Ctenorillo humboldti Carpio-Díaz, López-Orozco & Campos-Filho, 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 : 61-63

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

Figures 1,5-7

urn:lsid:zoobank.org:act:C98ACE2C-8B5D-4270-8C55-CFB1DFA75983

Material examined

COLOMBIA: Holotype ♂ ( IAvH-I- 508 ), Risaralda, Pereira, Vereda Los Cerritos - Hacienda Alejandría , 4°51’27”N 75°52’49”W, 1000 m a.s.l., November 2004, leg. M. Bustamante. Paratype: 1 ♂ (parts in micropreparations) ( IAvH-I- 508 ), same data as holotype .

Description

Maximum length: 4 mm. Color brown; upper portion of tubercles, anterior corner of pereonite 1 epimera, pereonites 2-7 and pleonites 3-5 epimera depigmented. Dorsum covered with triangular tubercles, arranged as follows ( Figure 5A,B ): vertex of cephalon with eight tubercles in three rows, anterior and posterior rows with two tubercles each, middle row with four tubercles; pereonite 1 with four tubercles on anterior row, six tubercles on middle, and two tubercles on posterior row; pereonites 2-7 with six tubercles on anterior row, and two tubercles on posterior row; pleonites 3-5 without tubercles; telson with two tubercles. Dorsal surface with short triangular scale-setae ( Figure 5C ). Pereonites 1-7 epimera with one line of noduli laterales per side inserted on postero-lateral surface of second outer tubercle. Cephalon ( Figure 5 D-F) with frontal shield rectangular, slightly protruding above vertex, and slightly bent over vertex; eyes of 18 ommatidia. Pereonite 1 epimera grooved on lateral margins for about two thirds of length, inner lobe of schisma rounded, not extending beyond posterior margin of outer lobe; pereonites 2-7 epimera rectangular, pereonite 2 with ventral lobe subtriangular, distal margin rounded, not extending beyond posterior margin of epimera ( Figure 5A ,F-H). Pleonites 3-5 epimera rectangular ( Figure 5I,J ). Telson ( Figure 5I ) hourglass-shaped, proximal part broader than distal part, straight distal margin. Antennula ( Figure 5K ) of three articles, proximal and distal articles subequal in length, distal article bearing seven aesthetascs. Antenna ( Figure 5L ) short and stout, slightly surpassing posterior margin of cephalon when extended backwards; flagellum of two articles, distal article about twice as long as proximal article, bearing two lateral aesthetascs; apical organ short. Buccal pieces ( Figure 6 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 6F ) protopod trapezoidal, flattened, basal part enlarged, medial margin concave; exopod short, inserted dorsally below distinct lobe near median margin; endopod inner and outer margins bearing fringe of setae. Pleopods 1-5 exopods with monospiracular lungs.

Male: Pereopod 1 and 7 ( Figure 7A,B ) with no particular modifications. Genital papilla as in Figure 7C . Pleopod 1 ( Figure 7D ) exopod triangular, as long as wide, outer margin slightly concave, inner and outer margins bearing many short setae; endopod about three times as long as exopod, distal part tapering. Pleopod 2 ( Figure 7E ) exopod triangular, outer margin concave bearing many short setae; endopod flagelliform longer than exopod. Pleopod 3 and 4 exopods as in Figure 7F and G , respectively. Pleopod 5 exopod ( Figure 7H ) rhomboid, outer margin slightly sinuous bearing many short setae.

Etymology

The new species is named after the German naturalist and explorer Friedrich Wilhelm Heinrich Alexander von Humboldt, also known as Baron von Humboldt, famous for his biogeographic expeditions to South America.

Remarks

In the absence of the dorsal tubercles of the pleon, Ctenorillo humboldti n. sp. is similar to C. strinatii , from which it can de distinguished by the shape, number and arrangement of the dorsal tubercles of the cephalon and pereon, and shape of the male pleopod 1 exopod (see Schmalfuss and Ferrara 1983). Moreover, it differs from the Neotropical species in the cephalon with eight tubercles, pereonite 1 with 12 tubercles, pereonites 2-7 with eight tubercles, pleonites 3-5 smooth, antennula with seven aesthestascs, uropod exopod short inserted below the dorsal median lobe, and the male pleopod 1 exopod with outer margin concave (see previous remarks). Ctenorillo humboldti n. sp. also differs from C. binomio n. sp., in the number and arrangement of the dorsal tubercles of the cephalon and pereon, pleonites 3-5 smooth and shape of the male pleopod 1 exopod.

Figures

Figure 5. Ctenorillo humboldti Carpio-Díaz, López-Orozco & Campos-Filho 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 and 2, frontal view; G, pereonites 1 and 2 epimera, ventral view; H, pereonites 1-7 epimera, ventral view; I, pereonite 7, pleon, telson, and uropods, dorsal view; J, pereonite 7, pleonites 3-5, telson and uropods, ventral view; K, antennula; L, antenna.

Figure 6. Ctenorillo humboldti Carpio-Díaz, López-Orozco & Campos-Filho n. sp., ♂: A, left mandible; B, right mandible; C, maxillula; D, maxilla; E, maxilliped; F, uropod.

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