Lumbrineris jan, Martin & Estefa & Gil, 2022

Martin, Daniel, Estefa, Jordi & Gil, Joao, 2022, Taxonomic review of Gallardoneris nonatoi (Ramos, 1976) comb. nov. (Annelida, Lumbrineridae), and description of a new species of Lumbrineris from the Gulf of Mexico, ZooKeys 1114, pp. 35-57 : 35

Lumbrineris jan sp. nov.

Fig. 6

Lumbrineris nonatoi [non Ramos, 1976] - Carrera-Parra 2001a: 606, fig. 4A-F; Carrera-Parra 2006b: 45-46, fig. 14F-J; Carrera-Parra 2009: 271.

Lumbrineris sp. D - Uebelacker 1984: 41.44-41.45, figs 41.41-41.42A-H.

Type material.

Holotype: ECOSUR 298, off Tamaulipas, Mexico, COLT-III E31, 01.05.1992, 34 m. Paratypes: ECOSUR 299, 1 specimen, off Tamaulipas, Mexico, COLT-43 E43, 01.05.1992; ECOSUR 300, 1 specimen, off Tamaulipas, Mexico, COLT-III E19, 01.05.1992; ECOSUR 301, 3 specimens, off North Veracruz, Mexico, 23 m, EMOAPP-II E5, 01.05.1992.

Additional material.

As Lumbrineris nonatoi . Gulf of Mexico: Non-type specimens: 1 specimen (USNM 75350), off Florida , USA, 26°45'50"N, 82°45'11"W, 24 m, Sofla St. 2B, November 1980 ; 2 specimens (USNM 90998), off Port Isabel , Texas, USA, 26°10'N, 97°08'W, 15 m, Stocs St. 4/IV-3, Spring 1976 ; 1 specimen (CP-ICML-UNAM unknown catalogue number), off Veracruz , Mexico, IMCA 2, St. 18, September 1988 ; 2 specimens (CP-ICML-UNAM unknown catalogue number), off Veracruz, Mexico, IMCA 2, St. 76, 27 September 1988 ; 2 specimens (ECOSUR-P 1673), off Sontecomapan , Veracruz, Mexico, 18°35'N, 94°52'W, M1E1 ; 1 specimen (ECOSUR-P 1674), off Punta San Juan , Veracruz, Mexico, 18°20'N, 94°38'W, M1E5 ; 1 specimen (ECOSUR-P 1675), off Coatzacoalcos , Veracruz, Mexico, 18°11'N, 94°25'W, M1E6 ; 3 specimens (ECOSUR-P 1676), off Coatzacoalcos , Veracruz, Mexico, 18°20'N, 94°25'W, M1E7 ; 1 specimen (ECOSUR-P 1677), off Carmen Lagoon , Tabasco, Mexico, 18°23'N, 93°48'W, M1E14 ; 2 specimens (ECOSUR-P 1678), off Tamiahua Lagoon , Veracruz, Mexico, 21°31'15.78"N, 97°26'59.98"W, 23 m, EMOAPP-II E6, 01.05.1992 ; 1 specimen (ECOSUR-P 1680), off Tamiahua Lagoon , Veracruz, Mexico, 21°31'59.93"N, 97°28'30.48"W, 52 m, COLT-I E33, 01.05.1992 ; 1 specimen (ECOSUR-P 1681), Tamaulipas, Mexico, 27 m, COLT-III E11-COSTA, 01.05.1992 ; 1 specimen (ECOSUR-P 1682), off North Veracruz, Mexico, 56 m, EMOAPP-II E8 ; 1 specimen (ECOSUR-P 1687), off Campeche, Mexico, 18°58'N, 92°02'W, 20 m, PROMEX-III E30, 14.07.1984 ; 1 specimen (ECOSUR-P 1688), Campeche, Mexico, 08.08.1984 , according to GBIF Secretariat (2021) [probably corresponding to specimen recorded in Carrera-Parra (2001a, 2006b) as " Gulf of Mexico, E7PROMEX-III(1) Gulf of Mexico "] ; 1 specimen (ECOSUR-P 1689), off Punta Zapotitlan , Veracruz, Mexico, 18°31'N, 94°36'W, 63 m, PROMEX-III E12, 10.08.1984 .

Main diagnostic characters.

Adapted from Carrera-Parra (2001a; 2006b). Prostomium globular, short, ca. as long as wide, lacking antennae and eyes. Peristomium shorter than prostomium, with two rings of similar size. Maxillary apparatus with five pairs of maxillae; maxillary carriers as long as MI, anterior end constricted; MI forceps-like with attachment lamella well developed; MII as long as MI, with wide connecting plates slightly developed and three robust teeth; MIII unidentate; MIV unidentate; MV free, prominent, lateral to MIII and MIV (Fig. 6A ). Mandibles translucent, fused for ~ 2/3 of their length (Fig. 6B ). Anterior parapodia with prechaetal lobe elongated, gradually increasing to become longer than postchaetal lobe in last body 1/3 (Fig. 6C ); postchaetal lobe well developed from first parapodium, digitiform. Composite multidentate hooded hooks up to chaetiger 19, with short blades, having five teeth similar in size and a long hood with a characteristic second swelling at shaft end (Fig. 6D ); from chaetiger 20, replaced by simple multidentate hooded hooks, with six teeth, proximal one larger (Fig. 6E ). Aciculae yellow, aristate, up to three in anterior parapodia, and one in posterior parapodia. Pygidium with two anal cirri according to Carrera-Parra (2001a), with two rounded lobes and without cirri, according to Uebelacker (1984).

Type locality.

Off Tamaulipas, Mexico, Gulf of Mexico (approx. 24°00'N, 97°30'W).

Known distribution.

Central Atlantic Ocean, Gulf of Mexico; 15-56 m depth.

Etymology.

The specific epithet Lumbrineris jan is a noun in apposition. The species is dedicated to the loving memory of Jan Ventura Buchaca (2008-2020), a brave young fighter, son of Teresa and Marc and brother of Sara. " Every time a bell rings an angel gets his wings ", but Jan got his far too soon.

Remarks.

The species was carefully described and illustrated by Carrera-Parra (2001a; 2006b) and thus we are only providing its main diagnostic characters. Lumbrineris jan sp. nov. agrees with G. nonatoi comb. nov. in having composite hooks with short blades and a long hood with a characteristic second swelling at shaft end, near the joint with the blade, as well as prechaetal lobes longer than postchaetal ones in most posterior segments. However, it can be clearly distinguished by having a fifth pair of maxillae (four in G. nonatoi comb. nov.), blades of composite hooks longer than in G. nonatoi comb. nov., five small teeth on composite hooks (vs. 6-8 in G. nonatoi comb. nov.) and six small teeth in simple hooks (vs. seven or eight in G. nonatoi comb. nov.). Besides, it has two anal cirri (vs. none in G. nonatoi comb. nov.), as seen in the description by Carrera-Parra (2001a) and, at least, in the specimen here selected as holotype, and likely corresponding also to the two lobes mentioned and illustrated by Uebelacker (1984).

Carrera-Parra (2001a) highlighted the existence of a size-dependent relationship in the number of chaetigers with composite hooded hooks (i.e., r = 0.864, P ≤ 0.01), which agrees with the results of our morphometric analysis based on G. nonatoi comb. nov. There are no other morphometric analyses based on the population from the Gulf of Mexico, precluding comparisons. However, it would be very interesting to analyse not only whether differences may exist in the size-related relationships characterizing these two species, but also among other species of Lumbrineris .

Lumbrineris jan sp. nov. differs clearly from all previously described species of Lumbrineris in having MIII unidentate, aciculae yellow, anterior parapodia with postchaetal lobe digitiform and posterior parapodia with the prechaetal lobe longer than the postchaetal one ( Carrera-Parra 2006b; Cai and Li 2011; Carrera-Parra et al. 2011; Martins et al. 2012). All the other known species of Lumbrineris with MIII unidentate and aciculae yellow show either or both anterior parapodia with postchaetal lobe auricular and postchaetal lobe always longer than the prechaetal one.

Figures

Figure 6. Lumbrineris jan sp. nov. A maxillary apparatus B mandibles C posterior parapodium; pre: prechaetal lobe; post: postchaetal lobe D composite hooded hook E simple hooded hook A, C, D, E redrawn from Carrera-Parra (2006 b) B redrawn from Carrera-Parra (2001 a). Scale bars: 40 µm (D, E); 100 µm (A, B); 1000 µm (C).