Rutiderma flex, Kornicker & Iliffe & Harrison-Nelson, 2007

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 : 91-95

publication ID	https://doi.org/ 10.11646/zootaxa.1565.1.1
publication LSID	lsid:zoobank.org:pub:A2CDD9CB-CA5E-418B-A471-9EEFDC5CCF16
DOI	https://doi.org/10.5281/zenodo.5095924
persistent identifier	https://treatment.plazi.org/id/2A5087FF-3E6C-FC53-3A91-FE71FAE56835
treatment provided by	Felipe
scientific name	Rutiderma flex
status	sp. nov.

Treatment

Rutiderma flex View in CoL , new species

Figs. 48–51 View FIGURE 48 View FIGURE 49 View FIGURE 50 View FIGURE 51

Etymology. An arbitrary combination of letters.

Holotype. USNM 1021462 About USNM , adult male on slide and in alcohol.

Type locality. Conch Sound Blue Hole, Andros Island, Great Bahama Bank.

Paratypes. None.

Distribution. Great Bahama Bank: Andros Island (Conch Sound Blue Hole).

Description of adult male ( Figs. 48–51 View FIGURE 48 View FIGURE 49 View FIGURE 50 View FIGURE 51 ). Carapace with short rostrum and caudal process ( Fig. 48 View FIGURE 48 ).

Ornamentation: Carapace with alate posterior process well defined only along dorsal and posterior edges ( Figs. 48 View FIGURE 48 , 49 b View FIGURE 49 ). Surface with small round separated fossae ( Figs. 48 View FIGURE 48 , 49c View FIGURE 49 ). Single bristles present along valve margins and widely scattered on lateral surface ( Figs. 48 View FIGURE 48 , 49 c View FIGURE 49 ). Anterior margin of rostrum with scalloped edge. Tip of caudal process with minute indentation ( Figs. 48 View FIGURE 48 , 49 b,d,f,g View FIGURE 49 ).

Infold: Infold of rostrum with 7 single bristles ( Fig. 49 c View FIGURE 49 ). Anteroventral infold with 10 single bristles forming row ( Fig. 49 e View FIGURE 49 ). Ventral infold anterior to caudal process with about 5 small single bristles forming row ( Fig. 49 d View FIGURE 49 ). Infold of caudal process of each valve somewhat obscured by debris, with pocket with anterior oblique shelf with straight posterior edge without bristles ( Fig. 49 d,f View FIGURE 49 ); ventral edge of shelf curves posteriorly and terminates in sclerotized process ( Fig. 49 d,f View FIGURE 49 ); posterior edge of shelf with transparent lamellar prolongation; dorsal part of lamellar prolongation of right valve with minute serrations ( Fig. 49 d View FIGURE 49 ); 3 or 4 small bristles present near posterior edge of caudal process ( Fig. 49 d,f View FIGURE 49 ). Lamellar prolongation may be divided at incisure, but obscured by debris.

Central adductor muscle attachments ( Figs. 48 View FIGURE 48 , 49 a,g View FIGURE 49 ): Consisting of about 19 ovoid attachments.

Carapace size (length, height in mm): USNM 1021462, 1.21, 0.73.

First antenna ( Figs. 49 g View FIGURE 49 , 50 a,l View FIGURE 50 ): 1st segment bare. 2nd segment with proximal dorsal spines, a few distal ventral spines, many faint lateral spines in distal dorsal corner, 1 dorsal bristle, and 1 distal lateral bristle. 3rd segment short, dorsal margin longer than ventral margin, with 3 bristles (1 ventral, 2 dorsal). 4th segment with 4 bristles (3 ventral, 1 dorsal). 5th segment small, inserted ventrally between 4th and 6th segments, with stout cylindrical proximal part and 1 stout terminal bristle and many slender terminal filaments (at least 25, only 4 shown). 6th segment with 1 distal dorsal bristle. 7th segment with short a-bristle, stout b-bristle with 2 filaments, and long c-bristle with about 10 filaments. 8th segment with bare filamentous d- and e-bristles, long fbristle with about 11 filaments, and stout g-bristle with 1 or 2 filaments. Both c- and f-bristles almost as long as carapace ( Fig. 49 g View FIGURE 49 ).

Second antenna: Protopod bare ( Fig. 50 b,c,l View FIGURE 50 ). Endopod with 3 segments ( Fig. 50 b,c View FIGURE 50 ): 1st segment short with 5 bristles (4 proximal, 1 distal); 2nd segment elongate with 2 separated bristles just distal to midlength; 3rd segment elongate and reflexed with 1 proximal and 2 terminal bristles. Exopod with 9 segments ( Fig. 50 d View FIGURE 50 ): 1st segment with 2 or 3 distal ventral spines ( Fig. 50 d View FIGURE 50 ) and minute terminal medial spine ( Fig. 50 d,e View FIGURE 50 ); 2nd segment short with bare ventral bristle almost reaching 5th segment; segments 3–8 with long ventral bristle with natatory hairs; 9th segment with 5 bristles (4 with natatory hairs (dorsal bristle one-half length of others), 1 medial near dorsal margin, minute, bare) ( Fig. 50d View FIGURE 50 ).

Mandible ( Figs. 48 View FIGURE 48 , 50 f View FIGURE 50 ): Coxa endite represented by 2 minute spines at midheight. Basis: medial surface with 4 proximal bristles (2 medium length, 2 minute) near ventral margin; dorsal margin with 3 bristles (1 near midlength, 2 distal longer). Exopodite: lateral near dorsal margin, elongate, about one-half length dorsal margin of 1st endopod segment, with terminal spines. Endopod: 1st segment short with 2 ventral bristles. 2nd segment elongate, with ventral and medial spines, 3 dorsal bristles, and 6 short distal bristles (2 a-bristles, 1 bbristle, 1 c-bristle, 2 d-bristles). 3rd segment with 5 bristles (3 short a-bristles, 1 longer b-bristle, and 1 very long claw-like c-bristle).

Maxilla ( Fig. 50 g View FIGURE 50 ): Limb reduced. Bristles somewhat obscured on limb examined under oil immersion lens. Coxa with plumose dorsal bristle. Basis with bristle near dorsal margin and 2 at midwidth. Endites I–III with total of about 11 bristles. Endopod 2nd segment with about 7 weakly developed bristles. Exopod not observed.

Fifth limb ( Fig. 50 h View FIGURE 50 ): Segmentation unclear. Endopod 2nd segment with 5 ringed bristles. Exopod with 2 distinct ringed bristles. Epipod with about 30 plumose bristles.

Sixth limb ( Fig. 50 i View FIGURE 50 ): Endite I with 2 bristles; endite II with 2 bristles; endite III with 3 bristles; endite IV with 3 bristles. End segment with 3 anterior bristles and 4 plumose posterior bristles along ventral edge; anterior bristles on small projection. 2 bristles in place of exopod. Posterior edge and medial surface of limb with hairs.

Seventh limb ( Fig. 50 j View FIGURE 50 ): Long, slender, with 3 or 4 proximal bristles (1 or 2 on each side), each with 2 bells, and 4 terminal bristles (2 on each side), each with 4 bells. Tip with opposing teeth, 2 on each side.

Furca ( Figs. 48 View FIGURE 48 , 51 b View FIGURE 51 ): Each lamella with 4 primary claws followed by 1 or 2 secondary claws; claw 1 with medial and lateral row of teeth (distal teeth smaller); following claws with spines along posterior edge; claws 1 and 2 with proximal medial spines forming row; claws 1–3 with slender distal spines along anterior edge; right lamella anterior to left by width of base of claw 1.

Bellonci Organ ( Fig. 50 k View FIGURE 50 ): Elongate with proximal suture, short wide part near midlength, and pointed tip.

Eyes: Medial eye with black pigment and without dorsal filaments ( Fig. 50 k View FIGURE 50 ). Lateral eye about twice size of medial eye, with numerous divided ommatidia surrounded by black pigment except along edges ( Figs. 48 View FIGURE 48 , 49 g View FIGURE 49 , 50 l View FIGURE 50 ).

Upper lip ( Fig. 51 e View FIGURE 51 ): Rounded bare.

Copulatory limb ( Figs. 48 View FIGURE 48 , 51 b–d View FIGURE 51 ): Comprising 2 elongate lobes; tip of each lobe with minute sclerotized process and 2 pairs of small bristles.

Posterior of body ( Fig. 51 a View FIGURE 51 ): Bare. Girdle with ventral end fitting into small socket in dorsal margin of posterior end of Y-sclerite.

Y-Sclerite ( Fig. 51 a,c View FIGURE 51 ): Branching distally; posterior end forming angle.

Comparisons. The carapace of the male R. flex differs from that of R. dinochelatum Kornicker 1958 ( Kornicker 1958: fig. 46: 7a,b) in that the upper lateral rib does not extend anteriorly to intersect the anterior edge of the rostrum, and the lower lateral rib does not extend anteriorly to midlength of the carapace. The structure of the posterior edge of the shelf in the anterior part of the pocket of the infold of the caudal process of R. flex differs from those of R. darbyi Kornicker 1983 ( Kornicker 1983: Fig. 23 b View FIGURE 23 ) and R. schroederi Kornicker & Iliffe 2000 ( Kornicker & Iliffe 2000: fig. 53 c,d (female)). The infold of the rostrum of R. flex bears a row of seven bristles compared to 12 on R. mortenseni Poulsen 1965 ( Poulsen 1965: fig. 11 b). The adult male of R. flex is larger than that of R. licinum Kornicker 1983 , the furca bears one or two instead of three secondary claws, and the basis of the mandible bears four instead of six bristles near the ventral margin.