Oocyclus latiorificialis Jia & Mai 2024, sp. nov.
Creators: name: Jia, Feng-long
name: Mai, Zu-qi
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Hydrophilidae
Oocyclus
Oocyclus latiorificialis

description: Oocyclus latiorificialis sp. nov.
Figs 2 A – D, 6 E, 7 E, 8 E
Type material.
Holotype: China • ♂; Yunnan Province, Nujiang Lisu Autonomous Prefecture, Lushui County, Pianma Village, on wet rock with fine flowing water (怒江傈僳族自治州泸水市片马村流水岩壁); 26.014039 ° N, 98.650640 ° E; 2131 m elev.; 2021. V. 17; Zhuo-yin Jiang, Zhen-ming Yang & Zu-qi Mai leg.; SYSU SYSBMZ 2370018. Paratypes: 1 ♂; same data as the holotype; SYSU SYSBMZ 2370019. • 16 unsexed spec.; Yunnan Prov., Lushui County, Yaojiaping (泸水县姚家坪); 26.1 ° N, 98.71 ° E; 2424 m elev.; 2016. V. 17; Yu-dan Tang & Rui-juan Zhang leg.; SYSU SYSBMZ 2370020 to 0035.
Diagnosis.
Body medium-sized, length 4.1–4.3 mm, oval, and rather convex. Dorsum black, with distinct greenish luster under lateral illumination, slightly iridescent. Head, pronotum, and elytra with dense ground punctures consisting of extremely fine and moderately coarse punctures. Systematic punctures on labrum moderately dense, forming a nearly continuous transverse row. Posterolateral corners of pronotum evenly rounded. Elytral suture not raised; without distinct rows of systematic punctures; lateral margins of elytra not expanded outwards. Pseudepipleura narrowed posteriorly. Procoxae without distinct, spine-like setae in fine pubescence. Meso- and metafemora with fine microsculpture on intervals of punctures. Abdominal ventrites with uniform pubescence over entire surface. Aedeagus (Fig. 2 D) with parameres almost as long as median lobe; inner margin of paramere sinuate in dorsal view and distinctly, subapically curved inward; apex of paramere broadly rounded. Median lobe parallel-sided medially, slightly widened at site of gonopore; gonopore situated apically; anterior margin of gonopore pointed.
Description.
Form and color (Fig. 2 A – C). Length 4.1–4.4 mm width 2.4–2.7 mm, oval, rather convex; elytra longer than wide. Dorsum black, with distinct greenish luster under lateral illumination, slightly iridescent, more vividly colored when alive. Maxillary palps yellow, with apex black; labial palpi yellow. Mentum and stipes light to reddish brown, paler than ventral face of head. Legs, epipleura, lateral margins of prosternum, and posterior margin of each ventrite light brown to dark reddish brown, with remainder of venter darker reddish brown. Head. Labrum, clypeus, and frons with both extremely fine and moderately coarse ground punctures, distance between punctures 0.5–4.0 × as the width of 1 puncture. Systematic punctures on labrum moderately dense, forming a nearly continuous transverse row, with moderately long setae. Frons with an irregular row of systematic punctures mesad of each eye, bearing fine erect setae. Clypeus with a few very indistinct systematic punctures along anterolateral margins, slightly larger than surrounding ground punctures and bearing short setae. Antennae with scape subequal in length to antennomeres 2–5 combined; first two antennomeres of club subequal in length, and apical antennomere slightly longer than two preceding antennomeres combined. Maxillary palps short, subequal in length to the width of labrum; palpomere 2 slightly dilated, apical palpomere ca 1.3 as long as penultimate. Labial palpi ca 3 / 4 width of mentum. Mentum quadrate, anterior margin slightly convex, bearing very fine and scattered punctures. Thorax. Ground punctation on pronotum and elytra composed of extremely fine and moderately coarse punctures evenly mixed and distributed. Pronotal systematic punctures present, ca 1.5–2.0 × size of ground punctation and set with a fine seta, sometimes partially blending with coarser ground punctures; anterior and posterior series each forming an irregular row. Lateral margins of pronotum set with a few sparsely distributed setiferous punctures. Pronotum with anterior and lateral marginal rims, posterior marginal rim absent. Posterolateral corners of pronotum evenly rounded. Prosternum moderately tectiform, with median carina along entire length but without distinct anteromedial tooth. Elytra without distinct rows of larger punctures, systematic punctures almost as coarse as coarser ground punctures, distinguished by the presence of fine, short setae; lateral margins of elytra not expanded outwards; elytra suture not raised. Pseudepipleura narrowed posteriorly. Mesoventral process with lateral extensions sloping evenly downward. Metaventrite posteromedially with an oval glabrous area, slightly longer than wide, length of glabrous area about 2 / 3 of the total length of metaventrite. Pro- and mesocoxae densely pubescent, without distinct spine-like setae. Ventral surface of profemora densely pubescent at basal 1 / 5, remainder scattered with fine punctures, interstices with fine microsculpture; meso- and metafemora glabrous, with coarse punctures and fine microsculpture. Protibiae with several spines on dorsal face. Fifth tarsomere of pro- and mesotarsus subequal in length to the preceding 4 tarsomeres combined. Fifth metatarsomere equal in length to second tarsomere. Abdomen. Abdominal ventrites 1–5 with uniform pubescence, longest setae about as long as the setae around the metaventral glabrous area. Fifth ventrite entire. Aedeagus (Fig. 2 D). Phallobase parallel-sided to slightly arcuate at basal half, manubrium gradually narrowed at posterior 1 / 2 of phallobase and rounded posteriorly. Parameres slightly longer than phallobase, widest at the base and gradually narrowed, inner margin of paramere sinuate in dorsal view and distinctly curved subapically; apices broadly rounded. Median lobe almost as long as parameres, parallel-sided medially, and slightly widened at site of gonopore; gonopore triangular, situated apically, and with pointed anterior margin.
Remarks.
This species is very similar to O. bhutanicus Satô, 1979, but can be easily distinguished by meso- and metafemora with fine microsculpture on intervals of punctures (vs lacking microsculpture in O. bhutanicus), aedeagus with median lobe as long as parameres and almost parallel-sided medially, slightly widened at level of gonopore (vs median lobe shorter than parameres and gradually narrowed from base to apex in O. bhutanicus), anterior margin of gonopore pointed (vs rounded in O. bhutanicus), and inner margin of paramere sinuate in dorsal view and distinctly curved subapically (vs inner margin of paramere almost straight in dorsal view in O. bhutanicus). This species also shares diagnostic features with O. ximaensis sp. nov., but it can be distinguished from the latter by dorsum with distinct greenish luster under lateral illumination (vs greenish luster weaker in O. ximaensis), meso- and metafemora with fine microsculpture (lacking microsculpture in O. ximaensis), and aedeagus with median lobe almost parallel-sided medially, slightly widened at level of gonopore (vs median lobe gradually narrowed from base to apex in O. ximaensis).
Etymology.
Species name is combination of Latin latus, “ wide ”, and orificialis, “ orifice ”, referring to the widely open gonopore.
Biology.
This species was founding living on wet rock surface at the margins of a waterfall.
Distribution.
(Fig. 9) China (Yunnan). Only known from type locality.
description: Published as part of Jia, Feng-long & Mai, Zu-qi, 2024, Three new species of Oocyclus Sharp, 1882, with additional records from China (Coleoptera, Hydrophilidae, Laccobiini), pp. 17-38 in ZooKeys 1205 on pages 17-38, DOI: 10.3897/zookeys.1205.123579