Mukkattu Nazar Suhaana, Jaime Gómez-Gutiérrez, Paravanparambil Rajakumar Jayachandran, Punnakkal Hari Praved, Sivasankaran Bijoy Nandan. A Review on the parasitic isopod genus Notophryxus G O Sars, 1883 (Crustacea: Isopoda), and first report of Notophryxus globularis G O Sars, 1885 from Lakshadweep Sea (Amini Island)[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2217-3
Citation:
Mukkattu Nazar Suhaana, Jaime Gómez-Gutiérrez, Paravanparambil Rajakumar Jayachandran, Punnakkal Hari Praved, Sivasankaran Bijoy Nandan. A Review on the parasitic isopod genus Notophryxus G O Sars, 1883 (Crustacea: Isopoda), and first report of Notophryxus globularis G O Sars, 1885 from Lakshadweep Sea (Amini Island)[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2217-3
Mukkattu Nazar Suhaana, Jaime Gómez-Gutiérrez, Paravanparambil Rajakumar Jayachandran, Punnakkal Hari Praved, Sivasankaran Bijoy Nandan. A Review on the parasitic isopod genus Notophryxus G O Sars, 1883 (Crustacea: Isopoda), and first report of Notophryxus globularis G O Sars, 1885 from Lakshadweep Sea (Amini Island)[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2217-3
Citation:
Mukkattu Nazar Suhaana, Jaime Gómez-Gutiérrez, Paravanparambil Rajakumar Jayachandran, Punnakkal Hari Praved, Sivasankaran Bijoy Nandan. A Review on the parasitic isopod genus Notophryxus G O Sars, 1883 (Crustacea: Isopoda), and first report of Notophryxus globularis G O Sars, 1885 from Lakshadweep Sea (Amini Island)[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2217-3
A Review on the parasitic isopod genus Notophryxus G O Sars, 1883 (Crustacea: Isopoda), and first report of Notophryxus globularis G O Sars, 1885 from Lakshadweep Sea (Amini Island)
Department of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology, Fine Arts, Avenue, Kochi - 682016, Kerala, India
2.
Departamento de Plancton y Ecología Marina, Centro Interdisciplinario de Ciencias Marinas, Instituto Politécnico Nacional, La Paz, B.C.S., 23096, Mexico
3.
Applied Research Centre for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
Isopod crustaceans of the family Dajidae are exclusively marine ectoparasites. The genus NotophryxusG. O. Sars, 1883 currently includes nine nominal species, which are very rarely reported as the chances for encountering these specimens are unpredictable. Our comprehension of the taxonomy, biology, ecology, and life cycle of species belonging to the Notophryxus genus is notably lacking. All nominal species of Notophryxus genus are reviewed here to obtain a comprehensive and integrative taxonomic understanding of this genus, in an attempt to address the lacunae. This paper also documents the rediscovery of an ectoparasitic isopod from the genus Notophryxus in Indian waters, after 55 years. Adult isopod specimens obtained from the outer reefs of Amini Island in the Lakshadweep archipelago, Southeastern Arabian Sea, display morphological congruence to Notophryxus globularisG.O. Sars, 1885. The only previous report on this species dates back to 1885 from G.O. Sars' description of N. globularis as an ectoparasite on the euphausiid Thysanoessa gregariaG.O. Sars, 1883 in the North Pacific. This discovery represents a range extension of N. globularis from the North Pacific to the Arabian Sea. Two cryptoniscid larvae and three adult females of N. globularis (with dwarf males) were found attached to four adult mysid specimens of Siriella aequiremisHansen, 1910. The present study provides an improved diagnosis of N. globularis with the aid of light microscopy images and line drawings which was not given in the original G O Sars, 1885 report. This research also provides a concise description of cryptoniscid larvae from the same sampling location and same host which is most likely to be N. globularis larvae.
Figure 1. Map showing the biogeographic distribution of Notophryxus (Sars, 1883) species, in World Oceans (a). Study location at Amini Island from where specimens of Notophryxus globularis, were collected (b).
Figure 3. Notophryxusglobularis:Adult female (with a male) attached to the dorsal part of the cephalothorax of the mysid host Siriella aequiremis (a); Magnified view of an adult female with attached male, habitus, lateral (b) ; Light microscope image of an adult female, habitus, ventral view (c); SEM image of the same adult female, habitus, ventral (d); SEM image of the ventral portion of a female head (appendages lost due to excessive shrinkage of the specimen during SEM preparation) (e); Light microscope image of adult male, habitus, lateral (f); SEM image of the adult male, habitus, ventro-lateral view (g); Light microscope image cryptoniscus larvae parsimoniously identified as N.globularis, habitus, ventral (h).
Figure 4. Morphological comparison of adult females of Notophryxus genus: a1−a2. Notophryxus clypeatus (G. O. Sars, 1879) a1) Adult female, habitus, dorsal a2) Adult female with attached male, habitus, ventral (redrawn from Brandt, 1993); b1−b2. Notophryxus ovoidesG. O. Sars, 1883, b1) Ovigerous adult female, habitus, dorsal, b2) Ovigerous adult female, habitus, ventral (Redrawn from G O Sars, 1883); c1−c2. Notophryxus globularisG. O. Sars, 1885, c1) Adult female with attached male, habitus, lateral, c2) Adult female, habitus, ventral (present study); d1−d2. Notophryxus lateralisG. O. Sars, 1885, d1) Adult female, habitus, dorso-lateral, d2) Female with attached male, habitus, ventral, (redrawn from Field, 1969); e1−e2. Notophryxus lobatusPillai, 1964, e1) Ovigerous female, habitus, dorsal, e2) Ovigerous female, habitus, ventral, (redrawn from Pillai, 1964); f1−f2. Notophryxus lobusSchultz, 1977; f1) Gravid female, habitus, dorsal, f2) Adult female, habitus, ventral, (redrawn from Schultz, 1977); g1−g2. Notophryxus ovalisSchultz, 1978, g1) Gravid female, habitus, ventral, g2) Gravid female, habitus, dorsal (Redrawn from Schultz, 1978); h1−h2. Notophryxus ocellatusShimomura and Ohtsuka, 2011, h1) Adult female, habitus, dorsal, h2) Adult female, habitus, ventral, (redrawn from Shimomura and Ohtsuka, 2011).
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