Hatschekia euanus, Lee & Lee & Boxshall, 2013
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publication ID |
https://doi.org/ 10.5252/z2013n3a3 |
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persistent identifier |
https://treatment.plazi.org/id/51692336-BA4A-FFD4-E190-6B9E407BA7EF |
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treatment provided by |
Felipe |
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scientific name |
Hatschekia euanus |
| status |
sp. nov. |
Hatschekia euanus n. sp.
Hatschekia sp. 12 – Justine et al. 2010b: fig. 1B.
TYPE HOST. — Gymnocranius euanus (Günther, 1879) ( Perciformes : Lethrinidae ).
TYPE LOCALITY. — New Caledonia.
ETYMOLOGY. — The specific name of the new species, euanus , is treated as a noun in apposition and is based on its host.
MATERIAL EXAMINED. — Holotype female (MNHN- IU-2013-4011) dissected on 9 slides. 3 ♀♀ undissected paratypes (1 ♀ for SEM) from G. euanus [JNC1788], external slope of barrier reef, off wreck of ship Ever Prosperity, New Caledonia, coll. J.-L. Justine, 26.IV.2006. 2 ♀♀ undissected in MABIK CR00179942 - CR00179943 . 2 ♀♀ paratypes from G. euanus [JNC1852], Récif Le Sournois , New Caledonia, coll. J.-L. Justine, 6.VI.2006. ( NHMUK 2012.1300 About NHMUK - 1301 About NHMUK );
1 ♀ paratype from G. euanus [JNC1855]; Récif Aboré, New Caledonia, coll. J.-L. Justine, 2.VII.2006. ( MABIK CR00179944 ) ;
2 ♀♀ paratypes from G. euanus ? [JNC1725 – identification not confirmed, see table 2 in Justine et al. 2010b], near Récif Toombo, New Caledonia, coll. J.-L. Justine, 19.I.2006. (MNHN-IU-2013-4012).
DESCRIPTION
Female
Total body length 750 – 870 Μm (n = 5, mean = 830 Μm) excluding caudal rami. Cephalothorax ( Fig.8A View FIG ) trapezoidal, wider than long (228 × 169 Μm) and widest near posterior margin,lateral margins very slightly concave, with slight processes at anterolateral angles and larger processes at postero-lateral angles; posterior margin evenly convex; dorsal surface with distinct chitinous markings in form of “m-shape”, bar in mid-line about to level of posterior tips of curved lateral bars; bars without side branches.Trunk ( Fig. 8A View FIG ) fusiform, longer than wide (612 × 235 Μm); with narrow anterior “neck” region, broadening out sharply to maximum width about at level of anteriorly-located third legs, narrowing gradually posteriorly; lacking posterolateral lobes or processes. Urosome ( Fig. 9E View FIG ) excluding caudal ramus shorter than wide (28 × 62 Μm), comprising fused genital complex and abdomen ( Fig. 9E View FIG ). Caudal ramus ( Fig. 9E View FIG ) elongate, with a transverse marking at level of lateral seta, longer than wide (28 × 15 Μm), with six naked setae, five distal, one lateral.
Rostrum concealed beneath frontal projections of dorsal cephalic shield, comprising two pairs of humplike processes ( Fig. 8B View FIG ), visible in ventral view ( Fig. 10B View FIG ). Antennule ( Fig. 8B View FIG ) 4-segmented; length 119 Μm; armature formula:11, 7, 1, 11 + ae. Antenna ( Fig. 8C View FIG ) 3-segmented; proximal segment unarmed; middle segment (basis) slightly tapering, ornamented with minute surface pits; terminal claw bearing one small spine proximally; total length 159 Μm; middle segment length 96 Μm; terminal claw length 63 Μm. Parabasal papilla small. Oral cone robust. Mandible ( Fig. 8D View FIG ) styliform, with simple pointed apex. Maxillule ( Fig. 8E View FIG ) bilobate; both lobes armed with two sharp tapering processes. Maxilla ( Fig. 8F View FIG ) 4-segmented; proximal segment unarmed; second segment swollen, with one proximal seta on medial margin; third segment rod-like, elongate, with one distal seta; terminal segment small, with one small seta and bifid claw. Maxilliped absent.
Leg 1 ( Fig. 9A View FIG ) biramous; protopod bearing one outer seta and inner spine; exopod 2-segmented, exp-1 with one outer seta, exp-2 with six setae; endopod 2-segmented, enp-1 unarmed, enp-2 with two inner and three distal setae; protopod length 50 Μm; exopod length 28 Μm; endopod length 25 Μm. Leg 2 ( Fig. 9B View FIG ) biramous; protopod bearing one small outer seta and, in one specimen, fine inner setule; exopod indistinctly 2-segmented, exp-1 one outer seta, exp-2 with two inner and three terminal setae; endopod 2-segmented, enp-1 with one inner seta, enp-2 with one inner and three terminal setae; protopod length 56 Μm; exopod length 33 Μm; endopod length 33 Μm. Protopods and rami of legs 1 and 2 ( Fig. 9A, B View FIG ) ornamented with crescentic rows of blunt spinules on surface; protopod of leg 2 with large inner setule in one specimen, absent in other examined specimens.Intercoxal sclerites of both legs elongate, unornamented and unmodified.Legs 3 and 4 ( Fig. 9C, D View FIG ) each represented by small lobe tipped with one simple seta located laterally at about one third and two thirds of length of trunk, respectively.
Male
Unknown.
REMARKS
The shape of the cephalothorax of Hatschekia euanus n. sp. is very distinctive: it has very slightly concave lateral margins, which diverge posteriorly and there are defined swellings (weak processes) at both the anterolateral and the posterolateral corners of the dorsal cephalothoracic shield. Posterolateral swellings are present on the cephalothorax of H. uncata Wilson, 1913 , but the lateral margins of this species are strongly convex and the shape of its trunk, which bears paired hemispherical protuberances on its posterior margin, is entirely different. Anteriorly H. uncata lacks the four-partite frontal process which is present on the antero-ventral margin of the cephalothorax of H. euanus n. sp. The form of this structure is unique within the genus.
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.