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 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.

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.

A new fossil Eurypinae genus and sexual dimorphism in the representatives of Omineus (Coleoptera: Mycteridae) from Tertiary amber of Europe

Zootaxa ◽  
2020 ◽  
Vol 4820 (3) ◽  
pp. 551-562
Author(s):  
VITALII IGOREVICH ALEKSEEV ◽  
ANDRIS BUKEJS ◽  
DARREN ANDREW POLLOCK
Keyword(s):  
Computed Tomography ◽  
Sexual Dimorphism ◽  
Baltic Amber ◽  
Micro Computed Tomography ◽  
Fossil Species ◽  
X Ray ◽  
Secondary Sexual Characters ◽  
Kaliningrad Region ◽  
First Time ◽  
Secondary Sexual

Europoeurypus inglaeso gen. et sp. nov. is described from Eocene Baltic amber found on the Sambian Peninsula, Kaliningrad Region, Russia. Four additional specimens of mycterid beetles from collections of Baltic amber are reported. The secondary sexual characters and sexual dimorphism in the Eocene representatives of the genus Omineus Lewis, 1895 are documented for the first time and examined using X-ray micro-computed tomography (μCT). The studied Omineus male specimens were attributed to the fossil species Omineus febribilis Alekseev, Pollock & Bukejs, 2019. A key to fossil species of Eurypinae from Eocene ambers is provided and several aspects of the biogeography of the subfamily Eurypinae are discussed.

First description of male and immatures in mite genus Dasythyreus (Acari: Dasythyreidae)

Zootaxa ◽  
2020 ◽  
Vol 4857 (1) ◽  
pp. 196-214
Author(s):  
ALEXANDER A. KHAUSTOV
Keyword(s):  
Sexual Dimorphism ◽  
Western Siberia ◽  
Spruce Bark ◽  
First Time ◽  
Mite Genus

The male and immatural Dasythyreus polytrichus Khaustov and Abramov, 2010 (Acari: Dasythyreidae), collected from spruce bark in Western Siberia, Russia are described for the first time in the genus. Sexual dimorphism and leg setal development in this species are discussed. 

Three Echiniscidae species (Tardigrada: Heterotardigrada) new to the Polish fauna, with the description of a new gonochoristic Bryodelphax Thulin, 1928

Zootaxa ◽  
2018 ◽  
Vol 4410 (1) ◽  
pp. 77 ◽  
Author(s):  
PIOTR GĄSIOREK ◽  
PETER DEGMA
Keyword(s):  
Sexual Dimorphism ◽  
Original Description ◽  
European Countries ◽  
Tatra Mountains ◽  
Xxth Century ◽  
Mountain Ranges ◽  
Α Diversity ◽  
Taxonomic Importance ◽  
The Tatra Mountains ◽  
First Time

During a faunistic survey in the Pieniny and Tatra Mountains three species of Echiniscidae new to Poland, including one new to science, were found. Bryodelphax instabilis sp. nov. is characterised by an instable number of ventral plates, deep faceting of the scapular plate, having dorsal plates covered either with pseudopores or pores, and striking sexual dimorphism. Two first records, namely Echiniscus militaris and E. spiniger, are rare taxa of upland-mountain character, which have already been reported from a few European countries since the original description at the beginning of the XXth century. The interspecific appendage length variability and development of pedal plates in the spinulosus group, to which E. spiniger belongs, and their taxonomic importance is discussed. Notes relating to sexual dimorphism within the newly recorded Pseudechiniscus facettalis, are also presented. Echiniscus testudo is reported from the Polish part of the Tatra Mountains for the first time. Succeeding findings confirm the high tardigrade α-diversity in the Polish mountain ranges. An amended key for Polish Heterotardigrada is provided. 

scholarly journals Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand

2013 ◽  
Author(s):  
Daniel Leduc
Keyword(s):  
New Species ◽  
New Zealand ◽  
Sexual Dimorphism ◽  
Continental Slope ◽  
Buccal Cavity ◽  
Posterior Extremity ◽  
New Genera ◽  
Posterior Testis ◽  
The Family ◽  
First Time

Two new genera and five new species of Selachinematidae are described from the New Zealand upper continental slope (350-1240 m depth). Synonchiella rotundicauda sp. nov. is characterised by cephalic setae 0.25 cbd long, mandibles each with two pairs of hooks and two wing-like projections laterally, eight cup-shaped pre-cloacal supplements and short rounded tail. Pseudocheironchus gen. nov. is similar to Cheironchus, but differs from the latter in having a cuticle without lateral differentiation, cephalic setae only slightly longer than the outer labial sensillae, and a posterior buccal cavity with three equal mandibles. Pseudocheironchus ingluviosus gen. et sp. nov. is characterised by mandibles with eight blunt teeth, multispiral amphideal fovea with five turns, and a short rounded tail. Males of this new species with 17-19 cup-shaped pre-cloacal supplements. Males of the genus Cobbionema are described for the first time; C. trigamma sp. nov. is characterised by four long cephalic setae and six smaller outer labial setae in one circle, six rhabdions surrounding the anterior buccal cavity, each with two pairs of pointed projections at their posterior extremities, posterior buccal cavity widening posteriorly, with three pairs of rhabdions fused posteriorly and widening anteriorly, males with two testes pointing anteriorly and with reflexed posterior testis, and no pre-cloacal supplements. Gammanema agglutinans sp. nov. is characterised by a short, stout body often covered in adhering mucus and detritus, cuticle with minute spines, leaf-shaped somatic setae with ducts, sexual dimorphism in the shape of the amphideal fovea (loop-shaped in males and spiral in females), posterior buccal cavity with three pairs of broad, column-shaped rhabdions fused anteriorly, intestine cells with orange-brown granules, and small tubular pre-cloacal supplements. Bendiella gen. nov. is most similar to Halichoanolaimus, but differs from the latter, and all other genera of the family Selachinematidae, in having a cuticle with lateral differentiation consisting of longitudinal rows of larger dots, and from all other genera of the Choniolaiminae in lacking pre-cloacal supplements. Bendiella thalassa gen. et sp. nov. is characterised by amphideal fovea with 5.25 turns, anterior buccal cavity with twelve rhabdions, each with a pair of pointed projections at posterior extremity, posterior buccal cavity with three Y-shaped pairs of slender rhabdions fused from two thirds of distance from anterior ends, and conico-cylindrical tail.

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