Lepeophtheirus tamladus, Moon & Kim, 2012
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publication ID |
https://doi.org/ 10.5281/zenodo.13146305 |
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persistent identifier |
https://treatment.plazi.org/id/2718AB49-FF89-FFE8-14E5-E66DDE28FC09 |
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treatment provided by |
Felipe |
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scientific name |
Lepeophtheirus tamladus |
| status |
sp. nov. |
Lepeophtheirus tamladus View in CoL n. sp.
( Figs. 19 View Fig , 20 View Fig )
Material examined. 5¥¥, 1J from the skin of Sebastes inermis Cuvier , at Sagye, Jeju Island, M.-K. Choe, 5 July 2009. Holotype (¥) and paratypes (2¥¥) have been deposited in the National Institute of Biological Resources, Incheon. Dissected paratypes (2¥¥, 1J) are retained in the collection of the junior author.
Other specimens examined. 2JJ from Sebastes inermis Cuvier , st Sinheung in Jeju Island, M.-K. Choe, April 2010 .
Female. Body ( Fig. 19A View Fig ) 3.45 mm long. Cephalothoracic shield nearly circular, 2.17× 2.10 mm; lateral zone with arched, slender ventral rib; posterior sinus shallow; posterolateral pit on dorsal surface small; membrane on lateral margins very narrow. Fourth pedigerous somite fus- ed with genital complex. Genital complex nearly quadrish, 769×908 µm. Abdomen indistinctly 2-segmented ( Fig. 19B View Fig ); first segment 77×212 µm, much shorter than distal segment; distal segment 135×196 µm, with nearly parallel lateral margins. Caudal ramus 110×71 µm, 1.55 times as long as wide, with 6 setae; distal half of inner margin with setules.
Antennule ( Fig. 19C View Fig ) 2-segmented and 350 µm long; proximal segment occupying about 70% length of antennules bearing 27 setae; distal segment bearing 12 naked setae and 2 aesthetascs. Antenna 3-segmented ( Fig. 21E View Fig ); first segment with tapering proximal process; second segment nearly quadrangular, with 1 adhesion pad; third segment forming large distally strongly bent claw bearing 2 small setae. Postantennal process blunt ( Fig. 19D View Fig ), with 2 papillae each tipped with several setules; another papilla located posterior to postantennal process tipped with 6 setules.
Mandible with 12 teeth distally. Maxillule consisting of anterior papilla bearing 3 unequal setae and posterior process bearing 2 tines ( Fig. 19E View Fig ). Maxilla ( Fig. 19F View Fig ) 2- segmented; proximal segment (lacertus) unarmed; distal segment (brachium) longer than proximal segment, with flabellum at place slightly proximal to middle of inner margin; distal half of distal segment distinctly narrower than proximal half; calamus about twice as long as canna. Maxilliped ( Fig. 19G View Fig ) 3-segmented; first segment (corpus) moderately wide; second segment (shaft) short, with 1 distal seta; third segment forming strong claw, longer than second segment. Sternal furca ( Fig. 19H View Fig ) with slightly divergent tines; each tine with hyaline flanges along lateral margins.
Armature on rami of legs 1-4 as follows:
Leg 1: exopod 1-0; III,1,3; endopod (vestigial)
Leg 2: exopod I-1; I-1; II,I,5; endopod 0-1; 0-2; 6
Leg 3: exopod I-0; I-1; III,4; endopod 0-1; 6
Leg 4: exopod I-0; I-0; III; endopod (lacking)
Leg 1 ( Fig. 19I View Fig ) coxa with branched outer setule; basis with pinnate outer and inner setae. Proximal exopodal segment gradually narrowed distally, with 1 small outer distal seta and row of setules on inner margin; distal segment with nearly quadrangular; three distal spines each accompanied by flabelliform membrane; two inner distal spines with setiform subdistal process; distal seta pinnate; endopod rudimentary and pointed. Leg 2 ( Fig. 20A View Fig ) similar to that of L. parvulus . First exopodal segment of leg 3 with 3 setules on outer margin ( Fig. 20B View Fig ), its distal spine very large. Leg 4 ( Fig. 20C View Fig ) protopod slightly curved, with small outer distal seta; exopod slender and distinctly longer than protopod; distal spine on first segment very small; second segment longest among segments; 3 spines on distal segment distinctly unequal in length; all spines on exopodal segments accompanied with flabelliform membranes near base. Leg 5 represented by small papilla tipped by 1 seta and tapering plate bearing 3 setae and 1 inner process ( Fig. 19B View Fig ) on posterolateral margin of genital complex.
Male. Body 2.17 mm long, with large cephalothoracic shield and small urosome. Cephalothoracic shield similar to that of female, 1.43× 1.39 mm. Urosome ( Fig. 20D View Fig ) 0.75 mm long. Genital complex 395×333 µm. Genial flap extendingover posterior margin of genital complex. Abdomen 1-segmented, gradually broadened distally, and 154×175 µm. Caudal ramus 114×79 µm.
Antennule armed as in female. Antenna ( Fig. 20E View Fig ) 3- segmented as in female; first segment with 1 large and 1 small adhesion pads; second segment greatly expanded, with several adhesion pads; third segment with 1 proximal seta and 1 large subdistal claw and 2 distal smaller claws. Postantennal process ( Fig. 20F View Fig ) with more developed distal tine; proximal papillae each with 2 or 3 setules; posterior papilla with 3 setules.
Mandible and maxilla as in female. Maxillule ( Fig. 20G View Fig ) with 1 additional, aesthetasc-like process on inner side and 1 adhesion pad and accompanied posteromedially by 1 adhesion pad ( Fig. 20G View Fig ). Maxilliped ( Fig. 20H View Fig ) with 2 patches of granule-like minute tubercles on inner side of distal half of first segment. Sternal furca as in female.
Legs 1-4 as in female. Leg 5 represented by 4 setae on lateral lobe of genital complex ( Fig. 20I View Fig ). Leg 6 represent- ed by posterolateral process bearing 3 setae on genital complex.
Etymology. The specific name is derived from “Tamlado” the old name of Jeju Island, south Korea, the type locality.
Remarks. The new species has the following diagnostic characters: 1) the exopod of leg 4 is 3-segmented, with armatures of I-0, I-0, III; 2) the maxillule of female bears two tines on posterior process; 3) the caudal ramus is distinctly longer than wide; 4) the male maxilliped lacks any process on the medial margin of the first segment; and 5) leg 5 of female is plate-like, extending over the posterior margin of the genital complex. The above features are shared by four congeners: L. anguilli Hameed, 1976 ; L. chilensis Wilson, 1905 ; L. hastatus Shiino, 1960 ; and L. parvulus Shiino, 1952 . These four species may be distinguished from the new species by their following features.
In L. anguilli the female abdomen is wider than long and the tines of sternal furca are parallel. In L. chilensis the genital complex of the female is wider than long and the abdomen is distinctly 2-segmented. In L. hastatus the tines of sternal furca are narrow. In L. parvulus the genital complex of female is circular, the abdomen is much wider than long, the distal segment of maxilla is curved, and the tines of sternal furca are blunt at tip.
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