Pleuroceratos tertius, Háva, 2023

Pleuroceratos tertius sp. nov.

( Fig. 1 -5)

ZooBank:http://zoobank.org/ FBEABC60-14C0-4011-B44A-7760597F637E

Holotype, (sex unknown), Myanmar, Hukawng Valley , lowermost Cenomanian, ( JHAC).

Description of the holotype.

Body. – Elongate, more or less parallel-sided, dorsoventrally compressed

( Fig. 1). Body length 2.4 mm from anterior part of pronotum to abdominal apex (in position in inclusion). Dorsum deeply punctate, glabrous. Body chestnut brown, appendages dark brown.

Head. – 0.6mm long (inposition in inclusion),approximately as long as wide, slightly declined. Dorsum of head distinctly carinate. One pair of adocular costae reaching to the posteriorthirdof theeyesandwithapicalportions bentmediallyat a right angle, each costa approximately the same height throughout, forming a triangular spine. – Gular sutures and antennal grooves not visible. – Mandibles elongate, lacking a mola, tridentate apically ( Fig. 2). – Eyes ovoid, strongly protruding, without interfacetal setae. – Antennae 11-segmented, moderately long, reaching to the fourth lateral costa anteriorly, with a loose symmetrical three-antennomered club ( Fig. 3); antennomeres 9-11 forming a loose club with the apical portion of the ultimate segment subtriangular.Antennomeres mostly glabrous, segments 4-11 with a group of elongate apical setae.

Pronotum. – Transverse, 0.7 mm long, approximately parallel-sided with lateral projections, base distinctly narrower than elytral base ( Fig. 4). Pronotal surface densely punctate, irregularly arranged punctures deep and circular, separated by at most one time their diameter. Anterior and posterior margins of pronotum approximately straight. Lateral margins distinctly dentate with seven subequally spaced projections. Pronotal disc with three non-dentate carinae (one short, two long) and two dentate carinae, each carina with three projections ( Fig. 4).

Ventralsurface. – Prosternum not visible. – Procoxal process complete, parallel-sided, gradually narrowing posteriorly, with lateral carinae. – Procoxae moderately transverse and externally open, separated by slightly less than the procoxal diameter. – Metepisterna narrow. – Mesocoxal cavities rounded. – Metacoxae narrowly separated.– Abdominal intercoxal process rounded.

Legs. – Long and slender. – Trochantins partly exposed. – Trochanters elongate. – Femora widened medially.– Tibiae with two thin spurs apically and a comb of spines or strong setae, reaching to approximately half of the basal tarsomere. – Tarsi five-segmented, simple, lacking lobes. Basal four segments densely setose ventrally, apical tarsomere with rows of sparse setae. – Claws simple.

Differential diagnosis. – The new species differs from Pleuroceratos burmiticus and P. jiewenae by the structure of the antennae and the pronotal carinae.

Etymology. – The species epithet refers to the fact that this is the third known species in the genus.

Reviewers:

Vladimir Novák ( Czech Republic) - http://zoobank.org/ D5C7B806-1C9E-4C99-944A-13A71EE01B79 - https://orcid.org/0000-0001-9287-2014

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