Myopiarolis novaecaledoniae Bruce 2009, comb. n.
Creators: name: Bruce, Niel
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Serolidae
Myopiarolis
Myopiarolis novaecaledoniae

description: <i>Myopiarolis novaecaledoniae</i> (Poore and Brandt, 1997), comb. n. Fig. 19 <i>Caecoserolis novaecaledoniae</i> Poore and Brandt, 1997: 161, figs 7–10 (part). <b>Material.</b> <i>Holotype, paratypes</i> and all original non-type specimens: all re-identified as <i>M. novaecaledoniae</i> except as discussed below; details in Poore and Brandt (1997). <i>New material</i>: 3 (14.6 mm), New Caledonia, 24°16´S, 167°38´E, 21 Nov 1996, 1128– 1150 m, HALIPRO 2, stn BT 75; ‘photo 1-13-14-15’, coll. RV <i>Tangaroa</i>, (MNHN Is.6011). <b>Description.</b> <i>Body</i> 1.2 as long as wide, widest at coxae 3, dorsal surfaces smooth. <i>Head</i> anterior submarginal ‘ridge’ entire; dorsally without tubercles, posterior margin with low rounded median tubercle. <i>Eyes</i> present. <i>Pereonites</i> dorsally without tubercles. <i>Coxae</i> 4 extending to mid-pleonite 2; coxae 5 extending posteriorly along 0.3 of pleotelson length; coxae 6 extending to between posterior of uropods and pleotelson posterior margin, and along 0.9 of pleotelson length. <i>Ventral coxal plates</i> 2–4 mesially flat, plates 2–4 mesially with anterior and posterior ridges. <i>Pleonites</i> extending posteriorly along 0.8 pleotelson lateral margin; pleonite 1 sternal plates 3with acute median point, sternal plate 1 with median ridge and 2 sub-median depressions. <i>Pleotelson</i> dorsal surface with weak median longitudinal carina, with paired sublateral carinae; pleotelson lateral margins convex, pleotelson posterior margin converging to rounded caudomedial point. <i>Antennule</i> flagellum 2.0 as long as peduncle articles 3 and 4, extending to pereonite 3. <i>Antennal</i> flagellum 1.2 as long as peduncle article 5, extending to posterior of pereonite 4. <i>Pereopod 2 propodus</i> 2.5 times as long as wide, inferior margin with indistinct heel, palm straight, inferolateral margin with 6 RS, inferomesial margin with 6 RS, inferior margin RS simple, acute, smooth; <i>dactylus</i> 0.6 as long as propodus. <i>Pereopod 7</i> similar to, but 0.8 as long as pereopod 6. <b>Size.</b> Males 14.6–16.9 mm, ovigerous females 18.5 mm. <b>Remarks.</b> <i>Myopiarolis novaecaledoniae</i> may be identified by the flat sternal coxae that have mesial ridges that do not form a clear mesial ‘X’, the lack of dorsal ornamentation, long coxae 6 that extend to near the pleotelson apex, the pleonites 2 and 3 extending along the pleon to close to the point of insertion of the uropods, and the number, arrangement and shape of the robust setae on the male pereopod 2 palm. The most similar species, also from New Caledonia, but apparently occupying a more shallow depth range, is <i>Myopiarolis systir</i> sp. n. Both species lack dorsal tubercles, and have long coxae 6, but <i>M. novaecaledoniae</i> can be distinguished from <i>M. systir</i> by lacking the prominent X-shaped ridges on the sternal coxae, and having the pleonites extend much further along the pleotelson. Th e numerous differences between these two species are discussed in detail under the remarks for <i>M. systir</i>. One immature paratype is here re-identified as <i>Myopiarolis</i> sp. (p. 48, Fig.24). Of the non-type material identified by Poore and Brandt (1997) one is an immature female of <i>M. systir</i>, and the specimens from off Norfolk Island are <i>Myopiarolis norfanz</i> sp. n. Examination of the type material revealed some discrepancies between the specimens and the description, here emended. Th ere are medial flanges on the mesial margin of pleopod 4 exopods, and lobes adjacent to sutures on pleopods 4 and 5; the pleotelson does have a longitudinal carina, but it is weak; pereonites 5–7 were figured as entire but are medially fused; there is a low rounded medial nodule on the posterior margin of the head; and the transverse ridge on the head is more anteriorly positioned. <b>Distribution.</b> New Caledonia, 1128–1410 m.
description: Published as part of <i>Bruce, Niel, 2009, New genera and species of the marine isopod family Serolidae (Crustacea, Sphaeromatidea) from the southwestern Pacific, pp. 17-76 in ZooKeys 18 (18)</i> on pages 56-58, DOI: 10.3897/zookeys.18.96, http://zenodo.org/record/576495
description: {"references": ["Poore GCB, Brandt A (1997) Crustacea Isopoda Serolidae: Acutiserolis cidaris and Caecoserolis novaecaledoniae, two new species from the Coral Sea. Resultats de Campagnes MU- SORSTOM, Volume 18. Memoires du Museum National d'Histoire Naturelle, Paris 176: 151 - 168."]}