Marphysa papuaensis, Lavesque & Daffe & Glasby & Hourdez & Hutchings, 2022
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publication ID |
https://dx.doi.org/10.3897/zookeys.1122.89990 |
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publication LSID |
lsid:zoobank.org:pub:0DF18698-843E-4F78-9360-58A46B2010F7 |
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persistent identifier |
https://treatment.plazi.org/id/991E2117-4921-4A7F-83B8-8F30EF6CA73C |
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taxon LSID |
lsid:zoobank.org:act:991E2117-4921-4A7F-83B8-8F30EF6CA73C |
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treatment provided by |
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scientific name |
Marphysa papuaensis |
| status |
sp. nov. |
Marphysa papuaensis sp. nov.
Figs 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7
Material examined.
Holotype: MNHN-IA-2015-1559, complete, South Pacific Ocean , Papua New Guinea, New Britain, CP4264, - 4.6°S, 152.4°E, depth 430-523 m, April 2014 GoogleMaps . Paratypes: MNHN-IA-2015-1415, complete, South Pacific Ocean , Papua New Guinea, New Britain, CP4337, - 6.083°S, 149.316°E, depth 287-447 m, May 2014 GoogleMaps ; MNHN-IA-2015-1593, anterior part only, South Pacific Ocean , Papua New Guinea, New Britain, CP4329, - 6.133°S, 149.166°E, depth 250-500 m, May 2014 GoogleMaps ; AM W.53770, complete (several parapodia mounted for SEM), South Pacific Ocean , Papua New Guinea, New Britain, CP4264, 4.6°S, 152.4°E, depth 430-523 m, April 2014 GoogleMaps ; AM W.53771, anterior part only, mounted for SEM, South Pacific Ocean , Papua New Guinea, New Britain, CP4334, - 6.116°S, 149.166°E, depth 430-620 m, May 2014 GoogleMaps ; AM W.53772, complete, gravid, South Pacific Ocean , Papua New Guinea, New Britain, CP4266, - 4.6166°S, 152.416°E, depth 575-616 m, April 2014 GoogleMaps .
Additional material.
MNHN-IA-2015-1610, anterior part only, gravid, South Pacific Ocean , Papua New Guinea, New Ireland, CP4260, - 2.9°S, 151.1°E, depth 350-847 m, April 2014 GoogleMaps ; MNHN-IA-2015-1949, anterior part only, South Pacific Ocean , Papua New Guinea, New Ireland, CP4434, - 2.25°S, 150.8°E, depth 1066-1200 m, August 2014 GoogleMaps ; MNHN-IA-2015-1615, anterior part only, few parapodia used for molecular analysis, South Pacific Ocean , Papua New Guinea, New Hanover, CP 4482, - 2.683°S, 150.116°E, depth 761-825 m, September 2014 GoogleMaps .
Description
(based on holotype, with variation in parentheses for paratypes). Specimens strongly iridescent (Fig. 5B View Figure 5 ), 88 (89) chaetigers, 45 mm (41-80) long, 3.6 mm (2.5-2.8) width at chaetiger 10, excluding parapodia. Body elongated and tapered gradually at posterior end, anteriorly not flattened (Fig. 5A View Figure 5 ).
Prostomium bilobed, with buccal lips separated by a ventral notch only (Fig. 5B View Figure 5 ). Two palps and three antennae slender and tapering, palpophores not visible, arranged in an arc on posterior margin of prostomium. Antennae more or less smooth, of equal length, slightly longer than palps and prostomium (same size) (Figs 5C View Figure 5 , 7A View Figure 7 ). Eyes absent. First peristomial ring ~ 1.8 × longer than second one dorsally (Figs 5C View Figure 5 , 7A View Figure 7 ).
Maxillary apparatus (Fig. 6D, E View Figure 6 ) partially everted in holotype or paratypes. Formula as follows: MF = 1+1, 5(6)+5(6), 7+0, 4(3)+10(11), 1+1. MI ~ 2.5 × longer than maxillary carrier, rectangular anteriorly, triangular posteriorly, with a pair of rounded wings situated at posterolateral margins. MI forceps-like, without attachment lamellae, sub-right-angle falcal arch. Closing system ~ 4-5 × shorter than MI. Ligament between MI and MII rectangular, dark. MII without attachment lamella, teeth triangular, distributed in less than half of plate length. Ligament between MII and MIII absent (or not sclerotized). MIII, single, longer than left MIV, curved, with equal-sized triangular teeth; short attachment lamella situated in the centre of posterior edge of maxilla, oval, dark. Left MIV short (half the size of right MIV) with wide, rounded base, two left teeth longer than right-most ones; attachment lamella dark, semi-circular. Right MIV long, with teeth triangular, decreasing in size posteriorly; attachment lamella wide, semi-circular, dark. MV, paired, longer than wide, with a long tooth pointed ventrally, and a rounded dorsal margin (Fig. 6D View Figure 6 ). Mandibles dark with golden tips, with fine concentric stripes visible dorsally and ventrally, same size as MI; cutting plates whitish, with distinct growth rings, with three dorsal teeth (Fig. 6E View Figure 6 ).
Notopodial cirri very long, slender and, tapering (Fig. 6A-C View Figure 6 ), 2-3 × longer than ventral cirri in all chaetigers. Pre-chaetal lobe inconspicuous. Post-chaetal lobe digitiform in the two or three first chaetigers, triangular with tapering tip from chaetiger 4, reducing in size from chaetiger 17, almost inconspicuous from chaetiger 28 (21) (Fig. 6A-C View Figure 6 ). Ventral cirri (Fig. 6A-C View Figure 6 ) bluntly conical, with slightly expanded bases and rounded tips from chaetigers 1-22, subconical and thinner thereafter. Branchiae pectinate (Figs 5C View Figure 5 , 6A View Figure 6 , 7A View Figure 7 ), starting from chaetiger 7 (7) and continuing for a limited number of segments, until chaetiger 16 (14); with 8-16 long filaments.
Aciculae black with paler blunt tips, 2-4 per parapodium along the body. Supra-acicular chaetae with limbate capillaries and pectinates; capillaries present from first chaetiger to near pygidium, numbering up to 20 in anterior chaetigers. Pectinate chaetae commencing from first few chaetigers to near end, one type identified as heterodont-narrow-slender (HNS; Fig. 7B, D, E View Figure 7 ), one outer tooth very long (Fig. 7E View Figure 7 ), having nine or ten short internal teeth, each tooth prolonged by a thin filament.
Subacicular chaetae with compound falcigers and subacicular hooks (Figs 6F, G View Figure 6 , 7B, C View Figure 7 ). Compound falcigers bidentate, with short blade and large teeth, commencing from first chaetiger to near pygidium, with more than 50 chaetae within a parapodium in anterior part, with ~ 10 chaetae in mid-body and ~ 3-5 in last chaetigers (Fig. 6F View Figure 6 ). Subacicular hooks black with pale yellow tip, commencing from anterior chaetiger 20 (24) to end, most of the body with one hook per parapodia, but some posterior chaetigers with two, subacicular hooks bidentate (Figs 6G View Figure 6 , 7B, C View Figure 7 ).
Pygidium round and crenulated, dorsally positioned, with two pairs of tapering pygidial cirri attached at ventral edge, dorsal pair 2 (3) × length of ventral pair (Fig. 5D View Figure 5 ).
Etymology.
This species name refers to the type locality and geographical distribution of this species.
Type locality.
Papua New Guinea, Solomon Sea, New Britain.
Distribution.
Papua New Guinea, Solomon Sea (New Britain) and Bismarck Sea (New Ireland).
Habitat.
Between 250 and 1200 m, mostly found inside sunken wood.
Remarks.
Within the Central Indo-Pacific Realm, a single species with only compound falcigers present and branchiae restricted in a short region (group C1) has been described: M. bernardi Rullier, 1972 (type locality in New Caledonia). However, this species differs from M. papuaensis sp. nov. by the presence of a prostomium that is not bilobed, of antennae that are articulated and the absence of eyes. In contrast, M. papuaensis sp. nov. has smooth antennae, no eyes and a bilobed prostomium. The branchiae of M. bernardi are present from chaetiger 3, instead of chaetiger 7 for M. papuaensis sp. nov. and apparently M. bernardi has no pectinate chaetae, while M. papuaensis sp. nov. has pectinates commencing from first few chaetigers to near end. Finally, M. bernardi was collected in a bay from 7-8 m depth while M. papuaensis sp. nov. occurs only in deep sea, at 1200 m depth.
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.