Polygordius madrasensis Aiyar and Alikunhi, 1944
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publication ID |
https://doi.org/ 10.26515/rzsi/v122/i3/2022/167818 |
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persistent identifier |
https://treatment.plazi.org/id/2C7D87C3-6212-FFCC-FF1B-FED88A4DFB66 |
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treatment provided by |
Felipe |
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scientific name |
Polygordius madrasensis Aiyar and Alikunhi, 1944 |
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Polygordius madrasensis Aiyar and Alikunhi, 1944 View in CoL (Emended)
Figures 2 View Figure 2 , 3 View Figure 3 and Table 1.
Neotype: MB /SBN/VD8
Diagnosis: Elongated, smooth and slender body with cylindrical shape; uniform width all along the body; prostomium rounded; external ciliation and segmentation absent; paired palps twice the length of the prostomium; eyespot absent; inflated pygidium bearing a pair of terminal pygidial cirri; pygidial cirri shorter than palps; well-distinct longitudinal pygidial glands (14-16); anal lobes, parapodia and chaetae are absent.
Description: The body length (from the anterior rim of the prostomium to the base of the pygidial cirri) of the neotype is 5.08 mm with a 0.11 mm width ( Figure 2 E View Figure 2 ). Prostomium rounded (0.058 mm) with a pair of long un-ciliated frontally orientated palps (0.108 mm) attached closer at its anterior margin ( Figure 2 A View Figure 2 ). Palp
Naduvilakkandy Vishnudattan, Paravanparambil Rajakumar Jayachandran and Sivasankaran Bijoy Nandan to prostomium ratio, 1.86:1. Shallow head folds separate the prostomium and peristomium ( Figure 2 A View Figure 2 ). Pigment spots are absent. Circular mouth (30 μm) positioned ventrally opens into a highly ciliated cavity ( Figure 2 D View Figure 2 ). The posterior region consists of an inflated pygidium with a width of 0.132 mm and a pair of terminal pygidial cirri (0.054 mm) ( Figure 2 B View Figure 2 ). A glandular belt (12.18 μm) is present at the base of the pygidium. 14-16 highly distinct, oval shaped and longitudinally oriented pygidial glands (av. 12 μm length and 8 μm width) are present with a space between them ( Figure 2 C View Figure 2 ). Terminal anus with no anal lobes. The body is devoid of parapodia and chaetae ( Figure 3 View Figure 3 ).
Ecology: Salinity and temperature of the interstitial water from the sampling site were recorded as 35.2 PSU and 30 °C respectively, with a pH of 8.06. Porewater dissolved oxygen was recorded as 3.24 mg /L. The porewater dissolved inorganic nitrogen and dissolved inorganic phosphorus were 12.41 μmol/L and 1.71 μmol/L respectively. Whereas dissolved inorganic silicate was recorded as 2.4 μmol/L. Sediment type was sandy. The sediment organic carbon percentage was noted as 0.29% while total nitrogen was near to 0.003%. P. madrasensis showed a numerical abundance of 149 ind/ 10 cm 2.
| MB |
Universidade de Lisboa, Museu Bocage |
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