Enhypnon costatum (Carter) Carter, 2013

Turco, Federica, Ślipiński, Adam & Lambkin, Christine L., 2013, Enhypnon Carter: a taxonomic revision of an endemic Australian genus of ground-dwelling beetles (Coleoptera: Zopheridae), Zootaxa 3681 (4), pp. 371-394 : 374-376

publication ID	https://doi.org/ 10.11646/zootaxa.3681.4.3
publication LSID	lsid:zoobank.org:pub:B9FF21C7-C95F-4164-8964-3DF63FCB19E1
DOI	https://doi.org/10.5281/zenodo.6153979
persistent identifier	https://treatment.plazi.org/id/F23087D4-8A6C-FFD7-72EF-FA34673AFE1B
treatment provided by	Plazi
scientific name	Enhypnon costatum (Carter)
status	comb. nov.

Treatment

Enhypnon costatum (Carter) comb. n.

( Figs 1 View FIGURE 1 b, 2b, 4b, 5b, 6b, 7b)

Mnionophilus costatus Carter, 1919: 143 .

Types. Holotype. Tasmania, Waratah, Lea & Carter, coll. Carter [Ga: 41.45S 145.53E] (MV, T-3870).

Notes on types. Even though the description was based on two specimens, Carter designated only one type (“ Type in Coll. Carter”). This specimen is now housed in Museum Victoria and can be identified as the original type of this species by the identification label handwritten by Carter and an old label bearing “ TYPE ” printed in red. This specimen was subsequently labeled and registered as holotype in MVMA. The second specimen discussed by Carter was not found in the MVMA and has not been located elsewhere.

Other Specimens examined. Tasmania: Cradle Mtn. Nat. Pk, Waldheim For. (3000ft), 2.ii.1977, FMHD #77 – 107, litter of Nothofagus cunninghami, J. Kethley [Ga: 41.633S 145.933E] (1, FMNH); Lower Gordon R. (42.35S 145.42E 42.34S 145.43E),. ii.1976, litter, Howard, Hill (10, ANIC); same locality,. ii.1976, moss, Howard, Hill. (3, ANIC); same locality,. i.1976, litter, Howard, Hill. (9, ANIC); same locality,. i.1976, moss, Howard, Hill. (6, ANIC); same locality,. ii.1977, litter, Howard, Hill. (2, ANIC); Mt Doris, lower slopes, low shrubland, 30. IV.1992, P. Greenslade, M. Comfort [Ga: 40.317S 148.317E] (1, ANIC); Strahan, Lea & Carter, in moss and lichens [Ga: 42.150S 145.317E] (1, SAMA); Waldheim, Cradle Mtn, 12 – 14.ii.1967, G. Monteith [Ga: 41.633S 145.933E] (4, ANIC; 4, UQIC).

Diagnosis. Among the species with low tubercles on elytra, Enhypnon costatum is distinct in having the pronotum broadly explanate with upturned and finely denticulate lateral margins ( Fig. 2 View FIGURE 2 b).

Redescription. Body length: 2.1 – 2.85 mm; body maximum width (elytra): 0.9 – 1.4 mm.

Body: small, compact and distinctly convex; colour uniformly light to dark brown; vestiture consisting of very short recumbent setae and sparse erect short setae; setation longer around antennomeres III – XI.

Head: surface coarsely sub-rugose; maximum width at eyes (0.56 – 0.75 mm), abruptly constricted behind eyes; frons weakly concave between eyes; frontal ridge weakly sinuate in frontal view, slightly thicker in front of eyes above antennal insertion; clypeus anteriorly straight, relatively narrow (ratio clypeus width/head max. width: 0.45 – 0.47), short and with obtuse lateral angles; eyes small, protruding and coarsely faceted; antenna 11-segmented with a loose and weakly developed 2-segmented club; antennomeres I – III sub-cylindrical; I thick and about 1.5 times as long as wide; II thinner and elongate, about twice as long as wide; III – V elongate and progressively shorter; VI – IX cupuliform and slightly increasing in size; X cupuliform and about 1.5 times as wide as IX; XI about as wide as X, rounded and slightly pointed. Last maxillary palpomere flat, elongate and distinctly parallel-sided (see Fig. 6 View FIGURE 6 b).

Pronotum: broadly explanate along entire length; surface coarsely sub-rugose, with two admedian slightly raised areas ( Fig. 4 View FIGURE 4 b); margins well-defined and upturned, serrate.

Leg: simple; tarsomeres not transverse.

Elytra: no apparent costae; intervals 3 and 5 with very weak sub-apical tubercles; elytral punctures wide, regular and clearly visible.

Distribution. Tasmania ( Fig. 7 View FIGURE 7 b)