Fig.2. Trigon forskali
Fig.1. Trigon lymma

Date between 1826 and 1828
Source Atlas zu der Reise im nördlichen Afrika / https://www.biodiversitylibrary.org/page/37141020
Author Philipp Jakob Cretzschmar; Carl Heinrich Georg von Heyden; F. S. Leuckart; Eduard Rüppell; Senckenbergische Naturforschende Gesellschaft.
Source: https://commons.wikimedia.org/wiki/File:Atlas_zu_der_Reise_im_n%C3%B6rdlichen_Afrika_BHL37141020.jpg

2. Trigon forskalii = cowtail stingray (Pastinachus sephen)
The cowtail stingray (Pastinachus sephen) is a species of stingray in the family Dasyatidae, widespread in the Indo-Pacific region and occasionally entering freshwater habitats. Other common names include banana-tail ray, drab stingray, fantail ray, feathertail stingray, and frill tailed sting ray. The most distinctive characteristic of the cowtail stingray is the large, flag-like ventral fold on its tail, which is especially prominent when the ray is swimming. Order: Myliobatiformes > Family: Dasyatidae > Genus: Pastinachus > Species: Pastinachus sephen

1. Trigon lymma = bluespotted ribbontail ray (Taeniura lymma)
The bluespotted ribbontail ray (Taeniura lymma) is a species of stingray in the family Dasyatidae. This species is common throughout the tropical Indian and western Pacific Oceans in nearshore, coral reef-associated habitats. Taeniura lymma is a fairly small ray, not exceeding 35 cm in width, with a mostly smooth, oval pectoral fin disc, large protruding eyes, and a relatively short and thick tail with a deep fin fold underneath. The bluespotted ribbontail rays can be easily identified by their striking color pattern of many electric blue spots on a yellowish background, with a pair of blue stripes on the tail. Order: Myliobatiformes > Family: Dasyatidae > Genus: Taeniura > Species: Taeniura lymma