NMR solution structures of KAP- 1 PHD finger-bromodomain Author Ivanov, Dmitry L. Author Scheltema, Amélie H. text Zootaxa 2008 2008-09-26 1885 1 60 http://dx.doi.org/10.13018/bmr11036 journal article 10.13018/bmr11036 1175­5334 5133706 Claviderma compactum n. sp. ( Figures 1C , 7 , 8 , 13A, B ; Table 5 ) Type material: Holotype USNM 1112622 . Paratypes : USNM ; TAMU ; ZMUM Le1–172 (type locality); Le1–173 (AII-60 239); Le1–174 (AII-60 239); Le1–175 (AII-60 240); Le1–176 (AII-60 262). Type locality: Argentine Basin , 36°12.7'S , 52°42.7'W , 2,041 m ( RV Atlantis II Cruise 60, station 264, 28.03.1971 ) . Material examined: Argentine Basin , 687 specimens ( Table 5 ) . Diagnosis: A small Claviderma species < 3 mm , shank short, fuzzy from long upright sclerites, <1/3 trunk length, appearing nearly same width as trunk, sclerites upright on an anteroventral bulge, dorsal and remaining ventral trunk sclerites adpressed, at 45º to longitudinal body axis; shank clearly demarcated from trunk but not from knob; fringing sclerites not in ring, scarcely extending beyond knob; knob with two lateral groups of long sclerites. Oral shield sclerites in 3 rows. Trunk sclerites straight, narrow, base long, tapered proximally, blade short, narrower than base, with straight tapered sides ending in sharp point. Etymology: L. compactus, -a, -um = compact. Description: External appearance ( Figs 1C , 7A–C ): General : Small, trunk smooth, sclerites raised on shank giving it fuzzy, wide appearance; holotype length 2.7 mm , anterium 0.1 mm , trunk 1.6 x 0.6 mm , shank 0.6 X 0.4 mm , knob 0.4 mm , posterium/trunk index 0.37; base of large jaws within hemocoele forming an anteroventral bulge raising sclerites upright ( Fig. 7A–C , arrows); trunk sclerites arranged from anteroventral to dorsoposterior, diverging from ventral midline rather far posteriorly but not converging dorsally. Oral shield 0.18 mm in height. Sclerites ( Figs 7D, G , 8 ): General : Blade very short above waist on anterodorsal trunk, lengthening gradually posteriorly to the shank, thickest medially on base of trunk sclerites, thick for size of sclerites. Oral shield ( Fig. 7D , 8A ): triangular with rounded, angular base, rounded distally, thickest proximally, 65 x 30 x> 3 µm ; of nearly equal size in the 3 rows, largest dorsally. Dorsal to oral shield ( Fig. 8B ): oval or with waist, 50 x 25 x 2 µm . Anterium ( Fig. 8C ): asymmetrical and deeply waisted, to 100 x 25 x 3 µm . Trunk beneath anteroventral bulge ( Fig. 8D ): 2 types , one with deep waist like anterium sclerites, the other ovoid with a short blade, to 110 x 30 x 5 µm , thickest medially on base. Ventral trunk posterior to bulge ( Fig. 8E, F ): like second type of sclerites beneath bulge, but larger and with longer blades,>200 x 40 x 7 µm , thickest medially or distally on base. Dorsal trunk sclerites from anterior to posterior ( Fig. 8G, H ): similar to ventral sclerites, width of base nearly the same throughout trunk, base and blade both increasing in length, with blade increasing from 1/7 to 1/4 total length, from 150 x 30 x 4 µm to 250 x 35 x 8 µm , thickest medially on base. Shank ( Fig. 8I ): 2 types , one type with shape like trunk sclerites but with longer blade up to 1/2 total length, to 280 x 30 x 8 µm , thickest on blade; the second type shorter with a wide quadrate base, base and blade of about equal length, to 220 x 60 x 7 µm , thickest medially on blade. Fringe ( Fig. 8J ): with quadrate base and blade about 3 times length of base, 360 x 50 x 10 µm , or needle-like, 340 x15 x 8 µm . Knob ( Fig. 8K ): short, straight, tapered or swollen proximally, to 210 x 20 x 4 µm , or very long and hair-like, to 500 x < 5 µm . FIGURE 7. Claviderma compactum n. sp. , Argentine Basin. A, G. Holotype (RV Atlantis II Cruise 60 station 264). B–F. Paratypes, type locality (C is juvenile). A, B, C. Entire; arrows indicate ventral bulge caused by expanded hemocoele around base of jaws. D. Oral shield sclerites in situ . E. Jaw. F. Radula tooth and central plate. G. Dorsal mid-trunk sclerites. Radula and jaws : 2 examined. Jaws 520 x 200 µm ( Fig. 7E ); radula teeth 140 µm long, serrated membrane about 90 µm long, medial; central plate symmetrical, curved, 30 x 10 µm ( Fig. 7F ). Distribution ( Fig. 25 , Table 5 ): Known from 5 stations in the Argentine Basin at just above to within the continental rise ( 993–3,343 m ) ( Table 5 ). Remarks: Cl. compactum is distinguished from other Claviderma species by: a wide and fuzzy short shank and small size; 3 rows of oral shield sclerites almost equal in size; short, and narrow sclerite blades with straight sides tapering to a narrow proximal end. The anatomy of the relationship between jaws and hemocoele is found in Scheltema (1981) .