A neotype for Cephalobus persegnis Bastian, 1865, redescription of the species, and observations on variability in taxonomic characters

1970 ◽  
Vol 48 (3) ◽  
pp. 457-469 ◽  
Author(s):  
R. V. Anderson ◽  
D. J. Hooper
Keyword(s):  
Reproductive System ◽  
Single Point ◽  
Type Locality ◽  
Taxonomic Significance ◽  
Male Tail ◽  
Size And Shape ◽  
Adult Females ◽  
Rectal Glands ◽  
Males And Females

Amendment of the description of males and females of Cephalobus persegnis includes variation in the form of the probolae, reproductive system, and tail, and in the number and position of the lateral papillae on the male tail. Size and shape of the dorsal and subventral rectal glands also differed within and between sexes. Form of the probolae of topotypes and their progeny reared on agar and in sand ranged from low-rounded, when amalgamated with the duplex lips, to asymmetrically bifurcate. Sometimes probolae became conoid in shape, ending in a single point. Significance of the presence or absence and the form of labial probolae in taxonomy of Cephalobus and in its relationships to the Acrobelinae, particularly Chiloplacus Thorne, 1937 and Paracephalobus Akhtar, 1962, is discussed. Chiloplacus trilineatus Steiner, 1940 is synonymized with C. persegnis. Chiloplacus quinilineatus Shavrov, 1968 is transferred to Cephalobus. Configuration of the ovary in adult females is not considered to be of taxonomic significance. The ovary is not always flexed, and, when flexed, the number of flexures varies from one to six. The neotype of C. persegnis was selected from specimens collected from the type locality.

The first description of the male and ephippial female of Dadaya macrops (Daday, 1898) (Cladocera, Chydoridae), with additional notes on this common tropical species

1982 ◽  
Vol 60 (8) ◽  
pp. 1841-1850 ◽  
Author(s):  
R. Rajapaksa ◽  
C. H. Fernando
Keyword(s):  
Population Structure ◽  
Sri Lanka ◽  
Morphological Features ◽  
Type Locality ◽  
Tropical Species ◽  
Monotypic Genus ◽  
Adult Females ◽  
Males And Females ◽  
First Time ◽  
Terminal Claw

Males and ephippial females of Dadaya macrops (Daday), a widely distributed tropical cladoceran, are described for the first time together with hitherto unrecorded morphological features of the parthenogenetic female. The postabdomen of the male is unique among chydorids in having only a vestige of the terminal claw. This confirms the validity of this monotypic genus. The material studied comes from Sri Lanka (Ceylon), taken in the neighbourhood of the type locality. Our description provides a detailed morphological record of a population containing all instars of males and females, and both parthenogenetic and ephippial adult females. Type material of parthenogenetic females, the only forms hitherto known, agrees closely with our material. An analysis of the population structure is given.

scholarly journals A new species of predaceous midge in the Patagonian genus Austrosphaeromias with a redescription of A. chilensis (Diptera, Ceratopogonidae)

2015 ◽  
Vol 105 (1) ◽  
pp. 94-100
Author(s):  
Gustavo R. Spinelli ◽  
María M. Ronderos ◽  
William L. Grogan Jr.
Keyword(s):  
New Species ◽  
Type Species ◽  
Type Locality ◽  
Adult Males ◽  
Andean Region ◽  
Adult Females ◽  
Males And Females ◽  
Key Features ◽  
A New Species ◽  
Unknown Male

A new species of predaceous midge, Austrosphaeromias setosa sp. nov., is described and illustrated from adult males and females collected in the Patagonian-Andean region of Argentina and Chile. Based on examination of the type species of Austrosphaeromias Spinelli, 1997 and recently collected specimens from near the type-locality, the female and previously unknown male of Austrosphaeromias chilensis (Ingram & Macfie, 1931) are also described and illustrated. Descriptions are accompanied by color photographs and illustrations of key features of females and males of both species. We also provide a key to adult females and males of the four species of Austrosphaeromias.

scholarly journals The Reproductive System and Ovarian Development of the Adult Olive Psylla Euphyllurα phillyreαe Foerster (Homoptera: Aphalaridae)

2017 ◽  
Vol 12 ◽  
pp. 37 ◽  
Author(s):  
D. Α. Prophretou-Athanasiadou ◽  
M.E Tzanakakis
Keyword(s):  
Reproductive System ◽  
Ovarian Development ◽  
Size And Shape ◽  
Adult Females ◽  
Olive Psylla

The gross morphology of the reproductive system of adult females and males of the olive psylla Euphyllurα phillyreαe Foerster (Homoptera: Aphalaridae) is given. Five stages of ovarian development are distinguished and described, based on the size and shape of the ovaries and ovarioles, on the separation of the vitellarium from the germarium, and on the appearance and shape of oocytes.

scholarly journals The Waterston’s evaporatorium of Ceraphronidae (Ceraphronoidea, Hymenoptera): A morphological barcode to a cryptic taxon

2021 ◽  
Vol 85 ◽  
pp. 29-56
Author(s):  
Jonah M. Ulmer ◽  
István Mikó ◽  
Andrew R. Deans ◽  
Lars Krogmann
Keyword(s):  
Phylogenetic Analysis ◽  
Potential Function ◽  
Parasitoid Wasp ◽  
Species Level ◽  
Exocrine Gland ◽  
Dorsal Vessel ◽  
Taxonomic Significance ◽  
Character Set ◽  
Males And Females ◽  
First Time

The Waterston’s evaporatorium (=Waterston’s organ), a cuticular modification surrounding the opening of an exocrine gland located on metasomal tergite 6, is characterized and examined for taxonomic significance within the parasitoid wasp family Ceraphronidae. Modification of the abdominal musculature and the dorsal vessel are also broadly discussed for the superfamily Ceraphronoidea, with a novel abdominal pulsatory organ for Apocrita being discovered and described for the first time. Cuticular modification of T6, due to the presence of the Waterston’s evaporatorium, provides a character complex that allows for genus- and species-level delimitation in Ceraphronidae. The matching of males and females of a species using morphology, a long standing challenge for the group, is also resolved with this new character set. Phylogenetic analysis including 19 Waterston’s evaporatorium related characters provides support for current generic groupings within the Ceraphronidae and elaborates on previously suggested synapomorphies. Potential function of the Waterston’s organ and its effects on the dorsal vessel are discussed.

Redescription of Phonotimpus separatus Gertsch & Davis, 1940 (Araneae: Phrurolithidae) and description of two new species of Phonotimpus from Mexico

Zootaxa ◽  
2018 ◽  
Vol 4407 (2) ◽  
pp. 213 ◽  
Author(s):  
DAVID CHAMÉ-VÁZQUEZ ◽  
GUILLERMO IBARRA-NÚÑEZ ◽  
MARIA LUISA JIMÉNEZ
Keyword(s):  
New Species ◽  
Type Species ◽  
Type Locality ◽  
Two New Species ◽  
Males And Females

The female of Phonotimpus separatus Gertsch & Davis (the type species of the genus) is redescribed from a specimen collected at the type locality, and two new species of Phonotimpus from Mexico are described: P. pennimani sp. nov. and P. talquian sp. nov. A more detailed description of P. separatus is provided to better distinguish them from related taxa. The two new species are closely related; males and females of both species share several somatic and genitalic characters not found in P. separatus. The resemblance of both new species to P. separatus is discussed. 

scholarly journals Morphometric Correlates of Age and Breeding Status in American Coots

The Auk ◽  
1987 ◽  
Vol 104 (4) ◽  
pp. 640-646 ◽  
Author(s):  
Ray T. Alisauskas
Keyword(s):  
Body Size ◽  
Multivariate Techniques ◽  
Same Sex ◽  
Linear Measurements ◽  
Morphometric Variation ◽  
Size And Shape ◽  
Multivariate Dispersion ◽  
Age Related ◽  
The Social ◽  
Males And Females

Abstract I studied morphometric variation in 13 linear measurements from 228 American Coots (Fulica americana) collected in southern Manitoba. Univariate and multivariate techniques revealed differences in size and shape among adult coots that were 1, 2, and =2 yr old. In addition to the obvious differences in size between males and females, the morphometry of older birds differed from that of younger birds in two ways. First, older coots were of larger body size than younger coots of the same sex. Second, older coots had proportionately larger feet and claws relative to the size of their tarsi, and proportionately wider bills and heads relative to other head measurements, than did younger birds. Multivariate dispersion matrices within age/sex cohorts were less variable for older coots. In an analysis of 1-yr-old males, breeders did not differ from nonbreeders in overall body size, but breeders had relatively longer claws and wings than nonbreeders. Age-related differences in morphology may have relevance to the social structure of nesting coots, which involves highly aggressive territorial behavior. Part of the age-related variation in nesting phenology that has been documented elsewhere for coots may be a consequence of covariation in body size and shape.

scholarly journals Variation in Chin and Mandibular Symphysis Size and Shape in Males and Females: A CT-Based Study

2020 ◽  
Vol 17 (12) ◽  
pp. 4249
Author(s):  
Tatiana Sella Tunis ◽  
Israel Hershkovitz ◽  
Hila May ◽  
Alexander Dan Vardimon ◽  
Rachel Sarig ◽  
...  
Keyword(s):  
Sexual Selection ◽  
Anatomical Landmark ◽  
Anatomical Structure ◽  
Sexually Dimorphic ◽  
Selection Theory ◽  
Size And Shape ◽  
Size Index ◽  
Sexual Selection Theory ◽  
Males And Females ◽  
Anthropological Literature

The chin is a unique anatomical landmark of modern humans. Its size and shape play an important role from the esthetic perspective. However, disagreement exists in the dental and anthropological literature regarding the sex differences in chin and symphysis morphometrics. The “sexual selection” theory is presented as a possible reason for chin formation in our species; however, many other contradictory theories also exist. This study’s aims were therefore to determine how chin and symphysis size and shape vary with sex, and to discuss “sexual selection” theory as a reason for its formation. Head and neck computed tomography (CT) scans of 419 adults were utilized to measure chin and symphysis sizes and shapes. The chin and symphysis measures were compared between the sexes using an independent-samples t-test, a Mann–Whitney test, and the F-statistic. The chin width was significantly greater in males than in females (p < 0.001), whereas the chin height, area, and size index were significantly greater in females (p < 0.001). Symphysis measures did not differ significantly between the sexes. Size accounted for 2–14% of the chin variance and between 24–33% of the symphysis variance. Overall, the chin was found to be a more heterogeneous anatomical structure than the symphysis, as well as more sexually dimorphic.

scholarly journals Natural history of Ctenus medius Keyserling, 1891 (Araneae, Ctenidae) I: observations on habitats and the development of chromatic patterns

2000 ◽  
Vol 60 (3) ◽  
pp. 503-509 ◽  
Author(s):  
C. E. ALMEIDA ◽  
E. F. RAMOS ◽  
E. GOUVÊA ◽  
M. do CARMO-SILVA ◽  
J. COSTA
Keyword(s):  
Life Cycle ◽  
Natural History ◽  
National Park ◽  
Common Species ◽  
Field Observations ◽  
Mata Atlântica ◽  
Adult Females ◽  
History Of ◽  
Males And Females ◽  
Phoneutria Nigriventer

Ctenus medius Keyserling, 1891 is a common species in several spots of Mata Atlântica, however there is a great lack of studies in all aspects of its natural history. This work aims to elucidate aspects of ecotope preference compared to large spiders, and to provide data on the development of chromatic patterns during its life cycle. The observations on the behavior of C. medius were done in the campus of Centro Universitário de Barra Mansa (UBM) by means of observations and nocturnal collections using cap lamps. For observations on the development of chromatic patterns, spiderlings raised in laboratory, hatched from an oviposition of a female from campus of UBM, and others spiderlings collected in field were used. The field observations indicate that: C. medius seems to prefer ecotopes characterized by dense shrub vegetation or herbal undergrowth; Lycosa erythrognatha and L. nordeskioldii seems to prefer open sites; Phoneutria nigriventer seems to prefer shrub vegetation and anthropogenic ecotopes as rubbish hills; Ancylometes sp. seems to prefer ecotopes near streams. Concerning chromatic patterns, it was observed that males and females show well distinct patterns during the last two instars, allowing distinction by sex without the use of a microscope. Through chromatic patterns it was also possible to draw a distinction between C. medius and C. ornatus longer that 3 mm cephalothorax width. 69 specimens of C. medius (males and females) collected in the campus of UBM did not show a striking polymorphism in chromatic pattern, but one among 7 adult females collected in National Park of Itatiaia, showed a distinct chromatic pattern.

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