Lourinia gocmeni, Karaytuğ & Sak & Alper & Sönmez, 2021

Karaytuğ, Süphan, Sak, Serdar, Alper, Alp & Sönmez, Serdar, 2021, Resolving the Lourinia armata (Claus, 1866) complex with remarks on the monophyletic status of Louriniidae, Monard 1927 (Copepoda: Harpacticoida), Zootaxa 5051 (1), pp. 346-386 : 363-372

Lourinia gocmeni sp. nov.

( Figs. 12–19)

Synonym. Lourinia armata ( Claus, 1866) sensu Alper et al. (2010) .

Type locality. Turkey, Çanakkale province, in washings of macroalgae from Karaağaçlı Cove / Gelibolu (N40.43955°, E26.45517°) .

Type material. Holotype ♀ collected on 29 September 2013, dissected on eight slides. Allotype ♂ collected on 29 September 2013, dissected on nine slides. Type material are deposited in the Natural History Museum, London.

Additional material examined. One ♂ from intertidal zone of Mandalya beach/ Datça / Muğla / Turkey (N36.703047°, E27.677761°), collected on 15 April 2007 . One ♀ in washings of the macroalgae from Denizyıldızı beach/ Demircili / Urla / İzmir (N38.209161°, E26.693545°), collected on 23 May 2012 . One ♂ from a pebbly beach/ Cunda Island / Ayvalık / Balıkesir / Turkey (N39.358361°, E26.623611°), collected on 06 July 2005 .

Description of female. Body shape ( Figs. 12A; 18A–C) similar to that of L. aff. armata . Total body length: 963 μm (mean = 917 μm; n = 2). Maximum width: 263 μm (mean = 237 μm; n = 2). Rostrum triangular, defined at base with two sensillae with serrate tip ( Fig. 12C–E). Surface of somites without microspinular ornamentation except for anal somite and caudal rami. Spinular ornamentation of genital double-somite, third and fourth urosomites similar to L. aff. armata ( Figs. 12B; 17A). Anal somite with one pair of sensilla dorsally; anal operculum straight, margin ornamented with setules ( Fig. 18E).

Antennule ( Fig. 13A) 7-segmented. First segment ornamented with spinule row as figured, with one seta. Second segment with eight setae. Third segment longest, with four setae. Fourth segment with one seta and with aesthetasc fused basally to seta on common pedestal. Fifth and sixth segments small, with one and two setae, respectively. Last segment with six setae and apical acrothek consisting of aesthetasc and two setae. Setal formula of antennule: 1–[1]; 2–[8]; 3–[4]; 4–[1 + (1 + ae)]; 5–[1]; 6–[2]; 7–[6 + acrothek].

Antenna ( Fig. 13B) coxa squarish, ornamented with spinule rows as figured. Allobasis ornamented with spinule row as figured. Exopod 1-segmented; with two apical setae. Endopod 1-segmented, ornamented with spinule rows as figured, lateral armature consisting of two spines, distal armature consisting of four spines (outer one fused basally to a small seta).

Mandible, maxillule, maxilla and maxilliped as in L. aff. armata .

P1 ( Fig. 14A). Spinular ornamentation of praecoxa, coxa and basis similar to L. aff. armata . Inner spine of basis extending to middle of second endopodal segment. Exopod 3-segmented; distal segment with one unipinnate inner seta, one unipinnate apical seta and two outer spines. Endopod 2-segmented, shorter than exopod; first segment with one distally pectinate inner seta; distal segment with two inner setae (proximal one distally pectinate) and one apical spine.

P2–P4 ( Figs. 14B; 15A–E). Intercoxal sclerites, praecoxae, coxae and bases similar to L. aff. armata . Exopods 3-segmented; inner margin of second and third segments ornamented with setules; second segment with one short plumose (P2) ( Fig. 14B) or one long, plumose (P3–P4) ( Fig. 15A–B) inner seta; distal segment with one plumose inner seta, two apical setae and three outer spines. Endopods 2-segmented, shorter than exopods; first segment with one short, distally pectinate (P2–P3) ( Figs. 14B; 15C) or one long, bipinnate seta (P4) ( Fig. 15E); second segment with three inner setae (two distally pectinate and one plumose), two apical setae (one short, naked and one long, plumose) and one outer spine (P2) or two plumose inner setae, two apical plumose setae and one outer spine (P3) or one distally pectinate inner seta, two apical plumose setae and one outer spine (P4).

Fifth pair of legs ( Figs. 13C; 18D) fused, baseoendopod well developed, outer basal seta naked. Endopodal lobe with six bipinnate elements; setae I–II spiniform; seta IV longest. Exopod distinct, ellipsoidal, with five long bare setae, seta III longest.

Sixth pair of legs ( Fig. 13D) covered by P5, with one bifid outer element, one proximally bipinnate seta and three small, apically serrate, inner elements.

Caudal rami ( Figs. 12A; 18E–F) about 1.3 times as long as broad, with six setae. Position of the setae similar to L. aff. armata . Spinules around ventral distal margin ( Fig. 17A) smaller than in L. aff. armata .

Description of male. Body ( Figs. 16A; 19A) cylindrical, tapering posteriorly; without microspinular ornamentation.Total body length about 733 μm (mean = 721 μm, n = 3). Maximum width: 180 μm (mean = 193 μm; n = 3). Ventral posterior margin ( Fig. 17B) of third and fourth urosomites with continuous row, fifth abdominal somite with paired rows of spinules; spinules irregular in size displaying peculiar pattern ( Fig. 19D). Sexual dimorphism in body size and spinular/microspinular ornamentation, antennule, P3–P4 endopods, P5 and P6.

Antennule ( Figs. 16B–D; 19B–C) 9-segmented, subchirocer. First segment ornamented with spinule rows as figured, with bare seta at inner distal corner. Second segment with nine setae. Third and fourth segments small, with six and one seta, respectively ( Fig. 16C). Fifth segment ( Fig. 16D) with aesthetasc fused basally to seta on common elongate pedestal. Sixth segment ( Fig. 16D) with six elements (four naked setae and two pectinate setae with tubelike extension distally). Seventh segment naked. Eighth segment with one seta. Distal segment ( Fig. 16B) with six setae and apical acrothek consisting of aesthetasc fused basally with two setae. Armature formula of antennule: 1–[1]; 2–[9]; 3–[6]; 4–[1]; 5–[1 + ae]; 6–[6]; 7–[0]; 8–[1]; 9–[6 + acrothek].

P3 endopod ( Fig. 15F) 3-segmented. First segment well developed, rectangular, with 1 short, distally pectinate, inner seta; second segment squarish, with one plumose inner seta and short harpoon-like apophysis. Length of apophysis about twice longer than distal segment. Distal segment rectangular, with two long, plumose apical setae.

P4 endopod ( Fig. 15G) 2-segmented. First segment squarish, with one distally pectinate, inner seta; second segment narrower than in female, ornamented with setules on inner margin, with two inner setae, two apical setae (one of them being minute) and one outer spine. Length of outer spine shorter than in female.

Setal formula of swimming legs as in L. aff. armata .

Fifth pair of legs ( Fig. 17B–C) fused; baseoendopod and exopod forming common plate. Exopodal lobe with five bipinnate and one inner unipinnate setae; endopodal lobe with three bipinnate setae; outer basal seta naked. Comparison of relative length of the exopodal setae as follows: III>IV>II>VI>I>V.

Sixth pair of legs ( Fig. 17B, D) asymmetrical; with three setae each (inner longest, medial seta bipinnate).

Variation. One female had an extra inner seta on the distal segment of the P3 endopod ( Fig. 15D).

Etymology. The new species is named in honour of the late Prof. Dr Bayram Göçmen for his contribution to reptile taxonomy.