventral side of the genital segment, is delimited by an ovoid cuticular fold and by two swelling processes, one dorsal and the other ventral. The center is occupied by two operculums, which are separated from a median wall by two crescent-shaped genital apertures. The inner part of the area essentially includes two U-shaped ducts by which the oviducts are connected to the genital apertures. During egg laying, to allow oocytes and oviductal secretions to be carried out through the genital apertures, the ducts take a more or less circular section, owing to the contraction of muscles attached to their wall. At this stage, the genital area is entirely masked by a temporary external seminal receptacle. The genital area assumes a double function in reproduction: first, in stocking spermatozoa in the seminal receptacle, and second, in allowing oocyte laying and fecondation as they are pushed into the ovisac.

Systematics of the southern African genus Epirinus Reiche (Coleoptera: Scarabaeinae: Canthonini): descriptions of new species and phylogeny

2005 ◽  
Vol 36 (2) ◽  
pp. 145-160 ◽  
Author(s):  
Claudia Medina ◽  
Clarke Scholtz
Keyword(s):  
New Species ◽  
Phylogenetic Relationships ◽  
Cladistic Analysis ◽  
Morphological Characters ◽  
Distribution Map ◽  
Male And Female ◽  
Separate Genus ◽  
Genital Segment ◽  
The Past ◽  
African Genus

AbstractThe genus Epirinus is reviewed. It consists of 29 species, including six new ones described in this paper: E. aquilus, E. hluhluwensis, E. minimus, E. ngomae, E. pseudorugosus and E. sebastiani. A key to all the species of Epririnus is provided as are distribution map and illustrations of the most important morphological features to distinguish the species. Phylogenetic relationships within the genus are investigated, using cladistic analysis of 79 morphological characters including male and female genitalia. Various synapomorphies support the genus Epirinus as a monophyletic group of species. They are: shape of the internal border of the eye, genital segment with short projections, and presence of sclerite “X” in the internal male genitalia. There is no support for the flightless species to be treated as a separate genus, as has been proposed in the past.

A new species of Archaebranchinecta (Anostraca: Branchinectidae) from the South American Altiplano

Zootaxa ◽  
2019 ◽  
Vol 4683 (1) ◽  
pp. 55-83 ◽  
Author(s):  
ROSA GRACIELA COHEN ◽  
MARÍA CRISTINA MARINONE ◽  
SARAH J. ADAMOWICZ
Keyword(s):  
New Species ◽  
South America ◽  
South American ◽  
Morphological Comparison ◽  
Lake Titicaca ◽  
Basal Segment ◽  
Genital Segment ◽  
Western Shore ◽  
A New Species ◽  
Male Genital

A detailed morphological comparison was carried out among specimens of several samples of Archaebranchinecta Rogers & Coronel, 2011 from the Altiplano of Peru, Bolivia, and Argentina. Surprisingly, striking differences were found between Peruvian samples collected near the western shore of Lake Titicaca, and those from Bolivia taken southwardly, near the east coasts of River Desaguadero and Lake Poopó. Accordingly, the new species Archaebranchinecta aimara sp. nov. is described, representing the second specific entity of a genus that so far included only A. pollicifera (Harding, 1940). The main differential features between both species include: (a) size and shape of the three processes of basal segment of the male second antenna; (b) shape and protrusion degree of the pair of medioventral bulges in the male genital segments; (c) presence or absence of strong ventrolateral spine on the second genital segment of female; and (d) presence or absence of a pair of ventrolateral outgrowths in the brood pouch. This research contributes to our understanding of the biodiversity and endemism of the unique Altiplano region of South America. 

Patterns of spermatophore distribution and placement in Euchaeta norvegica (Copepoda: Calanoida)

1977 ◽  
Vol 57 (1) ◽  
pp. 113-131 ◽  
Author(s):  
C. C. E. Hopkins ◽  
D. Machin
Keyword(s):  
Genital Segment ◽  
Female Genital

The spermatophore in the Copepoda is an elongated flask-shaped object produced by the male copepod in which are contained the sperm and associated secretions. The male must attach the spermatophore to the female genital segment in such a position that the opening to the neck of the spermatophore, through which the sperm come out, is in contact with the opening of the female cavity. Placement of the spermatophore elsewhere, in such a manner that connexion with the female genital cavity is not achieved, may not cause fertilization and will waste sperm.

A New Species of Gerris F. from Yukon and Alaska (Hemiptera: Gerridae)

1961 ◽  
Vol 93 (8) ◽  
pp. 663-665 ◽  
Author(s):  
Leonard A. Kelton
Keyword(s):  
New Species ◽  
North America ◽  
Antennal Segment ◽  
Eastern North America ◽  
Western North America ◽  
Genital Segment ◽  
A New Species ◽  
General Appearance

Two species that formerly were confused in the literature with Gerris rufoscutellatus Latreille are G. notabilis Drake and Hottes (1925) from western North America, and G. dissortis Drake and Harris (1930) from eastern North America. Drake and Harris (1934) concluded that Palaearctic rufoscutellatus did not occur in America.The species described herewith as Gerris nearcticus n. sp. is similar to notabilis, dissortis and rufoscutellatus in general appearance and coloration. However, the males are readily separated from notabilis and dissortis by the prominent median keel on the first genital segment (Figs. 1, 2). Another Nearctic species with a similar median keel is G. conformis (Uhl.), but it has a very long first antennal segment, which is longer than segments two and three together. The first antennal segment of nearcticus is much shorter than segments two and three together.

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