Cumella (Cumewingia) carmeinae, Jarquín-González, Jani & García-Madrigal, María Del Socorro, 2013

Jarquín-González, Jani & García-Madrigal, María Del Socorro, 2013, Annotated checklist and keys for cumaceans (Crustacea: Peracarida) from the Tropical Eastern Pacific, with six new species from the Southern Mexican Pacific, Zootaxa 3721 (3), pp. 201-257 : 228-234

Cumella (Cumewingia) carmeinae sp. nov.

Figs 14–17

Type material. Holotype male, UMAR-Pera 494, Corralero Lagoon, Pinotepa Nacional, Oaxaca, mangrove substratum, 1 m, 2 December 2009. Paratypes, 26 males (one dissected), 4 ovigerous females (one dissected), 12 females, UMAR-Pera 495, same locality and date.

Other material examined: 1 ovigerous female, 1 juvenile, UMAR-Pera 496, Coral Beach, Ixtapa Island, Guerrero, 1.5 m, coral, 19 September 2007; 6 juveniles, UMAR-Pera 497, Panteon Beach, Puerto Angel, Oaxaca, 3 m, coral, 23 May 2007; 1 juvenile, UMAR-Pera 498, Estacahuite Beach, Puerto Angel, Oaxaca, 5 m, algae on rock, 9 April 2005; 1 juvenile, UMAR-Pera 499, Estacahuite Beach, Puerto Angel, Oaxaca, 4 m, coral, 1 December 2006; 1 juvenile, UMAR-Pera 500, Estacahuite Beach, Puerto Angel, Oaxaca, 1 m, sand substratum, 31 October 2009; 3 juveniles, UMAR-Pera 501, La Tijera Beach, Pochutla, Oaxaca, 2 m, coral, 30 April 2005; 1 juvenile, UMAR-Pera 502, La Tijera Beach, Pochutla, Oaxaca, 4 m, coral, 12 September 2006.

Diagnosis. Male. With a triangular elevation on dorsal surface of the first three pereonites; endopod of the uropod with seven serrate setae on the inner margin. Female. Endopod of the uropod with six serrate setae on the inner margin.

Description. Adult male, 1.7 mm ( Figs 14 A–B). Carapace oviform, with smooth surface; frontal lobe a fourth of the length of the carapace; ocular lobe with lenses and pigment; antennal notch-like depression; siphons short. In lateral view, carapace with antero-lateral margin. Pereon with a triangular elevation on dorsal surface of the first three pereonites. Exopods present in maxilliped 3 and pereopods 1–4. Pleopods absent.

Antenna 1 ( Fig. 14 C) with first basal article shorter than the following two articles together; second article broader than third article; main flagellum biarticulate; accessory flagellum uniarticulate and reduced. Antenna 2 ( Fig. 14 D) flagellum with long articles. Mandible ( Fig. 14 E), incisor process with three cusps, lacinia mobilis with four cusps. Maxillule ( Fig. 14 F) with two endites, outer endite with nine apical cuspidate setae and five groups of fine hairlike setae; inner endite with four setae and a group of fine hairlike setae; palp with a long seta. Maxilliped 2 ( Fig. 14 G) basis with the same length as the following four articles together; merus with a row of fine hairlike setae on dorsal surface; carpus and propodus of similar proportions; dactylus about a half the length of the propodus, with a terminal cuspidate seta. Maxilliped 3 ( Fig. 15 A) with basis arcuate, longer and broader than the rest of the articles together, with a row of fine hairlike setae on the inner margin; ischium fused to the basis; merus slightly expanded; carpus broader than propodus; propodus narrow at base and curved; dactylus short, with a terminal cuspidate seta.

Pereopod 1 ( Fig. 15 B) basis expanded, with a hyaline lamella on the outer distal margin; ischium shorter than merus; merus about half the length of the carpus; propodus longer than dactylus; dactylus with two small distal setae. Pereopod 2 ( Fig. 15 C) with basis expanded and longer than the rest of the articles together; ischium reduced and bare; merus and carpus of the same length; propodus about half the length of the dactylus; dactylus with six cuspidate setae. Pereopod 3 ( Fig. 15 D) with basis expanded; ischium shorter than merus; merus shorter than carpus; carpus about two times the length of the propodus; propodus broader than dactylus; dactylus pointed. Pereopod 4 ( Fig. 15 E) with basis longer than the rest of the articles together, with a row of fine hairlike setae on the outer medial margin and a pappose seta on the inner margin; ischium shorter than merus; merus shorter than carpus; carpus approximately three times longer than wide; propodus shorter than dactylus; dactylus pointed. Pereopod 5 ( Fig. 15 F) basis with a long pappose seta on the inner margin; ischium shorter than merus; merus about three times the length of the carpus; dactylus approximately a third of the length of the propodus.

Uropod ( Fig. 15 G) with peduncle longer than sixth pleonite, seven serrate setae and rows of fine hairlike setae on the inner margin and dorsal surface; endopod slightly shorter than exopod; exopod biarticulate, basal article about a fourth of the length of the distal article; endopod uniarticulate, with seven serrate setae and a row of fine hairlike setae on the inner margin.

Ovigerous female, 2.0 mm ( Fig. 16 A). The overall appearance resembles the male. Ocular lobe only with pigment; antennal notch weak. Pereonite 2 and 3 expanded. In lateral view, carapace without antero-lateral margin. Exopods present on maxilliped 3 and pereopods 1–2.

Antenna 1 ( Fig. 16 B) similar to the male. Labium ( Fig. 16 C) with a row of fine hairlike setae on the inner margin; lobe with two cusps and a group of fine hairlike setae. Mandible ( Fig. 16 D) incisor process with two cusps; lacinia mobilis with a cusp. Maxillule ( Fig. 16 E) with ten cuspidate setae and a row of fine hairlike setae on the outer endite; palp with two unequal setae. Maxilla ( Fig. 16 F) with three endites, broad endite with 15 setae on the inner margin, medial narrow endite with nine setae and distal narrow endite with ten setae. Maxilliped 1 ( Fig. 16 G) with ischium fused to the basis; merus wider than long; carpus with five flattened bifurcated setae on the inner margin; propodus longer than wide; dactylus short, with four terminal simple setae; endite with three flattened setae, a serrate and three apical simple setae and two more simple setae on dorsal surface, with five plumose setae and two hooks on the inner margin. Maxilliped 2 ( Fig. 16 H) similar to the male, but dactylus with an apical serrulate seta. Maxilliped 3 similar to the male.

Pereopod 1 ( Fig. 17 A) similar to the male but dactylus with four terminal setae. Pereopod 2 ( Fig. 17 B) with basis shorter than the rest of the articles together; merus shorter than carpus; dactylus with seven cuspidate setae. Pereopod 3 ( Fig. 17 C) similar to the male, but basis longer than wide. Pereopod 4 ( Fig. 17 D) similar to the male, but propodus longer than dactylus. Pereopod 5 ( Fig. 17 E) merus slightly shorter than carpus; dactylus slightly shorter than propodus.

Uropod ( Fig. 17 F) peduncle with bare inner margin; exopod similar to the male; endopod with six serrate setae on the inner margin and two terminal cuspidate setae.

Etymology. The species name derives from the blended names of María del Carmen González and Carmina Jarquín, the beloved mother and sister of Jani Jarquín-González.

Remarks. About 31 species of genus Cumella , subgenus Cumewingia Bacescu, 1971 have been described globally. However Cumella (Cumewingia) carmeinae differs from these species by the female uropod having six serrate setae on the inner margin of the endopod, and the male distinguished by elevation on the dorsal surface of the pereon. For this reason we only compare the new species with Cumella from the Central and North American coasts.

On the coast of Central and North of the American continent, 18 species of Cumella (Cumewingia) are known; 17 species from the Atlantic: C. (C.) abacoensis Petrescu, 1996 (Abaco, Jamaica), C. (C.) anae Petrescu & Iliffe, 1992 (Andros Island, Bahamas), C. (C.) angelae Petrescu & Iliffe, 1992 (Andros Island, Bahamas), C. (C.) bacescui Petrescu & Iliffe, 1992 (Andros Island, Bahamas), C. (C.) biserrata Petrescu, 2002 (Man of War Cay, Belize), C. (C.) caribbeana Bacescu, 1971 (Tavernik Key, Florida), Cumella (C.) clavicauda Calman, 1911 (West Indies), Cumella (Cumewingia) garrityi Bacescu & Muradian, 1977 (Tampa Bay, Florida), C. (C.) gomoiui Bacescu & Muradian, 1977 (Havana, Cuba), C. (C.) hirsuta (Hansen, 1895) from Bermudas, C. (C.) leptopus Calman, 1911 (West Indies), C. (C.) murariui Petrescu, 2002 (Carrie Bow Cay, Belize), C. (C.) ocellata Bacescu, 1992 (Crippelgate Cave, Bermuda), C. (C.) ruetzleri Petrescu, 2002 (Carrie Bow Cay, Belize), C. (C.) serrata Calman, 1911 (West Indies), C. (C.) siankaana Donath-Hernández, 1992 (Sian Ka’ an, Quintana Roo), C. (C.) somersi Petrescu & Sterrer, 2001 (Devonshire Bay, Bermudas), and one from the Pacific, C. (C.) quintinensis Donath-Hernández, 2011 a (San Quintin Bay, Baja California).

Of these species Cumella (Cumewingia) carmeinae is closest to C. (C.) quintinensis ; however, it is distinguishable from the male C. (C.) quintinensis by C. (C.) carmeinae having a pigmented ocular lobe, whereas in C. (C.) quintinensis the ocular lobe is unpigmented; C. (C.) carmeinae has dorsolateral ridges on carapace, while in C. (C.) quintinensis the dorsolateral ridges are absent; C. (C.) carmeinae has a triangular elevation on the dorsal surface of the first three pereonites, while C. (C.) quintinensis has a bare dorsal surface; C. (C.) carmeinae has seven serrate setae on the inner margin of the peduncle of the uropod, whereas C. (C). quintinensis has ten setae; C. (C.) carmeinae has seven serrate setae on the inner margin of the endopod of the uropod, while C. (C.) quintinensis has six setae; C. (C.) carmeinae has the exopod and endopod of the uropod of similar length, whereas in C. (C.) quintinensis the exopod is shorter than endopod. With respect to the females, C. (C.) carmeinae has the peduncle of the uropod with a bare inner margin, while C. (C.) quintinensis has five to seven setae; C. (C.) carmeinae has six serrate setae on the inner margin of the endopod of the uropod, whereas C. (C.) quintinensis has two setae.

Figures

FIGURE 14. Cumella (C.) carmeinae, Paratype male, 1.7 mm, UMAR-Pera 495, Corralero Lagoon, Pinotepa Nacional, Oaxaca: A) habitus dorsal view; B) habitus lateral view; C) antenna 1; D) antenna 2; E) mandible; F) maxillule; G) maxilliped 2.

FIGURE 15. Cumella (C.) carmeinae, Paratype male, 1.7 mm, UMAR-Pera 495, Corralero Lagoon, Pinotepa Nacional, Oaxaca: A) maxilliped 3; B) pereopod 1; C) pereopod 2; D) pereopod 3; E) pereopod 4; F) pereopod 5; G) uropod.

FIGURE 16. Cumella (C.) carmeinae, Paratype ovigerous female, 2.0 mm, UMAR-Pera 495, Corralero Lagoon, Pinotepa Nacional, Oaxaca: A) habitus lateral view; B) antenna 1; C) labium; D) mandible; E) maxillule; F) maxilla; G) maxilliped 1; H) maxilliped 2.

FIGURE 17. Cumella (C.) carmeinae, Paratype ovigerous female, 2.0 mm, UMAR-Pera 495, Corralero Lagoon, Pinotepa Nacional, Oaxaca: A) pereopod 1; B) pereopod 2; C) pereopod 3; D) pereopod 4; E) pereopod 5; F) uropod.