Lumbrineridae sp. NHM_1485, 1930

Neal, Lenka, Abrahams, Emily, Wiklund, Helena, Rabone, Muriel, Bribiesca-Contreras, Guadalupe, Stewart, Eva C. D., Dahlgren, Thomas G. & Glover, Adrian G., 2023, Taxonomy, phylogeny, and biodiversity of Lumbrineridae (Annelida, Polychaeta) from the Central Pacific Clarion-Clipperton Zone, ZooKeys 1172, pp. 61-100 : 61

publication ID

https://dx.doi.org/10.3897/zookeys.1172.100483

publication LSID

lsid:zoobank.org:pub:6BAEC3DE-E4B3-477B-948D-DC1E0ACA631B

persistent identifier

https://treatment.plazi.org/id/15D9C81C-86E5-5C7B-8C58-725F569430EC

treatment provided by

ZooKeys by Pensoft

scientific name

Lumbrineridae sp. NHM_1485
status

 

Lumbrineridae sp. NHM_1485 View in CoL View at ENA

Figs 4A-E View Figure 4 , 5A-F View Figure 5

Material examined.

NHM_1485, NHM ANEA 2022.852, coll. 4 Mar. 2015, AB02, UK-1, Box core, 12.495, -116.65018, 4260 m, https://data.nhm.ac.uk/object/f44e9778-31b9-4204-8b41-f2229302bfd3; NHM_1516, NHM ANEA 2022.853, coll. 5 Mar. 2015, AB02, UK-1, EBS, 12.51317, -116.49133, 4252 m, https://data.nhm.ac.uk/object/18dad4b1-fb07-49ef-a56a-168ced070d7f; NHM_1843, NHM ANEA 2022.854, coll. 13 Mar. 2015, AB02, OMS, Megacore, 12.05465, -117.25158, 4096 m, https://data.nhm.ac.uk/object/8250bf25-7734-4db0-b18c-6ad49e5cc9f6.

Description.

Species represented by several posteriorly incomplete specimens. Voucher specimen NHM_1485, 7.5 mm long and 1 mm wide for 29 chaetigers long anterior fragment. Voucher specimen NHM_1516 (Fig. 4A View Figure 4 ) dissolved for jaws examination and now represented by jaws only (Fig. 4B View Figure 4 ). Molecular voucher NHM_1843 is a body fragment, identified by DNA only. Live specimen light pink colour (Fig. 4A View Figure 4 ), with iridescent sheen and faint spotted pattern across body and prostomium; a red/orange band can be seen along dorsum. Preserved specimens pale yellow in ethanol. The anterior end of the body thick, with a distinctive large collar.

Prostomium elongated, conical, and distally pointed, longer than wide (Fig. 4A View Figure 4 ).

Maxillary apparatus with four pairs of maxillae (Fig. 4B View Figure 4 ). All maxillae with attachment lamellae. MI forceps-like without internal accessory teeth. MI the same length as carriers and joined completely to the base. MII with ~ 3-5 distinctive teeth, and thin sclerotised ligaments on the posterior end, ~ 2/3 the length of MI. MIII completely pigmented. MIV approximately rectangular and unidentate. Mandibles fused for only ¼ of their length.

Parapodia consistent across body length, short and rounded. Pre-chaetal lobes broad and low in all chaetigers (Figs 4C View Figure 4 , 5A View Figure 5 ). Branchiae present, simple, unbranched, elongated and digitiform (Fig. 4C View Figure 4 ), best developed in anterior chaetigers (Fig. 4C, D View Figure 4 ), at some point becoming absent (Fig. 5A View Figure 5 ).

Chaetae characterised by narrowly limbate capillaries (Figs 4E View Figure 4 , 5A-C View Figure 5 ) and simple hooded hooks (Fig. 5A, D, E View Figure 5 ). Anterior fragment, specimen NHM_1485 with narrowly limbate capillaries only in 29 chaetigers long fragment. Chaetae increase in number from chaetigers 1-8, then decrease again from chaetiger nine onwards. From chaetiger 21, there are ~ 3 chaetae. Body fragment NHM_1483 with 1-3 narrowly limbate capillaries and one or two simple hooded hooks. Hooks long and slender, multidentate, with fine dentition of ~ 5 small teeth (Fig. 5D, E View Figure 5 ). Aciculae black (Fig. 4C, E View Figure 4 ), tips protruding (Fig. 5F View Figure 5 ). Posterior end and pygidium unknown.

Genetic data.

In our analysis, this species falls as a sister taxon to clade containing Augeneria species and unidentifiable CCZ specimen assigned to Lumbrineridae sp. NHM_2146 (Fig. 3 View Figure 3 ). It has one COI match on GenBank with another unclassified annelid specimen, GenBank accession number KJ736520.1, also collected at the CCZ ( Janssen et al. 2015).

Remarks.

We were not able to confidently identify CCZ specimens to the genus-level, as they were represented by two short anterior fragments (one now dissolved for jaws) and body fragment, identified by DNA only. No hooded hooks were observed in 29-chaetiger long anterior fragment of CCZ specimen NHM_1485, but they were present in all chaetigers on the body fragment of specimen NHM_1843, which was identified by DNA. Morphologically, elements of the maxillary apparatus (four pairs of dark maxillae, all with attachment lamellae, MII with ligaments) and chaetae composition (limbate chaetae and simple multidentate hooded hooks) are characteristic of several lumbrinerid genera. The digitiform structure associated with parapodia has been interpreted as branchia, pointing to the genus Cenogenus Chamberlin, 1919 (Oug pers. comms.). Due to the uncertainty of some characters such as hooks observed from the body fragment only (Fig. 5D-E View Figure 5 ), we identify this CCZ species to family level only and ascribe it to morphospecies Lumbrineridae sp. NHM_1485.

Distribution.

Central Pacific Ocean, Eastern CCZ, found in ‘UK-1’ and ‘OMS’ exploratory areas (Fig. 1 View Figure 1 ).

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Eunicida

Family

Lumbrineridae