Cymadusa herrerae n. sp. (Figs. 1-3)
Diagnosis
Eye with ommatidia devoid of color; anteriorly concave cephalic lobe; antenna 1 reaching pereonal segment 6 of body; antennal gland well developed on base of antenna 2; outer lobe of maxilla 2 widest proximally; coxa 1 with sparse setae on ventral margin; gnathopods 1-2 with article 6 larger than 5, each with palmar robust setae; article 2 anterior margin on gnathopod 1 with 2 distal setae; gnathopod 2 article 5 posterior lobe with dense tuft of parallel, long setae; pereopod 5 reaching proximal half of article 5 of pereopod 7; pereopod 5 article 6 posterior margin devoid of setae; uropod 1 interramal spine 0.5 times as long as outer ramus; telson truncate distally; uropod 3 peduncle longer than rami; inner ramus longer than outer one, with 2 robust setae on inner ramus, a tuft of 4 setae and 1 robust seta distally on inner ramus; tip of outer ramus with 2 hooks turned downward; telson truncate distally.
Holotype, adult female (CNCR 28285); body length 7.7 mm. Lateral view (Figs. 1A and 2A). Rostrum lacking; eye almost round, with more than 50 ommatidia; cephalic lobe anterior margin clearly concave; coxae 1-5 wide and deep; coxa 5 deepest, bearing small posterior lobe; coxae 1-5 ventral margin covered with sparse setae; coxae 6 and 7 very small.
Antennae (Fig. 1A): antenna 1 reaching pereonal segment 6; article 1 shorter than head; article 2 longer than 1; article 3 less than half-length of 2; accessory flagellum 2-articulate, article 2 vestigial, 0.6 times as long as article 1 of flagellum; flagellum 33-articulate, each article with 2 short setae above and 1 below. Antenna 2 shorter than 1; antennal gland well developed; peduncle article 4 longer than 5; flagellum 22-articulate, longer than length of articles 1-5 of peduncle combined.
Mouthparts (Fig. 1B-G): mandibles with well-developed molar process; palp inserted at same level as molar, 3-articulate, article 1 short, article 2 with a subdistal and 5 distal setae, article 3 bearing 10 distal long setae. Right mandible with 6 incisors, lacinia mobilis with 6 teeth, spine row with 7 accessory setae; left mandible with 7 incisors, lacinia mobilis with 5 teeth, spine row with 6 accessory setae. Maxilliped inner lobe narrower than outer one, with 7 distal and 6 inner marginal setae; outer lobe 2 times longer than inner one, with 13 marginal setae; palp article 2 with 10 long marginal setae, and 2 submarginal ones; article 3 half-length of article 2, with 1 robust, 6 simple and 1 pectinate setae distally; article 4 shorter than 3, with 1 distal and 2 subdistal setae. Lower lip with mandibular lobes well developed; outer lobes with typical inner notch on "shoulders"; inner lobe rounded, covered with small setae distally. Maxilla 1 inner lobe with 5 plumose setae; outer lobe bearing 9 robust setae; palp 2-articulate, article 2 with 12 distal, 3 subdistal, and 3 medial setae. Maxilla 2 inner lobe widest proximally, with 17 long setae distally; outer lobe covered with 15 marginal setae and 7 facial setae.
Gnathopods (Fig. 2B-C): ventral margin of coxa 1 with sparse setae; gnathopod 1 smaller than 2; article 2 posterior margin with few long setae; anterodistal corner with 2 small ones; articles 3-4 subequal in length; article 4 with posterior right angled lobe; article 5 shorter and narrower than 6, with posterior rectangular lobe bearing 5 long and 5 short setae; article 6 subtriangular, palm oblique, margin defined with a strong robust seta, covered with 4 long and 14 short setae, dactylus surpassing palm slightly. Gnathopod 2 article 2 posterior margin with 6 short setae; distal anterior margin bearing 1 distal and 1 subdistal small setae; article 4 forming round posterior lobe, covered with 2 tufts of setae; article 5 posterior rectangular lobe lined with long parallel setae; article 6 longer than 5; palm oblique, defined with a strong robust seta and a small notch; with 15 marginal setae.
Pereopods (Figs. 2D-F and 3A): pereopod 3 article 2 as long as 3-5 combined, with 2 long and 3 short setae on posterior margin; article 4 shorter than 5, with small lobe on anterior margin, with 1 long and 4 short setae on posterior margin, and 1 short and 1 long seta on tip of anterior lobe; article 5 bearing 2 setae on anterior margin, and 6 short and 5 long setae on posterior margin; article 6 longer than 5, with 1 seta on anterior margin, 5 on posterior margin and 3 on anterodistal corner; dactylus less than half-length of article 6, naked. Pereopod 4 similar to 3, except article 4 anterior lobe bigger. Pereopod 5 article 2 wide and rounded, with 1 robust seta at posterodistal margin; article 4 longer than 5, with 1 posterodistal and 4 anterodistal setae; article 5 shorter than 6, with long seta on posterior margin and 2 on anterior one; article 6 as long as article 2, with 4 robust setae on anterior margin, 1 big and 1 small setae on posterodistal corner and 4 long subdistal setae; dactylus curved and short. Pereopod 6 missing in the holotype. Pereopod 7 article 2 narrow, as long as articles 3 and 4 combined; with 4 short setae on posterior margin and 2 robust setae on anterior one; article 4 longer than 5, with tuft of 3 setae midway and another of 5 long setae on posterodistal corner; with 2 setae midway and 2 long and 1 short setae on anterodistal corner; article 5 with a tuft of 7 setae on posterodistal corner and 3 on anterodistal one; article 6 longest, with 8 robust setae on posterior margin, 3 long distal setae and another 6 on anterodistal corner; dactylus curved and shorter than half-length of article 6.
Uropods (Fig. 3B-D and F): uropod 1 inner margin of peduncle with 6 robust setae; outer with 4; distoventral spur less than half-length of outer ramus; outer ramus with 3 robust setae on outer margin, 1 on inner margin, and 1 long and 1 short distal robust setae; inner ramus with 1 robust setae midway on both inner and outer margins, and 2 long and 2 short robust setae distally. Uropod 2 inner margin of peduncle with 2 subterminal robust setae; outer margin with 1 distal robust seta; outer margin of outer ramus with 3 robust setae, 1 long seta and 2 short robust setae distally; 3 robust setae on inner and outer margins; outer margin of the inner ramus with 1 midway robust setae, 2 long and 4 short distal robust setae, and 3 robust setae on inner margin. Uropod 3 peduncle longer than rami; inner ramus longer than outer, with 2 robust setae on inner ramus, a tuft of 4 setae and 1 robust seta distally on inner ramus; tip of outer ramus with 2 hooks turned downward.
Epimera (Fig. 1A) 1-3 naked; epimeron 3 posteroventral angle slightly produced.
Telson (Fig. 3E and F) as long as wide; distal margin truncate and sinuous, with 1 upturned tooth on each distal corner, 2 long subdistal setae and some others submarginally inserted.
Gills (Fig. 2C and D) plates smooth, large, concave-convex, rounded on coxa 1 and ovoidal on coxae 3-6.
Oostegites (Fig. 2C and D) on coxa 2 and 3 margins lined with long setae, as long as article 2 of gnathopod 2 and pereopod 3.