Coleps amphacanthus Ehrenberg, 1833
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publication ID |
https://doi.org/ 10.26515/rzsi/v121/i4/2021/158008 |
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persistent identifier |
https://treatment.plazi.org/id/03FBD330-FFE3-FFEA-3B6B-FAE75B1FFDEC |
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treatment provided by |
Felipe |
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scientific name |
Coleps amphacanthus Ehrenberg, 1833 |
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2. Coleps amphacanthus Ehrenberg, 1833 View in CoL ( Figure 2 View Figure 2 A-P; Table 2).
Two populations isolated from ponds in Kolkata, i.e., (small natural pond and Senhati Jheel).
Description: (small natural pond population) ( Figure 1A–I View Figure 1 ): Size in vivo 60-80 µm × 30-45 µm on average, usually about 75 µm × 45 µm, as calculated from some in vivo measurements (n=3) and the morphometric data in Table 1, adding 15% for preparation shrinkage ( Kumar and Foissner 2016; Kumar et al., 2016). Body broad, typical barrel shaped with length:width ratio about 1.5. Macronucleus, spherical, 11.0–17.0 µm across, below midline towards posterior body end. Cortex without symbiotic algae. Contractile vacuole at posterior end of the body. Cells appear dark at low magnification, anterior end narrow with single spine, posterior end rounded with three distinct caudal spines. Six types of armour tiers with 18 windows: anterior secondary with 2, anterior main with 8, posterior main with 6, and posterior secondary with 2 windows. Windows hirtus- type. Eighteen meridionally arranged somatic kineties, 23 transverse ciliary rows. On average, seven distinct long caudal cilia.
The Senhati Jheel population ( Figure 1J–P View Figure 1 ) was studied in live only and found to be similar the above mentioned population from small pond in Kolkata (for details refer Table 2 and Figure 2 View Figure 2 ).
Material deposited: A slide including protargolimpregnated specimens have been deposited at the National Zoological Collections of the Zoological Survey of India, Kolkata, India with the accession numbers Pt. 4917/2, 5082, 5166/2, 5212 (Small natural pond population) and Pt. 5200/1 (Senhati Jheel population).
Occurrence and ecology: Distribution, Europe and Asia; feeds on bacteria, flagellates and small ciliates.
Molecular sequence comparison: The SSU rRNA gene sequence of C. amphacanthus (1525bp; GC content –
45.6%) was deposited in GenBank with accession number MT271853. The 18S rDNA sequence of the Kolkata population of C. amphacanthus shows difference with the available sequences of the Chinese population of C.
Acknowledgement amphacanthus by 97%. This indicates, along with the difference in the body size (i.e., the Kolkata population is considerably smaller, 63 × 34 µm vs. 90 × 45 µm in protargol preparation), that the Kolkata population could be a new species/subspecies. However, we do not perform any change and wait for further data.
The authors greatly thank the Director, Zoological Survey of India, Kolkata, India, for the support and encouragement. References
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