Key to the currently recognized species of Limnias Schrank, 1803 (Rotifera, Monogononta, Gnesiotrocha, Flosculariidae)

Wallace, Robert L.; Kordbacheh, Azar; Walsh, Elizabeth J.

doi:10.11646/zootaxa.4442.2.7

Cited by 537 publications

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“…The application of molecular tools for systematics of sessile rotifers, including Limnias, has been gaining momentum (Kordbacheh et al, 2018). Despite this, the systematics of this and other genera of sessile rotifers is still uncertain, which could underestimate a great diversity of Gnesiotrocha (Wallace et al, 2018). This work is perhaps first approach showing the ecological differences of different morphological types of Limnias spp.…”

Section: Resultsmentioning

confidence: 95%

“…Temperature, one of the important abiotic factors also affects life history traits, mostly documented from a few members of Brachionidae (Sarma et al, 2005). The genus Limnias consists of 8 species (Meksuwan et al, 2018;Wallace et al, 2018) chosen algal level. The rotifer growth experiment was terminated after 24 days by which time most populations began to decline and/or reached an asymptote in each replicate.…”

Section: Introductionmentioning

confidence: 99%

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Temperature-dependent demographic differences in sessile rotifers of the genus Limnias (Rotifera: Gnesiotrocha)

Jiménez‐Santos¹,

Sarma²,

Nandini³

2019

JEB

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Rotifer research on sessile taxa has received less attention because they are not easy to identify in fixed samples. In the Lake Xochimilco, a Ramsar site in Mexico City, three morphotypes of L. ceratophylli and a single morphotype of L. cf. melicerta occur in different densities. The aim of this study was to test if temperature was responsible for the differences in the population densities of these morphotypes. The present study was carried out using population growth method consisting of 4 treatments (3 morphotypes of L. ceratophylli and one of L. cf. melicerta) at 20 and 25°C. Experiments were carried out in 50 ml glass jars containing 25 ml synthetic medium with Chlorella vulgaris as food. The population growth rates (r) were derived. Analysis of variance (ANOVA) and posthoc tests were used to quantify the intra-and interspecific differences in the population growth rates. The temperature levels for optimal population growth rates differed among the morphotypes of same species. At 20°C, the morphotype 1 had the highest r-1 (0.23 d) similar to that of L. cf. melicerta, while-1 morphotype 3 had the lowest (0.15 d). For L. cf. melicerta, the r was higher at 25°C than at 20°C. Of three morphotypes of L. ceratophylli, morphotype 3 had the highest r at 25°C similar to that of L. cf. melicerta at same temperature. There were significant differences among growth patterns within the morphotypes of L. ceratophylli, depending on culture temperature. These trends highlight the relative importance of environmental variables in differentiating morphotypes of a sessile species complex which could explain their possible seasonal changes in the natural waterbodies.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Temperature-dependent demographic differences in sessile rotifers of the genus Limnias (Rotifera: Gnesiotrocha)

Jiménez‐Santos¹,

Sarma²,

Nandini³

2019

JEB

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“…We constructed dichotomous and formula keys of all known Limnias species based on investigation of four species, including the two new species, observed in Thailand. In addition to the four species, we reevaluate the identity of L. cornuella , L. myriophylli , L. nymphaea and L. shiawasseensis , based on original publications, the most recent revision of the group by Wallace et al (2018) , and illustrations available in the Rotifer World Catalog ( Jersabek and Leitner 2013 ). We recognize that number of dorsal plate projections, length of ventral antennae, and tube structure are useful characters for species identification in genus Limnias .…”

Section: Resultsmentioning

confidence: 99%

“…This taxon is recognized by a combination of four characteristics: (1) a corona with two lobed and a wide dorsal gap, (2) a pair of distinct ventral antenna, (3) presence of a stiff dorsal plate, and (4) a firm tube that the adults inhabit (see figure 1 of Wallace et al 2018 ). At present, six valid names of congeners are known: L. ceratophylli Schrank, 1803, L. melicerta Weisse, 1848, L. myriophylli (Tatem, 1868), L. shiawasseensis Kellicott, 1888, L. cornuella Rousselet, 1889 and L. nymphaea Stenroos, 1898 ( Jersabek et al 2015 ; Wallace et al 2018 ). In Thailand, two species of Limnias had to date been identified, L. melicerta and L. ceratophylli by Koste (1975) and Meksuwan et al (2011) .…”

Section: Introductionmentioning

confidence: 99%

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Two new species of genus Limnias from Thailand, with keys to congeners (Rotifera, Gnesiotrocha)

Meksuwan¹,

Jaturapruek²,

Maiphae³

2018

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Two new species and two morphological variant taxa of sessile rotifers found during a survey of Thai rotifers are reported upon. Living specimens were collected and identified from twelve sampling sites. The specimens were photographed, and prepared for SEMs of dorsal plates and trophi. Two new species of genus Limnias are recognized. Limniaslenissp. n. possesses a corona with a relatively shallow ventral sinus, and a dorsal plate without any projection, whereas Limniasnovemcerassp. n. carries a corona with a deep and wide ventral sinus, and a dorsal plate with nine projections. Two morphological variants of Limniasmelicerta are discussed, which are designated as L.melicerta SH and L.melicerta LH on the basis of the length of the horns on their dorsal plates. Moreover, both a dichotomous key and a formula key are provide including all Limnias species known to date.

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Scaling of respiration in colonial invertebrates

Brown,

Walsh

2024

Limnology & Oceanography

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Coloniality may grant colony members an energetic advantage in the form of lower individual respiration rates as colony size increases. If this occurs it should be apparent as negative allometric scaling of respiration with colony size, and colonial organisms should have scaling factors < 1. However, colonial members from phylum Rotifera have yet to be examined. To test if colonial rotifers possess allometric scaling relationships between respiration rate and colony size, we measured respiration rates for four solitary and three colonial rotifer species; from these respiration rates we estimated scaling factors. We found mixed evidence for allometric scaling of respiration rate in colonial rotifers. Both rotifers with allometric scaling of respiration rate, Conochilus hippocrepis and Lacinularia flosculosa, have extensive mucilaginous coverings. These coverings may represent an investment of colony members into a shared structure, lowering individual metabolic costs and thus respiratory needs. Additionally, we determined which traits are associated with allometric scaling of respiration. We compiled known scaling factors for animal phyla from a wide phylogenetic spectrum with colonial representatives and conducted a hierarchical mixed regression that included attributes of colonies. Traits associated with allometric scaling in colonial animals included colony shape, the presence of shared extrazooidal structures, and planktonic lifestyle. There are many other colonial rotifers and animal taxa for which allometric scaling factors have yet to be estimated, knowing these may enhance our understanding of the benefits of coloniality in animals.

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Key to the currently recognized species of Limnias Schrank, 1803 (Rotifera, Monogononta, Gnesiotrocha, Flosculariidae)

Cited by 537 publications

References 0 publications

Temperature-dependent demographic differences in sessile rotifers of the genus Limnias (Rotifera: Gnesiotrocha)

Temperature-dependent demographic differences in sessile rotifers of the genus Limnias (Rotifera: Gnesiotrocha)

Two new species of genus Limnias from Thailand, with keys to congeners (Rotifera, Gnesiotrocha)

Scaling of respiration in colonial invertebrates

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