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Veloorkirakathil Narayana, Sanjeevan; Vijayan Matilda, Milena; Chakalathil Gokulan, Nithara; Sundar Lathika, Remya; Raghavan, Gireesh: Length-stabilized weight and morphometric data of the scyphozoan jellyfish Acromitus maculosus and Acromitus flagellatus from Koch Backwaters, Kerala, India [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.971926 (dataset in review)

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Abstract:
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.
Keyword(s):
Acromitus flagellatus; Acromitus maculosus; Leopard spot jellyfish; Phenotypic variant
Supplement to:
Veloorkirakathil Narayana, Sanjeevan; Vijayan Matilda, Milena; Chakalathil Gokulan, Nithara; Sundar Lathika, Remya; Raghavan, Gireesh (in prep.): First record of the leopard-spot jellyfish Acromitus maculosus Light 1914 from North Indian Ocean with a re-description of the species.
Veloorkirakathil Narayana, Sanjeevan; Vijayan Matilda, Milena; Chakalathil Gokulan, Nithara; Sundar Lathika, Remya; Raghavan, Gireesh (in review): Stabilized weight-length relationship and pre-monsoon ascendency of jellyfish Acromitus maculosus and Acromitus flagellatus in Kochi-backwaters, India. Thalassas
Coverage:
Latitude: 9.903890 * Longitude: 76.304720
Date/Time Start: 2019-04-01T00:00:00 * Date/Time End: 2024-04-01T00:00:00
Minimum DEPTH, water: 6 m * Maximum DEPTH, water: 6 m
Event(s):
Kumbalam_estuary * Latitude: 9.903890 * Longitude: 76.304720 * Date/Time Start: 2019-04-01T00:00:00 * Date/Time End: 2023-05-01T00:00:00 * Method/Device: Stake net
Comment:
This study was supported by the Centre of Excellence for Aquatic Resource Management and Conservation and the Kerala governmental research fund at the Kerala University of Fisheries and Ocean Studies.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4DEPTH, waterDepth watermRaghavan, GireeshGeocode – Approximate depth. Sample collections were made from near shore coastal waters (2-10m depth).
5DATE/TIMEDate/TimeRaghavan, GireeshGeocode – Exact sampling date not known
6MonthMonthRaghavan, Gireesh
7Species, unique identificationSpecies UIDRaghavan, Gireesh
8Species, unique identification (Semantic URI)Species UID (Semantic URI)Raghavan, Gireesh
9Species, unique identification (URI)Species UID (URI)Raghavan, Gireesh
10Sample numberSample noRaghavan, Gireesh
11Bell diameterBell diammmRaghavan, GireeshDigital caliper, Mitutoyo, CD-6''ASX
12Oral arm lengthOALmmRaghavan, GireeshDigital caliper, Mitutoyo, CD-6''ASXOAL is the combined length of OAS and OAW. The Terminal Appendage (TA) is not considered as in most specimens TA was broken and incomplete.
13Oral arm stalkOASmmRaghavan, GireeshDigital caliper, Mitutoyo, CD-6''ASX
14Oral arm wingOAWmmRaghavan, GireeshDigital caliper, Mitutoyo, CD-6''ASX
15Ring canal radiusRCRmmRaghavan, GireeshDigital caliper, Mitutoyo, CD-6''ASX
16Radius of oral diskRODmmRaghavan, GireeshDigital caliper, Mitutoyo, CD-6''ASX
17Outer anastomosing canal systemOACSmmRaghavan, GireeshDigital caliper, Mitutoyo, CD-6''ASX
18Inner muscleIMmmRaghavan, GireeshDigital caliper, Mitutoyo, CD-6''ASX
19Stabilized weightStabilized weightgRaghavan, GireeshDigital scale, Tula Bhavan, Hercules HT
20Accession number, geneticsAccess no genRaghavan, GireeshCO1 sequence deposited with GeneBank
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
907 data points

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