rule 34 2022 4 fingers 4 toes allosaurid allosaurus animal genitalia anthro arm spikes balls blue eyes brown body brown skin claws dewclaw digitigrade dinosaur feet finger claws fingers fully sheathed genitals head crest head spikes hi res long tail male markings morrison ixer muscular muscular anthro muscular male nebelviper non mammal balls nude open mouth raised hand reptile ring marking ringtail scales scalie sheath simple background solo spiked tail spikes spikes anatomy standing tail tail markings tan body tan skin theropod toe claws toes white background 8027095