Yamuy constratus Arriaga-Varela, Tomaszewska, Szawaryn, Robertson, Seidel, Ślipiński & Fikáček, 2023, SP. NOV.

YAMUY CONSTRATUS ARRIAGA- VARELA, TOMASZEWSKA & SZAWARYN SP. NOV.

(FIGS 12A, B, 13B–F, 14A–C, 15A–H, 19A–B, 20A)

Zoobank registration: urn: lsid: zoobank. org:act: 5CD938AC-7821-46A6-ADB3-C64CC573D46F:

Type material: Holotype, male, PUERTO RICO: Portorico Mor. [green label]/ 55669/ Zool. Mus. Berlin/ frontalis m. [handwriting] (MNB). Paratypes: PUERTO RICO: Portorico Moritz Nr. 55 669 [green label]/ Zool. Mus. Berlin (one female, MNB); Naguabo, El Yunque Nat. Forest, S. part, 4.9 km N of Río Blanco, 18°15.8′N, 65°47.3′W; 495 m, 24.vi.-2.vii.2016; Fikáček & Seidel lgt. PR11// flight intercept trap at the margin of the rainforest in an area with many flowering Etlingera elatior plants (one female, totally dissected, NMPC); Puerto Rico, El Verde Res. Sta., 250 m, Carib Nat. For., Rio Grande, 19 July 1994, slime mold fruit. body, M. A. Ivie (one female, MTEC; one female, MIZ); VENEZUELA: Caracas Moritz Nr. 55 670 [green label]/ Zool. Mus. Berlin (one female, MNB); same and 55670/ luridellus m. [handwriting]/ Zool. Mus. Berlin (one, MNB).

Diagnosis: Yamuyconstratus canbeeasilydistinguished from Y. marginatus by having uniformly coloured elytra (Fig. 12A, B), the lateral margins of the pronotum narrowly bordered by a simple, thin bordering line and with short internal subparallel carinae at base (Fig. 15C) (in Y. marginatus internal carina demarcating a wide area is present throughout the length of pronotum), the anterior margin of metaventrite and abdominal ventrite 1 with irregularly crenulate bordering line, without longitudinal carinae (Fig. 15G, H) (in Y. marginatus anterior margin of metaventrite and abdominal ventrite 1 with short postcoxal longitudinal carinae beyond each coxal cavity) and by peculiar punctation on dorsal body surface: apart from long setae present in both species, a tiny short hairs are growing from conspicuous tubercles set in round foveolate punctae in Y. constratus (Fig. 15C, F), while in Y. marginatus short hairs are growing from simple punctae.

Description: Body: length 0.9 mm, 1.3 times as long as wide, 2.0 times as long as high, short oval and moderately convex. Coloration uniformly brown to pale-yellow (Fig. 12A, B).

Antenna nearly 0.4 of length of body (Fig. 15A); antennomeres 1–6 as long as wide; antennomeres 7–9 subquadrate. Apical labial palpomere short and acuminate (Fig. 15A), 1.8 times as long as wide.

Pronotum 2.0 times as wide as long, 1.3 times wider at widest part than on front angles (Fig. 15C). Anterior margin with bordering line vanishing medially. Lateral edges bordered with simple thin bordering line, and with internal lateral carina reaching at most about basal third length of pronotum. Pronotal disc not concave near lateral margins. Base of pronotum not bordered. Posterolateral corners without indentation. Prosternal process with apex about 0.3 of width of procoxal cavity (Fig. 15D), narrowest near half-length, distinctly widened apically, lateral carinae reaching beyond half-length of prosternum, with area between carinae distinctly depressed.

Elytra (Figs 12A, 15F) 0.6 mm long, about as long a wide, 2.5 times as long and 1.4 times as wide as pronotum; lateral margins visible from above (Fig. 12A). Mesoventral process about as wide as mesocoxal diameter (Figs 13D, 15G). Metaventrite with a few fine setiferous punctures mainly on anterior half; anterior margin without longitudinal carinae (Figs 13D, 15G).

Legs. Meso- and metatrochanters weakly flattened, not produced posteriorly (Figs 13D, 15D, G).

Abdomen. Ventrite 1 with anterior margin distinctly, simply margined, without postcoxal lines (Fig. 15H); longitudinal carina below each metacoxa absent. Male genital segment as in Fig. 14A.

Male genitalia (Fig. 14B). Aedeagus with penis short and stout, sclerotized, narrow at base, weakly widening towards ramificate apex. Tegmen sclerotized short ring, with long ramificate projection extending anteriorly beyond apex of penis; tegminal strut short.

Female genitalia (Fig. 14C). Ovipositor weakly sclerotized. Spermatheca comparatively large, irregular – ‘infundibuliform’, submembranous; sperm duct short; accessory gland small membranous, of irregular-cordate shape. Proctiger large, weakly sclerotized.

Etymology: From the Latin, constratus, flat, plane, referring to the mostly flat lateral areas of the pronotum, having only short lateral carinae at base.

Biology: One of the studied specimens was collected from a slime mold fruiting body at an elevation of around 250 m, while another specimen was collected using a flight intercept trap installed at the margin of a rainforest at elevation of 495 m (Fig. 19A, B).

Distribution: Puerto Rico, Venezuela (Fig. 20A).