Eusarsiella fax, Kornicker & Iliffe & Harrison-Nelson, 2007
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publication ID |
https://doi.org/ 10.11646/zootaxa.1565.1.1 |
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publication LSID |
lsid:zoobank.org:pub:A2CDD9CB-CA5E-418B-A471-9EEFDC5CCF16 |
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persistent identifier |
https://treatment.plazi.org/id/2A5087FF-3E4C-FC72-3A91-FA43FE0B68B4 |
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treatment provided by |
Felipe |
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scientific name |
Eusarsiella fax |
| status |
sp. nov. |
Eusarsiella fax View in CoL , new species
Figs. 69–72 View FIGURE 69 View FIGURE 70 View FIGURE 71 View FIGURE 72
Etymology. From the Latin fax (torch, firebrand).
Holotype. USNM 1021474 About USNM , A- 1 female on slide and in alcohol.
Type locality. Sta 00-025, Conch Sound Blue Hole, Andros Island, Great Bahama Bank.
Paratypes. USNM 1021475 About USNM , undissected A-1 instar (sex unknown) in alcohol . USNM 1021476 About USNM , undissected A-1 instar (sex unknown) in alcohol . USNM 1021477 About USNM , A- 1 male on slide and in alcohol .
Distribution. Type locality.
Description of A- 1 female ( Figs. 69–71 a,b View FIGURE 69 View FIGURE 70 View FIGURE 71 ). Carapace oval in lateral view with triangular pointed caudal process ( Figs. 69 View FIGURE 69 , 70 c View FIGURE 70 ). Surface with 2 lateral ribs with pebbly surface and several nodes bearing a long bristle but no short broad bristles ( Fig. 69 View FIGURE 69 ).
Ornamentation ( Figs. 69 View FIGURE 69 , 70 a–c View FIGURE 70 ): Very short spines covering caudal process and remainder of valves,
appearing pebble-like along valve edges and on ridges. Surface of holotype with fossae with irregular outline, some with inward-pointing minute spines along edges. Surface coated with gel-like substance.
Infold: Anterior infold with minute bristle at midheight. Infold of caudal process with 3 bristles ( Fig. 70 c View FIGURE 70 ). Two setal bristles present dorsal to caudal process.
Selvage: Lamellar prolongation with smooth outer edge along valve margins. Prolongation with serrated margin extends well past tip of caudal process.
Carapace size ( length, height in mm): Holotype, USNM 1021474 About USNM , length including caudal process 0.94, length without caudal process 0.83, height 0.72.
First antenna ( Fig. 70 d View FIGURE 70 ): 1st segment bare. 2nd segment with dorsal bristle and 2 spines. 3rd and 4th segments fused: segment 3 with 2 bristles (1 ventral, 1 dorsal); 4th segment with 2 or 3 bristles (1 (right limb) or 2 (left limb) ventral, 1 dorsal). 5th segment with long ventral bristle with minute filament near midlength (not shown). 6th segment with short medial bristle. 7th segment: a-bristle short, b-bristle about same length as abristle, c-bristle as long as bristle of 5th segment, with minute distal filament (not shown). 8th segment: d- and e-bristles slightly shorter than c-bristle, bare with blunt tips, f-bristle shorter than c- bristle, g-bristle about same length as c-bristle.
Second antenna: Protopod bare. Exopod: 1st segment with small recurved medial spine; segments 2–8 with long bristle with proximal spines and distal natatory hairs; 9th segment with 2 bristles (1 long with proximal spines and distal natatory hairs, 1 short bare). Endopod with 2 fused segments: 1st segment with 1 (right limb) or 2 (left limb) ringed dorsal bristles; segment 2 tapering distally, bare ( Fig. 70 e View FIGURE 70 ).
Mandible ( Fig. 70 f View FIGURE 70 ): Coxa endite consisting of short stout spine; ventral margin of coxa with short hairs. Basis: medial side near ventral margin with 4 short bristles; ventral margin with 2 minute bristles; dorsal margin with 2 small distal bristles. Exopod absent. Endopod: 1st segment with distal medial spines, row of minute medial spines along distal margin (row extends to stout spine on dorsal edge of segment), and stout ventral claw with proximal row of minute teeth along dorsal edge; minute medial spine-like bristle at base of stout claw. 2nd segment with minute dorsal bristle and stout ventral claw. 3rd segment with 2 minute bristles (1 ventral, 1 dorsal) and stout terminal claw.
Maxilla ( Fig. 70 g,h View FIGURE 70 ): Endite I with 6 bristles; endite II with 4 bristles; endite III with 6 bristles. Coxa with short dorsal bristle. Basis with single bristle near exopod. Exopod with 2 bristles. Endopod with 2 segments: segment 1 with alpha- and beta-bristles; segment 2 with 2 a-bristles, 1 c-bristle, and 5 pectinate end bristles.
Fifth limb ( Fig. 70 i View FIGURE 70 ): Coxa endite with 1 short bristle. Basis with 2 endites: endite I with 2 bristles; endite II with 3 bristles. Endopod with 2 fused segments: segment 1 with 3 bristles (1 short); segment 2 with 2 bristles. Exopod represented by short bristle. Limb hirsute. Epipod with about 34 plumose bristles.
Sixth limb ( Fig. 70 j View FIGURE 70 ): Single endite with 3 bristles (1 terminal and 2 shorter proximal). End segment with 11 bristles plus 2 posterior plumose bristles.
Seventh limb ( Fig. 71 a View FIGURE 71 ): Each limb with 6 tapered bristles (2 proximal with 3 or 4 bells; 4 terminal with 4 or 5 bells). Tip with small opposing teeth. Each limb with about 62 annulae plus a terminal segment.
Furca ( Fig. 71 b View FIGURE 71 ): Each lamella with 5 claws; claw 1 with stout teeth and smaller teeth between them; claws 2 to 4 with small teeth; claw 1 with long medial spines near base; claw 4 of left lamella with long thin spines along anterior edge. Anterior edge of right lamella with small spine proximal to claw; left lamella with few spines along ventral edge following claw 5. Right lamella anterior to left by width of claw 1 at base.
Bellonci Organ ( Fig. 70 k View FIGURE 70 ): Elongate with rounded tip.
Eyes: Lateral eye with 5 amber ommatidia; brown pigment between ommatidia ( Fig. 70 l View FIGURE 70 ). Medial eye larger than lateral eye, with brown pigment ( Fig. 70k View FIGURE 70 ).
Genitalia: None observed.
Y-Sclerite: With ventral branch ( Fig. 71 b View FIGURE 71 ).
Posterior of body: Evenly rounded.
Gut content: Unidentified fragments.
Eggs: Absent.
Description of A- 1 male ( Figs. 71 c–k View FIGURE 71 , 72 View FIGURE 72 ). Carapace similar in shape and ornamentation to that of A- 1 female ( Fig. 71 c,d View FIGURE 71 ). Surface with gel-like coating.
Infold: Anterior infold with minute bristle near midheight. Infold of caudal process with 3 small bare bristles plus paired bristles closer to inner margin of infold ( Fig. 71 e View FIGURE 71 ). Posterior infold with 2 setal bristles.
Selvage: Similar to that of A- 1 female.
Carapace size (length, height in mm): USNM 1021477, length including caudal process 0.86, length without caudal process 0.77, height 0.64.
First antenna: 1st segment bare. 2nd segment with bare dorsal bristle. 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 bristle with 3 minute filaments. 6th segment with short medial bristle. 7th segment: a-bristle short, b-bristle about same length as a-bristle, c-bristle about same length as bristle of 5th segment, with 3 minute filaments, d- and e-bristles slightly shorter than c-bristle, bare with blunt tips; f-bristle shorter than cbristle, with 2 minute filaments; g-bristle about same length as c-bristle, with 3 small filaments.
Second antenna: Protopodite bare. Exopodite similar to that of A- 1 female. Endopod with 2 (possibly 3) fused segments ( Fig. 71 f,g View FIGURE 71 ): 1st segment with 2 ringed anterior bristles; terminal segment small, tapered, with short terminal pointed process.
Mandible ( Fig. 71 h View FIGURE 71 ): Similar to that of A- 1 female.
Maxilla ( Fig. 71 i,j View FIGURE 71 ): Similar to that of A- 1 female.
Fifth limb ( Fig. 71 k View FIGURE 71 ): Epipod with about 32 plumose bristle. Coxa endite with 1 small bristle. Basis: endite I lobate with 2 bristles; endite II with 3 bristles. Endopod: 1st segment with 3 bristles; 2nd segment with 2 bristles. Exopod represented by 1 bristle.
Sixth limb ( Fig. 72 a View FIGURE 72 ): Single endite with 3 bristles (1 terminal, 2 smaller and proximal). End segment with 11 bristles followed by 2 posterior plumose bristles (marginal spines not shown).
Seventh limb ( Fig. 72 b View FIGURE 72 ): Each limb with 4 tapered terminal bristles with 3 or 4 bells. Tip smooth.
Furca (72 c): Similar to that of A- 1 female.
Bellonci Organ ( Fig. 72 d View FIGURE 72 ): Elongate with rounded tip.
Eyes ( Fig. 72 d View FIGURE 72 ): Lateral eye with 5 amber-colored ommatidia and brown pigment between ommatidia. Medial eye larger than lateral eye, with brown pigment.
Lips: Stippled in Fig. 71 h View FIGURE 71 ; also shown in Fig. 72 e View FIGURE 72 .
Posterior of body ( Fig. 72 c View FIGURE 72 ): Evenly rounded and bare ventral to girdle.
Genitalia ( Fig. 72 f View FIGURE 72 ): A single tapered lobe on each side of body; 3 minute bristles near tip of each lobe.
Y-Sclerite ( Fig. 72 c View FIGURE 72 ): With ventral branch.
Gut content: Unidentified crustacean fragments.
Description of A-1 instar (sex unknown) ( Fig. 71 l View FIGURE 71 ). Carapace similar in shape and ornamentation to those of A- 1 female and male.
Carapace size (length, height in mm): USNM 1021475, length including caudal process 0.99, length without caudal process 0.85, height 0.73; USNM 1021476, length including caudal process 0.93, length without caudal process 0.81, height 0.68.
Central adductor muscle attachments: USNM 1021476 with about 16 ovoid attachments ( Fig. 71 l View FIGURE 71 ).
Comparisons
The irregular outlines of fossae on the carapace of E. fax are unusual; the fossae of previously described species having fossae are evenly rounded. The carapace of the new species resembles that of Eusarsiella cornuta Poulsen 1965 , which is known only from an adult female collected in the Virgin Islands ( Poulsen 1965:106). The edges of the fossae on the carapace of that species are crenulate, but the fossae are more rounded than those of E. fax .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.