First record of the batfish, Halieutaea indica (Actinopterygii: Lophiiformes: Ogcocephalidae), from the Red Sea

The Indian handfish or batfish, Halieutaea indica Annandale et Jenkins, 1910, is recorded for the first time from the Red Sea. This report constitutes also the first record of the family Ogcocephalidae from this region.


Introduction
The batfishes (Ogcocephalidae) are benthic marine fish species found in tropical and sub-tropical regions. They are found on soft bottoms of the continental slope, most species between 200 and 1000 m depth, while a few species live in shallower waters among rocks or reefs (Bradbury 2003). Their diet includes small snails, small clams and scallops, a variety of worms and small crustaceans, and occasionally small fishes. As far as we know, eggs, larvae, and postlarvae are all pelagic, the postlarvae transparent, globular in shape, sometimes reaching 25 to 30 mm, metamorphosing upon settling to the bottom (Bradbury 2003). Nelson et al. (2016) estimated 78 species in ten genera, but later Prokofiev (2019 and 2020) added another two species. Fricke et al. (2021a) counted 90 valid species in ten genera. The genus Halieutaea Valenciennes, 1837, round batfish or handfishes include eleven valid species with a wide Indo-west Pacific distribution from South Africa east to the Hawaiian Islands, north to southern Japan, south to northern Australia (Prokofiev 2020;Fricke et al. 2021b). It was characterized by Bradbury (1967) as hav-ing, among other characters, the disk very flat and rounded, isolated lateral-line organs on ventral surface of tail present, teeth absent from palate, frontal bones forming a groove, but absence of small scales on ventral surface of tail, pupillary opercula, or bucklers.
While sorting old material from the Hebrew University Fish Collection, we were surprised to find a specimen of Batfish belonging to the family of Ogcocephalidae that was collected in February 1958 in the southern Red Sea. Consequently, it was identified as the Indian handfish, Halieutaea indica Annandale et Jenkins, 1910. This report constitutes the first record of this species and family in the Red Sea. The specimen was deposited in the Fish Collection of the Hebrew University (HUJ) and received the catalogue number HUJ 10625.

Materials and methods
Measurements and counts follow Hubbs and Lagler (1947). The vertebrae were counted using an X-ray.

Family Ogcocephalidae Gill, 1893
Halieutaea indica Annandale et Jenkins, 1910 (their  Description of HUJ 10625. Head and body round and depressed, width subequal to length. Upper surface and tail densely covered with broad-base tubercle spines, most of them bicuspid or tricuspid. Ventral surface sparsely covered with minute spinules. Tail round in cross section, its length four times in SL. Mouth with small fine teeth, its width 4.7 in SL. Eyes in dorsal position, their diameter 10.9 times in SL. Interorbital slightly depressed, 6.3 times in SL. Small dorsal fin in posterior position with four rays. Pectoral fins with shape of "elbow" with ten rays well distanced from each other, their length 3.1 times in SL. Prepectoral length 1.5 times in SL. Ventral fins with a single spine and four rays, its length 4.2 times in SL. Preventral distance 2.6 times in SL. 22 vertebrae.
Color. Dorsal surface grayish-brown, spines lighter in color, ventral surface light grayish-beige, pectoral and ventral fins brown.

Discussion
The characters of the Red Sea ogcocephalid specimen well agree with those of Halieutaea indica (see Table. 1).
Halieutaea indica was originally described by Annandale and Jenkins (1910: 19, pl. 2 ( fig. 4), based on 9 syntypes from the Bay of Bengal, off Orissa coast, India, northeastern Indian Ocean. The species is distinguished from its congeners by having the following combination of characters: broad-based, thorn-like spines on dorsal surface of disc long, closely-spaced, nearly uniform in size; those on tail as long as on disc; underside of disc sparsely covered by small bucklers (broad-based thorns); tooth patches on ceratobranchials-5 with long and pointed inner posterior extension; dorsal surface of disc with irregular patches of pigment or without pattern; pectoral fin unpigmented (Prokofiev 2020). This taxon was first described and illustrated as "La Lophie Faujas" by Lacepède (1798: 318, pl. 11, figs. 2-3), without a stated locality. The holotype is still extant (MNHN A.4542), but the name is not available, as it was based on a vernacular name only. The first Latinization was the description of Lophius muricatus by Shaw (1804: 382, pl. 162); this name is treated as a nomen oblitum, as it was not treated as valid after 1900, and its priority is reversed in favor of Halieutaea indica Annandale et Jenkins, 1910 (which is here declared a nomen protectum). The subsequent description of Astrocanthus stellatus by Swainson (1839: 331, fig. 108) is a secondary homonym and preoccupied by Lophius stellatus Vahl, 1797 when both are in Halieutaea.
The batfishes (Ogcocephalidae) are marine fish species found in tropical and sub-tropical regions. Nelson et al. (2016) enumerated 78 species in ten genera, but later Prokofiev (2019 and 2020) added another two species. The family Ogcocephalidae was not known  (Prokofiev 2020). Halieutaea indica has a wide Indo-west Pacific distribution from the western Indian Ocean, South Africa, Seychelles (Smith 1965), and recently recorded from the Gulf of Oman (Owfi et al. 2021) to northern Australia, China (Tchang and Chang 1964) and Japan (Kailola 1987;Kuiter and Tonozuka 2001) (Fig. 3). Halieutaea indica is a demersal species mostly found on muddy substrate to depths of 500 m. It "walks" on the sea floor using its "elbow-shape" pectoral fins. The IUCN Red List designated this species to be in the category of "Least Concern".
The family Ogcocephalidae was not known hitherto from the Red Sea. Halieutaea indica is apparently very rare in the Red Sea, since in the past six decades no other specimen has been collected. Alternatively, this can also be explained by its occupying a niche that has been rarely sampled. This is an interesting addition to the Red Sea ichthyofauna; this finding illustrates that the fish diversity of the southern Red Sea is still poorly known.