Copidognathus brachyostomus Viets 1940

Copidognathus brachyostomus Viets, 1940 (Figs. 11A–C, Table 4) Morphology and notes Idiosomal lengths 275–280. Porose areolae and a pair of costae of dorsal plates with rosette pores. AD with three porose areolae and glp-1 on lateral margin of the plate. OC longer than wide, with two cornea. PD anteriorly ovate. Ds-1 on anterior edge of porose areaolae on AD. Pairs of ds-2 and ds-3 on striated integument. Glp lateral to costae of PD at the level of insertion of leg IV. Ds-4 and ds-5 on PD (Fig. 11A). AE with three setae and pair of epimeral pore. PE with one dorsal and two ventral setae. GP large almost rectangular, with a pair of genital acetabula and pair of setae (Fig. 11B). Gnathosoma longer than wide (1:0.6) with four segments (Fig. 11C). Leg chaetotaxy from trochanter to tarsus (bipectinated setae between parentheses, parambulacral setae and solenidia excluded): leg I: 1, 2, 3, 4, 5(1), 6; leg II: 1, 2, 3, 4, 4(1), 3; leg III: 1, 1, 2, 3, 5(1), 4; leg IV: 0, 1+2 (basifemur + telofemur), 3, 5(1), 3. Each of tibiae I to IV with one bipectinate setae ventromedially and one normal ventral setae. All legs with two lateral claws with accessory process but large pectines (oil immersion) and a small bidentate median claw. Remarks Bartsch (2001) reported C. brachyostomus from the Black Sea off the coast of Sinop, Türkiye. Later, Durucan (2019) recorded this species from Antalya (Finike) among macroalgae, and from Izmir (Urla) among oysters (Pinctata radiata). In the present study, the protonymph stage of the species is reported for the first time from Antalya. The external morphological characteristics of the specimens match those previously described from Sinop, Türkiye.