A First Chromosomal and Nucleolar Organizer Regions (NORs) Analyses of Chevey’s Sheetfish, <i>Micronema cheveyi</i> (Siluriformes, Siluridae)

Abstract

A first report on nucleolar organizer regions (NORs) and karyological analyses in the Chevey s sheetfish (Micronema cheveyi) from the Chao Phraya Basin, Thailand, was performed. The mitotic chromosome preparation was directly prepared from kidney cells of ten male and eight female specimens. Conventional staining and Ag-NOR banding techniques were applied to stain the chromosomes. The results shown that the diploid chromosome number of M. cheveyi was 2n=78 and the fundamental numbers (NF) were 96 in both sexes. The karyotype composed of 4 large metacentric, 6 large submetacentric, 10 large acrocentric, 32 medium telocentric, and 26 small telocentric chromosomes. No heteromorphic sex chromosomes were revealed. In addition, the telomeric NORs were clearly observed at the short arm adjacent to the telomere of the third chromosome pair (submetacentric chromosomes). The karyotype formula for M. cheveyi is as follows: m sm a t t 4 6 10 32 26

Comparative cytogenetic analysis of fishes in the genus Trichopodus (Osphronemidae) in Thailand

“…The relative length (RL), the centromeric index (CI), and standard deviation (S.D.) of RL and CI were calculated (Phimphan et al 2013;Pinthong et al 2017;Juntaree and Supiwong 2020). The CI (q/p) between 0.500-0.599, 0.600-0.699, 0.700-0.899, and 0.900-1.000 were described as metacentric (m), submetacentric (sm), acrocentric (a), and telocentric (t) chromosomes, respectively (Saenjundaeng et al 2018a,b;Pissaparn et al 2020;Phimphan et al 2020).…”

History and New Developments on the 90th Anniversary of Cytologia: On the Occasion of the Publication of “Dawn of Modern Wheat Genetics”

“…In Thailand, including Indochina and the northern Malay peninsula, Alongklod Tanomtong and coworkers have recently focused on fish karyotype analysis and have published 15 reports in Cytologia over the last 2 years on the following fish species: Humpback cardinalfish, Fibramia lateralis (Kasiroek et al 2017a); Banggai cardinalfish, Pterapogon kauderni (Kasiroek et al 2017b); triangle butterflyfish, Chaetodon triangulum and yellow butterflyfish, C. andamanensis (Supiwong et al 2017a); Indian vagabond butterflyfish, Chaetodon decussatus and Lined butterflyfish, C. lineolatus (Supiwong et al 2017b); Nile tilapia, Oreochromis niloticus (Sriuttha et al 2017); three-spot damselfish, Dascyllus trimaculatus (Getlekha et al 2017); ocellated dragonet, Synchiropus ocellatus and picturesque dragonet, S. picturatus (Kasiroek et al 2017c); crystal eye catfish, Hemibagrus wyckii (Supiwong et al 2017d); Chevey s sheetfish, Micronema cheveyi (Pinthong et al 2017); F 1 hybrid catfish: Mekong giant catfish, Pangasianodon gigas striped catfish, P. hypophthalmus and spot pangasius, Pangasius larnaudii Pangasianodon hypophthalmus (Sreeputhorn et al 2017); whitecheek monocle bream, Scolopsis vosmeri (Supiwong et al 2017c); snakehead fishes, Channa marulius and C. marulioides (Sarasan et al 2018); Hihgfin barb fish, Cyclocheilichthys armatus (Chaiyasan et al 2018); black lancer, Bagrichthys majusculus (Supiwong et al 2018); and longfin carp, Labiobarbus leptocheilus (Saenjundaeng et al 2018).…”

Karyotype and Chromosome Behavior Analyses in Three Regions of the Indomalayan Realm

“…He and his coworkers have published 92 articles, reporting the karyotypes of at least 124 species in Cytologia since his first such work in 2005. At least 32 of these karyotypes were the first to be reported worldwide, including those of Fibramia lateralis (Kasiroek et al 2017a), Pterapogon kauderni (Kasiroek et al 2017b), Chaetodon decussatus, C. lineolatus (Supiwong et al 2017a), C. triangulum, C. andamanensis (Supiwong et al 2017b), Synchiropus ocellatus, S. picturatus (Kasiroek et al 2017c), Axis axis (Khongcharoensuk et al 2017), Plectorhinchus pictus (Jantarat et al 2017a), Micronema cheveyi (Pinthong et al 2017b), Scolopsis vosmeri (Patawang et al 2017d), and Crassostrea iredalei (Chooseangjaew et al 2018). Professor Tanomtong won the second Wada Memorial Award for this achievement.…”