Agarna malayi Tiwari, 1952

Ravichandran, S., Vigneshwaran, P. & Rameshkumar, G., 2019, A taxonomic review of the fish parasitic isopod family Cymothoidae Leach, 1818 (Crustacea: Isopoda: Cymothooidea) of India, Zootaxa 4622 (1), pp. 1-99 : 9-10

Agarna malayi Tiwari, 1952

Agarna malayi Tiwari, 1952: 295 –300, pl. IV (figs 1, 2).— Bowman & Tareen, 1983: 21.— Aneesh, Helna & Sudha, 2016a: 1270–1277, fig. 1a–d.— Aneesh, Sudha, Helna & Anilkumar, 2018a: 1–22, figs 1–14 .— Trilles, Ravichandran & Rameshkumar, 2011: 448.— Rijin, Sudha, Vineesh & Anilkumar, 2019: 241–249, fig. 1h, i.

Indusa malayi . — Pillai, 1964: 214–216, figs 3 , 7c.— Trilles, 1994: 1981.—Trilles & Vala, 1975.

Indusa ophueseni Pillai, 1954: 15 .

Indusa pustulosa Pillai, 1954: 16 ; 1964: 216–218, figs 4, 7d [new synonymy].

Elthusa raynaudii .— Kazmi, Schotte & Yousuf, 2002: 103, fig. 86.

Type and type locality. Holotype ( NZC-ZSI C3121 /2) and associated female paratype ( NZC-ZSI C3122 /2) from Nematalosa nasus . Tiwari (1952) stated that the cymothoid specimens with host fishes were purchased from Bow Bazar, Kolkata, India by Malay Kumar Datta.

Remarks. Agarna malayi can be easily distinguished from other species of Agarna by its largely hunched body and the shape of the cephalon and pereonite 1. One side of the body almost straight and other side strongly recurved; cephalon roughly triangular with narrow round apex, accommodated in the deeply recessed amphicephalic process of pereonite 1; presence of many pustules on dorsal surface of pleotelson.

Aneesh et al. (2018a) in a footnote compared Pillai’s (1964) figures of Agarna pustulosa (as Indusa pustulosa ) with Tiwari (1952) description and his redescription of A. malayi and considered that the species were the same. After reviewing Pillai’s (1964) drawings of A. pustulosa , the distinctive rhomboid-shaped body and prominent pustules are present on the dorsal side of the telson confirms this species as a junior synonym of A. malayi .

Pillai’s (1964) drawings of A. pustulosa are similar to the holotype illustrations of Aneesh et al. (2018a), showing characteristics of the largely hunched body slightly longer than wide, widest at pereonite 4; one side of the body almost straight and other side strongly recurved; cephalon symmetrical roughly triangular with narrow round apex, accommodated in the deeply recessed amphicephalic process of pereonite; pereonite 1 without coxa, all the coxae are visible in dorsal view; 2 and 3 transversely placed, 4–7, triangular; Pleotelson slightly shorter than pleonite 5, posterior margin broadly rounded; uropod rami short, flattened extend almost up to the distal margin of pleotelson; rami subequal in length, curved and apically rounded; mandible palp 3 segmented; basal segment border, apical segment short and conical; maxillula with 4 unequal slightly recurved apical spines; outer pair much shorter than inner; maxilliped without oostegial lobe; article 3 with 3 large terminal recurved spines. We requested a loan of the type material of Pillai’s A. pustulosa , but the specimen could not be located. Pillai’s (1964) description and illustrations nonetheless support a synonymy with A. malayi .

Distribution. Agarna malayi distributed only in India (Tiwari 1952; Pillai 1954, 1964; Aneesh et al. 2018a).

Hosts. Reported from Nematalosa nasus (Clupeidae) (see Tiwari 1952); Valamugil cunnesius (Valenciennes, 1836) (as Mugil ophueseni ) ( Mugilidae ) and Anodontostoma chacunda (Hamilton, 1822) (as Dorosoma chacunda ) (see Pillai 1954, 1964); Tenualosa toli (Valenciennes, 1847) (Clupeidae) (see Aneesh et al. 2018a).

Figures

FIGURE 1. a–c, Anilocra dimidiata Bleeker, 1857, female (24 mm), (ZSI/MBRC D1-529); d–f, Catoessa boscii (Bleeker, 1857), female (17 mm), (ZSI/MBRC D1-530); g–i, Ceratothoa angulata (Richardson, 1910), female (29 mm), (ZSI/MBRC D1-533); j–l, Cymothoa bychowskyi Avdeev, 1979, female (27 mm), (CAS/MBRM C-87); m–o, Cymothoa eremita (Brünnich, 1783), female (29 mm), (ZSI/MBRC D1-532); p–r, Cymothoa frontalis Milne Edwards, 1840, female (25 mm), (CAS/MBRM C-89).

FIGURE 2. a–c, Cymothoa indica Schiöedte & Meinert, 1884, female (25 mm), (CAS/MBRM C-97); d–f, Cymothoa parupenei Avdeev, 1979, female (25 mm), (ZSI/MBRC D1-533); g–i, Glossobius impressus (Say, 1818) female (26.7 mm) (ZSI/MBRC D1-554); j–l, Joryma hilsae Rameshkumar et al. 2011, female (20 mm), (ZSI/MBRC D1-535); m–o, Joryma sawayah Bowman & Tareen, 1983, female (14 mm), (ZSI/MBRC D1-536); p–r, Lobothorax typus Bleeker, 1857, female (23 mm), (ZSI/MBRC D1-537).

FIGURE 3. a–c, Mothocya collettei Bruce, 1986, female (25 mm), (CAS/MBRM C-149); d–f, Mothocya melanosticta (Schiöedte & Meinert, 1884), female (24 mm), (ZSI/MBRC D1-538); g–i, Mothocya plagulophora (Haller, 1880), female (28 mm), (ZSI/MBRC D1-539); j–l, Mothocya renardi (Bleeker, 1857), female (30 mm), (ZSI/MBRC D1-540); m–o, Nerocila arres Bowman & Tareen, 1983, female (28 mm), (CAS/MBRM 475–476); p–r, Nerocila depressa Milne Edwards, 1840, female (30 mm), (ZSI/MBRC D1-541).

FIGURE 4. Mothocya plagulophora (Haller, 1880), female (28 mm), (ZSI/MBRC D1-539). a, dorsal view; b, lateral view; c, mouthpart with antennula and antenna; d, antennula; e, antenna; f, mandible; g, maxillula; h, maxilliped; i, maxilla.

FIGURE 5. Mothocya plagulophora (Haller, 1880), a, male (13 mm) (CAS/MBRM C-167) dorsal view; b–m, female (28 mm), (ZSI/MBRC D1-539); b–f, pereopod 1, 2, 4, 6 & 7; g–k, pleopods 1–5; l, uropod; m, brood pouch.

FIGURE 6. Nerocila depressa Milne Edwards, 1840, female (30 mm), (ZSI/MBRC D1-541). a, dorsal view; b, lateral view; c, forns; d, antennula; e, antenna; f, mandible; g, maxillula; h, maxilla; i, maxilliped.

FIGURE 7. Nerocila depressa Milne Edwards, 1840, female (30 mm), (ZSI/MBRC D1-541). a–e, pereopods 1–3, 5 & 7; f–j, pleopods 1–5; k, uropod.

FIGURE 8. a–c, Nerocila exocoeti Pillai, 1954, female (25 mm), (ZSI/MBRC D1-542); d–f, Nerocila longispina Miers, 1880, female (22 mm), (ZSI/MBRC D1-543); g–i, Nerocila loveni Bovallius, 1887, female (20 mm), (ZSI/MBRC D1-544); j–l, Nerocila phaiopleura Bleeker, 1857, female (26 mm), (ZSI/MBRC D1-545); m–o, Nerocila poruvae Rameshkumar et al. 2011, female (24 mm), (ZSI/MBRC D1-546); p–r, Nerocila serra Schiöedte & Meinert, 1881, female (28 mm), (CAS/MBRM–661).

FIGURE 9. Nerocila loveni Bovallius, 1887, female (20 mm), (ZSI/MBRC D1-544). a, dorsal view; b, lateral view; c, forns; d, uropod.

FIGURE 10. Nerocila loveni Bovallius, 1887, female (20 mm), (ZSI/MBRC D1-544). a, antennula; b, antenna; c, mandible; d, maxillula; e, maxilla; f, maxilliped; g, maxilliped article 3;

FIGURE 11. Nerocila loveni Bovallius, 1887, female (20 mm), (ZSI/MBRC D1-544). a–g, pereopod 1–7.

FIGURE 12. Nerocila loveni Bovallius, 1887, female (20 mm), (ZSI/MBRC D1-544). a–e, pleopods 1–5.

FIGURE 13. a–c, Nerocila sundaica Bleeker, 1857, female (24 mm), (ZSI/MBRC D1-547); d–f, Nerocila trichiura (Miers, 1877), female (30 mm), (ZSI/MBRC D1-548); g–i, Norileca indica (H. Milne Edwards, 1840), female (26 mm), (ZSI/MBRC D1-549); j–l, Norileca triangulata (Richardson, 1910), female (16 mm), (ZSI/MBRC D1-550); m–o, Ryukyua circularis (Pillai, 1954), female (13 mm), (CAS/MBRM C-227); p–r, Ryukyua globosa Williams & Bunkley-Williams, 1994, female (14 mm), (ZSI/MBRC D1-552).

FIGURE 14. Nerocila trichiura (Miers, 1877), female (30 mm), (ZSI/MBRC D1-548). a, dorsal view; b, lateral view; c, mouthpart with antennula and antenna; d, antennula; e, antenna; f, mandible; g, maxilla; h, maxillula; i,maxilliped.