Diamysis hebraica Almeida Prado-Por, 1981

Fig. 17 K–Q

Diamysis bahirensis hebraica Almeida Prado-Por, 1981: Herbst & Mienis 1985; Por & Dimentman 1985, 1989; Ben-Eliahu 2008; ITIS 2014; Mees 2014.

Diamysis hebraica: Ariani & Wittmann 2000: 2004; Ariani 2004; Daneliya et al. 2012; Wittmann & Ariani 2012a, b.

Material examined. Holotype F ad. with body length 4.0 mm (HUJ: reg. no. ICr62, HUJINVCRUMYS3), one paratype M ad. 4.0 mm (HUJ: ICr63, HUJINVCRUMYS3), Levantine Sea, Mediterranean coast of Israel, brackish stream Nahal Tanninim and its springs, S = 0.7–1.8, 200 µm mesh hand net, Jan.–Feb. 1980, det. Almeida Prado- Por; 8 M ad. 4.1–5.5 mm, 21 F ad. 4.9–6.2 mm, 1 F subad. 4.6 mm, three stations along the same coastal stream as before, 32.5491N 034.9146E to 32.5487N 034.9136E, 2.0– 1.9 km to the sea, 0.1–1 m depth, among filiform green algae, S = 3–5, 18°C, very small hand net, 18/20 Dec. 2008, leg. K. J. Wittmann, NHMW 25708.

Supplemented diagnosis. Cornea diameter large, 70–90% the length of eyestalk (Fig. 17 K). Antennula of males with appendix masculina pointing obliquely forward to inward; this appendix 90–126% the length of the terminal segment of antennular peduncle. Rostrum well rounded or forming a wide convex angle with broadly rounded tip. Carapace without fringes (Fig. 17 K) in both sexes. Palpus of maxilla with subcircular terminal segment, armed with 9–16 denticles along distal margin. Basis of all thoracic exopods terminally rounded (Fig. 17 M). Thoracic endopod 3 with 2–3-segmented carpopropodus; this carpopropodus longer than 5 times its maximum width (Fig. 17 L); thoracic endopods 3–8 with long and slender claw. Penis short, with smooth setae only. Male pleopod 4 biramous with 2-segmented sympod, with small, 2-segmented endopod, and with moderately long, rod-like, 2-segmented exopod (Fig. 17 N) bearing a long modified seta at tip and a shorter, smooth seta subterminally on the basal segment. Scutellum paracaudale sinusoid (Fig. 17 O) to triangular with blunt tip (Fig. 17 P), i.e. not ending in a spiniform process as in the otherwise similar D. bahirensis (G. O. Sars, 1877). Endopod of uropod with one spine below large statocyst; statolith composed of vaterite. Telson (Fig. 17 Q) subtriangular, 0.7– 0.9 times length of last abdominal somite; with lateral margins slightly sinusoid, maximum width is 2.0–2.7 that at apex. Apical cleft is 10–13% telson length, cleft with straight to slightly convex margins, bottom of cleft angular; cleft lined by 8–13 laminae (Fig. 17 Q).

Supplements to the description by Almeida Prado-Por (1981). Flagellum of thoracic exopod 1 with 8 segments, whereas exopods 2–8 each with 9 segments, not counting the large intersegmental joint between basis and flagellum which may be mistaken as a segment. Thoracic endopods 3 and 4 each with 2–3-segmented carpopropodus, endopods 5–8 with 2-segmented carpopropodus. Penis with 5–8 smooth setae close to ejaculatory opening. Male pleopod 4 with field of scales on inner face of terminal segment of sympod; basal segment of endopod with terminally setose exite; terminal segment of endopod is slender, with plumose setae all along its distal 60–75%. Endopod of uropods is 73–75% length of exopod. Statolith diameter 118–142 µm. Lateral margins of telson each with 6–10 spines, not counting the larger terminal spines.

Distribution (Fig. 6). According to Herbst & Mienis (1985) known from three coastal streams leading to a stretch of about 40 km along the Mediterranean coast of Israel: Nahal Qishon, N. Daliya, and N. Tanninim. Type locality is the stream Tanninim, where the species lives in the salinity range of 0.7–5, mostly at 1–4. It was not found in the freshwater section of this stream (Herbst & Mienis 1985; inspection by one of us, KJW, in Dec. 2008).