Joryma engraulidis ( Barnard, 1936 )

Martin, Melissa B., Tuah, Alia, Muhamad, Juariah H. & Bruce, Niel L., 2022, A review of the family Cymothoidae (Isopoda: Cymothooidea) infesting marine fishes from Malaysian waters, with new host and geographical records, Zootaxa 5222 (1), pp. 1-36 : 14-15

Joryma engraulidis ( Barnard, 1936)

( Fig. 9 A, B )

Joryma engraulidis .— Bowman & Tareen, 1983: 21.— Aneesh, Helna & Sudha, 2016: 1270–1277.— Aneesh, Helna, Trilles & Chandra, 2019a: 14–18, figs 9–12.— Ravichandran, Vigneshwaran & Rameshkumar, 2019: 29 , 30.

Not Joryma engralilidis .— Kazmi, Schotte & Yousuf, 2002: 110, fig. 100 [= Joryma hilsae ]. Unconfirmed report.— Veerappan & Selvamathi, 2009: 417.

Type material. Ovigerous female neotype (10.5 mm), National Zoological Collections of Zoological Survey of India ( NZC-ZSI C-7136 /2) (see Aneesh et al. 2019a) .

Type locality. Marina Beach, Chennai Bay of Bengal , India (see Aneesh et al. 2019a) .

Type host. From the host Thryssa setirostris (Broussonet, 1782) (see Aneesh et al. 2019a).

Material examined. 2 ovig. ♀ (9.30, 9.37 mm TL;6.56, 5.71 mm W), stretch of beach along the Institute of Oceanography and Environment, Universiti Malaysia Terengganu, 05°24.927’S; 103°5.2531’E, 8 March 2020, from the gills of Longjaw thryssa ( Thryssa setirostris ), coll. Yusri Yusuf ( UMT Crus 01194, 01195) .

Host. Only reported from Longjaw thryssa Thryssa setirostris (Broussonet, 1782) ( Barnard 1936; Aneesh et al. 2016, 2019a; present material).

Distribution. India, Devi River, Orissa Coast ( Barnard, 1936), Malabar Coast, Arabian Sea ( Aneesh et al. 2016), and Chennai, Bay of Bengal ( Aneesh et al. 2019 a, Ravichandran et al. 2019). Malaysia, South China Sea (present study).

Remarks. Joryma engraulidis is here reported as a new record for Malaysian waters and identified by dorsally conspicuous cephalon, reaching beyond pereonite 1; non-bilobed expansion of pereonite 1; broadly rounded pleotelson ( Aneesh et al. 2019a). Kazmi’s et al. (2002) figure of J. engraulidis from the host Sardinella sp. is different to J. hilsae but can be differentiated by the cephalon prominent dorsally and reaching margin of pereonite 1 expansion (vs. pereonite 1 anterolateral expansion bilateral and slightly bilobed; pleonites are not overlapping; pleotelson loosely rounded; uropods rami equal mandibular palp 3-segmented ( Rameshkumar et al. 2011).

Joryma hilsae was originally in the combination Agarna engraulidis Barnard, 1936 but was transferred to Livoneca engraulidis by Pillai (1964) and lastly to the genus Joryma by Bowman & Tareen (1983), but both of the latter authors expressed reservations about the species position in their generic diagnosis. Other than Barnard’s (1936) minimal description and figure, the type had to be located to resolve the genus conundrum and to redescribe the specimen to modern standards. Aneesh et al. (2019a) found no evidence for the existence of any type material, and therefore designated a neotype with detailed description of the species. The most recent keys to species of Joryma are those of Aneesh et al. (2019a) and Ravichandran et al. (2019).

Figures

FIGURE 9. Joryma engraulidis (Barnard, 1936). A, dorsal view; B, ventral view, ovigerous female (9.3 mm), (UMT Crus 01194). Scale: 5 mm.