Overview

Distribution

Biogeography

Australis
Palaearctis
Nearctis
Orientalis
Afrotropis
Neotropis
Pacific

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It is widely distributed in tropical waters and extends very often into subtropical areas as a summer form.

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© Leasi, Francesca

Source: Marine Rotifera

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Physical Description

Morphology

Lorica compressed dorsoventrally. The anterior dorsal margin with six spines, medians being the longest, stoutest and curved ventralward. Lateral usually little longer than intermediate. Lorica with two unequal posterior spines. Right spine being always longer than the left. The left posterior spine is being absent in some specimens. The dorsal surface of lorica consists of three median polygones and a small four sides structure and three pairs of marginals. It bears two posterior spines on the lorica with the left spine shorter than the exuberant right one. This species show morphological (cyclomorphic) variation.

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© Leasi, Francesca

Source: Marine Rotifera

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Size

Lorica length 150-240 µm; width 65-90 µm; left posterior spine 32 µm; right posterior spine 85 µm.

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© Leasi, Francesca

Source: Marine Rotifera

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Type Information

Collection specimen

Non-type voucher specimen for Keratella tropica (Apstein, 1907)
Catalog number: 0117
Collection: Hendrik Segers, personal working collection, Brussels, Belgium
Prepared by: Segers, H
Sex/stage/structure: females
Preparation: Slide Preparation; Microscope slide, pure Glycerine mount, DePex sealing
Specimen Count: 3

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Collection specimen

Non-type voucher specimen for Keratella tropica (Apstein, 1907)
Catalog number: 19885
Collection: National Museum of Natural History, Smithsonian Institution, Washington DC, USA
Prepared by: Myers, F J
Sex/stage/structure: females
Preparation: Slide Preparation; Microscope slide
Specimen Count: 3

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Collection specimen

Non-type voucher specimen for Keratella tropica (Apstein, 1907)
Catalog number: 1388
Collection: Academy of Natural Sciences of Drexel University, Philadelphia, USA
Prepared by: Myers, F J
Sex/stage/structure: females
Preparation: Slide Preparation
Specimen Count: 6

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Collection specimen

Non-type voucher specimen for Keratella tropica (Apstein, 1907)
Catalog number: 1387
Collection: Academy of Natural Sciences of Drexel University, Philadelphia, USA
Prepared by: Myers, F J
Sex/stage/structure: females
Preparation: Slide Preparation
Specimen Count: 11

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Collection specimen

Non-type voucher specimen for Keratella tropica (Apstein, 1907)
Catalog number: 1386
Collection: Academy of Natural Sciences of Drexel University, Philadelphia, USA
Prepared by: Bennetch, L M
Sex/stage/structure: females
Preparation: Slide Preparation
Specimen Count: 8

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Collection specimen

Non-type voucher specimen for Keratella tropica (Apstein, 1907)
Catalog number: 0499
Collection: Academy of Natural Sciences of Drexel University, Philadelphia, USA
Prepared by: Myers, F J
Sex/stage/structure: females
Preparation: Slide Preparation
Specimen Count: 8

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Collection specimen

Non-type voucher specimen for Keratella tropica (Apstein, 1907)
Catalog number: 0529
Collection: Academy of Natural Sciences of Drexel University, Philadelphia, USA
Prepared by: Myers, F J
Sex/stage/structure: females
Preparation: Slide Preparation
Specimen Count: 6

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Look Alikes

This species was separated from K. valga by Berzins (1955). The distinguishing character, i.e. the hindmost median plaque of the dorsal lorica (the "postero-median remnant" according to the terminology used by Ahlstrom 1943), is clearly discernible in most individuals, although in some specimens it was very small and hardy visible.

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© Leasi, Francesca

Source: Marine Rotifera

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Ecology

Migration

Alien species

Keratella tropica is, like most rotifers, widely distributed. This species is mainly found in tropical and subtropical freshwater, but during summer it also thrives in temperate areas. This rotifer is a free-swimming species that tolerates brackish water. By transport in the ballast water of ships that pass through channels or via birds, the species reached Belgian regions. This species was first reported in Belgium in 1974 at Donkmeer, and at the Ghent Watersportbaan (East Flanders). At the moment, the species has colonized the upper reaches of the Scheldt river as wel as the Sea Scheldt.
  • VLIZ Alien Species Consortium
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Alien species

Het tropisch puzzelraderdier Keratella tropica is, zoals de meeste raderdiertjes, wijdverspreid. Het diertje is vooral gekend in tropisch en subtropisch zoetwater, maar gedijt in de zomer ook goed in gematigde streken. Dit raderdiertje is een vrijzwemmende soort die ook brak water tolereert. Via het transport met ballastwater van schepen doorheen kanalen of via vogels, belandde deze soort in onze contreien. In België werd dit diertje voor het eerst waargenomen in 1974 in het Donkmeer en in de Gentse Watersportbaan in Oost-Vlaanderen. Momenteel heeft deze soort de bovenloop van de Schelde en de Zeeschelde gekoloniseerd
  • VLIZ Alien Species Consortium
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Keratella tropica

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 9
Species With Barcodes: 1
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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