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Photo#2255581
Beetle, dorsal - Cryptorhopalum pruddeni - female

Beetle, dorsal - Cryptorhopalum pruddeni - Female
Sabinoso Wilderness, San Miguel County, New Mexico, USA
July 22, 2022
Size: 3.0 mm
Download high resolution image

This beetle was found in a flower blossom in the dry stream bed of Higgins Canyon on 22JUL2022 at 35°35'48.4"N 104°36'55.3"W, 5625 ft. elevation, in Sabinoso Wilderness in the Canon Olguin 7.5’ quadrangle, San Miguel Co., New Mexico.

Cryptorhopalum pruddeni ID and female sex are based, Beal's keys applied to the linked images, resemblance to the specimen posted by Mike Quinn, and to the image of visible abdominal sterum 5 of females in Beal 1995 (1). Words in square brackets in the following surround words which do not apply to our specimen. Parentheticals of the form "(ELR: ...)" are my own specimen-specific comments.

From key to Dermestidae genra of Beal 2003 (2) :

1' Abdomen with 5 externally visible sterna. Median ocellus present [or absent].
3' Compound eyes present. Hind legs [more or less] retractile and received into groove in coxae.
4' Dorsal surface covered with long or short hairs [or scales]. Front leg in repose not covering antenna in antennal fossa. Lateral margin of metacoxa separated from epipleuron by clearly visible section of epimeron.
5' Pronotum without sublateral carinae. Small or large beetles with [scales or suberect or] subrecumbent hair. Either somewhat flattened or strongly convex beetles.
6' Head with median ocellus [except for variety of Megatoma kaliki from northern Idaho and British Columbia]. Procoxae more or less widely separated at apices with prostemal process visibly separating procoxae (Fig. 5). Species less than 5.5 mm in length.
7' First segment of hind tarsus as long as or longer than second segment. Ventral surface of head covered by pronotum (Fig. 2). Metacoxal lamina with margins subparallel or gradually narrowed laterally (Anthrenini).
9' Vestiture of hairs, [some of which may be slightly ensiform but] never scale-like .
10 Antennal cavity [partially or] completely closed.
11 ' Antennal club composed of 2 [or more] segments; segments combined subequal to [or shorter than] preceding segments; [if club much longer than preceding segments, then club of 3 subequal, subtriangular].
12 Antennal club composed of 2 segments.
13' Antennal club [elongate or] oval in outline; penultimate segment slightly [or much longer] than ultimate segment. Species occurring [near seacoast or] inland ... Cryptorhopalum

From key to Cryptorhopalum species groups of Beal 1985 (3) :

1' Form ovate: ratio of width to length 1:1.80 or shorter (ELR: ours is 1:1.59).
2. Basal half of 1st visible abdominal sternum with 2 oblique striae extending from beneath each trochanter. Elytra with subbasal, subapical and apical bands of light colored pubescence and [sometimes with] basal band; [subapical and apical bands rarely coalesced into 1 large band with sub basal band extending across median suture. Abdominal sternum 8 of male with long lateral apophyses and without median process] ... Quadripunctatum group

From key to adult males of Quadripunctatum species group of Beal 1985 (3) :

[1 Antennal club black or dark chocolate brown, subcylindrical; ratio of width to length of club 1:2.0 or narrower. Hypomeron at narrowest point
behind fossa only 1/2 as wide as segments of funicle of antenna ... poorei
1' Antennal club light yellowish to reddish brown, subglobose; ratio of width to length 1:2.0 or wider. Hypomeron at narrowest point behind club 2/3 to 2 times as wide as segments of funicle of antenna.]

(ELR: Our antenna club has width:length of 1:2.1. The Hypomeron at narrowest point behind club is 2.5 times as wide as segments of funicle of antenna. This is inconsistent with either choice of the above couplet. It is therefore female, which have smaller clubs and, therefore, wider hypomeron behind antenna fossa.)

From key to adult females of Quadripunctatum species group of Beal 1985 (3) :

1' Maculae present on 5th visible abdominal sternum (may be large and glabrous, covered with setae and marked by fine carina around margin or small shallow, somewhat pit-like).
2' Maculae of 5th visible abdominal sternum with at least well-defined anterior margin formed either by fine, slightly raised carina or by macula being somewhat depressed. Pronotum with [or without] dark brown hairs on disc.
4 Diameter of maculae of 5th visible abdominal sternum 1/3 to 1/2 visible length of sternum at midline (ELR: Ours is 1/3).
5' Hairs of pronotal lobe and often many hairs of disc white or very pale golden white.
7' Small or large area of basal margin of pronotum on either side of lobe almost always with golden brown hairs; pronotum usually with large area of golden brown hairs on disc. Elytra without whitish hairs between submedian and subapical bands ... pruddeni

This image is from a Helicon Focus processed stack of 218 images with a 7.7 µm step taken with a Mitutoyo M Plan APO 10×/0.28 ∞/0 mm microscope objective + Nikon 135 mm F2.8 AIS telephoto lens + Nikon D810 camera (magnification 6.75×).

Images of this individual: tag all
Beetle, dorsal - Cryptorhopalum pruddeni - female Beetle, ventral - Cryptorhopalum pruddeni - female Beetle, anterior - Cryptorhopalum pruddeni - female Beetle, lateral-anterior - Cryptorhopalum pruddeni - female Beetle, ventral-posterior - Cryptorhopalum pruddeni - female