Ostracoda (Myodocopa) from Anchialine Caves and Ocean Blue Holes Author Kornicker, Louis S. Author Iliffe, Thomas M. Author Harrison-Nelson, Elizabeth text Zootaxa 2007 2007-08-31 1565 1 1 151 https://biotaxa.org/Zootaxa/article/view/zootaxa.1565.1.1 journal article 10.11646/zootaxa.1565.1.1 1175­5334 5095810 A2CDD9CB-CA5E-418B-A471-9EEFDC5CCF16 Pseudophilomedes ferulanus Kornicker 1958 Figs. 46 , 47 Pseudophilomedes ferulana Kornicker 1958: 235 , figs. 46: 1a,b, 2a,b: 56A–D. Pseudophilomedes ferulanus .—Kornicker 1989: 8. Pseudophilomedes ferulana .— Darby 1965: 64–70 , Fig. 10 , pls. 11,12. Not Pseudophilomedes ferulanus .— Kornicker 1967: 8 , figs. 1–6, pl. 1.—1969: 119, figs. 3, 4, pl. 11.—1977: 792.— 1984: 33, figs. 14–16. Holotype . USNM 113287 , adult female on slides. Type locality. Bimini , Bahamas , Great Bahama Bank. Material. Great Bahama Bank , Exuma Cays , Great Exuma , Stocking Island (Bottomly’s Blue Hole), Sta 99-065: USNM 10214561 , 1 specimen on slide and in alcohol . Distribution. See Kornicker (1984: 33) . Herein, Great Bahama Bank, Stocking Island (Bottomly’s Blue Hole). Description of instar II (sex unknown) ( Figs. 46 , 47 ). Carapace elongate with projecting caudal process ( Fig. 46 a,c,e ); incisure forming obtuse-angle ( Fig. 46 a,b,d ). Ornamentation ( Fig. 46 b–e ): Surface with widely distributed long and medium length bristles; long bristles with broad triangular basal part. Outer edge of rostrum with small nodes ( Fig. 46 b,d ). Ribs, punctations, and reticulations absent on USNM 1021461. Infold: Rostral infold broad with 4 long bristles forming row, and 1 minute bristle near ventral end of rostrum ( Fig. 46 d ). Infold of caudal process broad, with 2 indistinct bristles ( Fig. 46 e ). Narrow infold along anteroventral, ventral and posterior margins of valve. Anteroventral infold without bristles or parallel striations. FIGURE 46. Pseudophilomedes ferulanus Kornicker 1958 , USNM 1021461, instar II, sex unknown: a, complete specimen from right side, length 0.69 mm; b, anterior of left valve, ov; c, posterior of left valve; ov; d, anterior left valve, iv; e, posterior left valve, iv; f, left first antenna drawn on body, lv; g, right second antenna, mv; h, left mandible, maxilla, and fifth limb drawn on body, lv; i, right mandible, mv; j, right maxilla, lv; k, left lamella of furca, lv; l, left lateral eye, protopod left second antenna, Bellonci Organ; m, Bellonci Organ and medial eye; n, posterior of body showing left Ysclerite, ventral end of girdle, and dorsal end of furca. Scale equals 0.05 mm ( b–n ). FIGURE 47. Pseudophilomedes ferulanus Kornicker 1958 , USNM 1021461, instar II, sex unknown: a, left fifth limb, av; b–e, right fifth limb, pv; f, left sixth limb, lv; g, posterior of body showing Y-sclerite, girdle, and posterior end of furca. Scale equals 0.05 mm ( a,f,g) and 0.02 mm ( b–e ). Selvage: Narrow fringed lamellar prolongation along anterior and ventral margins of valve. Prolongation not divided at incisure. Central adductor muscle attachments: Indistinct on USNM 10214561. Carapace size (length, height in mm): USNM 10214561, 0.69, 0.41. First antenna ( Fig. 46 f ): Segment 2 with 1 dorsal bristle. Segment 3 with 2 bristles (1 ventral, 1 dorsal). Segment 4 with 1 dorsal bristle. Long ventral bristle of segment 5 with small proximal filament. Segment 6 with small medial bristle near dorsal margin. Segment 7 with 3 bristles: a-bristle about 3 times length of bristle of 6th segment; b-bristle about twice length of a-bristle; c-bristle long, bare. Segment 8 with 4 long bare bristles. Second antenna ( Fig. 46 g ,l ): Protopodite bare; proximal connecting sclerite fairly linear. Endopod with 2 segments, each with 1 bristle. Exopod: Right limb of USNM 10214561 aberrant in having only 7 segments ( Fig. 46 g ); left limb with 9 segments; terminal segment of left limb with 2 bristle, of right limb with 3 bristles. Most bristles with natatory hairs, some also with slender proximal ventral spines; 1st segment with minute terminal medial spine-like bristle; some segments with distal spines forming row. Mandible ( Fig. 46 h,i ): Coxa endite bifurcate, spinous. Basis: dorsal margin with 1 distal and 2 terminal bristles; medial surface with 1 or 2 short bristles near ventral margin; ventral margin with 1 bristle near midlength. Exopod elongate with 2 terminal bristles. Endopod: 1st segment with 3 terminal ventral bristles; 2nd segment with 4 or 5 bristles on or near dorsal margin and 2 short distal bristles on ventral margin; 3rd segment with 3 slender bristles and 2 claw-like bristles. Maxilla ( Fig. 46 j ): Endite I with 2 terminal bristles and 2 terminal pectinate claws; endite II with 1 proximal bristle, 2 terminal bristles and 2 terminal claws; endite III with 1 long terminal bristle. Basis with 1 short dorsal terminal bristle and 1 long ventral terminal bristle. Exopod with 3 bristles (2 long, 1 short); base of exopod bristles on 1st endopod segment close to distal margin of basis. Endopod: 1st segment with distal dorsal bristle; 2nd segment with 3 short bristles and long terminal finger-like process with annulated narrower distal part. Fifth limb ( Fig. 47 a–e ): Epipod with 28 spinous bristles. Exopodite represented by 2 short bristles. Coxa with 2 endites: endite I with 2 short bristles; endite II with tooth with 3 prongs and 3 bristles. Basis with 2 endites: endite I anterior with tooth with 2 prongs (distal tooth with small marginal prong on inner edge); endite II posterior with 1 long posterior proximal bristle and long slender tooth; inner edge of tooth with 2 teeth (proxima1 with 3 prongs, distal single). Exopod represented by two bristles. Endopod: segment 1 represented by single bristle on posterior surface; segment 2 elongate with 4 bristles (1 short proximal, 3 terminal (stout terminal bristle with stout proximal marginal spines)). Sixth limb ( Fig. 47 f ): Bilobed with marginal spines and 1 long spinous bristle on smaller lobe. Seventh limb: Absent. Furca ( Fig. 46 k ): Each lamella with 5 claws decreasing in length and width posteriorly along lamella. A stout spine adjacent to base of posterior edge of claw 5; additional slender spines along lamella following claw 5. Anterior of right lamella with slender spines near base of claw 1. Claw 1 with stout medially tooth proximal to midlength. All claws with proximal teeth along posterior edge. Bellonci Organ ( Fig. 46 l,m ): Elongate with rounded tip bearing few spines, and sutures in proximal part. Eyes: Medial eye only weekly pigmented and small ( Fig. 46 m ). Lateral eye small, pigmented, and with 3 ommatidia ( Fig. 46 l ). Y-Sclerite ( Figs. 46 n , 47 g ): Branching distally. Discussion. The second instar of a species of Pseudophilomedes has not been described previously. The specimen from Bottomly’s Blue Hole provided the opportunity to describe instar II of P. ferulanus . The morphology of the first antenna and sixth limb of the species is consistent with members of the Myodocopina in that the fourth segment of the first antenna bears only a dorsal bristle, and the sixth limb bears only one bristle (see Hiruta 1983: 673 ). The bristle of the sixth limb of instar II of P. ferulanus is unusually long.