Yamuy marginatus Arriaga-Varela, Tomaszewska, Szawaryn, Robertson, Seidel, Ślipiński & Fikáček, 2023, SP. NOV.
Creators: name: Arriaga-Varela, Emmanuel
name: Tomaszewska, Wioletta
name: Szawaryn, Karol
name: Robertson, James
name: Seidel, Matthias
name: Ślipiński, Adam
name: Fikáček, Martin
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Mycetaeidae
Yamuy
Yamuy marginatus

description: YAMUY MARGINATUS ARRIAGA- VARELA,
TOMASZEWSKA & SZAWARYN SP. NOV.
(FIGS 12C, D, 13A, 14D–F, 16A–F, 20A)
Zoobank registration: urn: lsid: zoobank. org:act: 2D30BBFE-4F4D-4C1D-9C97-C0BBB4F6B2F6
Type material: Holotype, male, PUERTO RICO: Orocovis Bosque Estatal Toro Negro, sector Doña Juana, 5.6 km N of Villalba 18°10.6′N, 66°29.7′W; 810 m, 29.vi.2016; Deler, Fikáček & Seidel lgt., PR18// sifting of small accumulations of leaf litter and rotten palm leaves and fruit in sparse montane forest at the stream bank (NMPC). Paratypes: PUERTO RICO: San German, Bosque Estatal Maricao, 8.6 km N of Sabana Grande 18°8.0′N, 66°59.5′W; 820 m, 28.vi.2016; Fikáček & Seidel lgt., PR16 (one, MIZ); Puerto Rico: Jayuya, Toro Negro at 18°10.335′N, 66°35.504′W; 1350 m, WP-479, Arboreal moss sifting; 3 Sept. 2014, A.S. Konstantinov (one female, MTEC).
Diagnosis: Yamuymarginatus canbeeasilydistinguished from Y. constratus by having the elytra pale yellow decorated with dark-infuscate transverse markings (Fig. 12C, D) (uniformly coloured in Y. constratus), the lateral margins of the pronotum provided with long/ complete subparallel internal carinae demarcating a wide area (Fig. 16B) (internal lateral carinae present only basally in Y. constratus), the anterior margin of the metaventrite and abdominal ventrite 1 with a pair of short postcoxal longitudinal carinae (Fig. 16D, F) (in Y. constratus anterior margin of metaventrite and abdominal ventrite 1 bordered with crenulate bordering line, without carinae), and by punctation on dorsal surface: apart from long setae present in both species, tiny short hairs are growing from simple comparatively large punctae/depressions in Y. marginatus (Fig. 16B) and in Y. constratus they are growing from conspicuous tubercles set in round punctae.
Description: Body: length 0.90–0.94 mm, 1.6 times as long as wide, 2.2 times as long as high, short oval and moderately convex (Fig. 12C, D). Coloration pale-yellow with whitish legs; elytra with dark-infuscate transverse markings on basal eighth and a large, transverse, irregularly oval one on each elytron at apical threequarters; antenna with apical three antennomeres dark infuscate (Fig. 12C, D).
Antenna nearly 0.4 of the length of the body; antennomeres 1–6 as long as wide (Fig. 13A); antennomeres 7–9 subquadrate. Apical labial palpomere short and rounded, 1.3 times as long as wide.
Pronotum 1.8 times as wide as long, 1.6 times wider at widest part than at front angles (Fig. 16B). Anterior pronotal bordering narrow and regular. Area between lateral edge and internal lateral carina weakly concave, wider at two-thirds and continuously weakly narrowing posteriorly and anteriorly; pronotal disc not concave along internal lateral carina. Base of pronotum not bordered. Posterolateral indentations comparatively deep, briefly acute. Prosternal process with apex about 0.3 of width of procoxal cavity, narrowest near half-length, distinctly widened apically, lateral carinae reaching anteriorly beyond half-length of prosternum, central area distinctly depressed (Fig. 16C).
Elytra 0.6 mm long, about as long a wide, 2.5 times as long and 1.3 times as wide as pronotum. Elytral lateral margins visible from above (Fig. 12C). Mesoventral process about as wide as mesocoxal diameter (Fig. 16D). Metaventrite with few fine setiferous punctures on sides; with small longitudinal carina near the posterior-most part of each mesocoxal cavity almost reaching mid-length of metaventrite (Fig. 16D).
Legs. Meso- and metatrochanters weakly flattened, not produced posteriorly (Fig. 16D).
Abdomen. Ventrite 1 with anterior margin with a small longitudinal carina near the internal-most margin of each metacoxal cavity reaching mid-length of ventrite (Fig. 16F). Male genital segment as in Fig. 14D.
Male genitalia (Fig. 14E). Aedeagus with penis short and stout, sclerotized, curved, weakly narrowing towards apex. Tegmen sclerotized, short ring, with long ramus extending anteriorly beyond apex of penis; tegminal strut short, reduced.
Female genitalia (Fig. 14F). Ovipositor weakly sclerotized. Spermatheca comparatively large, elongate, irregular – ‘infundibuliform’, submembranous; sperm duct of medium length, about half the length of spermatheca; accessory gland small membranous, of irregular shape. Proctiger large, narrow, weakly sclerotized.
Etymology: From the Latin, marginatus, edged, based on the characteristically bordered lateral pronotal margins that distinguish it from the other species in the genus.
Biology: One of the specimens was collected by sifting small accumulations of leaf litter and rotten palm leaves and fruits in sparse montane forest at elevation of 821 m. The second one, by sifting arboreal mosses in montane area at elevation of 1350 m.
Distribution: Puerto Rico (Fig. 20A).
description: Published as part of Arriaga-Varela, Emmanuel, Tomaszewska, Wioletta, Szawaryn, Karol, Robertson, James, Seidel, Matthias, Ślipiński, Adam & Fikáček, Martin, 2023, The resurrection of Cerasommatidiidae, an enigmatic group of coccinelloid beetles (Coleoptera: Coccinelloidea) based on molecular and morphological evidence, pp. 1078-1115 in Zoological Journal of the Linnean Society 197 (4) on pages 1107-1108, DOI: 10.1093/zoolinnean/zlac082, http://zenodo.org/record/7814127