Ctenorillo orientalis Carpio-Díaz, Taiti & López-Orozco, 2023

Carpio-Díaz, Yesenia M., López-Orozco, Carlos Mario, Borja-Arrieta, Ricardo, Gutierrez-Estrada, Miguel, Campos-Filho, Ivanklin Soares, Sfenthourakis, Spyros, Taiti, Stefano, Moreno, Jhon Cesar Neita, Bermúdez, Adriana, Navas-S., Gabriel R. & Bichuette, Maria Elina, 2023, The genus Ctenorillo Verhoeff, 1942 (Oniscidea, Armadillidae) from Colombia: new records, new species, and conservation comments, Tropical Zoology (trop. Zool.) 36 (3 - 4), pp. 53-84 : 69-72

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).

Figures

Figure 10. Ctenorillo mincaensis López-Orozco, Carpio-Díaz & Campos-Filho n. sp., ♂:A, pereopod 1; B, pereopod 7; C, pleopod 1 and genital papilla; D, pleopod 2; E, pleopod 3 exopod; F, pleopod 4 exopod; G, pleopod 5 exopod.

Figure 11. Ctenorillo orientalis Carpio-Díaz, Taiti & López-Orozco n. sp., ♀: A, habitus, lateral view; B, dorsal tubercles scheme; C, dorsal scale-seta; D, cephalon, dorsal view; E, cephalon, posterior view; F, cephalon and pereonites 1-3, frontal view; G, pereonites 1 and 2 epimera, ventral view; H, pleonites 3-5, telson, and uropods, dorsal view; I, pereonite 7, pleonites 3-5, telson, and uropods, ventral view; J, antennula; K, antenna.

Figure 12. Ctenorillo orientalis Carpio-Díaz, Taiti & López-Orozco n. sp., ♀: A, left mandible; B, right mandible; C, maxillula; D, maxilla; E, maxilliped; F, uropod.

Figure 13. Ctenorillo orientalis Carpio-Díaz, Taiti & López-Orozco n. sp., ♀: A, pereopod 1; B, pereopod 7; C, pleopod 1 exopod; D, pleopod 2 exopod; E, pleopod 3 exopod; F, pleopod 4 exopod; G, pleopod 5 exopod.