Eusarsiella capillaris ( 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 : 96-97

Eusarsiella capillaris ( Kornicker 1958)

Fig. 52

Sarsiella capillaris Kornicker 1958: 248 , figs. 47: 7a, b; 76A, F, H; 89A, B, D, F, O.

Eusarsiella capillaris ( Kornicker 1958) .— Poulsen 1965: 83.— Kornicker 1986: 54, figs. 26–28a–c; pl. 1.

Holotype. USNM 122910 , specimen 92-1, whole dry specimen on slide, probably late instar, length 1.15 mm.

Type locality. Bimini, Bahamas.

Material. USNM 193115 , 1 adult female with body removed from carapace; all in alcohol and from continental shelf southwest of Florida .

Distribution. Bimini, Great Bahama Bank and southwest Florida continental shelf. Known depth range intertidal to 22.5 m.

Discussion. No specimens of E. capillaris are present in the collections from the Bahamas reported upon herein. However, for comparative purposes an adult female from the continental shelf southwest of Florida that had been reported and partly described by Kornicker (1986: 58) was reexamined in order to compare it with other species in the present collection, and a supplementary description of an adult female is presented herein. Appendages were studied while attached to the body and not all details were visible.

Supplementary description of adult female ( Fig. 52 ). Carapace oval in lateral view with projecting tapered caudal process and numerous spinous processes, most with 1 or 2 fairly long bristles with broad base and short broad tapered bristles with rounded tips: ventral and anterior margins with ten processes; posterodorsal margin with 4 processes; location of additional processes shown in Fig. 52 a . Surface of valves including processes covered by gel-like substance, not shown in illustration.

Ornamentation ( Fig. 52 a ): Surface with shallow oval fossae, scattered short, recurved, broad spine-like bristles, and scattered small slender spine-like bristles; lateral ridges absent. Edge of valves with long bristles broad proximally and narrow distally, and short spine-like bristles.

Central adductor muscle attachments ( Fig. 52 a ): Comprising about 13 ovoid scars (only 7 shown).

Carapace size USNM 193115: Kornicker(1986: 58) gave length as 1.28 mm, and height as 0.93 mm. Measurements herein of carapace with body removed (carapace had been preserved in alcohol for about 35 years): length 1.15 mm, height 0.85 mm for right valve, and 1.19 mm for length of left valve.

First antenna ( Fig. 52 b ): 1st and 2nd segments without bristles. 3rd and 4th segments fused; 3rd segment with 2 bristles (1 ventral, 1 dorsal); 4th segment with 3 bristles (2 ventral, 1 dorsal). 5th segment with long ventral terminal bristle. 6th segment fused to 5th, with small medial bristle near ventral margin. 7th segment: a-bristle about twice length of bristle of 6th segment; b-bristle medial, longer than a-bristle; c-bristle about same length as bristle of 5th segment. 8th segment: d- and e-bristles shorter than c-bristle, bare, filament-like; f-bristle stout, about two-thirds length of c-bristle; g-bristle shorter than c-bristle and longer than f-bristle.

Second antenna: Endopodite with 3 bristles (2 proximal, 1 terminal) ( Fig. 52 c ). 9th exopod segment with 2 bristles (dorsal small, ventral long).

Mandible ( Fig. 52 d ): Similar to that described for instar IV by Kornicker (1986: 57).

Seventh limb ( Fig. 52 e ): With 2 proximal bristle with 3 or 4 bells, and 6 terminal bristles (2 short with 2 or 3 bells, 2 medium length with 4 or 5 bells, 2 long with 5 or 6 bells). Tip of limb with opposing curved teeth, 2 or 3 on each side.

Furca ( Fig. 52 f ): Right lamella anterior to left by width of base of claw 1. Lamellae following claws without stout spines (two minute spines observed on left lamella). Stout marginal teeth on claws 1 and 2 as shown.

Lateral Eye ( Fig. 52 g ): With 5 ommatidia.

Eggs: Several large unextruded eggs present.

Comparisons. The first antenna of this species is unusual in lacking a dorsal bristle on the second segment of the first antenna ( Fig. 52 b ). Bristles on processes of the carapace of E. capillaris differ from those of Eusarsiella paniculata Kornicker 1986 in being broader and having blunter tips ( Kornicker 1986:61).

Remarks. The above description provides details omitted from prior descriptions of the species.

Figures

FIGURE 52. Eusarsiella capillaris (Kornicker 1958), USNM 193115, adult female: a, complete specimen from right side; b, left first antenna drawn on body, lv; c, endopod left second antenna drawn on body, mv; d, left mandible drawn on body, lv; e, left seventh limb, mv; f, left lamella of furca drawn on body, lv; g, right lateral eye drawn on body. Scale equals 0.20 mm (a) and 0.10 mm (b–g).