Armadilloniscus luisi Carpio-Diaz, Taiti & Campos-Filho 2022, sp. nov.

Armadilloniscus luisi Carpio-Díaz, Taiti & Campos-Filho sp. nov.

urn:lsid:zoobank.org:act: 88600E5C-BFF9-49BA-976C-8853E33A6E58

Figs 1, 2E, 10–12

Etymology

The new species is named after Mr Luis Felipe Arrieta Zúñiga, for his interest in nature and support to Ricardo Borja-Arrieta as a biologist.

Material examined

Holotype COLOMBIA – Bolívar, Cartagena de Indias, Islas del Rosario, Isla Grande • ♂; Laguna del Silencio, El Silencio; 10°10′35.4″ N, 75°44′26″ W; 24 Aug. 2017; C.M. López-Orozco, Y.M. Carpio-Díaz and R. Borja-Arrieta leg.; CUDC-CRU 193.

Paratypes COLOMBIA – Bolívar, Cartagena de Indias, Islas del Rosario, Isla Grande • 1 ♂, 1 ♀ (parts in micropreparations); same collection data as for holotype; CUDC-CRU 194 • 10 ♂♂, 5 ♀♀; same collection data as for holotype; CUDC-CRU 195 • 1 ♀; 10°10′32.9″ N, 75°44′27.3″ W; same date and collectors as for holotype; CUDC-CRU 206 • 1 ♀; 10°10′33.5″ N, 75°44′26.9″ W; same date and collectors as for holotype; CUDC-CRU 207 • 1 ♂; 10°10′35″ N, 75°44′26.4″ W; same date and collectors as for holotype; CUDC-CRU 208 • 1 ♂; 10°10′34.8″ N, 75°44′26.6″ W; same date and collectors as for holotype; CUDC-CRU 209 • 6 ♂♂, 12 ♀♀; same collection data as for holotype; 10°10′35″ N, 75°44′16.4″ W; CUDC-CRU 210 • 14 ♂♂, 10 ♀♀; 10°10′34″ N, 75°44′26.8″ W; 25 Aug. 2017; same locality and collectors as for holotype; CUDC-CRU 211 • 3 ♂♂; La Punta, Laguna Encantada; 10°10′48.4″ N, 75°43′38.4″ W; 25 Aug. 2017; C.M. López-Orozco, Y.M. Carpio-Díaz and R. Borja- Arrieta leg.; CUDC-CRU 196 • 1 ♂; same locality as for preceding; 10°10′47.72″ N, 75°43′40.09″ W; same date and collectors as for holotype; CUDC-CRU 197 • 1 ♂, 1 ♀; same locality as for preceding; 10°10′48″ N, 75°43′39.3″ W; same date and collectors as for holotype; CUDC-CRU 198 • 1 ♀; same locality as for preceding; 10°10′47.7″ N, 75°43′39.93″ W; same date and collectors as for holotype; CUDC-CRU 199 • 2 ♂♂, 3 ♀♀; same locality as for preceding; 10°10′48.3″ N, 75°43′38.9″ W; same date and collectors as for holotype; CUDC-CRU 200 • 3 ♀♀; same locality as for preceding; 10°10′48.1″ N, 75°43′39.1″ W; same date and collectors as for holotype; CUDC-CRU 201 • 2 ♀♀; same locality as for preceding; 10°10′48.1″ N, 75°43′37.5″ W; same date and collectors as for holotype; CUDC-CRU 202 • 4 ♂♂, 4 ♀♀; same locality as for preceding; 10°10′47.72″ N, 75°43′40.09″ W; same date and collectors as for holotype; CUDC-CRU 203 • 2 ♂♂, 2 ♀♀; same locality as for preceding; 7 Sep. 2017; same date and collectors as for holotype; CUDC-CRU 204 • 3 ♂♂, 4 ♀♀; Laguna La Charca; 10°10′47.8″ N, 75°44′0.4″ W; 7 Sep. 2017; C.M. López-Orozco, Y.M. Carpio-Díaz and R. Borja-Arrieta leg.; CUDC- CRU 205.

Description

MEASUREMENTS. Maximum length: male 2.5 mm; female 3.1 mm.

BODY. Color brown with usual pale muscle spots; antennae brown with pale flagellum (Fig. 2E). Body elongated and elliptical-shaped (Fig. 10A, H). Dorsal surface bearing elongated scale-setae (Fig. 10B). Dorsum covered with broad tubercles (Fig. 10A, C–E, H): cephalon bearing seven tubercles in two rows, anterior row with four and posterior row with three; ♂ pereonites 1–3 with one row of 10 tubercles, 4–7 with one row of eight tubercles; ♀ pereonites 1, 5 and 6 with one row of 10 tubercles, 2–4 and 7 with one row of eight tubercles; ♂ pleonites 1–5 and telson with two paramedian tubercles, pleonite 2 with two broad tubercles at sides, pleonite 3 with two small additional tubercles; ♀ pleonites 1–5 and telson with two paramedian tubercles, pleonites 2 and 3 with two additional small tubercles at sides.

CEPHALON. Lateral lobes well developed and directed outwards, median lobe triangular, slightly surpassing distal margin of lateral lobes, frontal and suprantennal lines absent; eyes consisting of four ommatidia (Fig. 10C–D).

PLEON. Outline continuous with that of pereonite 7, epimera of pleonites 3–5 rectangular (Fig. 10A, E, H). Telson (Fig. 10E) triangular, lateral margins almost straight, distal part truncate and not surpassing distal margin of pleonite 5 epimera.

ANTENNULA. Composed of two articles, second article bearing a few lateral setae, distal margin bearing one flagellar seta and two aesthetascs (Fig. 10F).

ANTENNA. When extended posteriorly slightly surpassing pereonite 1, flagellum of four articles (Fig. 10G).

MOUTH. Mandibles with molar penicil of several plumose setae, left mandible with 2+1 penicils (Fig. 11A), right with 1+1 penicils (Fig. 11B). Maxillula (Fig. 11C) inner endite with two penicils; outer endite of 4+8 teeth, five of them pectinated, and one slender stalk between outer and inner set, outer distal margin bearing fringe of long thin setae. Maxilla (Fig. 11D) with lobes fused, inner middle portion with five long setae, distal margin rounded, bearing several thin and thick setae. Maxilliped (Fig. 11E) palp bearing two tufts of setae on first article, distal articles of palp fused, bearing several thin and thick setae; endite rectangular, inner margin bearing fringe of long thin setae plus four long thick setae, distal margin bilobed, bearing broad rounded penicil with long thick setae.

UROPOD. Protopod enlarged with distal margin rounded, exopod not surpassing protopod, endopod longer than exopod (Fig. 11F).

PEREOPODS. Pereopods 1–7 stout, merus to propodus bearing sparse setae on sternal margin, carpus 1 with strong distal seta bearing long sensilla, dactylus with very long ungual seta, dactylar seta elongated, apically cleft and plumose.

Male

PEREOPODS 1 AND 7. Without any sexual modifications (Fig. 12A–B).

GENITAL PAPILLA. Ventral shield triangular, papilla slightly cleft at apex, bearing small setae (Fig. 12C).

PLEOPODS. Pleopod 1 (Fig. 12D) exopod ovoid; endopod three times as long as exopod, apical portion bent outwards. Pleopod 2 (Fig. 12E) exopod subtriangular; endopod with distal article flagelliform. Exopods of pleopods 3–5 as in Fig. 12F–H.

Remarks

In the Caribbean region, four species of Armadilloniscus have been recorded: A. caraibicus from Venezuela, A. ellipticus (Harger, 1878) from the Atlantic coasts of USA and Bermuda, A. ninae Schultz, 1984 from Belize, and A. steptus Schotte & Heard, 1991 from Turks and Caicos Islands (British West Indies) (Schultz 1984; Paoletti & Stinner 1989; Taiti & Ferrara 1989; Schotte & Heard 1991). For a definition of the genus see Arcangeli (1957), Vandel (1962), Taiti & Ferrara (1989), and Schmidt (2002).

Armadilloniscus luisi Carpio-Díaz, Taiti & Campos-Filho sp. nov. is readily distinguished from all the other species of the genus in the number and arrangement of the dorsal tubercles on the cephalon, pereon and pleon. Moreover, it can be distinguished from the other four Caribbean species in having two broad tubercles on pleonite 2 (vs small in A. caraibicus and A. steptus, absent in A. ninae), the cephalon with the median lobe triangular (vs rounded in A. caraibicus) and lateral lobes subquadrangular (vs subtriangular in A. ninae and A. steptus), eyes composed of four ommatidia (vs 4–5 in A. caraibicus, 6 in A. ellipticus and 5 in A. ninae), telson with distal margin truncate (vs rounded in A. caraibicus and A. ellipticus, triangular in A. ninae), and ♂ pleopod 1 exopod ovoid (vs subtriangular in A. caraibicus, A. ellipticus and A. ninae, almost rounded in A. steptus) (Paoletti & Stinner 1989; Schultz 1984; Schotte & Heard 1991; Garthwaite et al. 1992; Schmidt 2002).

Distribution

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