Nereis lucipeta Ehlers, 1908

Salazar-Vallejo, Sergio I., León-González, Jesús Angel De & Conde-Vela, Víctor M., 2021, Revision of the species confused with “ Nereis falsa ” de Quatrefages, 1866 (Annelida, Nereididae), European Journal of Taxonomy 779, pp. 1-70 : 43-46

publication ID

https://doi.org/ 10.5852/ejt.2021.779.1579

publication LSID

lsid:zoobank.org:pub:A60F479C-8055-4AC9-8F49-44311CA6EA0B

DOI

https://doi.org/10.5281/zenodo.5727412

persistent identifier

https://treatment.plazi.org/id/03EF3A1F-8A26-4C16-FE3B-2AF182A0721F

treatment provided by

Felipe

scientific name

Nereis lucipeta Ehlers, 1908
status

 

Nereis lucipeta Ehlers, 1908 View in CoL reinstated

Fig. 16 View Fig

Nereis lucipeta Ehlers, 1908: 69–71 View in CoL , pl. 8 figs 7–13.

Nereis splendida View in CoL – Ehlers 1913: 496 (non Grube, 1840).

Nereis falsa View in CoL – Fauvel 1919: 398 (non de Quatrefages, 1866).

Nereis lucipeta View in CoL – Hartman 1959: 262 (synonymy).

Nereis (Nereis) falsa View in CoL – Day 1967: 317, fig. 14.7k–o (non de Quatrefages, 1866).

Diagnosis

Nereis with posterior eyes completely exposed; tentacular belt 2× as long as first chaetiger; tentacular cirri short, reaching chaetiger 3; jaws with 7 denticles; pharyngeal area II with 18–20 paragnaths in crescent-shaped group, areas VII–VIII with 30–46 paragnaths in 2–3 transverse rows; anterior chaetigers with notopodial ligules short, globose; ventral ligules in median and posterior chaetigers markedly longer than neuracicular ligules.

Material examined

Syntypes ANGOLA • many syntypes (fide Hartwich 1993: 114); Big-Fish Bay ; ZMB Verm. 4440 2 syntypes; same collection data as for preceding; ZMF 1660 2 syntypes; University of Marburg (fide Fiege & Wehe 2004). Not seen .

Other material

MADAGASCAR • 4 specs; “Tuléar” [Toliara]; stn 52; 1906; Mission F. Geay leg.; MNHN 83-52 .

Description (MNHN 83-52)

BODY. Atoke specimens; two complete, and two anterior fragments; complete specimens 18–29 mm long, 0.9–1.4 mm wide, with 64–72 chaetigers; anterior fragments 6–18 mm long, 1.2–2.0 mm wide, with 18–30 chaetigers (largest one broken in two pieces). Body pale, subcylindrical, depressed along posterior region.

PROSTOMIUM. Slightly longer than wide, dorsal groove present ( Fig. 16A–D View Fig ). Eyes blackish, of similar size, anterior eyes oval, directed anteroventrally, diameter about ⅙–⅐ of prostomial width, slightly more separated than posterior eyes ( Fig. 16A–D View Fig ). Antennae half as long as prostomium, without gap between them, tips surpassing palpophore tips, sometimes reaching palpostyle tips ( Fig. 4C View Fig ). Palpophores subconical, 2× as long as wide; palpostyles projected, blunt, slightly longer than wide ( Fig. 16A–D View Fig ).

TENTACULAR BELT. 2 × as long as first chaetiger, anterior margin projected anteriorly middorsally, not covering posterior eyes or nuchal organs. Tentacular cirri smooth, barely contracted distally; smallest complete specimen with longest tentacular cirri reaching chaetiger 3 ( Fig. 16A View Fig ), in largest complete specimen reaching chaetiger 3.

PHARYNX. Not everted, observed by previous dissection of largest specimen. Jaws brown, with 7 denticles. Paragnath formula: I: 2 in tandem; II: 18–20 in crescent-shaped group; III: 30 in oval group; IV: 28–30 in oval groups; V: 0; VI: 4 in diamond; VII–VIII: 30-46 paragnaths in 2–3 rows (size dependent).

PATTERN OF PARAPODIAL LIGULES. Anterior chaetigers with ligules blunt, slightly longer than wide, becoming blunt subconical to digitiform in median and posterior chaetigers; ventral ligules thinner, 3–4 × as long as wide.

CHAETIGERS 1–2. With neuraciculae only ( Fig. 16E View Fig ); with both noto- and neuraciculae thereafter. Dorsal cirrus slightly longer and wider than ventral one, 2 × as long as parapodial ligules. Dorsal ligule longer than wide, blunt, as long as tapered median one. Neuracicular ligule subconical, blunt, as long as wide. Supracicular neurochaetae: barely exposed, 5 homogomph spinigers and 3 heterogomph falcigers with blades spinulose, 5–6× as long as wide, distal tooth incurved, tendons not visible; subacicular neurochaetae: 5 heterogomph spinigers and 6 heterogomph falcigers with blades spinulose, 6–7× as long as wide, distal tooth incurved, tendons not visible.

MEDIAN PARAPODIA ( Fig. 16F View Fig ). With dorsal cirrus 2 × as long as dorsal ligule, slightly longer than ventral cirrus. Dorsal ligule as long as wide, subconical, blunt; median ligule rounded; both ligules subequal, 2.5 × as long as neuracicular ligule, with glandular areas unpigmented, extended along ligular bases. Neuracicular ligule subconical, blunt, wider than long; ventral ligule digitiform, slightly longer than wide, 2× as long as neuracicular ligule. Notochaetae 9 heterogomph spinigers. Supracicular neurochaetae: 4 homogomph spinigers and 3 heterogomph falcigers with blades spinulose, 3× as long as wide, distal tooth incurved, tendons barely visible; subacicular neurochaetae: 3 heterogomph spinigers and 7 heterogomph falcigers with blades spinulose, 3–5× as long as wide, distal tooth incurved, tendons barely visible.

POSTERIOR PARAPODIA ( Fig. 16G View Fig ). With dorsal and ventral cirri 5–6 × as long as wide, dorsal cirrus about 2 × as long as dorsal ligule, ventral cirrus shorter than ventral ligule. Dorsal and median ligules subequal, blunt, subconical to digitiform, 2 × as long as wide, glandular areas unpigmented, darker along ligular bases. Neuracicular ligule subconical, 2× as wide as long; ventral ligule digitiform, 2 × as long as wide, 2× as long as neuracicular ligule. Notochaetae: 4 homogomph spinigers and 1–2 homogomph falcigers with blades spinulose, 4× as long as wide, tip incurved, tendon visible. Supracicular neurochaetae: 5 homogomph spinigers and 2 heterogomph falcigers with blades spinulose, 2× as long as wide, distal tooth incurved, fused to blade; subacicular neurochaetae: 2 heterogomph spinigers and 3 heterogomph falcigers with blades spinulose, 2× as long as wide, distal tooth incurved, fused to blade.

SUBTERMINAL CHAETIGERS ( Fig. 16H View Fig ). With dorsal cirrus 2.3× as long as dorsal ligule, almost 2× as long as ventral cirrus. Dorsal notopodial ligule digitiform, 2.5 × as long as wide, slightly longer than median one; median ligule digitiform, 2× as long as wide, 2× as long as neuracicular ligule. Neuracicular ligule truncate, slightly wider than long; ventral ligule digitiform, 2 × as long as neuracicular ligule. Notochaetae: 3 homogomph spinigers and 1 homogomph falciger, blade spinulose, about 3× as long as wide, distal tooth incurved and fused to blade. Supracicular neurochaetae: 5 homogomph spinigers and 2 heterogomph falcigers with blades spinulose, almost 2× as long as wide, distal tooth incurved, fused to blade; subacicular neurochaetae: 4 heterogomph spinigers and 3 heterogomph falcigers with blades spinulose, 3× as long as wide, distal tooth incurved, fused to blade.

POSTERIOR REGION. Tapered into a blunt cone. Pygidium with anus terminal, anal cirri as long as last 6–8 chaetigers.

Remarks

Nereis lucipeta Ehlers, 1908 was described based on prenatatory male epitokes dredged in Big-Fish Bay, Angola ( Valdivia , stn 76, 16°33′ S, 11°46′ E; 14 m). Ehlers (1913: 496) recorded atoke specimens but regarded this species as a junior synonym of N. splendida Grube, 1840 . This latter record was regarded as a synonym of “ N. falsa ” by Fauvel (1919), after finding it in Madagascar. This same conclusion was followed by Hartman (1959) and Day (1967). However, N. lucipeta must be reinstated.

The main difference between the male epitokes of N. lucipeta and those of N. splendida is in the number of chaetigers in the non-natatory region, as indicated in the key below. In N. lucipeta the anterior region includes 20 chaetigers, whereas in N. splendida , it has 27. An additional difference is in the shape of the prostomium and the size of the palpophores. In N. lucipeta the anterior prostomial region is longer than the posterior, ocular one, and the palpophores are markedly swollen, projected laterally beyond the level of the lateral eyes, whereas in N. splendida the anterior prostomial region is as long as, or shorter than, the posterior ocular one, and the palpophores are not so markedly swollen.

The atokes of what could be regarded as N. lucipeta were briefly characterized by Day (1962: 639), under the name of N. falsa , based on some specimens from Natal, and later he keyed out the atokes and provided an extended diagnosis ( Day 1967: 317). These records are herein regarded as N. lucipeta because of the similarities in parapodial and pharyngeal features, although the anterior end of an atoke has not been illustrated before.

As indicated in the key below, by having short tentacular cirri N. lucipeta resembles N. callaona and N. callaona sensu Augener 1918 from Western Africa. However, typical N. callaona can be separated from the two other species because its jaws only have 4 denticles, whereas the two other species have 6–7 denticles. The main difference between N. lucipeta and N. callaona from Western Africa are in the pharyngeal areas II and III, because N. lucipeta has 18–20 paragnaths in II and about 30 paragnaths in III, whereas N. callaona sensu Augener has 28 paragnaths in II and about 50 in III.

Distribution

From Angola to Madagascar, in shallow water.

ZMB

Germany, Berlin, Museum fuer Naturkunde der Humboldt-Universitaet

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Nereididae

Genus

Nereis

Loc

Nereis lucipeta Ehlers, 1908

Salazar-Vallejo, Sergio I., León-González, Jesús Angel De & Conde-Vela, Víctor M. 2021
2021
Loc

Nereis (Nereis) falsa

Day J. H. 1967: 317
1967
Loc

Nereis lucipeta

Hartman O. 1959: 262
1959
Loc

Nereis falsa

Fauvel P. 1919: 398
1919
Loc

Nereis splendida

Ehlers E. 1913: 496
1913
Loc

Nereis lucipeta

Ehlers E. 1908: 71
1908
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF