Ichthyodiversity in southeastern Arabian Peninsula: Annotated checklist taxonomy, short description and distribution of Inland fishes of Oman Author Esmaeili, Hamid Reza 0000-0002-9736-397X hresmaeili @ shirazu. ac. ir; https: // orcid. org / 0000 - 0002 - 9736 - 397 X hresmaeili@shirazu.ac.ir Author Jufaili, Saud Al 0000-0002-0930-5754 Department of Marine Science and Fisheries, Sultan Qaboos University, P. O Box 34 Al Khod 123 Muscat, Oman. sjufaily @ squ. edu. om; https: // orcid. org / 0000 - 0002 - 0930 - 5754 sjufaily@squ.edu.om Author Masoumi, Amir Hassan 0000-0003-3509-2964 amirhassanmasoomi @ gmail. com; https: // orcid. org / 0000 - 0003 - 3509 - 2964 amirhassanmasoomi@gmail.com Author Zarei, Fatah 0000-0001-5552-4301 fataahzarei @ gmail. com; https: // orcid. org / 0000 - 0001 - 5552 - 4301 fataahzarei@gmail.com text Zootaxa 2022 2022-05-12 5134 4 451 503 journal article 55549 10.11646/zootaxa.5134.4.1 aa696fc1-e783-4df4-b960-24dfeca95570 1175-5326 6541567 47796EB6-B7FE-4442-AED3-E664DCC9A9B4 18. Ambassis gymnocephalus ( Lacepède, 1802 ) , Native, New record Fig. 44 Etymology: Ambassis : derived from Greek, anabasis = climbing up; gymnocephalus : short head. Common name: Bald Glassy. Taxonomy: Lutjanus gymnocephalus was described by Lacepède [B. G. E.] (ex Commerson) 1802:181, 216 [Histoire naturelle des poissons (Lacepède) v. 4] from Le grand Océan équinoxal or dans les parties de ce grand Océan voisines des tropiques” [Indo-Pacific]. Holotype : No types known. Synonyms: Lutianus gymnocephalus Lacepede, 1801 : PI . 23, fig. 3, 1802: pp. 181, 216 (Indo-Pacific). Ambassis gymnocephalus : Smith, 1961: 246 ; Hill, 1966: 22; Winterbottom, 1976: 62. FIGURE 44. Ambassis gymnocephalus a new fish record for the Oman inland waters. Short description: A large deep-bodied glassfish, with a relatively small head, dorsal-fin rays VIll, 8–10; anal-fin rays III, 8–10; pectoral-fin rays 14–15; lateral line interrupted, with 12–13 pored scales + 12–13; gill rakers (8–10) + (22–25); 2 rows of cheek scales. Supraorbital spines 1–5 (usually 3 or 4, Oman specimens 2 or 3); lower edge and angle of preopercle serrate; preopercle ridge completely serrate along lower limb; a large retrorse spine on preorbital just below anterior nostril; preorbital ridge smooth or serrate; interopercle smooth except for 1 or (rarely) 2 small spines. A row of minute teeth on vomer, palatines and tongue. General distribution: Indo-West Pacific: East and South Africa east to Philippines and New Guinea , north to Taiwan , south to Cairns ( Queensland , Australia ). Habitat: freshwater, brackish, marine. Distribution in Oman : Al Bahayes, Muscat Governorate ( Fig. 45 ). It is a richly vegetated Wadi, adjusted to the Oman Sea coastal area. Remarks: Ambassis gymnocephalus is a new fish record for the Oman inland waters. Examined material: ZM-CBSU: O006.Ag101, 14, Oman: Qurum, 23°37’38”N , 58°29’00”E , H.R. Esmaeili, S.M. Al-Jufaili, A.H. Masoumi, Sep. 2021 .