Namanereis llanetensis, Núñez 1 & Glasby 2 & Naranjo 3, 2020
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publication ID |
https://dx.doi.org/10.3897/subtbiol.36.55090 |
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publication LSID |
lsid:zoobank.org:pub:E876880C-8084-4882-BA3B-1AF7396FB4F2 |
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persistent identifier |
https://treatment.plazi.org/id/99E2991B-A2E2-4587-BF83-3CAFDA747571 |
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taxon LSID |
lsid:zoobank.org:act:99E2991B-A2E2-4587-BF83-3CAFDA747571 |
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treatment provided by |
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scientific name |
Namanereis llanetensis |
| status |
sp. nov. |
Namanereis llanetensis sp. nov. Figs 1a, c View Figure 1 , 3 View Figure 3 , 4e, f View Figure 4
Namanereis sp. nov. 2 Glasby, Fiege & Van Damme, 2014: 28 (Table 1).
Type locality.
Canary Islands, Gran Canaria, Los Llanetes water mine (Valsequillo) (27°59'12.63"N, 15°28'52.03"W) 415 m above sea level.
Type material.
Holotype: TFMCBM-AN/243, coll. M. Naranjo, 8-6-2010. Paratypes: TFMCBM-AN/244, 1 spec., coll. M. Naranjo, 28-7-2010; TFMCBM-AN/245, 1 spec., coll. M. Naranjo, 12-8-2010; Los Llanetes water mine (Valsequillo, Gran Canaria), 1 spec., coll. M. Naranjo, 28-7-2010; 1 spec., coll. C. González, 12-8-2010.
Description.
Holotype with 86 chaetigers, 34 mm long and 1.3 mm wide excluding parapodia and chaetae. Paratypes with 83-88 chaetigers, 28-35 mm long and 0.8-1.0 mm wide; one paratype female with gametes in coelom (Fig. 1c View Figure 1 ).
Living individuals with depigmented epidermis, highlighting the red dorsal blood vessel over the fleshy pink coloured body. Body uniform in width in anterior and middle region, tapering abruptly only in far posterior region; trunk convex dorsally and flattened ventrally (Fig. 1c View Figure 1 ).
Prostomium hexagonal, two times wider than long, without a cleft but with a shallow dorsal hollow; two conical frontal antennae, smooth, extending beyond the tip of palpostyle; palps broad and globose, biarticulated, with globular palpostyles; eyes absent (Fig. 3a View Figure 3 ). Tentacular segment as wide as first chaetiger, but slightly shorter in length. Three pairs of short tentacular cirri with indistinct cirrophores, and smooth tapering cirrostyles, the longest posterodorsal pair extending posteriorly to chaetiger 1-2 (Fig. 3a View Figure 3 ). Pharynx without paragnaths or papillae, but with a pair of brown, delta-shaped jaws, bearing bifid terminal teeth (Fig. 3b, c View Figure 3 ).
Parapodia with notopodial branch reduced to the inner acicula; neuropodium well-developed, acicular neuropodial ligule subconical (Fig. 3e, f View Figure 3 ). Dorsal cirri similar in length throughout the trunk, not surpassing the parapodial lobe; ventral cirri short, only about half as dorsal cirri in length (Fig. 3e, f View Figure 3 ). Notochaetae absent, neurochaetae as in Type A ( Glasby 1999), with slight arrangement modifications; 7 chaetae in each parapodium. Supraneuroacicular chaetae normally include 2 sesquigomph spiniger chaetae in postacicular fascicles (Fig. 3k, n View Figure 3 ) and 1 heterogomph falciger chaeta in preacicular fascicles (Fig. 3g, i View Figure 3 ), less frequently 1 sesquigomph spiniger chaeta and exceptionally up to 3 and no heterogomph falciger chaetae ; subneuroacicular chaetae normally include 2 heterogomph spiniger chaetae in postacicular fascicles (Fig. 3l, m View Figure 3 ) with long basal spinulation (Fig. 4e View Figure 4 ), and 2-3 heterogomph falciger chaetae in preacicular fascicles (Figs 3h, j View Figure 3 , 4f View Figure 4 ), less frequently 1 heterogomph spiniger chaeta or none; exceptionally in anterior parapodia 4 heterogomph falciger and no spiniger chaetae; 1 heterogomph pseudospiniger chaeta and 3 heterogomph falciger chaetae were observed on a single anterior parapodium. No blade length gradation was observed in heterogomph falciger chaetae. Supraneuroacicular falciger chaetae in chaetiger 10 with blades 3.8 × longer than width of shaft head (3.6-4.0), with 18 finely serrated teeth (15-22), length of the teeth decreasing towards the apex. Subneuroacicular falciger chaetae in chaetiger 10 with blades 4.3 × longer than width of shaft head (4.1-4.5), and 16 (15-20), length of the teeth decreasing towards the apex. Supraneuroacicular sesquigomph spiniger chaetae in chaetiger 10 with boss (vertical length of blade joint opposite collar) about 3.0 times length of collar. Aciculae dark honey coloured. Pygidium with terminal anus and two short ventrolateral anal cirri, slender and smooth (Fig. 3d View Figure 3 ).
Remarks.
Namanereis llanetensis sp. nov. also belongs to the so-called bifid-jaw group of groundwater Namanereis , bearing only a single pair of terminal teeth in the jaws ( Glasby et al. 2014). Namanereis llanetensis can be distinguished from all the above described species except N. serratis by the absence of long-bladed falcigers (= pseudospiniger chaetae) in the subacicular neuropodia; although, as reported above it can exceptionally occur in some anterior parapodia. The new species can be distinguished from N. serratis due to the greater number of teeth (and finer teeth) on the blades of the supraneuroacicular falcigers (only 6-11 coarse teeth in N. serratis ).
Habitat. - Type material from a freshwater mine extending into an aquifer at 415 metres above sea level, located on the eastern sector of the island of Gran Canaria. Individuals were collected in the flooded sections of the mine, with abundant plant roots, were the stygobiont amphipod Pseudoniphargus pedunculatus was also found ( Naranjo et al. 2014).
Distribution.
Type locality: Canary Islands, Gran Canaria, Valsequillo, Los Llanetes water mine.
Etymology.
The species is name after the type locality "Llanetes water mine".
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.
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Namanereis llanetensis
| Nunez 1, Jorge, Glasby 2, Christopher J. & Naranjo 3, Manuel 2020 |
Namanereis
| Chamberlin 1919 |