Length-stabilized weight and morphometric data of the scyphozoan jellyfish Acromitus maculosus and Acromitus flagellatus from Koch Backwaters, Kerala, India
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| Format: | Dataset Open Access |
| Language: | en |
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2026
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| _version_ | 1867171891633979392 |
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| author | Veloorkirakathil Narayana, Sanjeevan Vijayan Matilda, Milena Chakkalaparmbil Gokulan, Nithara Sundar Lathika, Remya Raghavan, Gireesh |
| author_facet | Veloorkirakathil Narayana, Sanjeevan Vijayan Matilda, Milena Chakkalaparmbil Gokulan, Nithara Sundar Lathika, Remya Raghavan, Gireesh |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The study was carried out in two species (Acromitus maculosus and A. flagellatus) in order to check whether the collected species are only morphologically distinct or indeed congeneric species of Acromitus as reported by earlier authors/previous reports. The samples (72 nos.) are collected during the pre-monsoon seasons (mid-February to end May) of 2019, 2020, 2021 and 2023 from the stake-net fishery operating in the Kumbalam estuary (Lat. 9054' 14" N;Long. 760 18' 17" E) of Vembanad lake, Kerala India. The Scyphozoan jellyfish Acromitus maculosus and A. flagellatus are considered to be valid species under the genus Acromitus. In laboratory, following morphometric measurements of each specimen were taken for analysis such as Oral Arm Length, Oral Arm Stalk, Oral Arm Wing, Radius of Oral Disk, Ring Canal Radius, Inner Muscle, Outer Anastomosing Canal System and weight of the specimens. On analysis, specimens of A. maculosus and A. flagellatus from Kochi backwaters, India indicate that the two putative species differ only in their morphologic features and that there are no significant variations in their morphometric and genetic traits except for the medusa diameter- stabilized wet weight relation. On DNA analysis, the genetic distance in the CO1 gene sequence of the putative species A. maculosus and A. flagellatus (0.4%) were below the threshold value suggesting that the two species are similar in their genetic traits. As the observed variations in two species were limited to morphologic features with transitional morphologic forms in between and the lack of significant morphometric and/ or genetic variations among the two putative species necessitate a through recheck on the species status of A. maculosus and A. flagellatus. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_971926 |
| institution | PANGAEA |
| language | en |
| publishDate | 2026 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Length-stabilized weight and morphometric data of the scyphozoan jellyfish Acromitus maculosus and Acromitus flagellatus from Koch Backwaters, Kerala, India Veloorkirakathil Narayana, Sanjeevan Vijayan Matilda, Milena Chakkalaparmbil Gokulan, Nithara Sundar Lathika, Remya Raghavan, Gireesh Accession number, genetics; Acromitus flagellatus; Acromitus maculosus; Bell diameter; DATE/TIME; DEPTH, water; Digital caliper, Mitutoyo, CD-6''ASX; Digital scale, Tula Bhavan, Hercules HT; Event label; Inner muscle; Kumbalam_estuary; Latitude of event; Leopard spot jellyfish; Longitude of event; Month; Oral arm length; Oral arm stalk; Oral arm wing; Outer anastomosing canal system; Phenotypic variant; Radius of oral disk; Ring canal radius; Sample number; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Stabilized weight; Stake net The study was carried out in two species (Acromitus maculosus and A. flagellatus) in order to check whether the collected species are only morphologically distinct or indeed congeneric species of Acromitus as reported by earlier authors/previous reports. The samples (72 nos.) are collected during the pre-monsoon seasons (mid-February to end May) of 2019, 2020, 2021 and 2023 from the stake-net fishery operating in the Kumbalam estuary (Lat. 9054' 14" N;Long. 760 18' 17" E) of Vembanad lake, Kerala India. The Scyphozoan jellyfish Acromitus maculosus and A. flagellatus are considered to be valid species under the genus Acromitus. In laboratory, following morphometric measurements of each specimen were taken for analysis such as Oral Arm Length, Oral Arm Stalk, Oral Arm Wing, Radius of Oral Disk, Ring Canal Radius, Inner Muscle, Outer Anastomosing Canal System and weight of the specimens. On analysis, specimens of A. maculosus and A. flagellatus from Kochi backwaters, India indicate that the two putative species differ only in their morphologic features and that there are no significant variations in their morphometric and genetic traits except for the medusa diameter- stabilized wet weight relation. On DNA analysis, the genetic distance in the CO1 gene sequence of the putative species A. maculosus and A. flagellatus (0.4%) were below the threshold value suggesting that the two species are similar in their genetic traits. As the observed variations in two species were limited to morphologic features with transitional morphologic forms in between and the lack of significant morphometric and/ or genetic variations among the two putative species necessitate a through recheck on the species status of A. maculosus and A. flagellatus. |
| title | Length-stabilized weight and morphometric data of the scyphozoan jellyfish Acromitus maculosus and Acromitus flagellatus from Koch Backwaters, Kerala, India |
| topic | Accession number, genetics; Acromitus flagellatus; Acromitus maculosus; Bell diameter; DATE/TIME; DEPTH, water; Digital caliper, Mitutoyo, CD-6''ASX; Digital scale, Tula Bhavan, Hercules HT; Event label; Inner muscle; Kumbalam_estuary; Latitude of event; Leopard spot jellyfish; Longitude of event; Month; Oral arm length; Oral arm stalk; Oral arm wing; Outer anastomosing canal system; Phenotypic variant; Radius of oral disk; Ring canal radius; Sample number; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Stabilized weight; Stake net |
| url | https://doi.org/10.1594/PANGAEA.971926 |