Sivis odpo, Vršanský, 2009

Vršanský, Peter, 2009, Albian cockroaches (Insecta, Blattida) from French amber of Archingeay, Geodiversitas 31 (1), pp. 73-98 : 86-87

Sivis odpo n. sp. ( Figs 6 ; 8 -10; 16C)

TYPE MATERIAL. — Holotype specimen ARC-89.2, a complete?2nd instar larva. Paratype specimen ARC- 037b2, a complete?2nd instar immature.

TYPE LOCALITY. — Archingeay-Les Nouillers, Charente- Maritime, SW France.

STRATIGRAPHIC HORIZON. — Lower Cretaceous, uppermost Albian, lithological subunit A1sl2 sensu Néraudeau et al. (2002).

ETYMOLOGY. — After odporučenie (Slavic for recommendation).

DESCRIPTION

Specimen ARC-89.2 ( Fig. 16C )

Head globular (0.7/ 0.64 mm), eyes strongly cut around the antennal articulation and projected beyond the head outline. Mandible very long, with at least six small sharp teeth. Antenna long, with segments very wide, third segment the largest (0.16/ 0.07 mm). Segments 4-7 with one set of 7 or 8 sensilla chaetica, segments 8 and 9 with two sets, and apical segment with three sets of sensilla chaetica.

Maxillary palp four- or five-segmented (?/0.15/ 0.11/0.16/ 0.2 mm), apical segment very wide (0.13 mm), cup-like.

Pronotum almost quadrate in outline (0.75/ 0.55 mm), meso- and metanotum very wide (0.86 mm; 0.91 mm). Marginal setae (10 on pro-, meso-, and metanotal posterior margin) very long (up to 0.12 mm). Overall length 1.9 mm.

Cockroaches ( Insecta, Blattida ) from Mesozoic French amber

ARC-037b2 ( Figs 7 -9)

Head width 0.84 mm; pronotum (1.05/ 0.68 mm), meso- and metanotum wide (1.21 mm; 1.32 mm). Cercus 0.58 mm long. Overall length 2.32 mm.

REMARKS

The holotype is preliminary categorized into the second instar, because the head is projected beyond the pronotum outline only in the first two instars, and the head is partially concealed by pronotum – a state common in the second instar. Specimen ARC-037b2 is an older, apparently the next, third instar. The proportion of the holotype, multiplied by 1.4 (Dyar’s rule) roughly fit the above presumption.

Figures

FIG. 6. — An immature of Sivis odpo n. gen., n. sp. (Mesoblattinidae), holotype ARC-89.2: A, general habitus in dorsal view; B, detail of head. Length of the specimen 1.9 mm; head width 0.64 mm.

FIG. 8. — Specimen ARC-037b1, phase contrast microradiography showing immature Blattulidae Batola nikolai n. gen., n. sp. (Sivis odpo n. gen., n. sp. is not visible here). Length of the specimen 5.6 mm (courtesy of M. Lak and P. Tafforeau, ESRF Grenoble).

FIG. 16. — A, immature of Globula lake n. gen., n. sp. (Blattulidae), specimen ARC-60, dorsal view of complete specimen; B, immature of Batola nikolai n. gen., n. sp. (Blattulidae), ventral view of terminalia; C, immature of Sivis odpo n. gen., n. sp. (Mesoblattinidae), holotype ARC-89.2, dorsal view of complete specimen; D, leg of Globula lake n. gen., n. sp., specimen ARC-263.14; E, leg of B. nikolai n. gen., n. sp., specimen ARC-138; F, unidentified legs of Caloblattinidae, specimen ARC-152.3; G, H, leg of B. nikolai n. gen., n. sp., specimen ARC 57.2.

FIG. 7. — A, B, Batola nikolai n. gen., n. sp., ventral and dorsal views of the hind leg, ARC-57.2 (length of tibia 1,6 mm); C, hind leg of Globula lake n. gen., n. sp., ARC-263.14 (length of tibia 1,7 mm); D, undetermined Caloblattinidae, ARC-152.3 (length of tibia 2,3 mm).