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Morphology of Danionella priapus
- Skull, hyopalatine arch, gill arches, and endoskeletal shoulder girdle mostly cartilaginous.
- Perichondral ossifications give skeleton overall larval appearance.
- Numerous bones and cartilages absent:
- kinethmoid (and kinethmoid cartilage)
- preethmoid
- vomer
- dermethmoid
- nasal
- parietal
- intercalar
- extrascapular
- infraorbitals 2-5
- ectopterygoid
- metapterygoid
- urohyal
- hypobranchials 1-3
- sclerotic bones
- posttemporal
- postcleithrum
- mesocoracoid
- pectoral radials 3-4 (and pectoral radial cartilages 3-4)
- pelvic radials 1-3 (and pelvic radial cartilages 2-3)
- supraneurals 2 and 5-9 (and supraneural cartilages 5-9)
- middle and distal radials in dorsal and anal fins
- epineurals
- epipleurals
- uroneural 2
- scales
- Ceratobranchial 5 heavily ossified, bearing 4–5 tri-to quadricuspid teeth plus the tips of 1 or 2 replacement teeth.
- Outer arm of os suspensorium sexually dimorphic, being enlarged and hyperossified in males and in confluence with lateral process of 2nd vertebra via anterior process and with inner arm of os suspensorium below tripus via broad median flange.
- Males with a relatively large conical nodule of cartilage between 5th rib and outer arm of suspensorium, its proximal surface approaching swimbladder wall.
