Nicon salinus Hernandez-Alcantara & Davila-Jimenez 2025, sp. nov.

Nicon salinus Hernández-Acántara & Dávila-Jiménez sp. nov. Materials Type status: Holotype. Occurrence: catalogNumber: CNAP-POH- 39-003; recordedBy: Yasmín Dávila-Jiménez; individualCount: 1; lifeStage: adult; occurrenceStatus: present; preparations: 70 % EtOH; disposition: in collection; occurrenceID: 1EB9D302-9286-5C39-8966-5C9A5EEC3762; Taxon: scientificName: Nicon salinus Hernández-Alcántara & Dávila-Jiménez; kingdom: Animalia; phylum: Annelida; class: Polychaeta; order: Phyllodocida; family: Nereididae; genus: Nicon; specificEpithet: salinus; taxonRank: species; scientificNameAuthorship: Hernández-Alcántara & Dávila-Jiménez; nomenclaturalCode: ICZN; Location: continent: North America; waterBody: Southern Gulf of Mexico; country: Mexico; countryCode: MX; stateProvince: Yucatán; locality: Río Lagartos, hypersaline coastal lagoon; verbatimDepth: 1.03 m; locationRemarks: hypersaline coastal lagoon; verbatimLatitude: 21°35.74'N; verbatimLongitude: 88°04.28'W; verbatimCoordinateSystem: degrees decimal minutes; Event: samplingProtocol: Ponar standard dredge 0.052 m 2; eventDate: 19-05 - 2005; habitat: 14.3 % silt, 69.9 % sand, 15.8 % gravel, 31.5 ° C, 34.3 psu, 7.21 mg / l, pH 8.16; fieldNumber: 15 - RL 1805; Record Level: institutionCode: ICML-UNAM; collectionCode: CNAP; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: catalogNumber: CNAP-POP- 39-005; recordedBy: Yasmín Dávila-Jiménez; individualCount: 8; lifeStage: adult; occurrenceStatus: present; preparations: 70 % EtOH; disposition: in collection; occurrenceID: 3C2085B4-BD95-59C5-BF36-EB11CC6B9FC9; Taxon: scientificName: Nicon salinus Hernández-Alcántara & Dávila-Jiménez; kingdom: Animalia; phylum: Annelida; class: Polychaeta; order: Phyllodocida; family: Nereididae; genus: Nicon; specificEpithet: salinus; taxonRank: species; scientificNameAuthorship: Hernández-Alcántara & Dávila-Jiménez; nomenclaturalCode: ICZN; Location: continent: North America; waterBody: Southern Gulf of Mexico; country: Mexico; countryCode: MX; stateProvince: Yucatán; locality: Río Lagartos, hypersaline coastal lagoon; verbatimDepth: 1.09 m; locationRemarks: hypersaline coastal lagoon; verbatimLatitude: 21°36.46'N; verbatimLongitude: 88°08.12'W; verbatimCoordinateSystem: degrees decimal minutes; Event: samplingProtocol: Ponar standard dredge 0.052 m 2; eventDate: 19-05 - 2018; habitat: 6.9 % silt, 66.8 % sand, 26.28 % gravel, 30.5 ° C, 35.19 psu, 9.87 mg / l, pH 8.39; fieldNumber: 12 - RL 1805; Record Level: institutionCode: ICML-UNAM; collectionCode: CNAP; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: catalogNumber: CNAP-POP- 39-006; recordedBy: Yasmín Dávila-Jiménez; individualCount: 2; lifeStage: adult; occurrenceStatus: present; preparations: coated with gold; disposition: in collection; occurrenceID: 8CCD5200-0822-5099-B539-B648643070C8; Taxon: scientificName: Nicon salinus Hernández-Alcántara & Dávila-Jiménez; kingdom: Animalia; phylum: Annelida; class: Polychaeta; order: Phyllodocida; family: Nereididae; genus: Nicon; specificEpithet: salinus; taxonRank: species; scientificNameAuthorship: Hernández-Alcántara & Dávila-Jiménez; nomenclaturalCode: ICZN; Location: continent: North America; waterBody: Southern Gulf of Mexico; country: Mexico; countryCode: MX; stateProvince: Yucatán; locality: Río Lagartos, hypersaline coastal lagoon; verbatimDepth: 1.09 m; locationRemarks: hypersaline coastal lagoon; verbatimLatitude: 21°36.46'N; verbatimLongitude: 88°08.12'W; verbatimCoordinateSystem: degrees decimal minutes; Event: samplingProtocol: Ponar standard dredge 0.052 m 2; eventDate: 19-05 - 2018; habitat: 6.9 % silt, 66.8 % sand, 26.28 % gravel, 30.5 ° C, 35.19 psu, 9.87 mg / l, pH 8.39; fieldNumber: 12 - RL 1805; Record Level: institutionCode: ICML-UNAM; collectionCode: CNAP; basisOfRecord: specimens coated with gold for SEM studies Type status: Paratype. Occurrence: catalogNumber: CNAP-POP- 39-007; recordedBy: Yasmín Dávila-Jiménez; individualCount: 5; lifeStage: adult; occurrenceStatus: present; preparations: 70 % EtOH; disposition: in collection; occurrenceID: E0E83DBD-1A2D-57CD-81AF-FA6092D56DB9; Taxon: scientificName: Nicon salinus Hernández-Alcántara & Dávila-Jiménez; kingdom: Animalia; phylum: Annelida; class: Polychaeta; order: Phyllodocida; family: Nereididae; genus: Nicon; specificEpithet: salinus; taxonRank: species; scientificNameAuthorship: Hernández-Alcántara & Dávila-Jiménez; nomenclaturalCode: ICZN; Location: continent: North America; waterBody: Southern Gulf of Mexico; country: Mexico; countryCode: MX; stateProvince: Yucatán; locality: Río Lagartos, hypersaline coastal lagoon; verbatimDepth: 1.03 m; locationRemarks: hypersaline coastal lagoon; verbatimLatitude: 21°35.74'N; verbatimLongitude: 88°04.28'W; verbatimCoordinateSystem: degrees decimal minutes; Event: samplingProtocol: Ponar standard dredge 0.052 m 2; eventDate: 19-05 - 2005; habitat: 14.3 % silt, 69.9 % sand, 15.8 % gravel, 31.5 ° C, 34.3 psu, 7.21 mg / l, pH 8.16; fieldNumber: 15 - RL 1805; Record Level: institutionCode: ICML-UNAM; collectionCode: CNAP; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence: catalogNumber: CNAP-PO- 39-034 / 2025 - GMX-LE; recordedBy: Yasmín Dávila-Jiménez; individualCount: 7; lifeStage: adult; occurrenceStatus: present; preparations: 70 % EtOH; disposition: in collection; occurrenceID: 64C2C811-6FA9-5B81-B86A-2EC2325FA5A0; Taxon: scientificName: Nicon salinus Hernández-Alcántara & Dávila-Jiménez; kingdom: Animalia; phylum: Annelida; class: Polychaeta; order: Phyllodocida; family: Nereididae; genus: Nicon; specificEpithet: salinus; taxonRank: species; scientificNameAuthorship: Hernández-Alcántara & Dávila-Jiménez; nomenclaturalCode: ICZN; Location: continent: North America; waterBody: Southern Gulf of Mexico; country: Mexico; countryCode: MX; stateProvince: Yucatán; locality: Río Lagartos, hypersaline coastal lagoon; verbatimDepth: 1.09 m; locationRemarks: hypersaline coastal lagoon; verbatimLatitude: 21°36.46'N; verbatimLongitude: 88°08.12'W; verbatimCoordinateSystem: degrees decimal minutes; Event: samplingProtocol: Ponar standard dredge 0.052 m 2; eventDate: 19-05 - 2018; habitat: 6.9 % silt, 66.8 % sand, 26.28 % gravel, 30.5 ° C, 35.19 psu, 9.87 mg / l, pH 8.39; fieldNumber: 12 - RL 1805; Record Level: institutionCode: ICML-UNAM; collectionCode: CNAP; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence: catalogNumber: CNAP-PO- 39-034 / 2026 - GMX-LE; recordedBy: Yasmín Dávila-Jiménez; individualCount: 8; lifeStage: adult; occurrenceStatus: present; preparations: 70 % EtOH; disposition: in collection; occurrenceID: 45D22B06-60DE-5337-8BCE-BC242D073016; Taxon: scientificName: Nicon salinus Hernández-Alcántara & Dávila-Jiménez; kingdom: Animalia; phylum: Annelida; class: Polychaeta; order: Phyllodocida; family: Nereididae; genus: Nicon; specificEpithet: salinus; taxonRank: species; scientificNameAuthorship: Hernández-Alcántara & Dávila-Jiménez; nomenclaturalCode: ICZN; Location: continent: North America; waterBody: Southern Gulf of Mexico; country: Mexico; countryCode: MX; stateProvince: Yucatán; locality: Río Lagartos, hypersaline coastal lagoon; verbatimDepth: 0.61 m; locationRemarks: hypersaline coastal lagoon; verbatimLatitude: 21°35.73'N; verbatimLongitude: 88°04.28'W; verbatimCoordinateSystem: degrees decimal minutes; Event: samplingProtocol: Ponar standard dredge 0.052 m 2; eventDate: 28-02 - 2018; habitat: 49.3 % silt, 50.1 % sand, 0.6 % gravel, 26.7 ° C, 54.46 psu, 8.09 mg / l, pH 8.24; fieldNumber: 15 - RL- 1802; Record Level: institutionCode: ICML-UNAM; collectionCode: CNAP; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence: catalogNumber: CNAP-PO- 39-034 / 2027 - GMX-LE; recordedBy: Yasmín Dávila-Jiménez; individualCount: 5; lifeStage: adult; occurrenceStatus: present; preparations: 70 % EtOH; disposition: in collection; occurrenceID: 50C8E210-996E-54B1-86F7-56172AC00AA5; Taxon: scientificName: Nicon salinus Hernández-Alcántara & Dávila-Jiménez; kingdom: Animalia; phylum: Annelida; class: Polychaeta; order: Phyllodocida; family: Nereididae; genus: Nicon; specificEpithet: salinus; taxonRank: species; scientificNameAuthorship: Hernández-Alcántara & Dávila-Jiménez; nomenclaturalCode: ICZN; Location: continent: North America; waterBody: Southern Gulf of Mexico; country: Mexico; countryCode: MX; stateProvince: Yucatán; locality: Río Lagartos, hypersaline coastal lagoon; verbatimDepth: 1.03 m; locationRemarks: hypersaline coastal lagoon; verbatimLatitude: 21°35.74'N; verbatimLongitude: 88°04.28'W; verbatimCoordinateSystem: degrees decimal minutes; Event: samplingProtocol: Ponar standard dredge 0.052 m 2; eventDate: 19-05 - 2005; habitat: 14.3 % silt, 69.9 % sand, 15.8 % gravel, 31.5 ° C, 34.3 psu, 7.21 mg / l, pH 8.16; fieldNumber: 15 - RL 1805; Record Level: institutionCode: ICML-UNAM; collectionCode: CNAP; basisOfRecord: PreservedSpecimen Description Holotype complete, with 84 segments, 30 mm long, 2 mm wide at chaetiger 15 (without chaetae). Paratypes incomplete, with 20–56 segments, 4–25 mm long, 0.8–1.0 mm wide. Colour in ethanol light brown. Prostomium slightly wider than long with a frontal cleft; two small frontal digitate antennae (Fig. 1 A). Two pairs of eyes in trapezoidal arrangement, similar in size (Fig. 2 A). Palps biarticulate, palpophore well developed, barrel-shaped, with subspherical palpostyles (Fig. 1 A, Fig. 2 A). Peristomium slightly longer than chaetiger 1, with four pairs of tentacular cirri, short, the longest postero-dorsally reaching to chaetiger 2 (Fig. 1 A). Oral and maxillary pharyngeal rings without paragnaths or papillae; jaws brown, with 5 teeth on the dentate cutting edge. First two chaetigers sub-birramous; notopodia without aciculae, represented by a subulate dorsal ligule and short dorsal cirrus (Fig. 1 B); neuropodia with subulate postchaetal lobe and ventral ligules and short ventral cirrus (Fig. 1 C), only bearing homogomph spi