Paramysis (Serrapalpisis) kosswigi Băcescu, 1948

Wittmann, Karl J., Ariani, Antonio P. & Daneliya, Mikhail, 2016, The Mysidae (Crustacea: Peracarida: Mysida) in fresh and oligohaline waters of the Mediterranean. Taxonomy, biogeography, and bioinvasion, Zootaxa 4142 (1), pp. 1-70 : 15-18

publication ID	https://doi.org/ 10.11646/zootaxa.4142.1.1
publication LSID	lsid:zoobank.org:pub:FA423164-276C-44B0-A417-8E97AC3DF0AA
DOI	https://doi.org/10.5281/zenodo.6088647
persistent identifier	https://treatment.plazi.org/id/03B9BA4E-1806-FFCD-CAF6-FF5DFBA1470B
treatment provided by	Plazi
scientific name	Paramysis (Serrapalpisis) kosswigi Băcescu, 1948
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Treatment

Paramysis (Serrapalpisis) kosswigi Băcescu, 1948 View in CoL

Figs 4 View FIGURE 4 , 5 View FIGURE 5

Paramysis (Mesomysis) kosswigi Băcescu, 1948 View in CoL : Mordukhai-Boltovskoi 1979.

Paramysis kosswigi: Băcescu 1954, 1966 View in CoL , 1985; Remane & Schlieper 1958; Mordukhai-Boltovskoi 1964a, b; Mauchline & Murano 1977; Komarova 1991 (partim); Kocataş et al. 2003 (partim); Daneliya & Petryashev 2011; Wittmann & Ariani 2011; ITIS 2014.

Mysis relicta: Dügel & Kazanci 2004 View in CoL .

Paramysis (Serrapalpisis) kosswigi: Anderson 2008 View in CoL ; Audzijonyte et al. 2008a; Daneliya et al. 2012; Mees 2014.

nec Paramysis kosswigi View in CoL (Black Sea records): Şerban et al. 2000; Şerban 2004; Skolka 2005; Audzijonyte 2006; Özbek & Ustaoğlu 2006; Porter et al. 2008; Akbulut et al. 2009.

Material examined (all from freshwater tributaries of the Aegean Sea in Turkey). 8 F ad. 8.7–11.1 mm, 29 M ad. 7.6–9.9 mm, 12 F subad., 8 M subad., 38 imm., 78 juv., Lake Işikli in Anatolia, 38.2667N 029.9254E, altitude 818 m, sea distance ca. 505 km GoogleMaps , 0.5–1 m depth, over sand, S = 0.1, 320 µS/cm, 24.4°C, pH 8.1, 7.24 mg O2/l, 10°d, 55 NTU, hand net, 11 June 2006, leg. K. J. Wittmann, NHMW reg . no. 25198, BMNH 2011.1754-1763, MZUT; 9 ad. spec. 8.0–11.0 mm, same hydrological system, Işikli springs (type locality), 38.3225N 029.8507E, altitude 835 m, Sept. 1998, leg. C. Aygen, MZH HLA GoogleMaps . 150700, HLA. 150701; 5 F ad., 9.5–10.5 mm, 4 M ad. 7.0–10.0 mm, 2 heads, drainage system of River Küçük Menderes , Oedemis [= Ödemiş, altitude ≈ 135 m], 38.24N 027.96E, 1971, leg. M. Băcescu, MGAB MYS 163 GoogleMaps .

Supplementary description. All features within the ranges indicated above for the genus and subgenus. Head dorsally convex (inflated). Antennal scale ( Fig. 4 View FIGURE 4 B) length is 2.6–3.6 times its maximum width; scale with smooth outer margin extending beyond terminal margin of antennular trunk in females but not so in males ( Fig. 4 View FIGURE 4 A); setose apex is 20–27% length of scale; small apical segment with five plumose setae ( Fig. 4 View FIGURE 4 B). Eyes large, dorsoventrally only weakly flattened; cornea hemispherical in dorsal view ( Fig. 4 View FIGURE 4 A); maximum diameter of cornea is 42–49% antennal scale length; outer basal edge of eyestalks with field of scales. Wedge-shaped subrostral process extends straight forward well beyond the short, evenly rounded rostrum ( Fig. 4 View FIGURE 4 A). This process is roughly triangular in dorsal view. Carapace ( Fig. 4 View FIGURE 4 A) with medium-sized, subtriangular, basally rounded, mid-dorsal, posterior emargination; carapace leaves 1.5–2 posterior thoracic somites dorsally exposed; mid-dorsally it shows traverse row of 15–23 pores in cardial position (above the heart), arranged in two roughly symmetrical subgroups, and 9–14 pores in cervical position. Median segment of mandibular palp with several smooth and a number of serrated setae along its outer margin; serration along anterodistal portion of setae ( Fig. 4 View FIGURE 4 D, E). First thoracic sternite with anteriorly directed, hairy median lobe contributing to the caudal closure of the mouth area in both sexes ( Fig. 4 View FIGURE 4 F, G); sternites 2–5 of adult males with median, apically rounded processes of different size and shape, equipped with hairs ( Fig. 4 View FIGURE 4 F); adult females without such processes but with hairs only on sternites 2–5 ( Fig. 4 View FIGURE 4 G); sternites 6–8 smooth, without humps, ridges or hairs in both sexes ( Fig. 4 View FIGURE 4 F, G). Thoracic endopods 3–8 each with 5-segmented tarsus showing very dense setation ( Fig. 4 View FIGURE 4 H); propodus three-segmented throughout; dactylus minute, cylindrical, with weak, mostly straight, but terminally curved nail. Paradactylar setae of endopods 3–8 sickle-shaped, their armature with denticles is stronger in females ( Fig. 4 View FIGURE 4 H, J) compared to males ( Fig. 4 View FIGURE 4 K) and successively decreases in both sexes from endopods 3 to 8. Paradactylar setae of endopods 5–8 with denticles only on proximal half; extension of denticles more variable, generally longer, in endopods 3, 4 ( Fig. 4 View FIGURE 4 H–K). Endopod 3 with inner (= rostral) paradactylar seta ( Fig. 4 View FIGURE 4 H–K) showing a heavy armature of 5–8 denticles (i.e. stiff secondary projections) along its median portions; proximal denticles smaller and in part weakly serrated; outer (= caudal) paradactylar seta with much weaker armature ( Fig. 4 View FIGURE 4 H) compared to the inner one. Merus of endopods 3–8 with 4–5 posterior bunches of setae. Penis with 3–4 short, barbed setae in subterminal position on caudolateral blade ( Fig. 5 View FIGURE 5 A). Pleopods of both sexes (for males in Fig. 5 View FIGURE 5 B–E) as described above for the genus. Male pleopod 4 ( Fig. 5 View FIGURE 5 C, D) with 7-segmented exopod and unsegmented endopod; second segment of its exopod with strong cuticularized ridge on rostral face. Such ridges are present in several species of Paramysis ; instead there is a distinct lobus at this spot in P. arenosa ( G. O. Sars, 1877) . In P. kosswigi the third segment of exopod 4 shows strongly oblique segmental borders with both its neighbouring segments; this obliquity appears stronger in lateral ( Fig. 5 View FIGURE 5 D) than in rostral ( Fig. 5 View FIGURE 5 C) view. Scutellum paracaudale linguiform, biconvex; terminally undulate to serrated ( Fig. 5 View FIGURE 5 F, G). Uropods ( Fig. 5 View FIGURE 5 H) normal, endopod is 74–80% length of exopod; endopods ventrally with 3–6 spines near inner margin between statocyst and 24–39% endopod length from tip; spines increasing in length distally. Statoliths composed of vaterite.

Telson ( Fig. 5 View FIGURE 5 J) subrectangular, slightly trapezoid, with very weakly curved, allusively S-shaped lateral margins; telson length is 1.8–2.1 times maximum width or 1.0–1.2 times length of sixth pleonite (measured along dorsal midline); lateral margins with 12–16 spines each, not counting the large apical spines; distal spine-free region between terminal and lateral spines extends over 14–21% length of lateral margins; telson terminally with wide subtriangular cleft that forms an angle of>120°; cleft is 7–10% telson length and does not reach the subterminal spines; cleft with convex margins on each symmetrical half; cleft lined by a total of 21–27 acutely pointed laminae.

Occurrence ( Fig. 6 View FIGURE 6 ). Paramysis kosswigi is a stenoendemic in the freshwater lake Işıklı in Anatolia, including its springs (type locality) and its effluent Büyük Menderes Nehri (Great Maeander) to the Aegean Sea (E- Mediterranean), also occurring in the near, roughly parallel system of Küçük Menderes Nehri (Little Maeander). Records from altitudes of 135 m (orig.) to 1007 m ( Kocataş et al. 2003) are acknowledged by the present authors. Previous records from the Turkish Black Sea coast appear doubtful (see ‘Discussion’).