Nesocyrtosoma impensum Doyen and Poinar, 1994

Hopp, Katie J. & Ivie, Michael A., 2009, A Revision Of The West Indian Genus Nesocyrtosoma Marcuzzi (Coleoptera: Tenebrionidae), The Coleopterists Bulletin (mo 8) 63, pp. 1-138 : 79-80

{ Nesocyrtosoma impensum Doyen and Poinar

{ Nesocyrtosoma impensum Doyen and Poinar 1994: 47–48 ; Arillo and Ortuño 2005: 23; Perez-Gelabert 2008: 115.

{Nesocyrtoma impensum Perez-Gelabert 1999: 31 [lapsus calami].

Type Material. Not seen. The amber piece which contains the holotype of { N. impensum was not available as it also includes a partial lizard which was under study at the time of this study.

Diagnosis. This species can be distinguished from all other fossil species by its larger size (9.0 mm). The description does not provide any other characters that make this species distinct from extant species, and without studying the holotype, it is impossible to provide further diagnostic characters for this species.

Description. See Doyen and Poinar (1994).

Notes. Without studying the holotype, it is impossible to redescribe this species.

{ Nesocyrtosoma minisculum Hopp and Ivie , New Species ( Figs. 254–256 )

Type Material. HOLOTYPE (sex unknown): HOLOTYPE; Nesocyrtosoma ; minisculum ; Hopp and Ivie 2009 (from WIBF, deposited NMNH).

Diagnosis. This species can be distinguished from all other fossil species by its smaller size (3.5 mm), bronze to ferrugineous color, and the anterior and posterior edges of the pronotum entirely unmargined. It most closely resembles N. productum and { N. antiquum . It can be distinguished from N. productum by the weakly produced anterior angles and roundly convex and weakly punctate interstriae and from { N. antiquum by its smaller size and having the apical five antennomeres enlarged, forming a loose, elongate club.

Description (sex unknown). 3.5 mm long, 2.0 mm wide. Small, short, ovate moderately convex ( Figs. 254, 255 ). Shining bronze; antennae, mouthparts, and tarsi tending to be the same color as the legs. Head densely punctate dorsally; punctures subequal to a single eye facet, moderately impressed. Antenna clavate, antennomeres 7–10 transverse, forming a loose club; apical antennomere subcircular; antennomeres 7–11 with stellate sensoria. Mentum not visible. Ventral portion of eye not reaching subgenal sulcus ( Fig. 9 ); postgena without distinct punctures. Dorsal surface of pronotum moderately punctate; punctures separated by 0.5–1.0 diameters. Pronotal marginal bead complete laterally, anterior and posterior edges completely lacking marginal bead; anterior angles of pronotum nearly right, weakly produced and widely rounded apically; lateral edge of pronotum evenly curved to base; pronotum evenly convex ( Fig. 254 ). Prosternal process and mesoventrite obscured by legs ( Fig. 256 ). Elytral striae deeply impressed, present as rows of small punctures with a deeply impressed line through the middle of the punctures, connecting the row of punctures; elytral interstriae roundly convex and scarcely punctate; scutellary striae 3 punctures long; scutellum triangular, normal ( Fig. 254 ). Metathoracic wing fully developed. Legs short, all but mesofemora reaching beyond edge of elytron; metatibia straight. Abdominal depressions on 4th and 5th ventrites reduced to indistinct slits ( Fig. 74 ); intercoxal process of first ventrite rounded with apical nipple ( Figs. 76 , 256 ); ventral surface densely punctate ( Fig. 256 ).

Notes. This specimen is likely a male as it has the hind tibia slightly curved at the apex, but this conclusion is not definitive as the genitalia cannot be seen.

Etymology. The species epithet comes from the Latin word minisculus, meaning rather small as this is the smallest known member of Nesocyrtosoma from Dominican amber.

Figures

Figs. 251–257. 251–253: {Nesocyrtosoma celadonum. 251) Habitus, dorsal; 252) Habitus, lateral; 253) Habitus, ventral. 254–256: {Nesocyrtosoma minisculum. 254) Habitus, dorsal; 255) Habitus, lateral; 256) Habitus, ventral. 257) {Nesocyrtosoma phthanatum, habitus, dorsal.

Figs. 5–9. 5–7: Mandible of Nesocyrtosoma hispaniolae. 5) View from back; 6) View from side; 7) View from front. 8–9: Ventral portion of eye. 8) Nesocyrtosoma lacrima with ventral portion of eye not reaching the subgenal sulcus; 9) Nesocyrtosoma darlingtoni with ventral portion of eye reaching the subgenal sulcus.

Figs. 74–76. Abdominal characters. 74) Nesocyrtosoma inflatum with abdominal depressions on 4th and 5th ventrites reduced to indistinct slits (AbS 5 abdominal slits); 75) Nesocyrtosoma otus with abdominal depressions on 4th and 5th ventrites present as impressed pits (AbP 5 abdominal pits); 76) Nesocyrtosoma skelleyi with first visible abdominal ventrite with a nipple at the apex.