Diversity of intertidal, epibiotic, and fouling barnacles (Cirripedia, Thoracica) from Gujarat, northwest India Author Trivedi, Jigneshkumar N. Department of Life Sciences, Hemchandracharya North Gujarat University, Patan- 384265, Gujarat, India Author Doshi, Mahima Department of Life Sciences, Hemchandracharya North Gujarat University, Patan- 384265, Gujarat, India Author Patel, Krupal J. Marine Biodiversity and Ecology Laboratory, Department of Zoology, The Maharaja Sayajirao University of Baroda, Vadodara- 390002, Gujarat, India Author Chan, Benny K. K. Biodiversity Research Center, Academia Sinica, Taipei 115, Taiwan text ZooKeys 2021 2021-03-25 1026 143 178 http://dx.doi.org/10.3897/zookeys.1026.60733 journal article http://dx.doi.org/10.3897/zookeys.1026.60733 1313-2970-1026-143 A27C7BA5F20646A2B307167C99BBFDDD B7D64A6A5D2952569EC76E0235617F29 Striatobalanus tenuis (Hoek, 1883) Figures 2A-C , 4 Examined material. four specimens (BD: 9.43-13.59 mm ), LFSc.ZRC-157 ( 2 specimens on Murex ternispina Lamarck, 1822, one specimen on Babylonia spirata Linnaeus, 1758, and one specimen on Bufonaria echinata Link, 1807), Jakhau, Kachchh ( 23°11.30'N , 68°37.35'E ), 9 January 2020 , Gujarat , India , sandy shore, leg. M. Doshi. Diagnosis (modified from Chan et al. 2009 ). Shell composed of six plates, conical, white, orifice deeply toothed (Fig. 2B ). Scutum triangular, strongly sculptured on dorsal surface (Fig. 2C ). Tergum triangular with long and narrow spur, scutal margin concave, medial furrow present on dorsal side of tergum (Fig. 2C ). Scutal and tergal outer surfaces striated longitudinally. Maxilla triangular, covered with dense setae (Fig. 4A ). Maxillule not notched, with two large setae on upper region (Fig. 4B ). Mandible with five teeth excluding inferior angle, inferior angle blunt, 2nd and 3rd teeth bi-dentate (Fig. 4C-E ). Mandibulatory palp rounded with setae at tip and superior margin (Fig. 4F ). Labrum bullate shaped with distinct and deep notch having two prominent teeth on each side of cutting edge (Fig. 4G, H ). Figure 2. Gujarat barnacles A Striatobalanus tenuis (Hoek, 1883) on gastropod shell ( Murex ternispina Lamarck, 1822) B top view of Striatobalanus tenuis (BD: 11.28 mm) LFSc.ZRC-157 C external and internal view of scutum and tergum D Megabalanus tintinnabulum on shores LFSc.ZRC-182 E external and internal view of scutum and tergum F Amphibalanus amphitrite (Darwin, 1854), top view, (BD: 12.38 mm) LFSc.ZRC-181, external and internal views of scutum and tergum G Amphibalanus reticulatus (Utinomi, 1967), top view, (BD: 14.99 mm) LFSc.ZRC-158, external and internal views of scutum and tergum H Chelonibia testudinaria (Linnaeus, 1758) on crab Portunus sanguinolentus I Chelonibia testudinaria (Linnaeus, 1758), top view (BD: 5.33 mm) LFSc.ZRC-159, internal view of scutum and tergum J Lepas anatifera Linnaeus, 1758, (CL: 16.39 mm) LFSc.ZRC-162, a. Side view of capitulum K Lepas anserifera Linnaeus, 1758, (CL: 16.28 mm) LFSc.ZRC-183, Side view of capitulum. Figure 3. A Tetraclita ehsani LFSc.ZRC-184 on shores of Diu B Tetraclita ehsani , external and internal view of scutum and tergum C Tetraclitella karandei ASIZCR000454 on shores at Diu D shell of T. karandei E Tetraclitella karandei external and internal view of scutum and tergum F Chthamalus barnesi on shores G close up view of C. barnesi LFSc.ZRC-160 H Internal and external view of scutum and tergum of C. barnesi I Microeuraphia withersi LFSc.ZRC-161 (BD: 6.01 mm) J internal and external view of scutum and tergum of M. withersi . Figure 4. Striatobalanus tenuis (Hoek, 1883), (BD: 11.28 mm) LFSc.ZRC-157, Light microscopy on mouth parts A maxilla B maxillule C mandible D close up on the inferior angle of mandible E close up on the teeth of mandible F mandibulatory palp G labrum H close up view on the cutting edge of Labrum, showing the teeth. Scale bars in µm . Remarks. The specimens examined in the present study agree with the description given by Chan (2009) and Chan et al. (2009) . Striatobalanus tenuis closely resembles S. amaryllis (Darwin, 1854), but differs from the latter in the following characters: mandible with five equally spaced teeth (in S. amaryllis , the mandible has four teeth and the distance between the 3rd and 4th teeth is larger than the rest, Chan 2009 ); tergum triangular with short and wide spur (tergum narrow with beak produced apically in S. amaryllis , Chan 2009 ); and maxilla triangular, covered with dense setae (maxilla bilobed, elongated with dense setae on inferior margins in S. amaryllis , Chan 2009 ). Striatobalanus tenuis also differs from S. krugeri (Pilsbry, 1916) and S. taiwanensis (Hiro, 1939) in that it has a median furrow on its tergum. Worldwide distribution. This species has been reported from South Africa, East China Sea, South China Sea, Japan, the Philippines, Indonesia ( Chan 2009 ), Vietnam ( Poltarukha 2010 ) and India ( Krishnamoorthy 2007 ). Distribution in India. This species has been reported from Gujarat (present study), Tamil Nadu ( Krishnamoorthy 2007 ; Daniel 1956 ), Odisha (formerly Orissa) ( Nilsson-Cantell 1938 ), and Karnataka ( Nilsson-Cantell 1938 ).