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First Record of the Triplefin Fish, Helcogramma Ellioti (Herre, 1944), from the Gulf of Oman, Iran (Blenniformes: Tripterygiidae: Tripterygiinae)

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First Record of the Triplefin Fish, Helcogramma Ellioti (Herre, 1944), from the Gulf of Oman, Iran (Blenniformes: Tripterygiidae: Tripterygiinae) Iran. J. Ichthyol. (2021) 8(3): 181-188 © 2021 Iranian Society of Ichthyology P-ISSN: 2383-1561; E-ISSN: 2383-0964 ORIGINAL ARTICLE First record of the Triplefin fish, Helcogramma ellioti (Herre, 1944), from the Gulf of Oman, Iran (Blenniformes: Tripterygiidae: Tripterygiinae) Maryam SHARIFINIYA1 , Hamed MOUSAVI-SABET1 , Mohammad Sadegh ALAVI-YEGANEH2 Mehdi GHANBARIFARDI3* 1 Department of Fisheries, Faculty of Abstract Natural Resources, University of First record of the Triplefin fish (Blenniiformes: Tripterygiidae), Helcogramma ellioti, is Guilan, Sowmeh Sara, Guilan, Iran. 2 reported here based on six specimens collected from Chabahar, northern Gulf of Oman in Faculty of Marine Science, Tarbiat February 2019. Identification was confirmed based on a series of morphological characters Modares University , Nur, Iran. 3Department of Biology, Faculty of including, a minute supraorbital tentacle, 3-5 symphyseal mandibular pores, a numerous number Sciences, University of Sistan and of scales in lateral line (36-37) and a low number of total lateral scale rows (38-39). Specimens Baluchestan, Zahedan, Iran. were found in coral reef areas at depths of 1-15 m of the Gulf of Oman in the Indo-Pacific region. Compared to the other members of Helcogramma, H. ellioti is regarded as a medium to sss Correspondence large body size species (25.0-57.0mm SL). Although several species of triplefin fishes have [email protected] been reported from the Persian Gulf, but, it is the first record from Tripterygiidae for the Iranian Article history: waters of the Gulf of Oman. Received 29 November, 2020 Keywords: Accepted 28 June 2021 Chabahar, Helcogramma ellioti, Morphology-based identification. Online 25 September 2021 INTRODUCTION dorsal fin with more spines than rays (vs. dorsal fin Tripterygiids (triplefins or threefin blennies) are with more, a few species with 0 to 3 less, segmented benthic blenniiform fishes (Nelson et al. 2016), than spinous rays). Having two dorsal fins (the first inhabiting subtidal and intertidal rock pools and coral spinous and the second with one spine and 5 to 37 reefs of the temperate, tropical and subtropical seas segmented rays) makes Eleotridae and Gobiidae (Fricke 1997, 2017). A total of 29 genera and 183 distinguishable from Tripterygiidae. Gobiidae have a species are known in this family (Fricke et al. 2021). united pelvic fin while they are separated in All species of this family are small and does not Tripterygiidae (Williams & Fricke 2001). exceed 150mm SL (Fricke 1997). Studies on the southern coasts of the Persian Gulf Tripterygiids are characterized by having ctenoid and the Gulf of Oman have confirmed representatives scales (rarely cycloid), three dorsal fins and loss of the of Tripterygiidae, including, Enneapterygius (3 posteriormost spine of the second dorsal fin (Fricke species), Helcogramma (2 species) and Norfolkia (1 1994, 1997, 2017). For a long time, tripterygiid fishes species) (Randall 1995; Carpenter 1997; Bishop were classified in Clinidae (Fricke 1997). This family 2003); however, none of them have reported H. ellioti. is similar to Blenniidae, Clinidae, Eleotridae and Revision of the blennioid fish of the family Gobiidae. Tripterygiidae differs from Clinidae by Tripterygiidae from Red sea resulted in recognition of having three clearly defined dorsal fins (vs. one or two H. obtusirostris and H. steinitzi (Holleman & clearly defined dorsal fins), middle rays of the caudal Bogorodsky 2012), the two species as same as records fin branched (vs. unbranched) and distinguish from from the Oman coasts. Helcogramma ellioti was Blenniidae with having scaly body (vs. naked), several described from Maharanepeta Beach, eastern coast of rows of the conical teeth, at least anteriorly in jaws (vs. India (Herre 1944). This species has been reported single row of incisors in each jaw), three clearly from Cape Comorion, southern of India (Talwar & defined dorsal fins (vs. single continuous fin, often Sen 1971), Gujarat and Karachi, western of India deeply notched between spinous and segmented rays), (Holleman, 2007; Manilo & Bogorodsky 2003). There Journal homepage: www.ijichthyol.org DOI: https://doi.org/10.22034/iji.v8i3.649 182 Sharifiniya et al./ First record of the Triplefin fish Fig.1. Sampling sites of Helcogramma ellioti (red triangle) from Chabahar (25.28 N, 60.66 E) and Ramin (25.27 N, 60.75 E), Gulf of Oman. has been no confirmation record of presence of the under a stereomicroscope. Mandibular pores were Tripterygiidae representatives for the Iranian waters of presented according to the Williams & McCormick the Persian Gulf and the Gulf of Oman. (1990) formula: right dentary + symphysial + left The present study's aim is to first record of the dentary. Color patterns were described from live and Triplefin fish, Helcogramma ellioti (Herre, 1944) preserved specimens. Maximum, minimum, mean and from the Gulf of Oman, Iran. standard deviation of morphometric characters were calculated using SPSS v.16.0 software. MATERIALS AND METHODS Specimen collection and morphological RESULTS examinations: Seven specimens of H. ellioti were Helcogramma ellioti (Herre, 1944) collected from the coastal waters of Chabahar and Elliot's triplefin Ramin in Iranian coast of the Gulf of Oman (Fig. 1). Tripterygion ellioti Fish from Chabahar (six specimens) and Ramin (one Herre, 1944: 49-50 (India: Maharanepeta Beach, specimen) was caught using Scuba diving (subtidal Vizagapatam; Waltair, 2 or 3miles further north; zone) and hand-net (intertidal zone), respectively. Lawson's Bay, north of Waltair; Lawson's Bay, 10 Since the specimen from Ramin is deposited in miles south of Trivandrum; abundant around rocks on alcohol, its morphological measurements are not all costs of peninsular India; holotype: CAS-SU compared by the other six specimens deposited in 38840). formalin. Specimens were recognized based on their Helcogramma indicus Talwar & Sen, 1971: 248-250, morphological characters using the available fig. l (India: Cape Comorin, Tamil Nadu). Recorded identification keys (Herre 1944; Hansen 1986; Fricke from Cape Comorin, Southern India. The species 1994, 1997; Holleman 2007). Counts and H. ellioti is distinguished by combination of the measurements follow Hansen (1986) and Fricke following characters: Dorsal fins: D1: III, D2: XIII, (1994, 1997). A total of 27 morphometric features D3: 10-11, second dorsal fin spine same height of first were measured using a digital caliper to the nearest one of first fin; anal fin I, 18-19; pectoral fins 16; 0.1mm. Then meristic characteristics viz. counts of the pelvic fins I, 2, spine short and hidden, segmented rays pectoral, pelvic, anal, caudal and the first, second and simple, partially united by membrane; segmented third dorsal fin elements, lateral line scales and the caudal fin rays 14, caudal fin base with only 1 row of mandibular pores of six specimens were counted scales; lateral line scales 36-37, ending under Iran. J. Ichthyol. (2021) 8(3): 181-188 183 a b c Fig.2. Photographs of Helcogramma ellioti. (a: Fresh male specimen of H. ellioti (TL = 44.2mm) from Chabahar, Northern Oman Sea; b: Preserved male specimen of Helcogramma ellioti (TL = 43mm) from Ramin, Northern Oman Sea and c: Fresh male specimen of H. ellioti (TL= 42.5mm) from Chabahar, Northern Oman Sea). posteriormost 8 dorsal-fin elements; head, abdomen, Color in life: Sexually dimorphic in color pattern. anal fin and pectoral-fin base naked; caudal fin base Male head dark brown on top with reddish above eye, with only 1 row of scales; mandibular pores formula black and blue below, blue and black ocellus on cheek, 5+3+5; supraorbital cirri small and simple; small and with narrow blue stripe from corner of mouth onto leaflike cirii on nasal; without cirri on nape; ctenoid preopercle, body brownish grey with four vertical pale scales; 3-4 irregular rows of fixed, slightly recurved saddles; first dorsal fin blue anteriorly with an orange conical teeth in Jaws, 2-3 irregular rows of conical blotch on the second membrane; second and third teeth on vomer and anterior ends of palantines. Table dorsal fins are translucent with blackish basal and 1 gives a summary of morphometric and meristic data yellow and red oblique semi-bars on rays; pectoral of the six specimens of H. ellioti from the Gulf of base translucent with a brilliant blue blotch Oman. The morphometric data are presented as surrounded by orange; belly and pelvic-fin orange; standard lengths. caudal fin translucent with dark base (Fig. 2a). 184 Sharifiniya et al./ First record of the Triplefin fish Table 1. Information of morphometric and meristic properties of Helcogramma ellioti from Chabahar (six specimens measured). Reference (Fricke, 1994) Proportion Min-Max Mean±SD (142 specimens examined) Weight (g) 1.01-1.98 1.54±0.42 - Morphometric characters (mm) Standard length 36.20-45.90 42.90±4.04 42-54.90 % in standard length Body height 43.35-45.30 41.73± 1.78 40.60-45.80 Head length 26.51-28.43 27.14± 0.97 29.20-30.30 Head height at nape 7-8.46 8.15 ±0.67 - SnoutEye diameter length 4.402.66-5.553.36 5.553.17 ±0.48±0.29 14.808.80-15.309.90 Postorbital distance 5-6.30 5.90±0.53 - Interorbital distance 2-2.40 2.26±0.15 1.60-1.80 Preorbital distance 2.20-2.80 2.66±0.26 6.40-6.70 Length of longest first dorsal fin spine 11.87-12.82 12.28±0.47 12.50-14.50 Length of second first dorsal fin spine 9.11-10.55 9.90±0.72 11.50-13.50 Length of third first dorsal fin spine 7.90-8.60 8.19±0.35 8-9.60 Length of first second dorsal fin spine 11.60-12.89
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