BARCELONA have reportedly decided the fate of Marcus Rashford beyond the summer. The Manchester United attacker, 28, is on loan for the campaign at the La Liga giants with an option to make the dea...
BARCELONA have reportedly decided the fate of Marcus Rashford beyond the summer. The Manchester United attacker, 28, is on loan for the campaign at the La Liga giants with an option to make the deal permanent for around £26million. Hansi Flick has been impressed by the England international who has offered 18 goal contributions in...
The CarbSAR satellite, using a uniquely crafted knitted radar antenna, is set to transform Earth observation by offering precise, cost-effective solutions for monitoring the planet's surface.
Topics:
space
earth observation
technology
monitoring earth
knitted satellite
science
Hemitrygon ariakensis Furumitsu & Yamaguchi, 2025. DOI: doi.org/10.1007/s10228-025-01048-5 Researchgate.net/publication/398875566AbstractWe redescribe ...
Hemitrygon ariakensis Furumitsu & Yamaguchi, 2025. DOI: doi.org/10.1007/s10228-025-01048-5 Researchgate.net/publication/398875566AbstractWe redescribe Hemitrygon akajei (Bürger in Müller and Henle 1841) based on the lectotype and newly collected specimens, and describe Hemitrygon ariakensis sp. nov. from western Japan. Owing to their considerable morphological similarity and sympatric distribution, these two species have been subject to longstanding taxonomic confusion, with one remaining unrecognized as a cryptic species for over 160 years prior to the availability of molecular evidence. The red stingray H. akajei was originally described from six syntypes, including juveniles that likely represented multiple species, including the cryptic one. Species identification in Hemitrygon is complicated not only by interspecific morphological resemblance but also by marked ontogenetic changes between juveniles and adults. Herein, we describe the external morphology of both species across developmental stages to aid in their distinction. Hemitrygon akajei and Hemitrygon ariakensis sp. nov. can be distinguished by the following combination of characters: arrangement of denticles on dorsal surface of disc and posterior part of tail; shape, size, and arrangement of thorns on dorsal tail anterior to caudal spine; presence or absence of transverse groove on ventral surface of disc; coloration of ventral tail fold; shape of outer marginal color band on ventral disc; morphology of clasper and prepelvic processes of pelvic girdle; and number of prespine separate centra. Stingrays are important fishery resources and key mesopredators in Japanese coastal ecosystems, influencing populations of other fishery species. The ability to distinguish these two species will facilitate more accurate ecological research, inform species-specific conservation strategies, and promote effective biodiversity management. Such taxonomic resolution is essential for understanding coastal ecosystem dynamics. Keywords: Taxonomy, New species, Cryptic species, Western Japan, Ariake BayFresh specimens of Hemitrygon ariakensis sp. nov.a, b Holotype (FFNU-P-02129, 363.3 mm DW, male, mature); c, d paratype (FFNU-P-02126, 154.4 mm DW, male, immature); e, f paratype (FFNU-P-02141, 545.1 mm DW, female, mature). a, c, e Dorsal view; b, d, f ventral view. Scales indicate 50 mmIllustrations originally considered Hemitrygon akajei; herein reidentified as Hemitrygon ariakensis sp. nov. based on the morphological characters depicted.a Original illustration from Bürger’s unpublished manuscript (No. 13; RMNH.ART.256, courtesy of Naturalis Biodiversity Center, CC0 1.0), b illustration from the original description in Müller and Henle (1841), c illustration from the Glover Atlas, illustrated by Hagiwara (1915), in the collection of Nagasaki University Library. Keisuke Furumitsu and Atsuko Yamaguchi. 2025. Redescription of Hemitrygon akajei with Description of the cryptic stingray species Hemitrygon ariakensis sp. nov. from the Northwest Pacific (Myliobatoidei: Dasyatidae). Ichthyological Research. DOI: doi.org/10.1007/s10228-025-01048-5 [19 December 2025] Researchgate.net/publication/398875566_Redescription_of_Hemitrygon_akajei_with_description_of_Hemitrygon_ariakensis_sp_nov_from_the_Northwest_Pacific
Topics:
redescription
'open access'
2026
chondrichthyes - cartilaginous fishes
cryptic species
dasyatidae
elasmobranchii
ichthyology - fish
japan
marine
Trump's aggressive geopolitical strategy has destabilised authoritarian regimes across the Middle East and beyond, forcing dictators into exile and reigniting hope for millions under oppressive rul...
Trump's aggressive geopolitical strategy has destabilised authoritarian regimes across the Middle East and beyond, forcing dictators into exile and reigniting hope for millions under oppressive rule — but what comes next remains uncertain.
Topics:
world
crisis
diplomacy
strategy
absolute resolve
unilateral
science
NASA is returning four astronauts to Earth early from the International Space Station due to a medical concern with one of the Crew-11 astronauts. Here's the latest ne...
NASA is returning four astronauts to Earth early from the International Space Station due to a medical concern with one of the Crew-11 astronauts. Here's the latest news.
Topics:
missions
space exploration
international space station
commander
evacuation
medical
astronaut
iss
science