Bonnierella campensis, Souza-Filho & Serejo, 2014

BONNIERELLA CAMPENSIS View in CoL SP. NOV. ( FIGS 8–10 View Figure 8 View Figure 9 View Figure 10 )

Bonnierella sp. Souza-Filho & Serejo, 2010a: 180.

Material examined

Holotype: male ( 3.7 mm), OCEANPROF I, BC-SUL, #79, Campos Basin , Rio de Janeiro, Brazil, 22°20′44.82″S, 40°01′24.72″W, 775 m, 21 November 2002, MNRJ 21218 View Materials . GoogleMaps

Paratypes: One female ( 3.3 mm) (dissected and drawn), OCEANPROF I, BC-SUL, # 79, Campos Basin , Rio de Janeiro, Brazil, 22°20′44.82″S, 40°01′24.72″W, 775 m, 26 November 2002, MNRJ 21484 View Materials GoogleMaps . One female, OCEANPROF I, BC-SUL, # 74, Campos Basin , Rio de Janeiro, Brazil, 22°28′3.24″S, 40°09′23.22″W, 750 m, 12 December 2002, MNRJ 21215 View Materials GoogleMaps . One female, OCEANPROF I, BC-NORTE, # 59, Campos Basin , Rio de Janeiro, Brazil, 21°53′59.22″S, 39°55′30,66″W, 750 m, 1 July 2003, MNRJ 21216 View Materials GoogleMaps . One female, OCEANPROF II, BC #44 , BC-NORTE , Campos Basin , Rio de Janeiro, Brazil, 22°11′27″S, 39°54′45″W, 749 m, 26 November 2002, MNRJ 21217 View Materials GoogleMaps . One male, OCEANPROF I, BC-NORTE, # 59, Campos Basin , Rio de Janeiro, Brazil, 21°53′59.22″S, 39°55′30.66″W, 750 m, 12 December 2002, MNRJ 21219 View Materials GoogleMaps . One male, OCEANPROF II, BC-NORTE , # 54, Campos Basin , Rio de Janeiro, Brazil, 21°57′23.58″S, 39°56′0.42″W, 750 m, 29 July 2003, MNRJ 21220 View Materials GoogleMaps . One male and one female, OCEANPROF II, BC- SUL, #79, Campos Basin , Rio de Janeiro, Brazil, 22°20′44.82″S, 40°01′24.72″W, 750 m, 21 June 2003, MNRJ 21221 View Materials GoogleMaps . One female, OCEANPROF I, BC-NORTE, # 60, Campos Basin , Rio de Janeiro, Brazil, 21°53′40.92″S, 39°51′42.60″W, 1050 m, 12 December 2002, MNRJ 21228 View Materials GoogleMaps . One female, OCEANPROF II, BC-SUL , # 59, Campos Basin , Rio de Janeiro, Brazil, 21°52′59.2″S, 39°55′32.2″W, 750 m, 29 June 2003, MNRJ 19049 View Materials GoogleMaps . One male and one female, OCEANPROF II, BC-SUL , # 74, Campos Basin , Rio de Janeiro, Brazil, 22°28′02.22″S 40°09′23.52″W, 750 m, 18 June 2003, MNRJ 21230 View Materials GoogleMaps . One male, OCEANPROF I, BC-SUL, # 84, Campos Basin , Rio de Janeiro, Brazil, 22°26′41.4″ S 39°58′53.28″ W, 1050 m, 20 June 2003, MNRJ 21232 View Materials GoogleMaps .

Etymology

The name campensis refers to the type locality, Campos Basin , Rio de Janeiro, Brazil .

Type locality

Campos Basin, Rio de Janeiro, Brazil.

Diagnosis

Maxilliped outer plate ovate, extending to two-thirds of palp article 2; palp 4-articulate, article 4 longer than article 3, with apical nail. Gnathopod 2 carpus triangular and short; propodus massive, 2.6 × carpus length, palm shorter than posterior margin with two processes, first process proximal and tridentate and second process truncate, separated by a U-shaped excavation followed by a concave crenulated portion, palmar corner defined by a short acute spine, facial margin with two pairs of robust setae; dactylus stout with a spine on inner margin. Uropod 1 peduncle interamal process about one-fifth of peduncle length; rami with one apical seta. Uropod 2 interamal process rudimentary; rami with one apical seta. Uropod 3 peduncle 1.4 × outer ramus length, outer ramus with four subapical tiny spines. Telson triangular with two short subapical setae.

Description

Based on holotype male ( 3.7 mm), MNRJ 21218. Head as long as pereonites 1 and 2 together; lateral cephalic lobe acute; eyes absent; anteroventral margin strongly recessed. Antennae 1 and 2 missing. Epistome acute and turned upwards. Mandible lacinia mobilis asymmetrical; palp article 2 longer than article 3, with 11 slender setae; article 3

Information from the literature and from observed material.

spatulate, with long facial and long setae. Maxilla 1 inner plate with one long seta; outer plate with ten robust setae; palp longer than outer plate, with four robust apical setae and one slender facial seta. Maxilliped inner plate rectangular, with three apical short robust setae; outer plate ovate, extending to two-thirds of palp article 2; palp 4-articulate, article 4 longer than article 3 with apical nail. Upper lip, lower lip, and maxilla 2 with basic characters for the genus.

Coxae 1–7 wider than long. Coxa 2 wider than other coxae, with seven short setae on distal margin. Coxae 5 and 6 excavate distally. Gnathopod 1 basis slender, without setae; propodus subovoid, slightly longer than carpus, palm evenly rounded and crenulated; dactylus fitting propodus. Gnathopod 2 basis, anterior margin with some sparse setae, anterodistal angle with a short process, posterior margin weakly convex; carpus triangular and short; propodus massive, 2.6 × carpus length, palm shorter than posterior margin, with two processes, first process proximal and tridentate and second process truncate, both separated by a U-shaped excavation followed by a concave crenulated portion, palmar corner defined by a short acute spine, facial margin with two pairs of robust setae; dactylus stout, with a spine on inner margin. Pereopods 3 and 4 similar in shape and length; basis long and slender, as long as merus and carpus together, both anterior and posterior margins without setae; merus with anterior margin produced; propodus longer than carpus; dactylus slightly shorter than propodus. Pereopods 5–7 missing.

Epimera 1–3 rounded. Uropods 1 and 2 reaching equally apex of uropod 3. Uropod 1 peduncle inner margin with four short robust marginal setae and one distal seta, outer margin with only one marginal seta; interamal process about one-fifth peduncle length; rami with one apical seta; inner ramus longer than outer ramus, with one short robust seta about midlength of ramus; outer ramus naked. Uropod 2, inner margin with one short robust marginal seta and one robust apical seta; interamal process rudimentary; rami with one apical seta; inner ramus longer than outer ramus, with one single short robust

seta about midlength of ramus. Uropod 3 peduncle

1.4 × length of outer ramus, with three robust marginal setae; inner ramus longer than outer ramus, naked; outer ramus with four tiny subapical spines. Telson triangular, with two short subapical setae.

Sexually dimorphic characters

Females differ from males by the more-inflated body, and in the shape of gnathopod 2, in which the propodus is 1.9 × length of the carpus, and the palm is evenly rounded, with two crenulated portions separated by a shallow oblique excavation with a small spine.

Additional description

Based on female paratype ( 3.3 mm), MNRJ 21484. Pereopod 5, basis subrectangular; merus longer than carpus, with posterior margin produced; carpus 0.37 × propodus length; propodus long; dactylus about one-quarter of propodus length. Pereopod 6, basis rectangular; merus shorter than basis, with posterior

margin produced; carpus 0.57 × propodus length;

propodus long; dactylus more than one-thrid propodus length. Pereopod 7, basis rectangular, posterior margin with three slender setae; merus longer than basis; propodus long; dactylus more than onethird propodus length.

Remarks

Bonnierella campensis sp. nov. shows some similarities with B. lapisi , such as the shape of gnathopods 1 and 2 in the male, and the basis of pereopods 5 and 6 rectangular; however, B. campensis sp. nov. has the palm of gnathopod 2 with two blunt processes, and the palmar corner is defined by a short process in the male, whereas B. lapisi has two acute processes and the palmar corner is defined by a large acute process. Also, B. campensis sp. nov. has less setose rami of uropods 1 and 2, and the outer rami of uropod 3 measures 0.7 × the peduncle length. Moreover, the female gnathopod 2 of B. campensis sp. nov. lacks an excavation on the palm.

Bonnierella campensis sp. nov. is also closely related to B. californica , in the shape of gnathopods 1 and 2, basis of pereopods 5 and 6, and uropods 1 and 3. Nevertheless, B. campensis sp. nov. has gnathopod 1 sparsely setose, with the dactylus short, both margins of the basis of pereopod 3 sparsely setose, the tip of the telson acute, and the rami of uropod 3 elongate. Additionally, B. campensis sp. nov. differs from all other species of the genus in having an elongate and ovate outer plate of the maxilliped ( Table 5).

Geographic distribution

South-western Atlantic: Campos Basin, Rio de Janeiro, Brazil.