Pseudophilomedes ferulanus Kornicker 1958

Kornicker, Louis S., Iliffe, Thomas M. & Harrison-Nelson, Elizabeth, 2007, Ostracoda (Myodocopa) from Anchialine Caves and Ocean Blue Holes, Zootaxa 1565 (1), pp. 1-151 : 87-90

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.

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.

Figures

FIGURE 10. Danielopolina palmeri, new species, paratype, USNM 1021376, adult female, complete specimen from right side, length without processes 0.49 mm, with processes 0.61 mm.

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).