Tylos negroi López-Orozco, Carpio-Díaz & Campos-Filho sp. nov.

urn:lsid:zoobank.org:act: DFCDBD2C-AEBD-4754-951A-1D927E81E6DC

Figs 1, 2B, 3–5

Etymology

The new species is named after Mr Hernando Gómez Molina, also known as Mr Negro, for his efforts to conserve the biodiversity of the Rosario Islands.

Material examined

Holotype COLOMBIA – Bolívar, Cartagena de Indias, Islas del Rosario, Isla Grande • ♂; Playa Libre; 10°10′52.3″ N, 75°43′54.8″ W; 5 Oct. 2017; C.M. López-Orozco, R. Borja-Arrieta and Y.M. Carpio- Díaz leg.; CUDC-CRU 127.

Paratypes COLOMBIA – Bolívar, Cartagena de Indias, Islas del Rosario, Isla Grande • 1 ♂ (parts in micropreparations); same collection data as for holotype; CUDC-CRU 128 • 2 ♀♀ (parts in micropreparations); same collection data as for holotype; CUDC-CRU 129 • many ♂♂ and ♀♀; same collection data as for holotype; CUDC-CRU 130 • 7 ♂♂, 13 ♀♀; El Silencio, Playa La Cocotera; 10°10′49.3″ N, 75°44′16.7″ W; 6 Oct. 2017; same collectors as for holotype; CUDC-CRU 131 • 8 ♂♂, 10 ♀♀; La Punta, El Terminal; 10°10′55.75″ N, 75°43′36.57″ W; same collectors as for holotype; CUDC-CRU 132 • 5 ♀♀; Playa Libre; 10°10′52.3″ N, 75°43′55.7″ W; 7 Sep. 2017; same collectors as for holotype; CUDC-CRU 133 • 1 ♀; same collection data as for holotype; CUDC-CRU 134 • 4 ♂♂, 3 ♀♀; same collection data as for holotype; 5 Oct. 2017; ICN-CR-is 262 • 1 ♂; La Punta, Hotel Cocoliso; 10°10′42.19″ N, 75°43′32.88″ W; 6 Oct. 2017; same collectors as for holotype; CUDC-CRU 135 .

Description

MEASUREMENTS. Maximum body length: male 10 mm; female 8.1 mm.

BODY. Colour yellowish with many irregular dark spots (Fig. 2B). Body outline as in Fig. 3A. Endoantennal conglobation. Dorsum covered with lanceolate scale-setae (Fig. 3B).

CEPHALON. Frontal lamina triangular (Fig. 3C–D); eyes consisting of 26–27 ommatidia.

PEREON. Pereonite 1 epimera grooved on lateral margins, schisma with inner lobe triangular, slightly surpassing outer lobe (Fig. 3E); pereonite 2 with ventral lobe triangular, shorter than outer lobe (Fig. 3E); epimera of pereonites 2–4 subtriangular, 5–7 subquadrangular (Fig. 3A).

PLEON. Epimera of pleonites 3–5 with rounded distal margin (Fig. 3F). Ventral phylacomera present on pleonites 3–5; phylacomera 5 oar-shaped, with wide distal part, medial margin oblique and slightly sinuous (Fig. 3G). Telson rectangular, posterior margin slightly folded upwards (Fig. 3F).

ANTENNULA. Composed of one article, flattened and triangular, several aesthetascs inserted on slightly rounded lobe (Fig. 3H).

ANTENNA. Short and thickset, flagellum of three articles, apical article as long as first and second articles (Fig. 4A).

MOUTH. Mandibles with strong molar process, left mandible (Fig 4B) with two penicils on molar process, two on hairy lobe and five free penicils; right mandible (Fig. 4C) with two penicils on molar process, one on hairy lobe and five free penicils. Maxillula (Fig. 4D) inner endite with three long penicils densely covered with thin setae, apical penicil longest; outer endite composed of 5+5 simple teeth plus one sensory seta, inner set bearing two teeth slightly serrate, median portion bearing three short setae. Maxilla (Fig. 4E) of two lobes, inner lobe rounded, covered with thick setae, outer lobe covered with thin setae. Maxilliped (Fig. 4F) basis with rounded outer margin, palp proximal article triangular without setae; endite rectangular, bearing five apical and two subapical penicils.

UROPOD. As in Fig 3G.

PEREOPODS. Pereopod 1 (Fig. 5A) basis with triangular latero-apical process. Pereopod 7 (Fig. 5B) propodus slightly inflated; dactylus of one claw, dactylar seta stout, not surpassing claw and bearing several small sensory setae on median to apical portion.

Male

PEREOPODS 1 AND 7. Without any sexual dimorphism (Fig. 5A–B).

PLEOPODS. Pleopod 2 exopod rectangular (Fig. 5C) with respiratory folds; endopod with distal portion slightly directed inwards, apex covered with cleft scales of 2–4 branches (Fig. 5C).

Remarks

Presently, the genus Tylos has a worldwide distribution and comprises 21 coastal species (Schmalfuss & Vergara 2000; Schmalfuss 2003). In Colombia, only T. niveus Budde-Lund, 1885 was recorded from the Caribbean region (Carpio-Díaz et al. 2016). Tylos negroi sp. nov. can be distinguished from all species of the genus by the shape of the ventral phylacomera 5. Moreover, it differs from T. niveus in the pereonite 1 epimeron having the inner lobe of the schisma surpassing the outer lobe (vs inner lobe not surpassing outer lobe) and the pereopod 7 propodus being inflated (vs not inflated).

Distribution

Presently known only from Isla Grande, Cartagena de Indias, Colombia.