Hydraena cameroconvexa, Perkins, 2022
publication ID |
https://doi.org/ 10.11646/zootaxa.5203.1.1 |
publication LSID |
lsid:zoobank.org:pub:85C20298-5DF9-44DF-8485-3C64CF40CD08 |
DOI |
https://doi.org/10.5281/zenodo.7300278 |
persistent identifier |
https://treatment.plazi.org/id/0C081779-B90A-7853-C5B8-43BDFB62209F |
treatment provided by |
Plazi |
scientific name |
Hydraena cameroconvexa |
status |
sp. nov. |
Hydraena cameroconvexa , new species
Figs. 5 View FIGURE 5 , 32 View FIGURE 32 (habitus), 32 (aedeagus), 41 (map)
Type Material. Holotype (male): “ Cameroon: C. S. Prov., 15 km. NW Yaounde, Isali River nr. Nouma, 2.i.1983, leg. P. D. Perkins ” ( MCZ).
Differential Diagnosis. Differentiated from other members of the genus in Cameroon by the combination of the large body size (ca. 1.74 mm, largest known in Cameroon), the pronotum with sides markedly arcuate over middle 1/3, the oval, transversely quite convex elytra, the very wide P1 and P2, the plaques widely separated carinate lines, and the aedeagus ( Fig. 32 View FIGURE 32 ).
Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.74/0.79; head width 0.42; pronotum 0.42/0.58, PA 0.47, PB 0.48; elytra 1.05/0.79. Habitus as illustrated ( Fig. 32 View FIGURE 32 ). Pronotum with sides markedly arcuate over middle 1/3, sides more strongly sinuate posterior to middle than anterior to middle. Frons finely and moderately sparsely punctulate, punctures ca. 1xef, interstices ca. 1–3xpd, shining. Pronotum coarsely densely punctate in anterior and posterior 1/3, interstices ca. 1xpd, shining; disc convex, very finely very sparsely punctulate, interstices ca. 3–6xpd, shining. Punctures of clypeus very fine, sparse on disc, interstices shining, very dense, dull laterally. Labrum apicomedially excised, free margins weakly upturned. Pronotum with anterior margin emarginate over middle 1/2; anterolateral pronotal foveae deep; posterolateral and posterosubmedial pronotal foveae very shallow.
Elytra oval, transversely quite convex, posterior declivity abrupt, summit of at or very near midlength; lateral explanate margins wide; punctures coarse, on basal 1/3 punctures ca. 2xpd of largest pronotal punctures, each puncture with very short and very fine seta. Intervals not raised, width ca. 2–3xpd, as are interstices between punctures of a row. Apices in dorsal aspect conjointly rounded, in posterior aspect margins not forming angle with one another.
Venter: Mentum finely sparsely punctulate, shining. Postmentum densely micropunctulate, dull. Genae very slightly raised, shining, without posterior ridge. Ratios of P2 width and plaque shape (P2/w/l/s) ca. 1/0.2/1/1. P1 and P2 very wide. P2 l/w ca. 1/1, sides parallel, apex blunt. Plaques widely separated carinate lines, located at sides of deep median depression. AIS very wide, width at straight posterior margin ca. 1.2x P2. All tibiae slender. Protibia very slightly arcuate. Meso- and metatibiae straight. Abdominal apex asymmetrical, with deep apicomedian notch.
Distribution. Currently known only from the type locality ( Fig. 41 View FIGURES 39–41 ).
Etymology. Named in reference to the known distribution, and to the convex dorsum.
MCZ |
Museum of Comparative Zoology |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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