Oratosquillina perpensa

Oratosquillina perpensa (Kemp, 1911) (Fig. 4A) Squilla oratoria var. perpensa Kemp, 1911: 98. Oratosquilla perpensa.— Manning 1978c: 21–23, fig. 11. Oratosquillina perpensa.— Manning 1995: 234.— Ahyong 2001: 285–286.— Ahyong & Naiyanetr 2002: 301.—Ahyong et al. 2008: 164–165, figs. 133, 134.— Ahyong 2016: 467, fig. 5C.— Trivedi et al. 2020: 229. Material examined. FSI/VIZAG/CRUST. 229, 1 female (TL 98 mm), 17°43.1’N, 83°32.3’E, 53–54 m, coll. K. Silambarasan, 10 February 2019. Remarks. Oratosquillina perpensa is similar to O. inornata in most features but readily differentiated by the length and shape of the rostral plate. In O. perpensa, the rostral plate is relatively short and squarish, whereas, in O. inornata, it has a rectangular elongated form. Furthermore, a significant difference lies in the degree of surface pitting: it is finely and evenly distributed in O. inornata, while it is coarse in O. perpensa. Additionally, the shape of the anterior lobe of the lateral process of thoracic somite 6 differs: quadrate in O. inornata and triangular in O. perpensa (Ahyong 2001). Distribution. India to Malaysia, Thailand, China, Taiwan, and Japan (Ahyong et al. 2008).