Wellsopsyllus (Wellsopsyllus) egregius, Back, Jinwook & Lee, Wonchoel, 2014
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|Wellsopsyllus (Wellsopsyllus) egregius|
Type locality. Gosapo Beach on the Byeonsan peninsula, on the west (Yellow Sea) coast of Korea. Coordinates: 35 ° 39 ' 51 ''N, 126 ° 30 ' 35 '′E ( Figure 1View FIGURE 1). Sediment type: sand. Salinity 33 psu.
Material examined. Holotype, 1 ♀ ( MABIK CR00218007) dissected on 7 slides. Paratypes: 1 ♂ ( MABIK CR00218008) dissected on 3 slides, 5 ♀♀ ( MABIK CR00218009) and 2 ♂♂ ( MABIK CR00218010) in 70 % alcohol. October 3, 2010.
Description of female. Total body (Figure 2 A –B) length, 462 µm (n = 6, mean = 460 µm), measured from anterior tip of rostrum of cephalic shield to posterior margin of caudal rami (Figure 2 A –B)); largest width measured at posterior margin of cephalic shield: 51 µm. Body cylindrical, depressed dorsoventrally; urosome gradually tapering posteriorly (smallest width of last somite: 21 µm) with a weak hyaline frill.
Rostrum (Figure 2 A), small, fused to cephalothorax, without sensilla. Cephalothorax (Figure 2 A –B), bellshaped; pleural areas weakly developed and posterolateral angles rounded; posterior margin, smooth, with a distinct hyaline frill.
Genital somite and first abdominal somite (Figure 2 A –B), completely fused forming a genital double-somite; genital field located mid-ventrally approximately halfway along the length of the genital double-somite. Copulatory pore ( Figure 5View FIGURE 5 B) located near posterior border of genital field, covered by a small process and enclosed within a depression. P 6 ( Figure 5View FIGURE 5 B) represented by a small process with 1 bare and 1 unipinnate setae. Pseudoperulum, weakly developed (Figure 2 A).
CR (Figure 2 D 1 –D 2), juxtaposed, approximately 2.8 times longer than greatest width, posterior inner margin acute, distal margin rounded inwardly, and with a small process near seta V. Each ramus armed with 6 setae: seta I bare; setae II bare; seta III blunt, ornamented with stout spinules; seta IV pinnate; seta V blunt, pinnate; seta VI not observed and probably represented by a small process; seta VII bi-articulate at base and arising sub-distally from inner dorsal surface.
A 1 (Figure 2 C), 8 -segmented, short, robust. Segment- 1 longest with a blunt process; segment- 4 with a subcylindrical process with 1 long slender seta fused basally to aesthetasc; segment- 6 with 1 slender bare seta arising from a ventral sub-cylindrical process. Armature formula: 1 -[1 pinnate], 2 -[7 bare + 2 pinnate], 3 -[2 bare + 4 pinnate], 4 -[1 bare + (1 + ae)], 5 -[2 bare], 6 -[2 bare], 7 -[3 bare], 8 -[4 bare + acrothek]; apical acrothek consisting of a well-developed aesthetasc fused basally to 2 slender setae.
A 2 ( Figure 3View FIGURE 3 A), 4 -segmented, comprising coxa, basis, 1 -segmented exp, and 2 -segmented free enp; coxa small and bare; basis approximately 1.7 times longer than wide, without any surface ornamentation; proximal endopodal segment with 1 pinnate abexopodal seta; distal endopodal segment ornamented with 2 rows of spinules on surface and armed with 1 lateral bare seta, 2 bare spine-like setae sub-distally, 5 geniculate distal setae, one of which was fused basally to long slender seta; exp 1 -segmented, with 2 bare setae laterally, 1 bare seta at distal corner, and 1 bifid seta apically.
FIGURE 2. Wellsopsyllus (Wellsopsyllus) egregius sp. nov., female: (A) Habitus, dorsal; (B) habitus, lateral; (C) antennule; (D) D 1: left caudal rami, dorsal; D 2: seta VII.
FIGURE 4. Wellsopsyllus (Wellsopsyllus) egregius sp. nov., female: (A) P 1; (B) P 2; (C) P 3; (D) P 4.
FIGURE 6. Wellsopsyllus (Wellsopsyllus) egregius sp. nov.: (A) male habitus, dorsal; (B) male antennule; B 1: segments 1 to 4; B 2: segments 5 to 7; (C) female maxillule.
Mandible ( Figure 3View FIGURE 3 B 1 –B 2), coxa with well-developed gnathobase bearing 1 small bare seta at the dorsal corner and 7 major blunt overlapping teeth; palp biramous, comprising basis, 1 -segmented exp and 2 -segmented enp; basis widening distally, without armature; exp with 2 distal bare setae; enp elongated, approximately 3 times as long as exp; enp- 1 with 2 bare sub-distal setae; enp- 2 with 6 basally fused bare setae at apex.
Maxillule (Figure 6 C), praecoxal arthrite well developed, with 6 spines, 1 bare seta at distal corner, 1 slender seta on lateral margin, and 2 juxtaposed slender setae on anterior surface; coxa with cylindrical endite bearing 4 bare setae; basis cylindrical; endites fused, with 1 pinnate and 5 bare setae; exp 1 -segmented, small, with 2 bare setae; enp 1 -segmented, elongate, with 1 pinnate and 3 bare setae.
Maxilla ( Figure 3View FIGURE 3 C), syncoxa with 3 cylindrical endites; praecoxal and proximal endites with 1 pinnate and 1 bare setae; distal coxal endite with 1 bare and 2 pinnate setae; allobasis with 1 strong claw-like spine, 1 pinnate and 1 bare setae distally, and 1 pinnate seta near base of enp; enp 1 -segmented, with 1 claw-like spine, 3 pinnate setae, and 1 bare seta distally.
Maxilliped ( Figure 3View FIGURE 3 D) 4 -segmented, comprising syncoxa, basis, and 2 -segmented enp; syncoxa and basis bare; enp- 1 with 1 stout seta distally; enp- 2 with 2 lateral bare and 2 geniculate setae.
P 1 (Figure 4 A), basis with 1 outer and 1 inner bare setae; exp- 1 approximately 1.8 times longer than exp- 2, the former with 1 long pinnate seta near outer distal corner and ornamented with a row of long spinules horizontally in middle of segment; exp- 3 with 4 long pinnate setae distally; enp prehensile; enp- 1 elongate, about 1.2 times longer than exp, bare, inner distal corner forming a small projection; enp- 2 small, with 1 geniculate seta apically and ornamented with a row of spinules around outer distal margin.
P 2 –P 3 (Figure 4 B –C), basis with 1 outer bare seta and ornamented with 1 pore and 1 row of spinules in middle. exp 3 -segmented; exp- 1 and 2 with 1 outer spine; exp- 3 with 1 spine and 1 geniculate seta; enp 1 - segmented, small, without ornamentation, represented by a small process.
P 4 (Figure 4 D), basis with 1 outer bare seta and ornamented with 1 pore and 1 row of spinules in middle. exp 3 -segmented; exp- 1 and 2 with 1 outer spine at distal corner; exp- 3 with 1 naked outer spine and 1 geniculate seta; enp 1 -segmented, with 1 stout unipinnate apical seta.
Benp of P 5 ( Figure 5View FIGURE 5 A) confluent, with 1 naked basal seta, an acute outer process, and one pore; fused endopodal lobes with a small bilobed process in middle; each endopodal lobe with 2 bare setae; exp clearly separated from benp, small, quadrilateral, with 2 bare and 1 pinnate setae.
Description of male. Body (Figure 6 A), slightly smaller and more slender than female, body length 385 µm (measured from anterior margin of cephalic shield to posterior margin of caudal rami: n = 3, mean = 381 µm), largest width measured at posterior margin of cephalic shield: 44 µm; general body shape and ornamentation as in female except for separation of genital somite; additional sexual dimorphism in A 1, P 5, and P 6.
A 1 (Figure 6 B 1 –B 2), 7 -segmented, subchirocer; armature formula: 1 –[1 pinnate], 2 –[8 bare + 2 pinnate], 3 –[5 bare + 1 pinnate], 4 –[1 bare + 1 pinnate], 5 –[6 bare + 1 modified stout + (1 + ae)], 6 –[4 bare], 7 –[6 bare + acrothek], apical acrothek consisting of small aesthetasc fused basally to 2 bare setae.
P 5 ( Figure 5View FIGURE 5 C), benp of P 5 confluent, with 1 bare basal seta, 1 pore, and acute outer process; endopodal lobe flat without armature; exp discrete, with 2 bare and 1 pinnate setae.
P 6 ( Figure 5View FIGURE 5 D), pair of P 6 asymmetrical, not confluent; each P 6 with 1 naked seta.
Etymology. The specific name ‘ egregius’ means ‘shocking’ in Latin and refers to the unusual shape of the caudal rami.
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