Amphibalanus reticulatus (Utinomi, 1967)

Trivedi, Jigneshkumar N., Doshi, Mahima, Patel, Krupal J. & Chan, Benny K. K., 2021, Diversity of intertidal, epibiotic, and fouling barnacles (Cirripedia, Thoracica) from Gujarat, northwest India, ZooKeys 1026, pp. 143-178 : 143

Amphibalanus reticulatus (Utinomi, 1967) Figures 2G , 6

Examined material.

Two specimens (BD: 14.99 mm and 14.35 mm), LFSc.ZRC-158, Jakhau, Kachchh (23°11.30'N, 68°37.35'E), 9 January 2020, Gujarat, India, rock surface, leg. M. Doshi.

Diagnosis

(modified from Chan et al. 2009). Shell conical surface smooth, having purple, pink, and white longitudinal stripes which intersect with transverse striations, operculum diamond-shaped (Fig. 2G ). Scutum triangular with scutal margin straight (Fig. 2G ). Tergum with straight occludent margins and short spur (Fig. 2G ). Maxilla bilobed with margins bearing dense setae (Fig. 6A ). Maxillule not notched (Fig. 6B ). Mandible with four teeth excluding inferior, inferior angle blunt, 4th teeth bidentate (Fig. 6C-E ). Mandibulatory palp with setae only on superior margin (Fig. 6F ). Labrum with a deep cleft and four teeth on each side of cutting edge (Fig. 6G, H ).

Remarks.

The specimens examined in the present study agree with the descriptions and illustrations given by Chan et al. (2009) and Pochai et al. (2017). Amphibalanus reticulatus is very similar to A. variegatus (Darwin, 1854), in which both shells have striated patterns. Pitriana et al. (2020) illustrated the scutum, tergum, and mandibles of A. variegatus . The gaps between the teeth in the mandibles are smaller in A. variegatus than in A. reticulatus . In the present study, we concluded the mandibles of the specimens collected from India have relatively larger gaps between the teeth compared to the illustration in Pitriana et al. (2020). In addition, the tergum of A. variegatus illustrated in Pitriana et al. (2020) has a sharp spur, while the spur of the Indian specimen is blunt. We conclude the specimens collected in the present study represent A. reticulatus .

Worldwide distribution.

This species has been reported from Japan, Indo-West Pacific (the Philippines, Hawaii, Gulf of Thailand, Indonesia; Chan et al. 2009; Pochai et al. 2017), Australia, Persian Gulf, and India ( Fernando 2006).

Distribution in India.

This species has been reported from Gujarat (present study), Maharashtra ( Swami et al. 2011), and Tamil Nadu ( Fernando 2006).

Figures

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 6. Amphibalanus reticulatus (Utinomi, 1967), (BD: 14.99 mm), LFSc. ZRC- 158, 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.