Ctenorillo mincaensis López-Orozco, Carpio-Díaz & Campos-Filho n. sp.

Figures 1,8-10

urn:lsid:zoobank.org:act: B17E5F29-CCA8-4EC6-B345-A2EE96C30064

Material examined

COLOMBIA: Holotype ♂ (CBUDC-CRU 411), Magdalena, Santa Marta, Minca, Betoma 11°6′42.26″N 74°3′13.98″W, 20 February 2018, leg. F. Cala. Paratypes: 1 ♂, 1 ♀ (parts in micropreparations) (CBUDC-CRU 347), same data as holotype; 13 ♂♂, 27 ♀♀ (CBUDC-CRU 348), same locality and collector as holotype, 21 February 2018 .

Description

Maximum length: male 4 mm, female 6 mm. Color dark brown with typical pale muscular insertions; pereonites 1-7 median portion and epimera more pigmented; upper portion of dorsal tubercles depigmented. Dorsum covered with short triangular and elongated tubercles, arranged as follows (Figure 8A,B): vertex of cephalon with 12 tubercles in three rows, anterior row with four tubercles, middle row with two tubercles, posterior row with six tubercles; pereonite 1 with six tubercles on anterior row, 12 tubercles on middle, and three tubercles on posterior row; pereonites 2-6 with two tubercles on anterior row, ten tubercles on middle row, and three tubercles on posterior row; pereonite 7 with two tubercles on anterior row, six tubercles on middle, and three tubercles on posterior row; pleonite 3 with four small tubercles, pleonites 4 and 5 and telson with two tubercles each, more prominent on telson. Dorsal surface with short triangular scale-setae (Figure 8C). Pereonites 1-7 with one line of noduli laterales per side. Cephalon (Figure 8 D-F) with frontal shield rectangular, not protruding above vertex, and slightly bent over vertex; eyes of 16 ommatidia. Pereonite 1 epimera grooved on lateral margin, inner lobe of schisma rounded, not extending beyond posterior margin of outer lobe; pereonites 2 and 3 epimera subrectangular, 4-7 rectangular; pereonite 2 with ventral lobe subtriangular, distal margin rounded, not extending beyond posterior margin of epimera (Figure 8A,F,G). Pleonites 3-5 epimera rectangular (Figure 8H, I). Telson (Figure 8H) hourglass-shaped, proximal part broader than distal part, straight distal margin. Antennula (Figure 8J) of three articles, proximal and distal articles subequal in length, distal article bearing six to seven aesthetascs inserted apically. Antenna (Figure 8K) short and stout, not surpassing posterior margin of cephalon when extended backwards; flagellum of two articles, distal article three times as long as proximal article, bearing two lateral aesthetascs; apical organ short. Buccal pieces (Figure 9 A-E) as in Ctenorillo binomio n. sp. Pereopod 1 carpus with antennal grooming brush transverse, and distal setae apically cleft; dactylus with ungual and dactylar seta simple. Uropod (Figure 9F) protopod trapezoidal, flattened, basal part enlarged, medial margin concave; exopod tiny, inserted dorsally on distinct lobe near median margin; endopod inner margin bearing fringe of setae. Pleopods 1-5 exopods with monospiracular lungs.

Male: Pereopod 1 and 7 (Figure 10A,B) with no particular modifications. Genital papilla as in Figure 10C. Pleopod 1 (Figure 10C) exopod triangular, wider than long, outer margin slightly concave, outer and inner margins bearing many short setae; endopod more than twice as long as exopod, distal part tapering bearing short median setae. Pleopod 2 (Figure 10D) exopod triangular, outer margin concave bearing many short setae; endopod distinctly longer than exopod. Pleopod 3 and 4 exopods as in Figure 10E,F, respectively. Pleopod 5 exopod (Figure 10G) rhomboid, outer margin almost straight bearing many short setae.

Etymology The new species is named after the locality where the specimens were collected: Minca.

Remarks

In the arrangement of the dorsal tubercles of the pleon, i.e., pleonite 3 with four tubercles, pleonites 4 and 5 and telson with two tubercles, Ctenorillo mincaensis n. sp. resembles C. guinensis, from which it can easily be distinguished by the shape and arrangement of the dorsal tubercles of the cephalon and pereon, and shape of the male pleopod 1 (see Schmalfuss and Ferrara 1983). Moreover, it differs from the Neotropical species in the cephalon with 12 tubercles, pereonite 1 with 21 tubercles, pereonites 2-6 with 15 tubercles and pereonite 7 with 11 tubercles, pleonites 3-5 with 4+2+2 tubercles, male pleopod 1 exopod with outer margin concave in the middle (see C. binomio n. sp. remarks). Ctenorillo mincaensis n. sp. also differs from the previous new species in the shape, number and arrangement of the dorsal tubercles of the cephalon, pereon and pleon, and shape of the male pleopod 1 exopod.