Cleantioides tamandarensis, Negromonte & Lucatelli & Paiva & Souza-Filho, 2022

Negromonte, Aurinete Oliveira, Lucatelli, Debora, Paiva, Ricardo José de Carvalho & Souza-Filho, Jesser F., 2022, Three new species of the genus Cleantioides Kensley and Kaufman, 1978 (Isopoda: Valvifera) from Brazil, with new record of the family Holognathidae from Brazil, Journal of Natural History 56 (13 - 16), pp. 923-941 : 935-939

Cleantioides tamandarensis sp. nov.

( Figures 9–12 )

Type material

Holotype. Female, 3.1 mm, Tamandaré Bay , Pernambuco, (8.77°S, 35.09°W), #2 light trap, 3 October 2013, Pernambuco, MOUFPE 20064 .

Paratypes. 1 male, 2 females, same as holotype, #1 light trap, 21 July 2012, MOUFPE 20065 .

Diagnosis. Body 4.0–4.2x longer than wide. Antenna 2 article 2 with a ventromesial process with bilobed apex much longer than dorsalmesial process. Posterior margin of coxae 5–7, epimeral plates 1–4 and ventral margin of pleotelson with plumose setae. Pereopod 4 propodus with robust simple setae; dactylus without unguis and with rounded tip. Pleotelson dorsally almost straight, 0.33x total body length, 1.75x longer than wide; dorsum of distal half with oblique circular plane inclined ~35° from horizontal, occupying 0.5 of pleotelson length, with dorsal sparse short setae, well defined by a sharp marginal ridge extending all around, dorsally with 2 submedian poorly developed rounded-edged lobes, followed by 2 submedian inconspicuous dorsal humps (best seen in lateral view), distal margin rounded or slightly sinuous. Uropodal peduncle and endopod with inner margin and surface bearing plumose setae.

Description. Based on holotype.

Body 4.2x longer than wide, dorsal poorly rugose. Head 1.75x wider than long, with anteromesial excavated depression; posterior margin convex. Eyes dorsolateral, reniform. Coxae 5–7 and epimeral plates 1–4 with plumose setae on posterior margin. Pleotelson 0.33x of total body length, 1.75x longer than wide, ventral margin with plumose setae. Pleonite 1 free and articulated, barely visible under pereonite 7. Pleonites 2–3 well defined but not articulated, pleonite 4 fused mesially only, lateral margin hidden under pleonite 3; remaining pleotelson parallel-sided and with semicircular apex; dorsum of distal half with oblique circular plane inclined ~35° from horizontal, occupying 0.5 of pleotelson length, with dorsal sparse short setae, well defined by a sharp marginal ridge extending all around, dorsally with 2 submedian poorly developed rounded-edged lobes, followed by 2 submedian inconspicuous dorsal humps (best seen in lateral view), distal margin rounded.

Antenna 1 reaching ~1/4 of article 3 antenna 2 peduncle; peduncle article 1 1.2x wider than long; flagellum 1/3 length of article 3 of peduncle, with 8 apical aesthetascs. Antenna 2 0.27x length of body, article 2 with a ventromesial process with bilobed apex and much longer than dorsalmesial process; flagellum of article 1 0.25x antenna total length, with a tuft of setae distally. Mandible molar columnar and triturative; right incisor with 3 teeth, right lacinia mobilis with 3 teeth, left 5 teeth. Maxilla 1 outer plate without a row of setules, distal margin with 6 robust setae, inner plate shorter than outer plate, bearing 2 robust and plumose setae distally. Maxilla 2 outer plate with an oblique row of 11 plumose setae; middle and inner plate with a row of 7 setae. Maxillipedal endite with 2 robust setae on lateral margin, 1 plumose seta mesially and 6 on transverse apex; palp 0.37x wider than length, 5 articles visible but suture between 2 and 3 not articulated; articles 2–5 setose mesially; article 3 mesiodistally lobed; article 5 wider than long, 0.25x length of article 4; epipod tapering and rounded distally.

Pereopod 1 basis with setose dorsal margin (plumose setae);ventral margin of merus with 3 setae,carpus and propodus with dense robust setation; propodus almost 2x longer than wide. Pereopods 2 and 3 similar. Pereopod 2 basis with a tuft of plumose setae on both proximal dorsal and ventral margins; ischium longer than merus, distal margin widened, without setae; merus with dorsodistal angle slightly produced, bearing a tuft of robust setae; carpus shorter than propodus, with a line of robust setae on ventral margin; propodus 2.7x longer than wide; dactylus well developed, curved and bearing a distal unguis, a subdistal robust seta and a tuft of slender setae.Pereopod 3 basis without a tuft of plumose setae on both proximal dorsal and ventral margins;ischium longer than merus,distal margin widened,dorsal margin with 4 setae; merus with dorsodistal angle slightly produced, bearing a tuft of robust setae; carpus shorter than propodus, with a line of robust setae on ventral margin; propodus 2.8x longer than wide; dactylus well developed, curved and bearing a distal unguis, a subdistal robust seta and a tuft of slender setae. Pereopod 4 0.45x length of pereopod 3, ischium with 4 robust setae; merus, carpus and propodus with posterodistal U-shaped rows of 8, 17, and 10 robust setae, respectively; propodus with robust simple setae; dactylus without unguis and with rounded tip. Pereopod 5 longer than 4, basis to propodus with a row of long plumose setae on dorsal margin; merus, carpus and propodus with a row of robust setae; ventral margin of dactylus strongly hooked. Pereopods 6 and 7 more elongate than 5, basis to propodus with a row of long plumose setae on dorsal margin; propodus of pereopod 7 3.1x longer than wide. Oostegites present on pereopods 1–5. Pleopod 1 peduncle with 3 robust setae; inner ramus longer than outer ramus (1.2x). Pleopod 2 peduncle with 3 robust setae; inner ramus longer than outer ramus (1.3x), outer ramus subrectangular with rounded apex,outer margin smooth. Uropodal peduncle 3.2x longer than wide; inner margin of peduncle, endopod and surface with plumose setae; endopod almost as wide as long, outer distal margin rounded and inner distal margin subacute.

Etymology. The specific epithet tamandarensis refers to the city of Tamandaré (State of Pernambuco, Brazil), the type locality of this species.

Remarks. Cleantioides tamandarensis sp. nov. closely resembles C. planicauda and C. vonprahli in the shape of the pleotelson. However, the new species is distinguished from C. vonprahli by the palp of maxilliped with 5 articles (vs 4), with tufts of plumose setae on coxae 5–7, epimeral plates and lateral margin of pleotelson (vs without any plumose setae), and 6 longitudinal dorsal pigmented lines on pereion (vs 4). Cleantoides tamandarensis sp. nov. differs from C. planicauda (description and illustration in Brusca and Iverson 1985) in having body 4.2x as long as wide (vs 5.2 or more), and pleotelson with 2 submedian poorly developed rounded-edged lobes dorsally, followed by 2 submedian inconspicuous dorsal humps (best seen in lateral view) (vs pleotelson dorsally unadorned).

Figures

Figure 9. Cleantioides tamandaresis sp. nov. Holotype, female (3.1 mm), Tamandaré Bay, Pernambuco, (8.77°S, 35.09°W), Pernambuco, MOUFPE 20064. Abbreviation: Hb, habitus. Scale bars: 0.5 mm.

Figure 10. Cleantioides tamandaresis sp. nov. Holotype, female (3.1 mm), Tamandaré Bay, Pernambuco, (8.77°S, 35.09°W), Pernambuco, MOUFPE 20064. Abbraviations: A, antenna; Md, mandible; Mx, maxilla; Mxp, maxiliped. Scale bars: 0.1 mm.

Figure 11. Cleantioides tamandaresis sp. nov. Holotype, female (3.1 mm), Tamandaré Bay, Pernambuco, (8.77°S, 35.09°W), Pernambuco, MOUFPE 20064. Abbreviation: P, pereopod. Scale bars: 0.1 mm.

Figure 12. Cleantioides tamandaresis sp. nov. Holotype, female (3.1 mm), Tamandaré Bay, Pernambuco, (8.77°S, 35.09°W), Pernambuco, MOUFPE 20064. Abbreviations: P, pereopod; PP, penile papillae; Ur uropod. Scale bars: 0.1 mm.