Population features, sexual dimorphism and handedness of the primary freshwater crab Trichodactylus cf. fluviatilis (Brachyura: Trichodactylidae) from southeastern Brazil

2019 ◽  
Vol 64 (2) ◽  
pp. 95-105
Author(s):  
Régis Augusto Pescinelli ◽  
Fernando Luis Mantelatto ◽  
Rogerio Caetano Costa
Keyword(s):  
Sexual Dimorphism ◽  
Southeastern Brazil ◽  
Freshwater Crab

scholarly journals Sexual maturity, handedness and sexual dimorphism of the freshwater crab Dilocarcinus pagei in Southeastern Brazil

2016 ◽  
Vol 42 (3) ◽  
pp. 269-279 ◽  
Author(s):  
Thiago Maia DAVANSO ◽  
◽  
Fabiano Gazzi TADDEI ◽  
Gustavo Luis HIROSE ◽  
Rogerio Caetano COSTA
Keyword(s):  
Sexual Dimorphism ◽  
Sexual Maturity ◽  
Southeastern Brazil ◽  
Freshwater Crab ◽  
Dilocarcinus Pagei

scholarly journals Reproductive biology and feeding of Curimatella lepidura (Eigenmann & Eigenmann) (Pisces, Curimatidae) in Juramento reservoir, Minas Gerais, Brazil

2006 ◽  
Vol 23 (2) ◽  
pp. 314-322 ◽  
Author(s):  
Érika R. de Alvarenga ◽  
Nilo Bazzoli ◽  
Gilmar B. Santos ◽  
Elizete Rizzo
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Biology ◽  
Sexual Maturation ◽  
Nutrient Recycling ◽  
Reproductive Activity ◽  
Feeding Habit ◽  
Southeastern Brazil ◽  
Short Rainy Season ◽  
Probable Role ◽  
Energetic Reserves

Reproductive biology and feeding of Curimatella lepidura (Eigenmann & Eigenmann, 1889) were studied in Juramento reservoir, São Francisco River basin, Southeastern Brazil. Histological analyses and gonadosomatic indexes revealed females and males in reproductive activity from October to March and total spawning occurring from January to March coupled with the peak of spermiating males. In the dry season, the fishes accumulated energetic reserves for reproduction during a short rainy season. The species presented sexual dimorphism, being females larger than males and sexual maturation occurring close to 7.7 cm standard length for females and 7.1 cm for males. C. lepidura presented iliophagous feeding habit, ingesting mainly sediment/detritus and a small amount of acari, algae, Tricoptera insects and Ostracoda crustaceans, suggesting a probable role in nutrient recycling of the Juramento reservoir.

scholarly journals Morphology of the franciscana (Pontoporia blainvillei) off southeastern Brazil: sexual dimorphism, growth and geographic variation

2002 ◽  
Vol 1 (1) ◽  
Author(s):  
R. M. A. Ramos ◽  
A. P. M. Di Beneditto ◽  
S. Siciliano ◽  
M. C. O. Santos ◽  
A. N. Zerbini ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Geographic Variation ◽  
Southeastern Brazil ◽  
Pontoporia Blainvillei

scholarly journals Population dynamics of the freshwater crab Dilocarcinus pagei in tropical waters in southeastern Brazil

2013 ◽  
Vol 33 (2) ◽  
pp. 235-243 ◽  
Author(s):  
Thiago Maia Davanso ◽  
Sabrina Morilhas Simões ◽  
Adilson Fransozo ◽  
Rogerio Caetano da Costa ◽  
Fabiano Gazzi Taddei
Keyword(s):  
Population Dynamics ◽  
Southeastern Brazil ◽  
Freshwater Crab ◽  
Tropical Waters ◽  
Dilocarcinus Pagei

scholarly journals Body size, female reproduction and sexual dimorphism in the lizard Ameiva ameiva (Teiidae) in a restinga of southeastern Brazil

2008 ◽  
Vol 25 (2) ◽  
pp. 370-372 ◽  
Author(s):  
Carlos Frederico Duarte Rocha
Keyword(s):  
Body Size ◽  
Sexual Dimorphism ◽  
Clutch Size ◽  
Reproductive Period ◽  
Southeastern Brazil ◽  
Head Width ◽  
Sexually Dimorphic ◽  
Female Reproduction ◽  
Female Body Size ◽  
Reproductive Body

In this study 57 specimens of the lizard Ameiva ameiva (Linnaeus, 1758) collected in the restinga at Barra de Maricá, in the state of Rio de Janeiro, southeastern Brazil, were analyzed to investigate size relations and reproduction (in females) and sexual dimorphism of this population. We answered the following questions: 1) what is the minimum reproductive body size in females? 2) what is the average clutch size and 3) how is clutch size related to body size? 4) Are body and head sizes sexually dimorphic? Mean clutch size was 6.7 ± 2.1 eggs and was positively correlated with female body size. Sexual dimorphism favoring males was found: adult mean snout-vent length was great in males (124.2 ± 17.8 mm) than females (96.5 ± 23.1 mm SVL), and males were larger with respect to head width and length, and body mass. Thus, despite the marked seasonality at Barra de Maricá, A. ameiva has an extended reproductive period. Also, intrasexual selection may have acted on females to produce larger clutches, and on males, favoring larger males.

Juvenile development of Dilocarcinus pagei Stimpson, 1861 (Brachyura, Trichodactylidae) reared in the laboratory, with emphasis on setae morphology

Crustaceana ◽  
2013 ◽  
Vol 86 (13-14) ◽  
pp. 1644-1663 ◽  
Author(s):  
Rony R. R. Vieira ◽  
Paulo J. Rieger ◽  
Viviane Cichowski ◽  
Marcelo A. A. Pinheiro
Keyword(s):  
Sexual Dimorphism ◽  
Water Hyacinth ◽  
Morphological Characters ◽  
Juvenile Stage ◽  
Freshwater Crab ◽  
The Third ◽  
Laboratory Conditions ◽  
Juvenile Stages ◽  
Juvenile Development ◽  
Dilocarcinus Pagei

The juvenile development of the freshwater crab Dilocarcinus pagei Stimpson, 1861 was studied under laboratory conditions, focusing on setae morphology. The ovigerous females were collected manually associated with water hyacinth at the Municipal Dam of São José do Rio Preto (São Paulo, Brazil). The specimens were raised in the laboratory under constant aeration, photoperiod (12 : 12 h) and temperature (27 ± 1°C). Twelve juvenile stages were obtained with descriptions of the main morphological characters that allow their identification are presented. Fourteen types of setae were discovered: dentate, denticulate, serrulate, papposerrate, cuspidate, plumose, plumodenticulate, plumoserrulate, simple, pappose, brush, curved, nail and setules. The greatest diversity of setae was found on the mouth appendages, especially the maxillule. The gill ontogeny and sexual dimorphism becomes apparent from the second juvenile stage onwards. At the third juvenile stage, the carapace begins to exhibit a wider shape, becoming similar to that of the adults.

scholarly journals Sexual dimorphism in Amphisbaena nigricauda (Reptilia, Squamata, Amphisbaenidae) from Southeastern Brazil

2014 ◽  
Vol 104 (3) ◽  
pp. 299-307 ◽  
Author(s):  
Francco A. N. de Souza e Lima ◽  
João Luiz Gasparini ◽  
Antonio de Padua Almeida ◽  
Marcos V. C. Vital ◽  
Tamí Mott
Keyword(s):  
Body Size ◽  
Sexual Dimorphism ◽  
Morphological Characters ◽  
The Body ◽  
Southeastern Brazil ◽  
Meristic Characters ◽  
Single Male ◽  
Posterior Portion ◽  
Espírito Santo ◽  
Espirito Santo

Amphisbaena nigricauda Gans, 1966 is a small, poorly known amphisbaenid endemic to the restinga of the states of Espírito Santo and Bahia, Brazil. We analyze 178 specimens collected in Vitória municipality, state of Espírito Santo, Brazil, to investigate whether this species show sexual dimorphism in pre-cloacal pores and in morphological characters. Sex was determined by a ventral incision and direct inspection of gonads. A PCA analysis was performed to generate a general body size measurement. A T test and the non-parametric Mann-Whitney test were used to assess whether this species show sexual dimorphism on five morphometric and five meristic characters, respectively. Sex could not be determined in 36 specimens because they were mutilated in the posterior portion of their bodies. The diagnosis of the species is redefined based on this sample size: the smallest number of body annuli changes from 222 to 192, the number of dorsal and ventral segments in an annulus in the middle of the body changes to 9-11/13-16 (instead of 10/16), and the autotomic tail annulus lies between annulus 7-10 (instead of 6-9). The number of tail annuli remained within the known range of variation of the species (19-24). None of the 80 females analyzed showed pre-cloacal pores, whereas within males 59 out of 62 specimens displayed four and two specimens displayed five pre-cloacal pores. A single male did not possess pre-cloacal pores, but showed irregular scales on its cloacal region. Sex-based difference based on presence or absence of pre-cloacal pores as well as males with wider head was seen in other Neotropical amphisbaenids. However, a pattern of body size differences between males and females has not been identified so far in the few amphisbaenid species studied in this regard. Further studies on this taxonomic group are still needed to elucidate the existence of general patterns of sexual dimorphism and to identify the selective pressures driving these patterns.

A remarkable new species of flesh-fly mimicking weevil (Coleoptera: Curculionidae: Conoderinae) from Southeastern Brazil

Zootaxa ◽  
2012 ◽  
Vol 3413 (1) ◽  
pp. 55 ◽  
Author(s):  
SERGIO A. VANIN ◽  
TADEU J. GUERRA
Keyword(s):  
New Species ◽  
Sexual Dimorphism ◽  
The Other ◽  
Southeastern Brazil ◽  
Serra Do Cipó ◽  
The Family ◽  
History Of ◽  
Species Type ◽  
And Behavior ◽  
Flesh Flies

Timorus sarcophagoides, new species (type-locality: Brazil, Minas Gerais, Santana do Riacho - Serra do Cipó, 43o35'W 19o17'S, 1200–1300m ASL), is described and illustrated. The new species can be distinguished mainly from the other species of the genus by the sexual dimorphism of the male rostrum armed with a hooked tubercle at the base of the dorsal carina, while the tubercle is absent in the female and the corresponding region of the carina is only tumid. The new species has a striking pattern of coloration and behavior that mimics flesh-flies in the family Sarcophagidae. Observations on the natural history of the new species are reported and discussed.

A remarkable new species of Multumbo showing sexual dimorphism, with the transfer of Multumbo and Piassagera to the Hernandariinae  (Opiliones, Gonyleptidae)

Zootaxa ◽  
2007 ◽  
Vol 1558 (1) ◽  
pp. 29-37 ◽  
Author(s):  
MARCIO B. DASILVA ◽  
ADRIANO B. KURY
Keyword(s):  
New Species ◽  
Sexual Dimorphism ◽  
Rio De Janeiro ◽  
Type Species ◽  
New Records ◽  
Southeastern Brazil ◽  
Monotypic Genus ◽  
Complex Scenario ◽  
A New Species ◽  
Janeiro State

A new species of Multumbo Roewer, 1927 (Gonyleptidae: Hernandariinae), M. dimorphicus sp. nov., is described from Rio de Janeiro state, southeastern Brazil. It presents sexual dimorphism in leg IV, contrasting remarkably with the type species of the hitherto monotypic genus Multumbo and the closest genera (Piassagera Roewer, 1928 and Pseudotrogulus Roewer, 1932), which were all thought to have lost this dimorphism. The presence of sexual dimorphism in M. dimorphicus implies a complex scenario of loss or reversal of this character. New records are given of type species of genus, Multumbo terrenus Roewer, 1913, for which a lectotype is designated. New diagnoses are provided for Hernandariinae and Multumbo. Multumbo and Piassagera are transferred from the Gonyleptinae to the Hernandariinae.Uma nova espécie de Multumbo Roewer, 1927, M. dimorphicus sp. nov., é descrita do estado do Rio de Janeiro. Ela apresenta dimorfismo sexual na perna IV, condição em notável contraste com a espécie-tipo do até então gênero monotípico Multumbo e com os gêneros mais relacionados, Piassagera Roewer, 1928 e Pseudotrogulus Roewer, 1932, nos quais esse dimorfismo era considerado como perdido. A presença de dimorfismo sexual em M. dimorphicus sugere um complexo cenário de perda ou reversão desse dimorfismo. Também foram incluídos novos registros da espécie-tipo do gênero, Multumbo terrenus Roewer, 1913, e um lectótipo é designado. Novas diagnoses para Hernandariinae and Multumbo são apresentadas. Multumbo e Piassagera são aqui transferidos de Gonyleptinae para Hernandariinae.

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