Colanthura guerreronegroensis, 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 : 107-110

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.10247277
persistent identifier	https://treatment.plazi.org/id/03FD386C-5C03-9B49-99D6-FE12FCAD6217
treatment provided by	Plazi
scientific name	Colanthura guerreronegroensis
status	sp. nov.

Treatment

Colanthura guerreronegroensis sp. nov.

Figs 11–13 View FIGURE 11 View FIGURE 12 View FIGURE 13

Material examined. Holotype: CIB-0069_ISO 16, adult female, 8.7 mm, Guerrero Negro Lagoon, Baja California Peninsula (station 4, in fine sand, 8.0 m), Sep 12, 2017, coll. M. V. Morales-Zárate.

Additional material: CIB-0070_ISO 17, 15 adult females, station 5, in fine sand, 8.2 m, Nov 7, 2012, coll. M. V. Morales-Zárate; CIB-0071_ISO 18, 17 adult females, 6 ovigerous females, station 8, in fine sand, 2.5 m, Nov 6, 2012, coll. M. V. Morales-Zárate; CIB-0071_ISO 19, 1 adult female, station 10, in fine sand, 8.2 m, Sep 6, 2012, coll. M. V. Morales-Zárate .

Diagnosis: Body 9.6 longer than wide; pleon as large as wide, subequal at the length of the pereonite 6 and 7. Pereopod 1 oval propodus, 1.5 times longer than wide, with a group of nine mesial robust setae; propodus of pereopods 2 and 3 with six spine setae; pereopods 4–6 with two medial spine setae. Exopod of pleopod 1 two times longer than wider, with 16 distal setae. Sub-circular uropodal endopod, 1.2 times longer than wider; uropodal exopod 1.7 times longer than wider. Pleotelson 2.2 times longer than wider.

Holotype description (adult female CIB-0069_ISO 16): Body length 5 mm ( Fig. 11A, B View FIGURE 11 ), 9.6 times longer than wider; color brown; cephalon 1.1 times longer than wider and 0.8 times the length of the pereonite 1. Pleon as long as wide, subequal at the length of the pereonites 6 and 7. Pleotelson 2.4 times larger than wider.

Antennula ( Fig. 11C View FIGURE 11 ) with three peduncular and three flagellar articles. Peduncular articles 1 and 2 with plumose sensorial setae; article 1 1.4 times longer than article 2; article 3 rectangular, as long as article 2. Flagellum 0.8 times the length of the last peduncular article, article 3 with three aesthetascs.

Antenna ( Fig. 11D View FIGURE 11 ) with five peduncular and three flagellar articles. Peduncular article 2 long, 0.6 times the length of articles 3 and 4 jointly, article 3 longer than wider; article 4 distally narrow with one long simple seta and two plumose sensorial setae; article 5 cylindrical, 1.4 times longer than article 4. Flagellum much shorter than the last peduncular article, with numerous setae.

Mandible ( Fig. 11E View FIGURE 11 ) reduced, conical, palp absent.

Maxilla ( Fig. 11F View FIGURE 11 ) styliform, with 11 distal denticles.

Maxilliped ( Fig. 11G View FIGURE 11 ) with two articles; article 1 long, with two distomedial short and four long setae; article 2 minute, with a group of four setae.

Pereopod 1 (12A) subchelate. Basis cylindrical, 2.1 times longer than wider. Ischium as long as the basis. Merus shorter than the ischium, with one ventrodistal and two dorsoproximal setae. Carpus triangular, with four distal setae. Propodus oval, 1.5 times longer than wider, with a group of nine mesial robust setae, palm with eight marginal and three ventral short setae.

Pereopod 2–3 ( Fig. 12B, C View FIGURE 12 ) similar in shape. Basis with sensorial setae. Merus distally narrow, with one ventrodistal and two dorsodistal setae. Carpus triangular, with three distal setae. Propodus of P2 1.7 times longer than wider, palm with five spine setae; propodus of P3 1.8 times longer than wider, palm with six spine setae.

Pereopod 4–6 ( Fig. 12D – F View FIGURE 12 ) basis with plumose sensorial setae. Merus distally narrow, with two ventrodistal and two dorsodistal setae. Carpus with two ventral spine setae, 2–3 ventrodistal, and two dorsodistal setae. Propodus 1.8 times longer than wider in P4 and 3.1 in P5 and P6, internal margin with setulated scales, two medial and one distal spine setae.

Pleopod 1 ( Fig. 13A View FIGURE 13 ) exopod operculiform, 2 times longer than wider, distal margin with 16 plumose setae. Endopod approximately 0.2 times the width of the exopod, distal margin with 11 plumose setae.

Pleopod 2 ( Fig. 13B View FIGURE 13 ) exopod 2.4 times longer than wider, with eight distal plumose setae. Endopod shorter than the exopod, 0.7 times wider than the exopod, with four distal plumose setae.

Uropod ( Fig. 13C, D View FIGURE 13 ) rectangular protopod, distally 1.6 longer than wider. Endopod sub-circular, 1.2 times longer than wider, slightly shorter than the protopod; margin with simple and some sensory setae. Exopod filiform, 1.7 times longer than wider, with approximately 23 plumose setae accompanied by smooth setae.

Etymology: This species is named after the coastal Guerrero Negro Lagoon off the western coast of the Baja California Peninsula where the type material was collected.

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: Colanthura guerreronegroensis sp. nov. is similar to C. bruscai Poore, 1984 by the shape of the antennae and number of aesthetascs, pleon subequal to pereonite 6 + 7, as long as wide, and the setae pattern in the palm of the pereopods 1–3. However, differs because in C. guerreronegroensis sp. nov. the propodus of pereopod 1 is 1.5 times longer than wide and 1.7–1.8 in the pereopod 2–3; sixth segment of the pleotelson is a strongly distal lobule, and the telson is 2.1 times longer than wider; while C. bruscai the pereopod 1 propodus is 1.3 times longer than wider and 1.5 times longer than wider in pereopod 2; the lobules of the sixth segment of the pleotelson are short and straight, and the pleotelson is 1.3 times longer than wider.