scholarly journals Sexual Dimorphism in Aegisthid Cephalosomic Appendages (Copepoda, Harpacticoida): A Reappraisal

1988 ◽  
Vol 58 (1) ◽  
pp. 114-136 ◽  
Author(s):  
Rony Huys
Keyword(s):  
Sexual Dimorphism ◽  
Sexual Differences ◽  
Monophyletic Group ◽  
Pedigerous Somite ◽  
First Time ◽  
Caudal Rami

The cephalosomic appendages, including the rostrum, are redescribed in the bathypelagic harpacticoid Aegisthus mucronatus Giesbrecht, 1891 (Aegisthidae). Profound sexual dimorphism was found in all cephalosomic appendages. For the first time reference is made to the presence of a mandible in the male and figures are given for the male maxillula. Distinct sexual differences are also observed in the structure of the labrum and the labium. The structure and ornamentation of the male antennula clearly shows that the Aegisthidae belong to the monophyletic group Cervinioidea, including also the Rotundiclipeidae and Cerviniidae. Brief comments are made on the nature of the first pedigerous somite, the structure of the anal somite and of the caudal rami. The occurrence of sexual dimorphism in postantennular cephalosomic appendages of harpacticoids is reviewed.

THE SPEAR LOBSTER, LINUPARUS SOMNIOSUS BERRY & GEORGE, 1972 (DECAPODA, PALINURIDAE) IN INDONESIA

Crustaceana ◽  
1999 ◽  
Vol 72 (7) ◽  
pp. 673-684 ◽  
Author(s):  
Daisy Wowor
Keyword(s):  
Sexual Dimorphism ◽  
Southeast Asia ◽  
Shallow Waters ◽  
Dimorphisme Sexuel ◽  
First Time

AbstractABSTRACT The spear lobster, Linuparus somniosus Berry & George, 1972 (Palinuridae), is here reported for the first time from relatively shallow waters off southern Java, Indonesia. This is only the second time that the species is recorded from Southeast Asia. Sexual dimorphism in the pereiopods is reported: those of males being more robust than those of females. Several other taxonomic characters are also discussed. Notes on the local fisheries for this species are provided. Linuparus somniosus Berry & George, 1972 (Palinuridae) est signale pour la premiere fois d'eaux relativement peu profondes au sud de Java (Indonesie); c'est la seconde fois seulement que l'espece est signalee du Sud-est de l'Asie. Le dimorphisme sexuel des pereiopodes est mentionne, ceux du male etant plus robustes que ceux de la femelle. D'autres caracteres taxonomiques sont aussi discutes. Des notes sur les pecheries locales de cette espece sont fournies.

scholarly journals On two species of Riocypris (Crustacea, Ostracoda) from northern Patagonia and their relation to Eucypris fontana: implications in paleoenvironmental reconstructions

2018 ◽  
Vol 96 (8) ◽  
pp. 801-817 ◽  
Author(s):  
C.A. Coviaga ◽  
A.P. Pérez ◽  
L.Y. Ramos ◽  
P. Alvear ◽  
G.C. Cusminsky
Keyword(s):  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Indicator Species ◽  
Taxonomic Status ◽  
Geometric Morphometric ◽  
Comparative Analyses ◽  
Northern Patagonia ◽  
Geometric Morphometric Analysis ◽  
The Individual ◽  
First Time

Two species of ostracods new to Patagonia, Argentina, are described. One of them, Riocypris whatleyi sp. nov., is described for the first time, and the second, Riocypris sarsi (Daday, 1902) comb. nov., is reallocated from genus Eucypris to genus Riocypris. Inter- and intra-specific variations in shape, size, and sexual dimorphism were evaluated based on geometric morphometric analysis. Moreover, morphological and morphometric comparative analyses were applied to re-examine living and quaternary specimens recovered from previous studies. Based on these results, a generic reassignment for the Patagonian Eucypris fontana (Jurine, 1820) into the genus Riocypris is proposed. Contributing to the knowledge on the systematic and autecology of this enigmatic species, widely distributed in Patagonia and frequently used in paleolimnological reconstructions, generates science-based evidence for their use as indicator species. Additionally, our results emphasize the usefulness of studying the living representatives (i.e., with valves and appendages) for elucidating the taxonomic status of the individual specimens, especially those present in paleontological records and used as bioproxies in paleolimnological studies.

Maintenance of endothelial function following acute resistance exercise in females is associated with a tempered blood pressure response

2020 ◽  
Vol 129 (4) ◽  
pp. 792-799 ◽  
Author(s):  
Takuma Morishima ◽  
Jaume Padilla ◽  
Yosuke Tsuchiya ◽  
Eisuke Ochi
Keyword(s):  
Blood Pressure ◽  
Sexual Dimorphism ◽  
Endothelial Function ◽  
Resistance Exercise ◽  
Blood Pressure Response ◽  
Pressure Response ◽  
Healthy Male ◽  
Vascular Effects ◽  
First Time ◽  
Female Subjects

The present data demonstrate for the first time that acute resistance exercise impairs endothelial function in young, healthy male but not female subjects. In addition, we show that the preservation of endothelial function in females is associated with a mitigated blood pressure response during resistance exercise. Accordingly, this work portrays a sexual dimorphism in the barostress response, and ensuing vascular effects, to resistance exercise.

Male identification, generic classification and sexual dimorphism of Micronychus pardus (Kazantsev, 2018) comb. nov. (Coleoptera: Lycidae: Calochrominae)

Zootaxa ◽  
2019 ◽  
Vol 4657 (1) ◽  
pp. 177-182 ◽  
Author(s):  
MICHAL MOTYKA
Keyword(s):  
Mitochondrial Dna ◽  
Sexual Dimorphism ◽  
Species Identification ◽  
Dna Sequences ◽  
Morphological Characters ◽  
Molecular Data ◽  
Large Specimen ◽  
Molecular Analyses ◽  
Almost All ◽  
First Time

Almost all net-winged beetles are members of Müllerian complexes and their similarity due to phenotypic coevolution sometimes complicates species identification and generic placement. Therefore, large specimen series, detailed exhaustive examination of morphological characters and molecular data are needed to clarify the taxonomic placement. Using mitochondrial DNA sequences, I investigated the sexual dimorphism and generic placement of the recently described species Calochromus pardus Kazantsev, 2018. I found that the species does not belong in Calochromus Guérin-Méneville, 1833 and all morphological characters and molecular analyses point to its placement in Micronychus Motschulsky, 1861. Therefore, Micronychus pardus (Kazantsev, 2018), comb. nov. is proposed. Additionally, the male is described here for the first time showing the sexual dimorphism in the species. Unlike the females, the males do not superficially resemble members of Xylobanus Waterhouse, 1879 with bright coloured elytral costae and black background, but mimics the sympatrically occurring yellow and black lycids in the genus Cautires Waterhouse, 1879. 

scholarly journals Fine Structure of Maxillary Palps in Adults of Hermetia illucens (Diptera: Stratiomyidae)

2020 ◽  
Author(s):  
M Pezzi ◽  
C Scapoli ◽  
M Bharti ◽  
M J Faucheux ◽  
M Chicca ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Sexual Dimorphism ◽  
Hermetia Illucens ◽  
The Family ◽  
Sensory Structures ◽  
First Time ◽  
Maxillary Palps ◽  
Scanning Electron

Abstract A relevant species in waste management but also in forensic, medical, and veterinary sciences is the black soldier fly, Hermetia illucens (Linnaeus; Diptera: Stratiomyidae). An ultrastructural study by scanning electron microscopy (SEM) was conducted for the first time on maxillary palps of both sexes, describing in detail the morphology and distribution of sensilla and microtrichia. The maxillary palps, composed of two segments, show sexual dimorphism in length and shape. In both sexes, the first segment is covered only by microtrichia, but the second one is divided into two parts: the proximal one, covered only by microtrichia, and the distal one containing both microtrichia and sensory structures. These structures include two types of sensory pits and one of chaetic sensilla. Due to sexual dimorphism in palp size, females have a higher number of sensory pits. The sexual dimorphism of palps and the presence and role of sensilla in H. illucens was discussed in comparison to other species of the family Stratiomyidae and of other Diptera. This study may represent a base for further investigations on mouthpart structures of this species, involved in key physiological activities, such as feeding, mating and oviposition.

Three new ameirid harpacticoids from Korea and first record of Proameira simplex (Crustacea: Copepoda: Ameiridae)

Zootaxa ◽  
2012 ◽  
Vol 3368 (1) ◽  
pp. 91 ◽  
Author(s):  
TOMISLAV KARANOVIC ◽  
JOO-LAE CHO
Keyword(s):  
Species Complex ◽  
Alternative Hypothesis ◽  
First Record ◽  
The South ◽  
The West ◽  
The Pacific ◽  
The World ◽  
South Sea ◽  
First Time ◽  
Caudal Rami

Ameiridae Monard, 1927 was previously known from Korea only after one endemic and four cosmopolitan species of the genus Nitokra Boeck, 1865, and a single widely distributed species of the genus Ameira Boeck, 1865, all from brackish enviroments. After a survey of 22 sampling sites and close to 3,500 harpacticoid specimens from various marine enviroments, we report on two new endemic species of Ameira, A. zahaae sp. nov. and A. kimchi sp. nov., from the West Sea and the South Sea respectively. They are both relatively closely related to the previously recorded cosmopolitan A. parvula (Claus, 1866), but show many novel morphological structures in the caudal rami shape and ornamentation. The identity of the cosmopolitan A. parvula in Korea is questioned, and an alternative hypothesis of a species-complex proposed. The fine ornamentation of body somites (especially the pores/sensilla pattern) is studied in detail, and proves to be a very useful new morphological tool in distinguishing closely related spacies in this genus. The genus Pseudameira Sars, 1911 is reported for the first time in Korea, after four females of P. mago sp. nov. from the South Sea. A single damaged female of Proameira cf. simplex (Norman & Scott, 1905) represents the first record of the genus Proameira Lang, 1944 in Korea, Asia, and anywhere in the Pacific. A key to Korean ameirids is also provided, and their apparent rarity in this part of the world noticed.

scholarly journals Sexual Dimorphism in the Multielemental Stoichiometric Phenotypes and Stoichiometric Niches of Spiders

Insects ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 484
Author(s):  
Łukasz Sobczyk ◽  
Michał Filipiak ◽  
Marcin Czarnoleski
Keyword(s):  
Sexual Dimorphism ◽  
Ecological Stoichiometry ◽  
C:N Ratio ◽  
Sexual Differences ◽  
Nutritional Limitation ◽  
Trade Offs ◽  
Hunting Mode

Nutritional limitations may shape populations and communities of organisms. This phenomenon is often studied by treating populations and communities as pools of homogenous individuals with average nutritional optima and experiencing average constraints and trade-offs that influence their fitness in a standardized way. However, populations and communities consist of individuals belonging to different sexes, each with specific nutritional demands and limitations. Taking this into account, we used the ecological stoichiometry framework to study sexual differences in the stoichiometric phenotypes, reflecting stoichiometric niches, of four spider taxa differing in the hunting mode. The species and sexes differed fundamentally in their elemental phenotypes, including elements beyond those most commonly studied (C, N and P). Both species and sexes were distinguished by the C:N ratio and concentrations of Cu, K and Zn. Species additionally differed in concentrations of Na, Mg and Mn. Phosphorous was not involved in this differentiation. Sexual dimorphism in spiders’ elemental phenotypes, related to differences in their stoichiometric niches, suggests different nutritional optima and differences in nutritional limitation experienced by different sexes and species. This may influence the structure and functioning of spider populations and communities.

Macroscopic sexual dimorphism in Fucus radicans (Phaeophyceae) with implications for its reproductive ecology

2016 ◽  
Vol 59 (6) ◽  
Author(s):  
Ellen Schagerström ◽  
Lena Kautsky
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Ecology ◽  
Macroscopic Scale ◽  
First Time

AbstractSexual dimorphism on a macroscopic scale is unusual within the Phaeophyceae. We report for the first time macroscopic sexual dimorphism in

The Hydroporini (Coleoptera : Dytiscidae : Hydroporinae) of New Guinea: Systematics, distribution and origin of the fauna

1995 ◽  
Vol 9 (5) ◽  
pp. 1009 ◽  
Author(s):  
M Balke
Keyword(s):  
Papua New Guinea ◽  
New Guinea ◽  
Monophyletic Group ◽  
Sister Species ◽  
Additional Material ◽  
Seasonal Climate ◽  
Open Forests ◽  
First Time

Only one species of Hydroporini, Megaporus piceatus (RCgimbart, 1892), has been known from New Guinea. M. piceatus is very similar to the Australian M. ruficeps (Sharp, 1882) and study of additional material is neccessary to determine its status. Chostonectes maai, sp. nov., is described from Papua New Guinea. Its sister-species is the Australian C. gigas (Boheman, 1858). The classification of the genera Megaporus Brinck, 1943, and Chostonectes Sharp, 1882, is discussed, and autapomorphies for both groups are suggested. The following species of Hydroporini are reported from New Guinea for the first time: Megaporus sp., Antiporus sp., and Sternoprisccts hansardi (Clark, 1862). A total of five Hydroporini species is now known from New Guinea. All are Australian, or of Australian origin. The New Guinean Hydroporini are not a monophyletic group. The factors delimiting the distribution of Hydroporini in New Guinea are climate and perhaps also vegetation. Australian Hydroporini are adapted to a seasonal climate and most of them also to open forests/woodland.

First record of the tribe Diglottini from South America with description of Diglotta brasiliensis n. sp. (Coleoptera, Staphylinidae, Aleocharinae)

Zootaxa ◽  
2008 ◽  
Vol 1776 (1) ◽  
pp. 52 ◽  
Author(s):  
EDILSON CARON ◽  
CIBELE STRAMARE RIBEIRO-COSTA
Keyword(s):  
New Species ◽  
New Zealand ◽  
Sexual Dimorphism ◽  
South America ◽  
First Record ◽  
Southern Brazil ◽  
Rove Beetle ◽  
Fiji Islands ◽  
First Time ◽  
A New Species

The tribe Diglottini Eichelbaum, 1909 comprises two halophilous rove beetle genera Diglotta Champion, 1899, and Paradiglotta Ashe & Ahn, 2004. The tribe contains eight known species distributed in the Nearctic and West-Palaearctic regions, and also Fiji Islands and New Zealand. This tribe is recorded for the first time from South America with the description of a new species, Diglotta brasiliensis n. sp. from southern Brazil (Paraná). Characters of the mouthparts, aedeagus and spermatheca of the new species are illustrated and compared with other Diglotta species. Sexual dimorphism is reported for the first time in the genus.

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