Cortezura lluchbeldai, Jarquín-Martínez & Gálvez-Zeferino & Morales-Zárate & Salinas-Zavala, 2023

Jarquín-Martínez, Ubaldo, Gálvez-Zeferino, Neysi, Morales-Zárate, María Verónica & Salinas-Zavala, César Augusto, 2023, Four new species of anthuroids (Peracarida: Isopoda) from the temperate-tropical transition zone of the western coast of Baja California Peninsula, Mexico, Zootaxa 5360 (1), pp. 91-112 : 98-102

publication ID	https://doi.org/ 10.11646/zootaxa.5360.1.5
publication LSID	lsid:zoobank.org:pub:0A0697C3-4480-49E0-B7D2-32478F1EDDB9
DOI	https://doi.org/10.5281/zenodo.10164816
persistent identifier	https://treatment.plazi.org/id/03FD386C-5C14-9B56-99D6-FE37FC9566EF
treatment provided by	Plazi
scientific name	Cortezura lluchbeldai
status	sp. nov.

Treatment

Cortezura lluchbeldai sp. nov.

Figs 5–7 View FIGURE 5 View FIGURE 6 View FIGURE 7

Material examined. Holotype: CIB-0058_ISO 5, adult female, 9.8 mm, Guerrero Negro Lagoon, Baja California Peninsula (station 9, in fine sand, 5.0 m), Nov 14, 2017, coll. M. V. Morales-Zárate.

Paratype: CIB-0059_ISO 6, 1 adult female, same sampling station as the holotype.

Additional material: CIB-0060_ISO 7, 1 adult female, station 7, fine sand, 11.6 m, Jan 17,2018, coll. M. V. Morales-Zárate; CIB-0061_ISO 8, 1 adult female, station 9, fine sand, 5.0 m, Jan 17, 2018, coll. M. V. Morales-Zárate; CIB-0062_ISO 9, 1 adult female, station 9, fine sand, 5.0 m, Jan 17, 2018, col. M. V. Morales-Zárate .

Diagnosis: Body 13.6 times longer than wide; pleon 1.2 times longer than wide and slightly larger than pereonite 7. Antennula with three aesthetascs. Article 1 of mandibular palp with one proximal seta, article 2 with 10 setae. Palm of pereopod 1 slightly medially projected with a row of 20 robust setae. Exopod of pleopod. 1 strongly emarginated, with approximately 40 distal setae. Pleotelson distally narrow, truncated apex with eight subapical and six apical setae.

Holotype description (adult female CIB-0058_ISO 5): Body length ( Figs. 5A, B View FIGURE 5 ) 9.8 mm, 13.6 times longer than wide. Cephalon 1.1 times longer than wide and 0.5 the length of the pereonite 1; eyes absent. Pereonite 1 and 2 cylindrical, pereonites 3–6 rectangular, pereonite 7 square, 0.6 times the length of pereonite 6. Pleon 1.2 times longer than wide and slightly longer than pereonite 7, pleonites fused. Pleotelson distally narrow, truncated apex with eight subapical and six apical setae.

Antennula ( Fig. 5C View FIGURE 5 ) with three peduncular and three flagellar articles. Peduncular article 1 as long as articles 2 and 3, with three dorsal plumose sensorial and 10 simple setae; article 2 0.5 times the length of article 1, with nine dorsal smooth and one dorsal plumose sensorial seta; article 3 0.8 times the length of the second one, with five ventral and five distal setae. Flagellum approximately 0.7 times the length of the peduncular article 3; distal article with three aesthetascs.

Antenna ( Fig. 5D View FIGURE 5 ) with five peduncular articles and four flagellar articles. Peduncular article 1 0.3 times the length of article 2; article 2 the largest, 0.7 times length of distal articles; article 3 rectangular, 0.4 times length of article 2, with two distal short setae; article 4 sub-square, 0.8 times length of article 3, with four distal setae; article 5 cylindrical, with one dorsodistal sensorial and four simple setae. Flagellum almost half the length of peduncular article 5; distal article with numerous fine setae.

Mandible ( Fig. 5E View FIGURE 5 ) palp with two articles. Article 1 0.5 times length of the 2, with a slender proximal and one long distal seta; article 2 with 10 long setae. Incisor with four cusps, lamina dentata with approximately 12 denticles, molar acute.

Maxilla ( Fig. 5F View FIGURE 5 ) dorsodistally folded, with seven distal teeth.

Maxilliped ( Fig. 5G View FIGURE 5 ) with tri-articulate palp. Palp article 1 rectangular, 0.6 times length of second, with a long distal seta; article 2 with three medial and two apical setae; article 3 the smallest, oblique, internal margin with four thick setae.

Pereopod 1 ( Fig. 6A, B View FIGURE 6 ) subchelate, robust. Ischium thinner than the basis. Carpus triangular, rounded apically with a group of nine medial setae. Propodus broad, with 19 ventral setae. Palm slightly medially projected with one row of 20 robust setae. Dactylus with ventrodistal short spine seta and four distal short setae. Unguis longer than dactylus.

Pereopods 2–3 ( Fig. 6C, D View FIGURE 6 ) with numerous long setae. Basis cylindrical, with dorsal plumose sensorial setae and one long simple seta. Ischium distally narrow, with six dorsal setae, internal margin rugose with a row of simple setae. Merus with numerous ventral long setae. Carpus triangular, with two robust apical setae and numerous thin setae. Propodus oval elongated, 1.8 times longer than wide in P2 and 1.5 times longer than wide in P3; internal margin with 3–4 short, one long setae, and ventrodistal short spine seta.

Pereopods 4–7 ( Fig. 6E–F View FIGURE 6 ; 7A–B View FIGURE 7 ) with numerous long setae. Basis with plumose sensorial and one long simple seta. Ischium with numerous setae in the internal margin. Merus distally narrow, rugose internal margin, with numerous long setae. Carpus pentagonal, with one distal short spine seta and along simple setae; external margin with one plumose seta. Propodus of pereopod 7 cylindrical, 3.5 times longer than wide, internal margin with setulated scales and two pectinated spines.

Pleopod 1 ( Fig. 7C View FIGURE 7 ) operculiform exopod, 2.6 times longer than wide, with a strong distolateral emargination, distal margin with approximately 40 plumose setae. Endopod cylindrical, 0.5 times the width of the exopod, with seven distal setae.

Pleopod 2 ( Fig. 7D View FIGURE 7 ) exopod 2.7 times longer than wide, slightly emarginated in the distal region, narrow apex, rounded, with 19 plumose setae. Endopod slightly longer than the exopod with 10 distal setae.

Uropod ( Fig. 7E, F View FIGURE 7 ) rectangular protopod, 2 times longer than basal width, with a ventrodistal plumose seta. Endopod lanceolated, 1.5 times the length of the protopod, with a group of smooth setae in the distal region and a row of five setae in the external margin. Exopod auriculiform, 2.6 times longer than wide, external margin with numerous short plumose setae accompanied with smooth setae; dorsal surface covered with short setae.

Etymology: This species is named in memory and honoring Dr. Daniel Lluch-Belda, a Mexican scientist who dedicated part of his scientific legacy to the study of marine climate transition zones in northwestern Mexico.

Habitat: In soft bottom, fine sand.

Geographic distribution: Coastal lagoon of the temperate-tropical climatic transition zone of the Mexican Pacific, western coast of the Baja California Peninsula: Guerrero Negro Lagoon, Baja California, Mexico .

Remarks: Besides the new species, three species of the genus Cortezura : C. penascoensis Schultz, 1977 ; C. confixa ( Kensley, 1978) ; and C. caeca Jarquín-Martínez & García-Madrigal, 2021 have been described.Among these species, C. lluchbeldai sp. nov. is the most similar to C. penascoensis in the shape of the mandible and pereopod 1. However, they differ in that the new species shows 19 setae in the palm (vs. 10 setae in C. penascoensis ), antennula with numerous long setae (vs. setae present only in article 3). C. lluchbeldai sp. nov. also differs from C. caeca in the number of palm setae (13 short setae in C. caeca ) and the first mandibular palp article shows a proximal seta (vs. absent in C. caeca ). Likewise, it distinguishes from C. confixa in the telson shape and palm projection, in C. lluchbeldai sp. nov. distally narrow and the palm slightly projected (vs. rounded and with a denticle strongly projected, respectively in C. confixa ).

Cortezura lluchbeldai sp. nov. is distinguished from all other species by the following characteristics: (1) maxillipedal palp with three articles; (2) exopod of the pleopod 1 with a strong emargination in the distolateral region; and (3) distal article of the mandibular palp with 10 setae.