- Arms
- Arms IV
- Right arms IV have 2 series of suckers in males and females.
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Figure. Oral view of right arms IV for P. microlampas (stained with methylene blue). Top - Female. Bottom - Male (note suckers begin in distal half of arm). ©
- Hectocotylus plate and associated membrane.
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Figure. Side view of the hectocotylus plate for P. microlampas. Note ridges next to hectocotylus plate. ©
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Figure. Upper left - P. gemmata toothed plates from the hectocotylus of two males from off California (redrawn from Young, 1972) and from one male from off New Zealand (redrawn from Riddell, 1985). Bottom left - P. microlampas toothed plates from two males from off New Zealand (redrawn from Riddell, 1985). Right - A cleared hectocotylus of P. microlampas from Hawaiian waters showing the toothed plate. Black dots throughout the arm tissue are artifacts. Photograph by R. Young.
- Hook cusps
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Figure. Side view of a portion of Arm II of P. microlampas, preserved and cleared, showing suckers and hooks. Note double cusps on hooks. Tiny balls are artifacts. Photograph by R. Young
- Tentacles
- Tentacle clubs with enlarged dorsal series on manus.
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Figure. Oral view of a tentacle club from P. microlampas. Note size gradation of suckers across the manus. ©
- Tentacle clubs with enlarged dorsal series on manus.
- Head
- Buccal membrane with papillae
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Figure. Oral view of the buccal membrane (and associated papillae) of P. microlampas. ©
- Buccal membrane with papillae
- Photophores
- Eye photophores - with 10 large and 4 minute organs.
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Figure. Small eye photophores of a female P. microlampas. ©
- Tentacular photophores - 4 visible from tentacle base, along stalk to base of club.
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Figure. Ventrolateral view of the head, arms and tentacles of a preserved and cleared P. microlalmpas (18 mm ML, female, off Hawaii). The white tentacular photophores are clearly visible on both tentacles. The only ocular photophore that cannot be seen is the one posterior to the lens. Photograph by R. Young.
- Pigmentation
- Arm chromatophores begin prior to arm base and extend to tips of arms.
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Figure. Aboral view of arm I, II chromatophores for P. microlampas. ©
- Mantle chromatophores
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Pterygioteuthis microlampas. ©
- Arm chromatophores begin prior to arm base and extend to tips of arms.
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