Poiana richardsonii
Poiana richardsonii (Thomson, 1845)
Common name: Central African oyan.
Synonyms: ochracea Thomas& Wroughton, 1907.
Distribution: Cameroon, Central African Republic, Congo, Democratic Republic of Congo, Equatorial Guinea (including Bioko Isl.), Gabon.
Habitat: rain forest.
Sympatric species: G. cristata, G. maculata, G. piscivora, G. poensis, G. servalina, G. "schoutedeni", G. victoriae.
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Teeth
- General aspect of the dentition : normal
- m2 : reduced (< size of m1 talonid)
- M2 : absent
- Flattening of the anterior region of the mandible : absent
- m1 talonid : reduced (only hypoconulid present; entoconid and hypoconid absent)
- P3 lingual cusp : absent or extremely reduced
Body proportion
Pads
Teats
Hair ultrastructure
- Cortex of dorsal guard hair (spatula) : thin (< 1/3 medulla width)
- Cross section shape of dorsal guard hair (base of spatula) : round or slightly ovoid
- Margin of the scales located in the middle of the spatula of dorsal guard hair : smooth
- Shape of the scales located between the base and the middle of dorsal guard hair : triangular
Coat
- Pair of wide median nuchal stripes : absent
- Coat of hindfoot : same as ground coloration
- Coat of upper leg : same as ground coloration
- Coat of inner upper leg : same as ground coloration
- Spots on upper leg : not merged
- Coat of forefoot : same as ground coloration
- Coat of upper arm : same as ground coloration
- Mid-dorsal crest : absent (similar length than adjacent dorsal hairs)
- Length of hairs on tail : short (from 20 to 30 mm)
- Tip of the tail : bright
- Chin : inferior chops uniformly bright
- Sagital (nuchal) crest : absent
- Rings on tail : present
- Dorsal spots : present
- Number of bright rings on tail (not included, if present: i) short, distal bright ring, and ii) last bright ring covered with dark) : ten ; eleven ; twelve
- Relative width of the bright rings over the dark rings (middle of tail, dorsal view) : ca. 200 %
- Shape of the first dark rings of the tail : circle
- Distal part of the tail : alternation of dark and bright rings
- "Dirty"stripe longitudinally crossing the rings of the upper part of the tail : hardly visible
- Mid-dorsal line : present
- Longitudinal coalescence of the first row of dorsal spots (contiguous to mid-dorsal line) : absent
- Density of distribution of dorsal spots : low
- Mid-dorsal line, pattern : not a continuous stripe (one row of median spots)
- Mid-dorsal line, coloration : longitudinally crossed by a brighter (ground coloration) line
Skull
- Maxillary-palatine suture position in relation to main cusp of P3 : forward
- Premaxillary-maxillary suture position in relation to cusp of P1 : forward
- Ventral inflation of the caudal entotympanic bone (ceb) : weak (similar level of inflation with ectotympanic bone)
- Staphylinal fissure : C-shaped
- Interorbital constriction : weak (superior to 1 + 0.12)
- Posterior extension of the frontal bones, from post-orbital process to post-orbital constriction : large, almost completely overlapping the dorsal part of the interorbital constriction
- Premaxillary-frontal contact : absent
- Shape of crest of insertion of temporal muscles (upper part of the parietal) : large stripe