Ctenorillo orientalis Carpio-Díaz, Taiti & López-Orozco n. sp.

Figures 1,11-13

urn:lsid:zoobank.org:act: 69228A54-95F1-4E38-9698-4C3F5705ECEC

Material examined

COLOMBIA: Holotype ♀ (CUDC-CRU 57), Cesar, Manaure, San José de Oriente, Serranía de Perijá, 10°17’40.4”N 72°55’52.1”W, 13 August 2015, leg. C.M. López-Orozco and Y. Herrera-Medina. Paratypes: 1 ♀ (parts in micropreparations) (CUDC-CRU 355), 5 ♀♀ (CUDC-CRU 356), same data as holotype .

Description

Maximum length: 4.5 mm. Color brown; antennae and pereopods strongly pigmented; pereonites 1-7 and pleon with median and paramedian portions depigmented; pereonite 1 epimera anterior and posterior corners depigmented; pereonites 2-7 epimera lateral margins with large depigmented spot. Dorsum covered with short triangular tubercles, arranged as follows (Figure 11A,B): vertex of cephalon with 16 tubercles in three rows, anterior row with six tubercles, middle row with four tubercles, posterior row with six tubercles; pereonite 1 with four tubercles on anterior row, 14 tubercles on middle row, and seven tubercles on posterior row; pereonites 2-7 with eight tubercles on anterior row, nine tubercles on posterior row; pleonites 3 and 4 with four tubercles, pleonite 5 and telson with two tubercles each. Dorsal surface with semi-circular scale-setae (Figure 11C). Pereonites 1-7 epimera with one line of noduli laterales per side inserted on antero-lateral surface of second outer tubercle. Cephalon (Figure 11 D-F) with frontal shield rectangular, slightly protruding above vertex, and slightly bent over vertex; eyes of 17-19 ommatidia. Pereonite 1 epimera grooved on lateral margins, for about one quarter of length, inner lobe of schisma rounded, not extending beyond posterior margin of outer lobe; pereonites 2 epimera subtriangular, 3-7 rectangular; pereonite 2 with ventral lobe subrectangular, distal margin rounded, not extending beyond posterior margin of epimera (Figure 11A,F,G). Pleonites 3-5 epimera rectangular (Figure 11H,I). Telson (Figure 11H) hourglass-shaped, proximal part broader than distal part, slightly convex distal margin. Antennula (Figure 11J) of three articles, proximal and distal articles subequal in length, distal article bearing five subapical aesthetascs. Antenna (Figure 11K) short and stout, slightly surpassing posterior margin of cephalon when extended backwards; flagellum of two articles, distal article three times as long as proximal article, and bearing two lateral aesthetascs; apical organ short. Buccal pieces (Figure 12 A-E) as in Ctenorillo binomio n. sp. Pereopods 1-7 (Figure 13A,B) with no particular modifications; pereopod 1 carpus with antennal grooming brush transverse, distal setae apically cleft; dactylus with ungual and dactylar seta simple. Uropod (Figure 12F) protopod trapezoidal, flattened, basal part enlarged, medial margin slightly concave; exopod short, inserted dorsally below distinct lobe near medial margin; endopod inner and outer margins bearing fringe of setae. Pleopods 1-5 exopods with monospiracular lungs. Pleopod 1 exopod (Figure 13C) twice as wide as long, distal margin almost straight. Pleopod 2 exopod (Figure 13D) subtriangular, outer margin concave bearing many short setae. Pleopod 3 and 4 exopods (Figure 10E,F) subrectangular, distal margin slightly concave and bearing many short setae. Pleopod 5 exopod (Figure 13G) rhomboid, outer margin almost straight bearing many short setae.

Etymology

The new species name refers to the geographical location of the locality where the specimens were collected: Cordillera Oriental de Colombia.

Remarks

Despite the absence of male specimens, Ctenorillo orientalis n. sp. exhibits a unique arrangement of the dorsal tubercles of the cephalon and pereon. In the arrangement of the dorsal tubercles of the pleon, the new species is similar to C. gabunensis, C. tuberosus and C. binomio n. sp.. It can de distinguished by the shape, number and arrangement of the dorsal tubercles of cephalon and pereon (see Schmalfuss and Ferrara 1983; Campos-Filho et al. 2017).