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Fig. 2 | Frontiers in Zoology

Fig. 2

From: The antennal scape organ of Scutigera coleoptrata (Myriapoda) and a new type of arthropod tip-pore sensilla integrating scolopidial components

Fig. 2

External morphology and histological anatomy of the scape organ and surrounding areas of the antennal base. A Dorsal face of the second (distal) antennomere showing the pore of the scape organ. Note the lateral and median groups of peg-shaped sensilla aligned in sickle- or chevron-like formations. Dashed area marks the two trichoid sensilla posteromedial of the scape organ. B Magnification of the pore documenting the bottom of the cavity along with six cone-shaped sensilla. C Close-up of a cone-shaped sensillum; a terminal pore is not noticeable. D Paraffin cross-section of the cavity illustrating nine cone-shaped sensilla located at the bottom and lower lateral parts. Bodian staining. E Transverse paraffin section through the dorsal face of the scape, cut at the level of the scape organ. The scape organ is underlain by a thickened epidermis comprising clusters of elongated, bottle-shaped and tightly adjoined epithelial cells. Note the lateral and median groups of peg-shaped sensilla and associated clusters of receptor and sheath cells. The antennal nerve exhibits a slight purple staining due to the effect of silver impregnation targeting neurofibrils. Bodian staining. F Longitudinal paraffin section of the scape. Note the wider opening of the cavity (as compared to E) caused by its ovoid shape and longitudinal orientation of the section. Azan staining. als, antennal lymph space; anv, antennal nerve; ca, cavity; co, sensory cone (of cone-shaped sensillum); cu, cuticle; epc, interstitial epidermal cells; fl ,flagellum; lg, lateral group of peg-shaped sensilla; mg1, medial group 1 of peg-shaped sensilla; mg2, medial group 2 of peg-shaped sensilla; rc/shclg, cluster of receptor and sheath cells of lateral group of peg-shaped sensilla; rc/shcmg1, cluster of receptor and sheath cells of first medial group of peg-shaped sensilla; rc/shcso, cluster of receptor and sheath cells of the scape organ; so, scape organ; tri, trichome; trs, trichoid sensillum; 1, first (proximal) antennomere; 2s (distal) antennomere

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