Published August 17, 2023
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Table 1 in Description of Elthusa aquabio sp. n. (Crustacea: Isopoda: Cymothoidae), a branchial fish parasitic isopod from Indian waters
Description
Table 1. Inter-specific characters of Elthusa aquabio sp. n., Elthusa fistularia, E. pseudorhombus, and E. uranoscopus, described from Indian waters.
| E. uranoscopus | ||||
|---|---|---|---|---|
| E. pseudorhombus | E. fistularia Aneesh, | Aneesh, Helna, | ||
| Aneesh, Helna, Kumar | Helna, Kumar and | Kumar and Trilles, | ||
| Character | E. aquabio sp. n. | and Trilles, 2020 | Trilles, 2020 | 2020 |
| Cephalon | 1.20 times wider than | 1.7 times wider than | 1.2 times wider than | 1.6 times wider than |
| long | long | long | long | |
| Coxae | Coxae 2–4 very narrow, | Coxae 6 and 7 longer | Coxae 6 equal to | Coxae 6 and 7, flat, |
| slightly visible in | than the pereonites, | pereonite, 7, | broad, longer than | |
| dorsal view, much | coxae 7 overlapping | extending | the corresponding | |
| shorter than | lateral margin of | beyond, coxae 6– | pereonite; | |
| pereonites; coxae 5– | pleonite 1–2 | 7 posteroventral | posteroventral | |
| 7, flat, broad,laterally | posteroventral angles | angles broadly | margin rounded | |
| expanded, 5 nearly | acute | rounded | ||
| as long as pereonite, | ||||
| 6–7 longer than the | ||||
| pereonites | ||||
| Antenna | With 10 articles | With 10 articles | With 9 articles | With 11 articles, |
| slightly longer | ||||
| than antennula | ||||
| Pleon length | ~16% BL | ~14% BL | ~15% BL | ~16% BL |
| Ratio of maximum | 0.75 | 0.75 | 0.80 | 0.84 |
| pleon width to | ||||
| maximum | ||||
| pereion width | ||||
| Pleonites | Pleonite 3 widest | Pleonite 4 widest | Pleonite 2 widest | Pleonite 3 widest |
| Pleotelson | Broadly round, 2.0 | Evenly rounded, 1.5 | Broadly round, 1.7 | Pleotelson 1.8 times |
| times as wide as long | times as wide as long | times as wide as | as wide as long, | |
| long, lateral | lateral margins | |||
| margins convex | convex | |||
| Rami | Endopod 1.05 times as | Endopod 0.8 times as | Endopod as long as | Endopod 1.3 times |
| long as exopod | long as exopod | exopod | longer than | |
| exopod | ||||
| Pereopod spines | Pereopods 1–3 | Absent | Absent | Absent |
| propodus inner- | ||||
| lateral margin with | ||||
| few robust spines |
Notes
Published as part of Aneesh, Panakkool Thamban, Helna, Ameri Kottarathil, Raj, Smrithy & Kumar, Appukuttannair Biju, 2023, Description of Elthusa aquabio sp. n. (Crustacea: Isopoda: Cymothoidae), a branchial fish parasitic isopod from Indian waters, pp. 1202 in Journal of Natural History 57 (21 - 24) on page 1202, DOI: 10.1080/00222933.2023.2242099, http://zenodo.org/record/8270960
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