Cyclaspis boquillensis, 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 : 212-217

Cyclaspis boquillensis sp. nov.

Figs 6–9

Type material. Holotype male, UMAR-Pera 490, La Boquilla Bay, Puerto Angel, Oaxaca, 3 m, sandy sediment, 17 November 2007. Paratypes, 7 males (one dissected), 1 ovigerous female (dissected), 7 females, 1 juvenile, UMAR- Pera 491, same locality and date.

Diagnosis. In both sexes carapace with three teeth on the middorsal line. Male. Pereopod 1 with three cuspidate setae on the middorsal surface of the basis; endopod of the uropod with nine serrate setae on the inner margin. Female. Endopod of the uropod with seven serrate setae on the inner margin; marsupium with calcified protective layer.

Description. Adult male, 6 mm ( Figs 6 A–B). Body calcareous, opaque and with dark brown pigment. Carapace with three teeth on the middorsal line; ocular lobe with at least three lenses and pigment around the lenses, reaching beyond the tip of the pseudorostral lobes; antennal notch subacute; siphons short. In lateral view all pleonites have a peg. Exopods present in maxilliped 3 and pereopod 1.

Antenna 1 ( Fig. 6 C) first basal article longer than the next two articles together; third article two times longer than broad; main flagellum biarticulate; accessory flagellum reduced. Antenna 2 ( Fig. 6 D) with five articles, fifth article longer than all articles; flagellum with short articles and reaches to the end of the peduncle of the uropod. Mandible ( Fig. 6 E) incisor process with four cusps, lacina mobilis with three cusps. Maxilliped 3 ( Fig. 6 F) basis expansion has an apical tooth and 13 plumose setae; ischium longer than carpus; merus expanding into the junction with propodus; expansion of the merus with teeth and a plumo-annulate seta; propodus broader than dactylus.

Pereopod 1 ( Fig. 7 A) basis longer than rest of the articles together, with three cuspidate setae on dorsal surface and fine hairlike setae on medial inner margin; ischium approximately half the length of the merus; merus with scales on dorsal surface; dactylus with nine setae. Pereopod 2 ( Fig. 7 B) basis with scales on dorsal surface; dactylus with seven cuspidate setae. Pereopod 3 ( Fig. 7 C) basis of the same length as the rest of the articles together, with three plumo-annulate setae on the inner margin; propodus four times longer than wide; dactylus with pointed tip. Pereopod 4 ( Fig. 7 D) basis shorter than the rest of the articles together; merus shorter than carpus; carpus about two times the length of the propodus; dactylus with pointed tip. Pereopod 5 ( Fig. 7 E) basis shorter than the rest of the articles together; carpus approximately two times the length of the propodus, with three distal plumo-annulate setae on the outer margin; dactylus with pointed tip. Pleopod 2 ( Fig. 7 F) with peduncle longer than rami; endopod uniarticulate; exopod biarticulate.

Uropod ( Fig. 7 G) peduncle and exopod of the same length; exopod longer than endopod and biarticulate, basal article a third of the length of the distal article, distal article with eight plumose setae on the inner margin and three distal cuspidate setae; endopod uniarticulate, with two small plumose setae, eight serrate setae on the inner margin and an apical cuspidate seta.

Ovigerous female, 5.3 mm ( Fig. 8 A). The overall appearance resembles the male. Frontal lobe approximately a third of the length of the carapace. Second pereonite the longest of all pereonites; lateral expansion of the second pereonite involves the first pereonite; marsupium with a slightly calcified and rough protective layer.

Antenna 1 ( Fig. 8 B) similar to the male, with third article three times longer than broad. Mandible ( Fig. 13 C) incisor process with three cusps, molar with fine hairlike setae on dorsal surface, lacina mobilis absent. Maxillule ( Fig. 8 D) with two endites, outer endite with ten cuspidate setae and four groups of fine hairlike setae; inner endite with four apical setae. Maxilla ( Fig. 8 E) with 28 setae on the inner margin of the broad endite, many simple setae on medial narrow endite and a plumose seta on narrow endite. Maxilliped 1 ( Fig. 8 F) merus broader than long; carpus with 16 simple setae and few fine hairlike setae on dorsal surface, with seven bifurcate flattened setae on the inner margin; propodus about three times the length of the dactylus; dactylus with two apical cuspidate setae. Maxilliped 2 ( Fig. 8 G) basis with three distal pappose setae and a simple seta; ischium shorter than merus, bare; merus and carpus of the same proportions; propodus longer and broader than dactylus. Maxilliped 3 ( Fig. 9 A) basis broader than male, expansion of the basis with 17 plumose setae.

Pereopod 1 ( Fig. 9 B) basis shorter than the rest of the articles together, with three cuspidate setae on the inner margin, two of them distally; propodus longer than dactylus; dactylus with 11 setae. Pereopod 2 ( Fig. 9 C) similar to the male, but basis with dorsal surface bare. Pereopod 3 ( Fig. 9 D) similar to the male, but basis longer than the rest of the articles together and with three setae on the outer margin. Pereopod 4 ( Fig. 9 E) generally all articles similar to the male, but with scales on dorsal surface of the basis. Pereopod 5 ( Fig. 9 F) similar to the male but carpus with two setae on the outer margin.

Uropod ( Fig. 9 G) peduncle shorter than rami, with at least 28 small conical setae on the inner margin; exopod with a serrate seta on the inner margin and two apical setae; endopod with seven serrate setae and a row of conical setae on the inner margin.

Etymology. The species name refers to the locality where the specimens were collected, Boquilla Bay.

Remarks. The overall appearance of this new species resembles that of Cyclaspis breedyae Petrescu & Heard, 2004 (Gulf of Nicoya, Costa Rica), but the female of Cyclaspis boquillensis has three teeth on the middorsal surface of the carapace, while C. breedyae has four teeth; C. boquillensis has the first basal article of the antenna 1 with a row of fine hairlike setae on the outer margin, whereas C. breedyae has a bare outer margin; C. boquillensis has the basis expansion of the maxilliped 3 with seven plumose setae on the outer margin, while C. breedyae has a bare outer margin; C. boquillensis has a strong tooth on the inner margin of the ischium of the maxilliped 3, whereas C. breedyae has a bare inner margin; C. breedyae has the basis of the maxilliped 3 with a serrate inner margin, while C. boquillensis has a bare inner margin; C. boquillensis has the basis of the pereopod 1 with three cuspidate setae on the inner margin, whereas C. breedyae has a bare outer margin; C. boquillensis has the peduncle of the uropod with 28 small conical setae on the inner margin, while C. breedyae has 14 cuspidate setae; C. boquillensis has the endopod of the uropod with seven serrate setae on the inner margin, whereas C. breedyae only has four setulate setae. Additionally, the females of C. boquillensis differ from females of Cyclaspis hyalinus and the other Cyclaspis recognised from the west coast of America by having a calcified protective layer on the marsupium ( Table 2 ).

Figures

FIGURE 6. Cyclaspis boquillensis, Paratype male, 6 mm, UMAR-Pera 491, La Boquilla Bay, Puerto Ángel, Oaxaca: A) habitus lateral view; B) habitus dorsal view; C) antenna 1; D) antenna 2; E) mandible; F) maxilliped 3.

FIGURE 7. Cyclaspis boquillensis, Paratype male, 6 mm, UMAR-Pera 491, La Boquilla Bay, Puerto Ángel, Oaxaca: A) pereopod 1; B) pereopod 2; C) pereopod 3; D) pereopod 4; E) pereopod 5; F) pleopod 2; G) uropod.

FIGURE 8. Cyclaspis boquillensis, Paratype ovigerous female, 5.3 m, UMAR-Pera 491, La Boquilla Bay, Puerto Ángel, Oaxaca: A) habitus lateral view; B) antenna 1; C) mandible; D) maxillule; E) maxilla; F) maxilliped 1; G) maxilliped 2.

FIGURE 9. Cyclaspis boquillensis, Paratype ovigerous female, 5.3 m, UMAR-Pera 491, La Boquilla Bay, Puerto Ángel, Oaxaca: A) maxilliped 3; B) pereopod 1; C) pereopod 2; D) pereopod 3; E) pereopod 4; F) pereopod 5; G) uropod.

FIGURE 13. Cyclaspis hyalinus, Paratype male, 2.1 mm, UMAR-Pera 489, Copalita mouth river, Huatulco, Oaxaca: A) pereopod 1; B) pereopod 2; C) pereopod 3; D) pereopod 4; E) pereopod 5; F) pleopod 2.