Occurrence of Keratella cochlearis (Gosse, 1851) (Rotifera, Monogononta) on San Crist&amp;oacute;bal Island, Gal&amp;aacute;pagos Archipelago, Ecuador

López, Carlos; Steinitz‐Kannan, Miriam; Segers, Hendrik

doi:10.15560/14.5.811

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…Other zooplankton species found in El Junco, in the same sample (September 2, 2004) were a few individuals of the Moina micrura group, not previously reported ( López, Steinitz-Kannan & Segers, 2018b ). Other species reported from the same place are Simocephalus exspinosus , Ceriodaphnia sp., Chydorus sp., Alona sp., and Euryalona orientalis (reported first by Obando, 2009 ).…”

Section: Discussionsupporting

confidence: 71%

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Mastigodiaptomus galapagoensis n. sp. (Crustacea: Copepoda: Diaptomidae), a possibly extinct copepod from a crater lake of the Galápagos archipelago

Elías‐Gutiérrez

Steinitz‐Kannan

Suárez‐Morales

et al. 2023

PeerJ

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Background A new species of a Neotropical diaptomid copepod is described based on individuals recovered from a small, almost forgotten collection of unique plankton samples from El Junco, a crater lake in San Cristóbal island, Galápagos archipelago. This copepod was regularly reported (1966–2004) as an abundant zooplankter in the lake, but it was not found in subsequent plankton surveys (2007–2018), and its specific identity remained unknown. In 2020, it was declared extinct because of introduced fish predation, rotenone treatment, and other major disturbances. The taxonomic examination of these invaluable specimens allowed us to recognize them as representing an undescribed species of the freshwater diaptomid genus Mastigodiaptomus Light, 1939. Methods Here, we describe the new species from El Junco crater lake, located in the San Cristóbal island a part of the Galápagos archipelago, collected with plankton nets. The description is based on detailed morphology, based on SEM and light microscopy. Results The taxonomic examination of these invaluable specimens allowed us to recognize them as representing an undescribed species of the freshwater diaptomid genus Mastigodiaptomus Light, 1939. The new species was readily assigned to this genus and is distinguished from its known congeners by details of (1) the male right fifth leg terminal claw and aculeus, (2) spiniform processes pattern of the right geniculate antennule segments 10–16, (3) length and structure of the spiniform process of the antepenultimate segment of the male right antennule, and (4) details of the dorsal process on the female fourth pediger. This finding represents the first report of this Neotropical copepod genus outside its original biogeographic region, the third species of a diaptomid copepod reported from insular freshwater systems, the southernmost record of Mastigodiaptomus, and the only freshwater calanoid in the Galápagos. The intriguing presence of this chiefly Neotropical copepod genus here could be related either to (1) human agency linked to pirate activities, commercial travelling by Spaniard ships, whaling activities, and intense tortoise hunting in San Cristóbal island. In the past, El Junco was the only freshwater source 600 nautical miles around, or (2) zoochory of resistant dormant stages passively transported by more than 65 migrating bird species known to settle in San Cristóbal. These two hypotheses cannot be properly tested at this time, so the explanation of the presence of this copepod will remain as a new open question in the fascinating natural history of the Galápagos.

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Section: Discussionsupporting

confidence: 71%

“…Other species reported from the same place are Simocephalus exspinosus , Ceriodaphnia sp., Chydorus sp., Alona sp., and Euryalona orientalis (reported first by Obando, 2009 ). Keratella cochlearis was an abundant rotifer in the lake ( López, Steinitz-Kannan & Segers, 2018b ).…”

Section: Discussionmentioning

confidence: 99%

Mastigodiaptomus galapagoensis n. sp. (Crustacea: Copepoda: Diaptomidae), a possibly extinct copepod from a crater lake of the Galápagos archipelago

Elías‐Gutiérrez

Steinitz‐Kannan

Suárez‐Morales

et al. 2023

PeerJ

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“…Similarly to the freshwater Cladocera and Rotifera (López et al 2018a, 2018b), our knowledge of the Copepoda of Ecuador in comparison to other countries in tropical South America is relatively recent and very limited. This is in sharp contrast to the great habitat diversity in the country, ranging from Amazon rainforest, including uphills and the lowlands, to alpine tundra paramo (more than 4000 m a.s.l.)…”

Section: Introductionmentioning

confidence: 99%

An annotated checklist of freshwater Copepoda (Crustacea, Hexanauplia) from continental Ecuador and the Galapagos Archipelago

Corgosinho¹,

Hołyńska²,

Marrone³

et al. 2019

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An annotated checklist of the free-living freshwater Copepoda recorded in different regions in Ecuador (including the Amazon, the Andes, the coastal region, and the Galapagos Islands) is here provided. We revised all published records, critically evaluated the validity of each taxon and provided short taxonomic and biogeographical remarks for each one. A total of 27 taxa have been reported, including species and records at the generic level only. The species and taxa identified only up to the generic level belong to five families and 14 genera. The Cyclopoida is the most diverse group with 16 records belonging to species (or identified to the generic level only) and eight genera, followed by the Harpacticoida with six species, one identification to the generic level only, and four genera, and Calanoida with four species belonging to two genera. A total of 18 taxa are recorded for the Andes. Six have been recorded in the Amazon, two are recorded for the coastal region, and six for the Galapagos. One species is shared between the Amazon and the Andes. One species is shared between the coastal region and the Amazon. Seventeen are only reported from the Andes and four are only reported from the Amazon. At the current status of the knowledge, any attempt to analyze and generalize distributional patterns of copepods in Ecuador is premature due to the scarcity of available information, and evidently there is an urgent need for more extensive field collections. A few working hypothesis for future studies are identified.

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History of limnology in Ecuador: a foundation for a growing field in the country

et al. 2020

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Occurrence of Keratella cochlearis (Gosse, 1851) (Rotifera, Monogononta) on San Cristóbal Island, Galápagos Archipelago, Ecuador

Cited by 5 publications

References 15 publications

Mastigodiaptomus galapagoensis n. sp. (Crustacea: Copepoda: Diaptomidae), a possibly extinct copepod from a crater lake of the Galápagos archipelago

Mastigodiaptomus galapagoensis n. sp. (Crustacea: Copepoda: Diaptomidae), a possibly extinct copepod from a crater lake of the Galápagos archipelago

An annotated checklist of freshwater Copepoda (Crustacea, Hexanauplia) from continental Ecuador and the Galapagos Archipelago

History of limnology in Ecuador: a foundation for a growing field in the country

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